Abstract:Technological innovation and development is the core， soul and first driving force of geological drilling engineering. This paper summarizes the science and technology innovation achievements in geological drilling engineering field， deeply understands the new requirements， systematically controls the base， prospects the overall plan， the development goal and the main tasks， in order to further implements the national innovation development strategy and promotes the geological science and technology innovation ability.

Abstract:Mine emergency rescue team is an important part of professional emergency rescue force in China， and plays an important role in reducing the harm of mine accidents. The National Dadi Special Exloration Team is one of the representative teams of mine emergency rescue force in China. Taking the national geological prospecting team as an example， this paper analyzes the current situation it faces， and puts forward countermeasures and measures to strengthen the capacity construction in accordance with the needs of mine emergency rescue in China.

Abstract:Superhard materials play an important role in the industrial development， especially in the geological drilling industry， the development and application of superhard materials are more prominent. In the past， the drilling industry has a word saying that the kind of abrasive results in the kind of drilling equipment and craft， which fully explained their causal relationship. As the promotion of the variety， structure， performance， quality of the artificial diamond， the diamond bit has met the needs of geological drilling industry to a large extent， and rapidly promoted the development of drilling industry. In the meantime， the new requirements from drilling applications continue to accelerate further exploration in the superhard industry. In other words， they complement each other， promote each other and develop together. This paper describes the characteristics， types and properties of superhard products used in geological drilling industry according to large numbers of examples. The authors sincerely expect that the superhard materials will be more refined and updated in the future， and more innovation breakthroughs will be achieved.

Abstract:This paper comprehensively summarizes the important achievements made by the Center for Hydrogeology and Environmental Geology Survey， CGS （CHEGS） on hydrogeological， engineering geological and environmental geological drilling technology and equipment， sand control technology for natural gas hydrate as well as hot dry rock drilling， etc. during the “13th Five-Year Plan” period. These achievements mainly include innovations in hydrogeological， engineering geological and environmental geological exploration technology and equipment which has helped green groundwater survey； proposal of sand control measures which has provided technical support for the experimental production of natural gas hydrate； organization and implementation of the experimental investigation and development project for hot dry rock in Gonghe Basin， Qinghai where significant breakthroughs have been made on drilling technology， equipment and process for the high temperature hard rock in order to establish a world-class demonstration power generation base. Moreover， with analysis of the existing challenges， this paper presents an outlook on the future research activities about drilling technology in the coming “14th Five-Year Plan” period.

Abstract:Over 60 years of development， underground drilling equipment for coal mines has been developed in multiple sizes and series which meet the requirements of various purposes and various drilling hole depth. However， the existing proven drilling equipment mainly runs with full hydraulic drive and manual operation. With the great investment in the intelligent construction by China’s coal mining enterprises， the traditional full hydraulic drive underground drilling equipment can not meet the current needs of intelligent development of coal mines. In regard to the construction characteristics of underground drilling， this paper analyzes the technical status and functional characteristics of typical underground drilling equipment abroad， as well as the existing problems， with focus on the progress of domestic underground drilling equipment with different construction requirements in terms of intelligence， and introduces the conventional automatic drilling machine， drilling robot， high-power automatic directional drilling machine. The key problems to be solved in the intelligent construction of underground drilling equipment in China are put forward， and the intelligent level of underground drilling equipment in coal mines is accelerated through the distributed implementation mode.

Abstract:In the field of pile foundation， with ever demanding quality control requirements for the bearing capacity of pile foundation and the verticality of pile hole in infrastructure construction， the existing conventional pile foundation hole boring monitoring technology cannot meet the requirements； it is also true with drilling of deep wells， ultra deep wells， scientific exploration wells and horizontal wells due to the deviation of the actual drilling trajectory from the design trajectory caused by formation factors and drilling processes. As a result， deviation monitoring becomes more and more strict， and the existing instruments cannot meet the requirements for high-precision drilling trajectory measurement. In view of the above problems， this paper sorts out the development status of inclination measurement-while-drilling technology， and in reference to the characteristics of geological core drilling and rotary pile hole drilling technology， puts forward a high-precision real-time monitoring scheme for the wire-line coring drilling trajectory and for the verticality of large-diameter and long bored pile holes. The promotion of this scheme will positively guide the construction operation and ensure the overall quality of the drilling / pile hole.

Abstract:Xi’an Mineral Resources Research Center actively explores and practices green geological exploration work technical methods for solid mineral geological survey（exploration） projects underway， and adopts specific measures such as applying full hydraulic crawler drilling rig and portable modular drilling rig to implement “ulti-holes from one site”， utilizing the backpack drill to implement “drilling instead of trenching” in accordance with local conditions， selecting environment-friendly drilling fluid， purifying and treating waste mud， and controlling temporary land occupation. Compared with the traditional drilling site size， the land footing area has been reduced by 80% to 85%， the construction of temporary access roads has been reduced by 60% to 65%， and the reclamation for farm land and green has reached more than 80%. Analysis of the cost of green exploration shows that the total cost of labour， the compensation for temporary land （green crop）， green environmental protection materials and restoration and greening has been reduced by about 40%. Finally， the support measures for green survey work are explored and practiced with suggestions put forward for the next step of green exploration work， which provides positive guidance for strengthening the concept of green exploration work， improving relevant systems and regulations， and stimulating the vitality of green exploration work.

Abstract:In view of the problems of complex geological exploration coring conditions， large drilling depth， high accident rate， complex lithology， difficulty in obtaining drilling parameters， and inability to know drilling status in real time， with full investigation of existing working condition identification technologies in terms of collection principle， functional types and field measurement， a scheme for real-time measurement of drilling parameters is designed by the methodology of combining hardware and software in reference to the development direction of intelligent and automatic drilling. In this paper， the density clustering method of DBSCAN （clustering algorithm based on distribution density for noise space） is proposed for the first time to analyze drilling parameters， and to determine working conditions jointly with the positive and negative increment of the photoelectric encoder， so as to obtain the bit position and drilling depth. This scheme can distinguish drilling state， obtain drilling process parameters， and invert the formation with the measured data as drillable parameters of the drilled formation. Research on automatic and intelligent drilling rig can obtain a large amount of formation data， which is beneficial to promote the development of drilling technology and realize the breakthrough from experience drilling to intelligent drilling. At the same time， it lays a foundation for the intelligent drilling system.

Abstract:The method of obtaining and characterizing heterogeneous formation parameters is an important basis for the reconstruction of shallow geological bodies. Geological modeling based on heterogeneous formation is intended to characterize the apparent parameters and physical and mechanical parameters of the soil with stochastic uncertainties and fuzzy uncertainties. The Weibull distribution is used to describe the local stratum information， and the Diamond-Square fractal interpolation algorithm， combined with calculation of the fractal dimension of the heterogeneous formation by the differential box-counting， is applied to calculate the overall stratum parameters. The PFC3D numerical simulation software， combined with data sampling by the Markov chain Monte Carlo method， is used to model the rock particles and soil particles in the heterogeneous formation. The simulation results of the heterogeneous formation indicate that its failure process and stress-strain curve are much more complicated than those of the homogeneous formation since the content and distribution characteristics of large rock particles have a significant impact on the mechanical properties of the soil. The modeling method in this paper is helpful to the study on heterogeneous formation parameter characterization.

Abstract:In deep geological drilling， complex downhole conditions raises demanding requirements on drilling performance and reliability of drilling tools. Wear-resistant and corrosion-resistant amorphous coating on the surface of drilling tool steel can effectively improve its service life. Among them， Fe based amorphous alloy coating has important application value and good economic benefits because of its excellent corrosion resistance and wear resistance， strong amorphous formation ability and other advantages. An amorphous alloy coating composed of Fe₄₈Cr₁₅Mo₁₄C₁₅B₆Y₂ （at.%） was prepared on the 35CrMo substrate by air plasma spraying （APS） technology， and subjected to vacuum heat treatment at different temperatures. The effects of heat treatment at different temperatures on the basic properties and wear failure mechanism of the coatings were investigated. The results showed that vacuum heat treatment produced a large amount of hard phase and homogenized the composition； thus， improving the wear resistance of the coating. With the increase of heat treatment temperature， the coating wear rate decreases gradually. Compared with the coating either without heat treatment or with 750℃ heat treatment， the coating with heat treatment at 850℃ had the best wear resistance， and the wear rate was only 16.7% of that of Fe based amorphous coating without heat treatment. Failure mechanisms of the coatings either with or without heat treatment all include adhesion wear， abrasive wear， fatigue wear and oxidation wear.

Abstract:Related research at home and abroad have shown coaxial contra-rotary drilling can effectively reduce drilling tool vibration and improve the rock breaking efficiency. There are few researches on the improvement level of drilling efficiency of coaxial contra-rotary drilling compared with traditional drilling. In view of the above， the finite element model of interaction between coaxial contra-rotary bit and rock is established and the finite element model of interaction between conventional bit and rock is established. The rock breaking efficiency of the two kinds of drill bits is compared quantitatively with rock breaking specific work as evaluation index. The orthogonal experiment is designed by defining five core parameters， the size difference between the inner and outer wall of the coaxial contra-rotary bit， the gap between the inner and outer wall of the coaxial contra-rotary bit， the ratio of the inner and outer wall thickness to the size difference between the inner and outer wall of the coaxial contra-rotary bit， the rotating ratio of the inner bit and outter bit and the bottom height difference of the inner and outer bit. The simulation analysis is completed according to the orthogonal experiment. The result show that the height difference between the internal and external bit and the internal and external bit clearance have little influence on the rock breaking specific work， while the size difference between the inner and outter bit， the rotating ratio of the inner and outter bit and the ratio of the wall thickness of the inner bit to the size difference between the inner and outer wall of the coaxial contra-rotary bit have significant influence on the rock breaking specific work.

Abstract:In order to improve the road performance of ordinary emulsified asphalt mixture， a new kind of composite material， waterborne epoxy emulsified asphalt， was obtained by organically combining emulsified asphalt and waterborne epoxy resin. The effects of the amount of waterborne epoxy resin on the mechanical strength， water stability and temperature stability of the mixture were studied by experiments. The results showed that the initial strength， late strength and high temperature stability of the mixture increased with the increase of the amount of water-based epoxy resin， but the water stability and low temperature stability increased first and then decreased with the increase of the amount of water-based epoxy resin. The best improvement effect was achieved when the amount of water-based epoxy resin was 10%and 15%，respectively. In practical engineering application， the dosage of waterborne epoxy resin is controlled between 10%and 15%.

Abstract:The production data is an important driving force to promote the development of the drilling industry， and it is also the basis for the future application of artificial intelligence in the drilling industry. At present， all the drilling industry giants， either domestic or abroad， have begun to establish production data collection and analysis platforms. But the data integration and analysis for ordinary drilling production operations have still not attracted attention. The proposed paper takes 21912 data collected from 10 wells in a certain area of the South China Sea with 44 different parameters as an example to show the whole analyze process using production data， which from collection to quantitative analysis. The matrix integration of data in different formats can be realized from the image point sampling algorithm and data complementation algorithm. According to standardization and visualization processing， qualitative analysis of integrated data can be completed， and the law and trend of production data can be clarified. Based on the statistical analysis， correlation analysis and factor analysis， the data characteristic values can be obtained， meanwhile the interrelationship between different parameters can be clarified. Realizing the parameters grouping and dimensionality reduction， the accuracy of further data modelling can be ensured with the reduced modeling complexity.

Abstract:In the drilling operations over past years， conventional washover milling has been used to deal with bit burial due to the formation or a long time treatment of bit burning or sticking. This method is labor-intensive and consumes materials such as male cones with low success rate， even scrapping of the borehole. This paper introduces use of the extra-long washover mill to deal with down-shole accidents such as bit burial in uranium drilling in Ordes Basin. It can greatly shorten the treatment time of the accident， reduce the labor intensity， improve the intrinsic safety of the drill， and reduce the abandonment rate of holes. It provides a fast and safe method for dealing with down hole accidents in future drilling operations.

Abstract:As the Sijiaying iron ore rock has the characteristics of complete structure and of high rock drillability， medium-deep hole core drilling works and control the out-of-tolerance of drilling bending belong to the drilling technical problems and also the key to ensure the drilling quality. Since 2009 about 30 medium-deep holes has been constructed， two-thirds of them have been downgraded because of severe out-of-tolerance of the well deviation which confused the geologist as well as the drillers. In the process of drilling， some borehole accidents occurred， and deflected by screw drilling and eccentric wedge were failed to solve the problems. The formation rock is complete and hard， and the drilling deviation correction and building can not be realized， as a result， the severe out-of-tolerance of borehole bending in medium-deep holes has become an urgent technical problem which seriously affect the realization of the goal of "exploring the deep and blind area". In 2018， the design of drilling depth was 1500m， conventional drilling anti-inclination technique measures were adopted in order to ensure the drilling quality. What’s more， S75mm half-cycle self-correcting anti-bending drilling tool （XBZX） was tested， and achieved success to some extent compared to the construction in 2015， which provided technical support to solve the severe technical problem of bending out-of-tolerance drilling in medium-deep hole of Si-jiaying Iron Mine， and also provided practical experience and construction technology to prevent bending out-of-tolerance drilling in medium-deep hole of the same type of mining area.

Abstract:The Shenjiayao-Huluyu gold mining area in Shan county， Henan province， is a national forest reserve. For drilling in this area， it is necessary to avoid complex zones and green areas， and green exploration must be carried out to reduce damage to the forest environment； thus， most holes are designed at slant holes. however， due to the large angle of stratum penetration and a large number of weak interlayers， the borehole curvature is not easy to control， resulting in abandonment of the early drilled boreholes because of over-standard curvature. Taking ZKS004 borehole as an example， this paper introduces in detail the borehole drilling technology， the control and prevention of borehole curvature and the measures of deviation correction.

Abstract:The project“The Deep Geothermal Resources Survey in Wendeng Rongcheng Weihai Area of Shandong Province” is one of the 38 provincial-level geological exploration projects of Shandong Province for 2018， and its overall goal is to provide channels and specific physical data for geothermal geological survey， borehole temperature measurement， core thermophysical properties and radioactive element content testing by drilling a 3000 m temperature measurement borehole with wireline core drilling technology. In reference to the 3000 m-deep small diameter geothermal drilling project， this paper systematically introduces the drilling structure， Drilling equipment， and key drilling technology. with focus on the experimental comparison and analysis of mud technology and deep hole drill bit technology for severe fractured zones， and high stress and complex formation conditions. The relevant technical measures were adopted to solve the down hole complex problems and the long service life and high efficient bits were developed to improve the drilling efficiency and reduce the cost. The paper also discusses the management method of "site standardization and green construction" for deep hole geothermal drilling.

Abstract:Most of the transmission line tower position in mountainous areas have high mountains，steep slopes，developed vegetation and lack of water，leading to the relocation of drilling equipment difficult， inconvenient water，which seriously affect the work of geological drilling.This paper focuses on the needs of geological survey of transmission lines in mountainous areas，carries out systematic and integrated research based on shallow drilling technology， introduces small diameter （?46 mm） wire line coring technology，develops new efficient polycrystalline diamond composite drill bit， optimizes drilling lifting device， circulation system，drilling fluid formula，etc.，and has been verified in the test.The results show that the waterless drilling technology is suitable for the geological survey of transmission lines in mountainous areas. The shallow drilling wire line coring technology can effectively solve the problems of hole wall collapse and low drilling efficiency. The upgraded drilling rig circulation system can carry out drilling fluid circulation drilling. By optimizing the drilling fluid formula，the coring rate can be increased to more than 85%.Solving the problems of low efficiency and low heart rate in geological drilling of power transmission lines in mountainous areas.

Abstract:The No. 103-1 hydrogeological borehole in Wangwa Coalmine happend a sand jamming accident in the drilling operation. In the process of dealing with the subsequent jamming accident， the casing milling barrel was also jammed in the borehole， and the casing milling barrel broke immediately after being pulled out. The fracture was not even and tilted to the edge， which formed a very complex accident in the borehole.First of all， there was too much sand in the mud. Second， the diameter of the surface casing was too small when the drill collar stuck， which made it difficult to deal with the accident.According to the characteristics of the accident in the hole， this paper introduces the treatment scheme of pulling out the surface casing first， replacing the large diameter surface casing， and then setting back the milling barrel and drill collar.In addition， the active drilling pipe， drill bit， extended casing milling barrel， and centralizing tool for casing milling accident were specially designed and processed， which could deal with the complicated stuck pipe accident successfully in time.This paper discusses in detail the processing process and measures of drilling accidents， summarizes the lessons and experience of the accident， which has a guiding and reference significance for dealing with similar stuck drilling accidents.

Abstract:Wulashan Daqingshan in Inner Mongolia is an important gold metallogenic belt in North China. More than 100 gold veins have been found in Hadamengou area， Inner Mongolia， and the accumulated gold reserves are more than 100 tons. It is an important gold concentration area in the western part of the northern margin of the North China Craton. Affected by the geological background of strong tectonic movement， the strata conditions in the area are complex， leading to some problems such as leaking， shrinking， collapsing and block falling. All these conditions not only affect the drilling progress， but also create waste holes if not properly handled. In view of this， these paper summarizes a drilling technical method of cement sealing of large fracture stratum+increasing drilling fluid dosage ratio in middle fracture stratum+steady speed and prevention in minute fissure+large dosage ratio of drilling fluid and speeding through the shrinking stratum. In addition， these method has achieved good results in 100ZK5916 project.

Abstract:Alluvial-proluvial gravel is the main formation of geotechnical investigation in Xinjiang. With description of alluvial-proluvial gravel drilling technology over the past three-decade, the key technical points of various drilling processes are summarized, and the advantages and disadvantages of the drilling process are reviewed. Particularly, analysis and comparison of gravel drilling processes is conducted in the market competition environment with the development direction of drilling technology put forward.

Abstract:Well Wanbodi-1 was an oil and gas survey well deployed in Qiaocheng district， Bozhou city， Anhui province. The purpose of this well was to find out the stratigraphic sequence and development characteristics in Bozhou district， Anhui province by drilling， logging and testing methods， and to obtain the evaluation parameters of Cambrian reservoir physical properties， and oil and gas properties. The geology， drilling technology and problems encountered in well drilling are introduced in detail with the specific solutions put forward. The successful completion of the drilling work can provide experience and reference for drilling of similar small-diameter geological survey wells in China.

Abstract:In view of the complex formation of ZK2401 borehole in Tanjiachong mining area of Stannary in Lengshuijiang City, the drilling construction of every single borehole is carried out as a system engineering, and the controllable part is controlled reasonably and effectively, so as to be prepared to move and improve the rate of borehole formation. This paper summarizes the drilling construction methods from four aspects: preliminary investigation, drilling structure design and drilling equipment selection, drilling engineering design and actual construction situation, in order to ensure the smooth deep hole drilling of small diameter in complex strata of mining area, and the experience can be used as reference for peers.

Abstract:In relation to the field case of the intersection well set of Well 403 - 404 by Jiu-er Salt Industry， description is made of the geological conditions at the well site and drilling operations with the advantages of large diameter centering tools， the PDM directional drilling process and the technical difficulties resolved.

Abstract:At present， the depth of sedimentary rock geothermal drilling using air down-the-hole hammer technology is mostly about 1000m. The greater the formation depth， the more difficult it is to drill with air down-the-hole hammer. A geothermal well in Kangping， Liaoning Province， was drilled using air down-the-hole hammer technology to achieve a breakthrough in the depth of geothermal wells in sedimentary rocks， with a drilling depth of 2250m. Air drilling technology is adopted for the construction of the whole well， and proper working air pressure and air volume are selected to promote the popularization and application of this technology in deep geothermal wells in sedimentary rocks.

Abstract:Coalbed methane is an unconventional natural gas resource. Traditionally it is extracted by surface drilled vertical wells through water drainage and depressurizing， but this method has low output and poor economic benefit. The intersected well set is a kind drilling technology for coalbed methane mining， which is composed of a vertical target well and an intercept horizontal well. The horizontal well can be connected with the vertical well inside the coal seam ，or in the roof or bottom of the coal seam； while at present， most horizontal wells are drilled inside the coal seam. Coalbed methane horizontal wells are a kind of technology which is not very expensive but can increase production effectively. It has been used more and more in coalbed methane mining. This paper introduces drilling technology for the horizontal section of the intercept well in structural coal where the coal seam structure has formed local structural stratification， such as broken coal， broken coal， chlamy coal， and the stability of the coal seam is poor. The successful completion of the intersected well set under this geological condition is of great significance to further enrich the development technology for coalbed methane and to promote the overall development of high-，medium- and low-rank coalbed methane.

Abstract:In recent years， with the national emphasis on mine safety， vocational health， environmental protection and other aspects， large diameter boreholes have been widely used for gas drainage， water cut-off grouting， supply of nitrogen gas for extinguishing， supply of ice for cooling， drainage and ventilation， emergency rescue， etc. in mines. The large diameter boreholes range from ?500 mm to 1500 mm in diameter with depth less than 1000m. Proper selection and design of the borehole structure and the drilling method can minimize construction cost， and improve drilling efficiency and drilling safety.

Abstract:Soft broken coal seams are widely distributed in coalmines in China， with the characteristics of high gas content， high pressure， and low permeability. because of the problems such as blowout， hole collapse， difficulty in removal of cuttings， it is difficult to drill in soft broken coal seams and hole accidents happen frequently， with the drilling depth and hole completion rate compromised， leading to blind gas treatment areas. Especially with the increase of coal mining depth， the workload and drilling difficulty in soft broken coal seam continue to increase. In response to the construction requirements for gas extraction drilling in soft brokencoal seams， practical and economical high-speed technologies have been developed， such as high-speed auger drilling technology， medium-pressure air drilling technology， air directional drilling technology， which has solved the problems about removal of cuttings and hole protection， trajectory control and efficient drilling， achieving the long-term utilization of the soft broken coal seam boreholes in the service life. The technology has been successfully promoted and applied in Anhui， Guizhou， Shanxi and other regions， achieved the purpose of high-efficiency and precise extraction， which provides technical guarantee for safe production in mines.

Abstract:The surface regional treatment technology has a remarkable effect on the water disaster control in Huainan mining area. The water disaster control of the target layer is the premise of pushing forward the mining face， in addition， the fast construction of horizontal branch hole is the key to the implementation of regional governance. This article statistically analyzed four kinds of drilling efficiency index of comprehensive regional governance in Zhangji coal mine including drilling efficiency of horizontal branch hole， production drilling efficiency， pure drilling efficiency and elimination of drilling inefficiency. As a result， the drilling efficiency is affected by technology， production management， organization management levels， and some countermeasures to improve drilling efficiency are put forward.

Abstract:In view of the situation that rock burst control workers still work in hazardous areas underground， and the requirement that regional control of rock burst goes ahead of underground works cannot be met， the technology for key formation treatment by distant hydraulic fracturing through boreholes to relieve rock burst is put forward. By analyzing the geological conditions in the coal mine threatened by rock bursts and the hazardous characteristics of rock bursts happened in the resent years， it is understood the critical rock burst formation of massive hard rock is commonly developed in the roof of the coalbed， and the energy release in rock burst hazards meets the requirements of the “3 factors” theory on rock burst in north China C-P coal field and Jurassic coal field. According to rock mechanic analysis， the hard and brittle critical formation is easy to fracture. The technology to release rock stress in the key formation by hydraulicly fracturing is suitable. Since drilling technologies for underground long boreholes， deep holes and directional holes from surface have been technically proven， distant rock burst control in large scale by hydraulic fracturing in long borehole is feasible. The industrial tests showed that underground long borehole can be stage?-fracture up to 800m at 40MPa with fracture half-length upto； the vertical borehole drilled from surface can be as deep as 3000m with fracture segment greater than 100m at hydraulic pressure of 80MPa with fracture half-length about 100~200m long； the surface directional borehole can be drilled wi the inseam section as long as 1000m with hydraulic up to 80MPa with fracture half-length about 100~150 m. Analysis showed the pressure on coal seam or on shelf after fracturing was about 10MPa less than that before fracturing. Compared with conventional methods， the technology for key formation treatment by distant hydraulic fracturing through boreholes to release rock burst distantly have many advantages in regional and ahead control， engineering efficiency， safety and environment protection. The unmanned condition in the area threatened by rock burst can be realized in the hazard controlling process， and the requirement of regional and ahead control can be met.

Abstract:The drilling rescue in 2021 Hushan mine disaster is a typical case of successful borehole rescue in China. The hard formation and fracture easily lead to borehole deflection and sticking accidents. For this special condition， some drilling technologies such as DTH hammer air foam drilling and PDM deviation correction drilling was used to successfully complete the drilling rescue mission of the small diameter life support hole. This paper also summarizes the drilling rescue technologies for the life support hole， the drainage hole and the large diameter rescue hole， and puts forward some suggestions and problems on improving rescue work in the future.

Abstract:As an effective method， drilling technology has been used in emergency rescue in mine disasters. In this paper， according to different application objectives， emergency rescue drilling holes are divided into life support holes， life-saving holes， drainage holes， fire holes， gas drainage holes and so on. Three typical drilling techniques， including life support hole drilling technology， drainage hole drilling technology and large diameter life-saving hole drilling technology， have been successfully applied in mine disaster emergency rescue work and achieved good results. Strengthening the research and development of drilling equipment and related drilling technology will promote the development of emergency rescue in mine disaster accidents.

Abstract:After the mine accident， the first thing to do is to save people. If the shaft or roadway is damaged， rescuers must clean up the shaft and roadway if they want to reach the underground accident site. If cleaning takes a long time and there is high risk， they must decisively adopt surface drilling methods to rescue people. The small diameter borehole， also known as lifeline channel， is first drilled through to the roadway to provide life supply to the trapped miners， including air， food， drugs， communications； then， the large diameter borehole， known as rescue channel， is vertically drilled from surface for rescue. Taking the No. 1 rescue hole in the Qixiashan gold mine as an example， the drilling technology for the lifeline channel is introduced.

Abstract:In recent years， drilling vertical rescue wells is one of the important means for emergency rescue in mine accidents. When the mine accident occurs， and people are trapped underground， there is a golden rescue time window for the life of the personnel trapped underground； however， the surface rescue personnel are unable to carry out rapid rescue through the roadway. Advanced drilling technology can be used to drill boreholes safely， quickly and accurately to connect surface to the underground roadway ， so as to achieve the expected purpose of maintaining life and rescuing the trapped underground personnel. According to the geological conditions of the Yangchangwan mining area in Ningdong Coalfield， this paper mainly studies fast drilling technology， such as the hole structure design， drilling method selection， drilling tool structure design， drilling fluid design and drilling parameter design for small-diameter vertical drilling for mine emergency rescue， so as to provide support for vertical rescue hole drilling for Ningxia mines， and promote the improvement of the rescue success rate of mine accidents.

Abstract:At present， large-diameter borehole rescue technology is mostly used for rapid emergency rescue after the mine accident， which belongs to “post-event” passive waiting for rescue. In order to realize the transformation from traditional passive waiting for rescue to active and independent escape， the large-diameter rescue borehole is combined with the mine refuge chamber to build the disaster emergency escape system in advance. In relation to a field case of large-diameter man-wide rescue borehole drilling for the emergency escape system of the refuge chamber in a coalmine， the layout and structural design principles of rescue drilling are analyzed with focus on the selection of the drilling method， the sectional reaming process， drilling parameters， drilling fluid technology， well completion equipment and other drilling technologies， as well as the applicable conditions of large-diameter rescue drilling. The research results can provide reference for the implementation of large diameter man-wide rescue borehole drilling in similar mines.

Abstract:China is rich in hot dry rock resources which has a high utilization factor and can provide a stable base load for electricity. It is considered to be a renewable and clean energy capable of shouldering the important task of energy revolution. Its large-scale development is key to achieve "carbon peak and carbon neutrality". However， after nearly half a century， only a small number of hot dry rock demonstration projects of EGS in the world have a little power generation， and there are still many technical bottlenecks in achieving the goal of industrialization. By studying the EGS development process and drilling fluid technology， the author proposes that there is drilling fluid loss during EGS drilling. Therefore， the components of the drilling fluid itself， the drilling fluid and cuttings or the rock on the well wall， the drilling fluid and the surface rocks of the reservoir， will undergo various physical and chemical reactions under high temperature and high pressure to generate new substances. These new substances may precipitate on the well wall， and may even be consolidated with the well wall or the surface of the fracture. This reduces the effective space of the fracture， or even seals the fracture， and is difficult to remove； thus， decreasing the reservoir permeability greatly and leading to difficulty in gain the flow rate for power generation. Therefore， it may be a technological breakthrough in the industrialization of hot dry rock to innovate the concept of drilling fluid technology， study the relationship between drilling fluid components and cuttings and temperature and pressure under EGS environment and their influences on drilling fluid performance， and precisely predict and control the drilling fluid performance， the flow characteristics of the drilling fluid in the wellbore， and the compatibility of the drilling fluid with the reservoir rock with advanced computer data statistics， analysis and calculation techniques so as to avoid or reduce the loss of the drilling fluid and the reaction of the drilling fluid with the rock， and eliminate the reservoir damage and increase permeability.

Abstract:As the hole wall collapse and leakage in the process of geothermal development， and the conventional cement-based materials deteriorates under the condition of high temperature， which can not meet the requirements of the wall protection and leakage control. A series of experiments and theoretical analysis were studied to solve such realistic problems. A variety of materials and reagents are selected for orthogonal experiment to obtain the optimal formula. Through experiments， high temperature resistance is compared between ordinary Portland cement and G-grade oil well cement in terms of four performance indexes of initial fluidity， pumping period， setting time and compressive strength， and the relatively stable cement suitable for research at high temperature is selected； In order to solve the problem of cement performance degradation at high temperature， several silica containing materials and reagents were selected， and the formula was optimized by orthogonal test. The optimized formula was as follows： 25% GS+0.6% SiO₂ +0.3% JSS+1.5% SN+0.03% SC+0.3% nano material. The performance evaluation results show that the fluidity and other properties of the formula meet certain construction requirements， and have good compressive strength at high temperature.

Abstract:In order to better adapt to the requirements of green exploration， promote the green development of geological drilling， and promote the progress of green exploration， optimization experiment of environment-friendly drilling fluid additives and systems was carried out with the development of the environment-friendly drilling fluid system suitable for Qinghai coal measures complex strata through indoor experimental research focused on whether the environment-friendly drilling fluid system to be developed can meet the requirements of environmental protection and drilling engineering； and production test was successfully carried out in HF-4 borehole of the Muli Coalfield comprehensive engineering geological exploration project. Indoor experimental study and field application showed that the developed environment-friendly drilling fluid reaches the national environmental protection discharge standard for biotoxicity with EC₅₀ ≥ 30000 mg/L， has solved the technical problems of hole wall instability in complex Qinghai Coal Measures， formed an environment-friendly drilling fluid system suitable for Qinghai coal measures complex formation， and achieved good economic and social benefits， indicating that the technical achievement has a good application prospect.

Abstract:Drilling mud is an important part of drilling engineering. It plays a key role in ensuring safety， quality and rapid drilling， and is called “the blood for drilling”. As the hole depth gradually deepens， the existing drilling mud is unable to meet the requirements of current core drilling due to high density， poor rheological property， and thick mud cake. At present， low solid mud is mainly used， while various chemical treatment agents are added to improve its performance. This paper introduces the application of low solid phase drilling mud with X-A film-forming agent in drilling in LaoXuZhai copper mine.

Abstract:In the process of geothermal exploitation， considering water recharge， geothermal wells are generally arranged in broken zones or structural zones， and cement is used for plugging during the drilling process； in the end， plugging must be removed after drilling is completed so as to increase productivity. With conventional cement， plugging can only be removed by acidification in case that the permeability of the reservoir needs to be restored， and the ability to remove the plugging is poor. If temperature change in the geothermal development process can be used to prepare a degradable temporary plugging cement system， the exploration and development process of geothermal resources will be simplified， which will help reduce drilling costs and risks. In this paper， G-grade oil well cement， sand and gravel， reinforcing agents and water-soluble fibers are used to prepare temperature-sensitive， temporary plugging， and highly permeable cement-based materials. The material''s compressive strength， porosity， density， and setting time were tested to evaluate its degradation effect and basic performance. The results showed that the addition of water-soluble fiber significantly reduced the compressive strength of cement， while the reinforcing agent can slightly improve this defect. The porosity after curing in a water bath at 90°C was significantly higher than the control group， and the porosity continued to increase over time， which lays the foundation for the successful development of cement-based temporary plugging and permeable materials. Reinforcing agents and fibers will reduce the setting time of cement， while the effect of fibers in reducing the setting time is more obvious. The development of this material will simplify the exploration and development process of geothermal resources and help reduce drilling costs and risks.

Abstract:Hole wall instability in loose and fractured formations has always been one of the problems that plagued the drilling engineering community. Enhancing this type of formation and improving its mechanical properties are the technical keys to effectively solving the hole wall instability. In this paper， the microbially induced calcium carbonate deposition （MICP） technology is combined with the CMC solid-free drilling liquid phase to construct a microbial-CMC solid-free drilling fluid system. Through core immersion experiment， X-ray diffraction experiment （XRD）， and scanning electron microscopy， two microanalysis methods are used to explore the solid wall effect and microbial-CMC solid-free drilling fluid mechanism. The results show that the microbial-CMC solid-free drilling fluid has a more obvious reinforcement effect on loose and fractured formations. The longer the action time， the higher the initial bacterial concentration and the calcium source concentration， the better the wall-fixing effect. In the process of wall solidification， microorganisms penetrate the inside of the sample with the drilling fluid， induce calcium carbonate crystals between the loose particles， fill the pore space， cement the loose particles into a whole， and have a particular mechanical strength to achieve the reinforcement hole The purpose of the wall. The results of this study solve the problem of hole wall instability in loose and fractured formations and explore new drilling fluid technical solutions.

Abstract:One trip drilling technology is an important way to achieve safe and fast drilling and completion， reduce cost and increase efficiency. One trip drilling technology was adopted in Liulin CBM drilling， and drilling efficiency and economic benefits were significantly improved. Analysis of 7 completed “L” type horizontal wells showed that： proper selection of drilling equipment and the PDC bit suitable for stratigraphic characteristics， and real time optimization of the drilling fluid system provided basic guarantee to single trip operation； and the MWD survey tool of advanced technology， good performance and reliability， optimization of well trajectory， and accurate geo-steering were the key technology. Application of new technology such as long life mud motors， near-bit rotary steering systems， will certainly help with extensive use of the single trip technology in the region.

Abstract:In the hot dry rock exploration project in Tianzhen， Datong， a large amount of high temperature and high pressure gas-water mixture blew out of the well when drilling reached 1622m， which is extremely rare in the drilling of hot dry rock. In response to this major discovery of deep geothermal resources in the central and eastern region， the Shanxi Geological Prospecting Bureau organized experts to analyze and study the wellhead gushing situation. Through repeated practice， the square box was used to open and close the gate valve to achieve diversion with comprehensive treatment of “drilling-grouting-cooling-depressurizing-killing well-installing Christmas tree”. As a result， the geothermal well was successfully protected with power generation test completed. This paper analyzes the generation of the blowing well， and summarizes systematically the entire treatment process， providing valuable experience and technical support for future exploration and drilling for similar geothermal resources.

Abstract:In order to win the battle of preventing and controlling air pollution， fulfil the task of replacing coal burning， the Pingdingshan Municipal Party Committee and Government entrusted Henan provincial Non-ferrous Metals Geological Mineral Resources Bureau to organize the geothermal exploration and development in Pingdingshan area. According to the regional geological conditions and stratigraphic characteristics， Henan Provincial Non-ferrous Metals Geological Mineral Resources Bureau designed and organized the construction of well PBR01 in north Pingdingshan geothermal demonstration area. This paper introduces the whole process of the project designing and constructing from the aspects of drilling equipment selection， construction technology selection and drilling fluid configuration. Through drilling construction， the problem of large-diameter deep hole drilling in this area has been solved， which has played a good demonstration role for the subsequent development and application in this area. Through the analysis of the drilling time curve， the drilling efficiency of different areas in this region is understood， and the scheme to improve the large diameter drilling efficiency in hard rocks is put forward.

Abstract:In order to obtain the fracturing design parameters of the parametric well， it is necessary to perform array acoustic logging and micro-lateral resistivity logging， and obtain large diameter cores for mechanical test. With solid core drilling and coring technology， the borehole diameter can not meet the requirements of running geophysical logging tools， and the core diameter can not meet the experimental requirements， too. As a result， large diameter coring technology needs to be adopted to meet the design requirements. Meanwhile， the conventional coring process can not meet the requirement of shale gas exploration on the core （shale or coal core） retrieving time； but the wireline coring process has obvious advantages in this respect. This paper introduces the successful application of large diameter wireline coring technology in Chuanlincan-1. According to the structural characteristics of the large diameter wireline coring tool and the lithological characteristics of the target formation， the proper technological parameters and technical guarantee measures for coring drilling are summarized， and good results are achieved.

Abstract:Well PBR01 is a geothermal exploration demonstration well organized and implemented by Henan Nonferrous Metal Geology and Mineral Resources Bureau in the north of Pingdingshan. The completion depth is 2248.56 m and the final hole diameter is 216 mm. In the process of drilling， there were some problems， such as water gushing， leakage， collapse and stone falling， water sensitive instability， low efficiency of core recovery. This paper introduces the construction of the well from the aspects of geological formation， well structure design and drilling technology， and summarizes the achievements. By improving the performance of drilling fluid and plugging technology， improving the coring technology in hard formation， balanced cementing and other measures， the problems encountered in the construction were solved， and some experience and technology were accumulated for the middle and deep geothermal drilling in this area in the future.

Abstract:In order to further solve the development and utilization of coal bed methane in the Shanxi Jincheng mining area， coalbed methane in the lower goaf of the 3^# coal seam should be properly and effectively exploited and utilized to reduce the content of gas in the coal seam so as to ensure the efficient and rational use of coalbed methane， and provide safety guarantee for coal mining. This paper studies drilling technology for CBM horizontal wells through goafs in this area with the drilling process with DTH hammer and air PDM plus nitrogen put forward. With optimization of the well structure， the construction problems such as collapse， falling blocks and leakage in sensitive stratum in goafs were effectively solved. The smooth completion of coal-bed methane horizontal wells through goafs has verified the feasibility of the drilling technology， can provide guide for the coming large-scale development of coalbed methane.

Abstract:With the continuous progress in the development of coal-based minerals and the initiative of “carbon peak and carbon neutralization” raised by China， it is inevitable to enforce the implementation of green exploration technology. Based on the concept of green exploration and combined with the drilling process of coal bed methane， this paper focuses on the drilling technology for protection of the surrounding environment and the coalbeds. By analyzing the characteristics of the groundwater pollution， the main components of the pollutants and the main pollution pathway which are caused by drilling operations， pollution prevention and treatment measures and technologies are proposed. Two drilling technologies are recommended for the development of CBM as they can improve the drilling efficiency， and reduce the total amount of pollution and the pollution time during drilling. The paper also discusses green drilling equipment， drilling fluid technology and waste recycling technology.

Abstract:The five current methods of mining natural gas hydrates are summarized with focus on the analysis of CO₂ replacement mining and solid mining methods， and by analyzing the advantages and disadvantages of the two mining methods， a new approach， by which water jets erodes and breaks ocean gas hydrates in combination with CO₂ replacement， is proposed for the exploitation of natural gas hydrates， The mined-out area formed by erosion and breaking of water jets in the hydrate reservoir can provide better storage space for CO₂， increase its interaction area with the reservoir， and improve the replacement efficiency. The stored CO₂ hydrate can also increase the stability of the hydrate reservoir， providing good complementary effect. The experimental results show that during the entire replacement process， the CH₄ replacement rate in the reservoir containing the mined-out area is 24.3%， and the CO₂ storage rate is 22.1%； while the CH₄ replacement rate in the intact reservoir is 15.3%， and the CO₂ storage rate is 20.9%； indicating that the replacement rate increases about 59%， the storage rate increases about 5.7%. The function of the goaf is mainly reflected in increasing the injection volume of the hydrate replacement medium.

Abstract:Shenhu area contain a large amount of natural gas hydrate resources， which can effectively solve the problem of future energy shortage. However， due to the complex geological characteristics of the reservoir and the poor physical properties of the reservoir. The difficulty of mining， and the high development cost， a lot of basic research work is still required before commercial mining. This study uses numerical simulation to study the hydrates in the Shenhu area of the South China Sea， establishes a numerical simulation model based on actual geological parameters， uses a single vertical well mining method to study the impact of different production parameters on mining， and evaluates the geological subsidence. The results show that the well The lower the bottom pressure， the higher the degree of reservoir opening and the faster the gas production rate， but the more obvious the formation subsidence. In order to avoid geological disasters， the production pressure should be controlled reasonably.

Abstract:It is difficult to obtain all reservoir parameters due to complicate geological characteristics of the hydrate reservoir in the Shenhu area， South China Sea. In this study， by means of intelligent fitting， according to the actual gas yield in the trial production， the Shenhu Sea area in the South China Sea was selected as the target area， and depressurization mining was combined with vertical well network mining measures to improve the mining effect so as to solve the problem of energy shortage in China in the future. Due to the lack of precise values required for numerical simulation of hydrate reservoir parameters in the Shenhu area of the South China Sea， the reservoir physical property parameters were determined by the historical fitting method and long-term exploitation prediction was carried out to lay a foundation for subsequent hydrate exploitation experiments.

Abstract:In recent years， with the rise of energy consumption in China， the import volume of oil and gas resources has increased rapidly. The search for alternative energy sources has gradually attracted attention all over the world. Oil shale is an important alternative energy source for petroleum： huge reserves， wide distribution and broad prospects for exploitation. At present， the main mining methods of oil shale include surface dry distillation and underground in-situ conversion. Because surface dry distillation requires large factories， covers a large area， and pollutes the environment， underground in-situ conversion is valued. G-STARS numerical simulation software was used to establish an oil shale underground in-situ mining model for simulation of the oil production dynamics in the process of underground in-situ conversion of oil shale， and for analysis of the influence of different reservoir reconstruction parameters. The results showed that well spacing has an important impact on oil shale production. The larger the well spacing， the better the long-term exploitation effect of oil shale， but the worse the short-term exploitation effect. The higher fracture permeability only increases the cumulative oil production in the early stage， and has little effect on long-term exploitation.

Abstract:In this paper， the lifting process of the HCW-90 full hydraulic automatic catwalk drill pipe bracket is studied， and the influence of the synchronicity of the lifting hydraulic cylinder action on the movement of the drill pipe from the end of the bracket to the limit of the platform pin is analyzed by using the co-simulation method of multi-body dynamics and hydraulic control system. The effect of the synchronicity of the lifting hydraulic cylinder on the position and attitude of the pipe body， the dynamic parameters and the collision process between the pipe body and the stop pin at the end of the movement are discussed. The dynamic process and positioning accuracy of the pipe body tending to stability after being limited are also analyzed. In addition， considering the rapidity， stability and positioning accuracy of pipe transfer， the input signal of the hydraulic control system of the hoisting hydraulic cylinder has been properly adjusted， and under the premise of satisfying the working performance， the scheme of constructing the low-cost hydraulic control system by diverting valve is put forward.

Abstract:This paper has studied the movement that HCW-90 full hydraulic automatic catwalk drives a drilling rod over the stop pin and entering the V-groove， which involves three dynamic processes： the drilling rod over the stop pin， the drilling rod rolling along the transfer， and the drilling rod stabilizing in the V-groove. The control signal of the action of the hydraulic cylinder that manipulates the transfer mechanism is the main factor that affects the rapidity and stability of tubes’ movement. The synchronization of transfers’ movement determines the spatial attitude and positioning accuracy of tubes’ movement. This paper mainly simulated the dynamic performance of the mechanism transfer mechanism of HCW-90 full hydraulic automatic catwalk with the method of mechanical-hydraulic co-simulation， and studied the specific measures to ensure the stable movement of the drilling rod and improve the rapidity.

Abstract:CMD series modular drilling rig is a new generation of energy drilling rig developed to meet the national needs for energy exploitation and corresponding exploration drilling rig. In this paper， the performance parameters and structure functions of the existing CMD series drilling rig with various sizes are briefly introduced， and the advantages of the series drilling rig are summarized based on the application of the series drilling rig in actual geothermal drilling.

Abstract:The rig column is an important load-bearing part of downhole equipment. Its performance directly affects the safety and reliability of the whole vehicle. By establishing the three-dimensional model of the column， the mechanical analysis and finite element analysis of the column of ZDY12000LD directional drilling machine are carried out， and the strength of the column is checked under the maximum lifting force. The mechanical properties of the column are significantly improved by replacing the original column material Q345 steel with Q550 steel. The bending stress of the column is increased by 43%， the deformation is reduced by 4%， the bearing capacity and safety reliability are significantly improved， and the stability， safety and reliability of the rig operation are enhanced.

Abstract:The compound insulation pressure-resistant housing for deep drilling is designed mainly to solve the problem with the survey tool in extremely heat temperature high pressure environment. The mission target is to overrun extremely high pressure environment to descend vacuum unique hot heat preservation， high the water pressure seal completely analysis to correct etc. design key technique， develop to submit to have independence intelligent property right of the big depth separate hot compound the heat preservation accept to press tube， use the environment temperature can reach to 260 ℃ ， the environment pressure 130 MPa， keep vacuum unique hot the 8 h in the thermos bottle<80℃， pass the engineering Application in the subterranean heat the ability drill explore， dry heat rock drill explore， science drill explore， deeply the department the mineral resources investigate explore and deeply the department the oil the spirit the resources investigate explore etc. expand application realm， further promote instrument function index sign. Accept to press outside tube and thermos bottle carried on heat high pressure to experiment，Experiment result enunciation accept to press outside tube heat high pressure environment bottom work is credibility，The heat preservation ability of the thermos bottle as well the ability attain a technique a request，Certificate should design method is reasonable.

Abstract:The national major scientific instrument and equipment development project “Development and industrialization of ultra high temperature and high pressure drilling fluid rheometer” led by Beijing Institute of exploration engineering has lasted for five years， successfully developed super HTHP rheometer 2018 ultra-high temperature and high pressure rheometer， and achieved high precision viscosity measurement under the conditions of high temperature 320℃， low temperature-10℃ and high pressure 220MPa， The main technical indexes have reached the international advanced level， breaking the technical monopoly of foreign high-end drilling fluid rheometer and filling the domestic blank. The product can simulate the real high temperature and high pressure environment. The viscosity of different samples such as drilling fluid， fracturing fluid， gel plugging agent， xanthan gum and so on can be measured in real time according to the changing rules of temperature， pressure and shear rate. It can truly measure the rheological properties of samples under high temperature and high pressure environment， and overcome the disadvantages of the traditional roller furnace hot rolling test sample which leads to the high performance index of the test. Avoid the occurrence of underground accidents.

Abstract:In the process of drilling， when circulation loss occurs due to large fractures or small karst caves where plugging materials cannot work effectively， controllable plugging tools are an effective plugging method. In view of this severe circulation loss， we designed a kind of plugging tool which can be easily manipulated and can accurately deliver the interception bag and different types of plugging materials to the leakage position in the borehole. The tool can effectively prevent the plugging material from being diluted by water or washed away by water flow， and form effective plugging at the leakage position， so as to realize the plugging of large fractures.

Abstract:Lithium-ion batteries are widely used as an important energy carrier in modern civilization. Shallow drilling is an important sampling method for shallow investigation，and the application of lithium-ion battery energy storage technology to the development of portable drilling rig can solve the problem of survey and sampling over the fire restriction period in special landscapes such as mountain areas， forests， grass areas， and realize shallow drilling survey with zero carbon emission and help green exploration. This paper mainly introduces the parameters， characteristics and test of the lithium battery driven drill. The new type of drilling rig has the characteristics of light weight， compactness， no noise and no pollution； drilling parameters can be displayed and regulated； and drilling data can be collected and stored， etc. The application of lithium-ion battery energy storage technology in portable drilling rig has laid a foundation for the development of smart shallow drilling equipment.

Abstract:In oil and gas， unconventional oil and gas， and scientific drilling， drilling efficiency in sandy mudstone， and interbedded sand and mudstone is low， and the bit service life is short. Through the staggered arrangement of tooth shaped PDC and circular PDC， a new high-efficiency and impact-resistance PDC core bit was developed and tested in Lucaogou Formation of shale in Well 36-4 of Jimusaer Oilfield， Xinjiang. The results showed that the penetration rate of the new type of high-efficiency and impact-resistance PDC core bit was 2.4 to 3.1 times higher than that of other bits， and good social and economic benefits have been achieved.

Abstract:In order to solve the problem of fishing failure of the inner tube assembly in wire-line core drilling in complex formation， the development of the FDS-P wire-line coring tool has been carried out. Based on analysis of fishing failure causes， the design of the FDS-P wire-line coring tool has been completed. The rationality of the structure design was preliminarily verified through laboratory test. In order to further verify the performance， field production test has been carried out in shale gas wells in Guizhou. Sixteen core drilling runs have been successively completed， with cumulative footage of 39.03m， and core recovery over 98 percent. Core jams occurred six times and the inner tube assembly was successfully fished every time. Signals for the landing and core jams of the inner tube assembly were obtained in time. The application results showed that the structure design of the FDS-P wire-line coring tool was proper， and it had good warning on landing and core jam indication. Fishing reliability of the inner tube assembly has been improved significantly. Drilling efficiency and core recovery have been increased effectively when drilling in jam-prone formation.

Abstract:Riserless mud recovery drilling technology （RMR）， as one of the dual gradient drilling techniques， has the advantages of environmental protection， simple well structure， low engineering cost and high safety. However， as an emerging drilling technology， RMR has not seen any engineering application currently in China， and there is a lack of relevant field experience， though it is relatively mature in foreign applications. The most important thing is that the RMR control system has complex functions and high requirements for reliability， accuracy， and sensitivity. When faced with complex working conditions， the control system is required to respond promptly and accurately. Therefore， in order to develop the domestic riserless mud recovery drilling technology （RMR）， and to narrow or even surpass foreign drilling technology， there is an urgent need to make a relatively complete design of the control system. In this paper， in light of several typical working conditions in the drilling process with riserless mud recovery， analysis is conducted of the functions of the control system under different working conditions with the design of the specific realization form of the control function. It is desired that the research on the functional design and realization of the control system of the riserless mud recovery drilling technology can provide a useful reference for similar research in the future.

Abstract:As a new technology and equipment system， the riserless mud recovery drilling technique has been successfully demonstrated in many oil and gas wells all over the world. In regard to the riserless mud recovery drilling technique， this paper introduces the equipment system-the riserless mud recovery system with focus on the range selection， selection results and parameter calculation of the core equipment of the whole system-the mud lifting pump.

Abstract:Abandoned mines occupy land resource， and bring many ecological environment problems； thus， ecological restoration of abandoned mines is imminent. Currently， investment for mine ecological restoration is inadequate at various government levels， and social capital is urgently needed. Through a case study of market-oriented ecological restoration of mines in Jiangxi province， analysis is conducted of the direction of development and utilization of ecological restoration of abandoned mines and the applicable scope of the different ways of restoration， and it is made clear how the social capital investment participates and gets revenue in the operation of the ecological restoration of， providing a reference for regional market-oriented ecological restoration of mines.

Abstract:In mountainous areas， most of highways are built by cutting mountains and filling valleys. Due to the lack of ecological protection awareness at the early stage of construction， many bare high and steep rock slopes are exposed along the highways， leading to various geological disasters， especially collapses， landslides， debris flows and other disasters. In this paper， a geological hazard point of collapse along the 302 Provincial Highway （Maanshan village section， Linzhou city， Henan province） is taken as an example， with full understanding of the engineering geological conditions， hydrogeological conditions， joint development and stability of the collapse dangerous rock mass， the theory of ecological protection and restoration is adopted to integrate the geological disaster prevention and control system for collapse into ecological landscape planning， so as to improve the self-recovery ability and protection function of the ecological system in the treated area， achieving the purpose of ecological landscape restoration through disaster prevention and reduction.

Abstract:The management of the mining geological environment is a complex long-term systematic project. This paper briefly expounds the problems with the mine geological environment and puts forward the management measures. While economic construction is being carried out， priority should be put on ecology and green development. The idea of green development should be exercised through the whole process of mining resources development， utilization and protection， and an all-out effort should be made to promote mining geological environment treatment and ecological restoration projects.

Abstract:Rectangular anti-slide pile is widely used in geotechnical engineering construction design because of its special property of optimal bending moment resistance. Conventional rectangular anti-slide pile excavation can only be carried out by manual excavation， which has low efficiency， long period and great safety risks. In the practice of recovery and control engineering of Sanxing Dishui Rock landslide section， the author adopted rotary drilling machine to assist excavation， which greatly improved the excavation efficiency and shortened the manual underground operation cycle， reduced the hidden danger and risk， and provided a good reference value for the safe and efficient construction of similar projects in the future.

Abstract:In relation to the gate shaft excavation at a water conservancy project where the excavation size is 2 m×2 m for the shaft pilot hole， this paper introduces a new excavation method-the one shot blasting method for sinking of the central pilot hole with emphasis on the technical measures on how to complete the central pilot hole by one-time blasting. With this method， one shot blasting for the central pilot hole is combined with expanding excavation around the hole. The deep hole blasting method is adopted for excavation. Through the design of the blasting scheme， preparation before construction， mechanical drilling， charging， wire connection， blasting， safety inspection after blasting and other processes， the central pilot hole is first excavated and shaped by one shot blasting， and then it is expanded and shaped by shallow hole multi-cycle blasting through the surrounding rock from top to bottom， and finally the central pilot hole is formed.

Abstract:As the times advances， and science and technology progress， information technology has played an implicit role and influence on people’s work and life. In the field of drilling engineering， the Geocloud 3.0 platform provides a huge amount of data and information sharing for drilling industry. This paper， based on the release of Geocloud 3.0 platform by China Geological Survey， elaborates the application of Geocloud 3.0 platform in the drilling field， so as to help drilling industry practitioners to use Geocloud 3.0 platform to solve the problems in their work more efficiently and conveniently.

Abstract:In regard to the pile foundation excavation works of the Lot 1 Guanyinyan Interchange Bridge Project of the Changsha-Yiyang Section Expressway Expansion Project， study was conducted on the oil consumption of a 360 rotary drilling rig in the construction of different diameter pile foundations in this project with consideration of pile diameter， pile length， pile number， engineering quantity， and consumption oil ratio and other factors，， and analysis was made on the causes for the different mechanical oil consumption due to different pile parameters. It was concluded that the pile diameter is the key factor for the increase of mechanical fuel consumption， which has certain guiding significance for the selection of machinery in the pile foundation excavation project and the cost estimation.