Abstract:The formation of underground gas is related to the geological structure or geological activities, but underground gas eruption or overflow are mainly led by natural or artificial factors, such as drilling or mining. At early 20th Century, underground gas eruption or overflow were paid attention both in China and abroad to be applied mainly in earthquake monitoring or prediction. With the expansion of human activity space and periodic accumulation and liberation of intermittent energy in the Earth, the liberation of underground gas to other space are becoming more and more frequent, the main components are CH4, CO2, H2S and so on, which is one of the main causes of the air, groundwater and soil pollution as well as the personal injury. At the same time, a large number of documents and evidence prove that the earthquake and greenhouse effect as well as frog and haze are related to underground gas eruption or overflow. Therefore, the underground gas leakage is a new type of geological disaster, which is an important part of the livelihood geology involving a lot of scientific problems. Combined with the phenomena of underground gas eruption or overflow induced by drilling operation in south Taihang Piedmont (Hebi), the hazards and causes are analyzed in this paper and some geological science problems and specific suggestions are put forward.

Abstract:In recent 15 years, 2 large-scale collapses happened near Feiyun waterfall scenic spot, the volume of fallen rocks are accumulated to 450m3, rolling to the scenic path. A dangerouss rock mass and a dangerous rock belt were found by investigation. This paper gives a brief introduction to the geological features of the collapse in this scenic spot. The preliminary discussion is made on the causes of geological disasters and the natural development trend, the stability of dangerous rock mass(belt) is calculated, analyzed and evaluated, and the possibly-used treatment methods are compared and analyzed. In order to protect landscape resources to the greatest extent, avoiding treatment measures are selected, and the calculation on this treatment scheme are illustrated.

Abstract:By the field exploration on Xishan landslide in Datong County and the indoor comprehensive research analysis, the landslide scope, scale, development characteristics, formation mechanism, influencing factors and stability characteristics are found out, the stability and failure mode are evaluated and analyzed, which provide geological data for the feasibility study on landslide disaster prevention project and construction drawing design, and can be reference for the similar landslide exploration and control in Northwest China.

Abstract:Unexpected geological disasters frequently occur in China, it is urgent to improve the efficiency of emergency investigation of geological survey team. This paper introduces a newly-developed portable emergency investigation toolbox for geological disaster emergency investigation, which has the outstanding advantages of being suitable to team cooperation, emergency and application in field. Field application proves that data quick collecting, storing and transferring can be realized by the portable toolbox matching with the field data transmission device. Various standardized geological survey can be automatically generated after paperless field data input and the integration of collection, editing and output is realized, which greatly improves the comprehensive efficiency of the emergency investigation and provides technical support for the unexpected geological disasters emergency investigation.

Abstract:According to the geological disaster investigation on Ba-river basin of Sichuan Province, there are 11 collapses including 5 translational collapses, accounting for about 45% in total. Studies reveal that this kind of collapse has similar characteristics of translational landslide: sandstone in upper slope and mudstone at the bottom interlayer; slope angle nearly中国地质调查局地质调查项目“川东巴河流域地质灾害调查”（编号：1212011220171）、“大巴山区城镇地质灾害调查”（编号：121201019000150003） perpendicular; parallel slopes at trailing edge of the slope, fissures exposing to the surface and being enclosed on both sides. When heavy rain falls, rain flows into the fissures, which accelerates fissures expanding by hydrodynamic & hydrostatic pressure and splitting effect of high water head. The pushing out of upper sandstone layer on the mudstone layer results in free surface collapse. Therefore, the treatment measures should be paid more attention for such collapse, the prevention of water into fissures is very important.

Abstract:Combined with an example of an open pit coal mine in Inner Mongolia, a comprehensive study is made on the slope stability of open pit mine. By the existing engineering geological data, theoretical analysis and calculation means, the analysis and evaluation are carried out on the geological conditions and stability with optimized design scheme and landslide treatment suggestions. Finally, the control measures for slope stability of open-pit mine are put forward from the aspects of technology and engineering.

Abstract:Pseudo-soil cutting slope is an important type of slope in engineering construction with obvious differences between pseudo-soil slope and soil slope in terms of engineering characteristics. It is of great significance to get an in-depth understanding of engineering characteristics and instability mechanism on the pseudo-soil slope for safety construction and assessment during operation period. Based on the geological properties of highway pseudo-soil cutting slope and the influence factors of slope deformation, according to the example of K5 landslide deformation monitoring and early warning of Panxing highway, a landslide early warning method is put forward with displacement velocity ratio as early warning reference value, which made successful early warning in the left slope of ZK5 410～485 in Songtao-Tongren 1 bid section to avoid the casualties and reduce the economic loss, which provides useful guidance for engineering design, post-construction control and safety operation of pseudo-soil cutting slope.

Abstract:The landslide happened in the southwest of Yushan Village in Zoucheng of Shandong in 1950s, some farmland was destroyed. It was a shallow soil landslide, the landslide mass was mainly pebbly-clay; the sliding zone was located in the pebbly-clay and bedrock contact zone. Due to the artificial slope cutting, the sliding zone in the front had been exposed, and the sliding bed was underlying strong weathered diorite. In recent years, frequent human engineering activities may lead to the landslide reoccurring. In order to eliminate the risks of geological disasters, the combined control plan with cantilever retaining wall and water interception & drainage system was taken to achieve the control effect.

Abstract:The pre-stressed anchor cable technology is the common technology used in geological disaster control construction, such as landslide control, slope anchorage and so on. For traditional anchor cable, anchor head was freely placed in the inner anchoring section inside the hole and the grouting was carried out in absence of pre-stressed state of inner anchoring section. But for self bearing type pre-stressed anchor cable, grouting is conducted in the pre-stressed condition. It is advantageous to the full play of mechanical properties of the slurry material and rock. In the fractured rocks of medium hard, after the anchorage section is reamed and the self-bearing type pre-stressed anchor installed, the bearing body is expanded, and the anchor is firmly locked under the action of the friction force and the end bearing capacity of the hole. It is therefore necessary to develop a reaming drill tool and drilling technology which are suitable for DTH hammer drilling in medium hard rock stratum(compressive strength is less than 30MPa). The results of the indoor experiments of ream drilling show that the developed reaming drill tool and drilling technology can be used for reaming in anchor section.

Abstract:In the Mid-eastetn part of Zhejiang, sedimentary rocks are widely distributed, because of the bedding development and the weak interlayer, the bedding landslide is often occurring. Based on the engineering example, the design process and the construction method of the pre-stressed anchor cable to control the landslide are analyzed. The monitoring results show that the control measures are safe and effective.

Abstract:Unfavorable geological conditions were encountered in anchor cable construction for Changsha Ice and Snow World, it was difficult for drilling and hole completion. In view of the construction difficulties under poor geological conditions, the poor geological conditions evaluation basis were put forward, the treatment of pipe-sticking, hole collapse, water seepage, karst and fault were carried out in the drilling process with good effects.

Abstract:High pressure jet grouting as a grouting form born of the hydraulic coal mining and static pressure grouting combination has been successfully applied to geo-hazard prevention, reservoir dam and landfill leachate seepage prevention and reinforcement engineering, and achieved remarkable economic and social benefits. This paper discusses high pressure jet grouting seepage prevention and reinforcement from six aspects, including characteristics of high pressure jet flow, mechanism of high pressure jet grouting, factors influencing the formation of anti seepage consolidation body by high pressure jet grouting and its imperviousness, factors influencing the cutting and mixing range of high pressure jet grouting in formations, requirements of high pressure jet grouting on grouting materials, and common accidents and countermeasures of high pressure jet grouting. It has been put forward that the application of new technologies such as SJP grouting material and bionic non-smooth technology to high pressure jet grouting for resolving existing problems is a meaningful attempt and is also feasible.

Abstract:Portland-sulphur aluminate composite cement slurry has broad application prospect in rapid geological disaster management project, but the rheological properties directly affects the application effect. By combining theoretical analysis with test, the research on the rheological properties of portland-sulphur aluminate composite cement slurry with different mixing proportion was carried out. According to the test results, the curves of shear stress and shear rate of composite cement slurry were drawn; by measuring the time-dependent change of apparent viscosity of the slurry, the time-varying property of cement slurry viscosity was analyzed. The test results show that the water cement ratio has obvious influence on the flow pattern of composite cement slurry; water-reducing agent has no obvious rule to the flow pattern, but has great influence on the rheological parameters of the slurry.

Abstract:Slurry leakage is one of an engineering phenomenon during cofferdam seepage grouting process. It is important to take reasonable and effective way to solve problems related to slurry leakage in cofferdam seepage grouting project. With regard to a large number of slurry leakage cases in a cofferdam seepage grouting process during the Central Yellow River Diversion Project, field engineering conditions and reasons for the slurry leakage were analyzed, and proposal on adopting cement-sodium silicate double solution grouting technology was put forward to solve the problem. On the basis of analyzing coagulation hardening mechanism of cement-sodium silicate slurry, field application of cement-sodium silicate technology was analyzed, referring to grouting material, grouting method, grouting pressure, grouting end condition and hole sealing. Pressurized water experiment of inspection hole has shown that water permeability of lost circulation formation is much lower after cement-sodium silicate grouting treatment than before. It meets the design requirements by achieving the effect of blocking slurry leakage.

Abstract:For over 20 years, highway slopes diseases frequently occured more and more in Zhejiang. An investigation on slope safety risks of highways which are in operation in Zhejiang was therefore conducted. The results show that most of highway slopes are safe, which only need routine inspections and maintenance. Part of the slopes need appropriate checks and inspections and timely prevention treatment. The proportion of type Ⅱ slope in soil slopes is 32%. This type of slope needs enhance security checks and inspections to prevent soil slopes of type Ⅱ from converting into Ⅲ class.

Abstract:Guanyinge unstable rocks are located in Red Army Bridge Scenic Area of Luding County. Above and below the Guanyinge are unstable rocks, which are fracture, broken and dangerous. Guanyinge unstable rocks directly affect the safety of scenic spot and threat scenic construction and other residential buildings nearby. Through the analysis on the formation mechanism of Guanyinge rocks and basic characteristics, the characters are mastered and the stability is quantitatively analyzed and calculated. The results show that there is a high probability of rocks caving under rainstorm or earthquake and other unfavorable factors. According to the characteristics of the dangerous rock body, a comprehensive scheme of “lattice anchor” and “support anchor” are taken for the lower part and the upper part respectively to remove the hidden danger and accumulate experience for hazardous treatment.

Abstract:Fuzzy mathematics is introduced to the basis of the Extenics theory to form an Extenics analysis method based on fuzzy mathematics. Take an example of geological disaster of debris flow occurred during the rainy season in Qingyang of Huinan County, Extenics theory based on fuzzy mathematics was adopted to comprehensively analyze the risk degree of debris flow gully. The risk degree of debris flow was evaluated by the comprehensive factors, and the specific control scheme was put forward.

Abstract:A heavy slag debris flow occurred in Shimian of Guangyuan in July of 2013, which caused serious threat to the lives and property of the people there. Because of the particularity of this debris flow, there was little similar control experience in China. Based on the case of emergency rescue project in Guangyuan, the paper analyzes the causes of this slag debris flow and introduces the emergency rescue project and the design.

Abstract:Under the influence of long term rainfall and human activity, a high and steep loess slope on the mountain behind a residential area in Wuqi County has become hidden danger of geological disaster. The combination treatment plan of load decreasing soil nailing to strengthen the stability of slope was put forward. Combined with the actual situation, the parameters, process requirements and construction methods of level-by-level slope cutting and soil nailing support were designed respectively. In accordance with the construction plan, the slope has been effectively strengthened.

Abstract:Being a new type of flexible retaining technology, Gabion retaining wall is superior to the traditional methods. It has the advantages of flexibility, permeability, durability, seismic resistance and being conducive to vegetation growth, etc. In recent years, Gabion retaining wall is gradually used widely in the construction of water conservancy, waterway, highway, railway, mining, geological disaster, airport and so on. The development course of gabion retaining wall is reviewed. The hotspots such as interface friction characteristics of double twisted hexagonal wire mesh and various fillers of Gabion retaining wall at the present stage, the rupture surface form of Gabion retaining wall, the reinforced mechanism of Gabion retaining wall, the best reinforcing arrangement of Gabion retaining wall are analyzed. Finally, this paper discusses the lag of theory and the lack of design specification in the research on Gabion retaining wall and puts forward the countermeasures.

Abstract:The aggravated deformation of dangerous rocks in Wushan is a serious threat to the local residents and the safety of Yangtze River shipping. Rock drilling is the important means to make clear the dangerous rocks fracture development state and direction, and obtain rock and soil mechanics parameters. Through site survey, the difficulties are predicted for the countermeasures making. The diamond single-action and double-tube coring drilling method was adopted, the samples was taken in soft zone of dangerous rock base; borehole imaging technology was used to reflect the development state of rock fracture. The experience is accumulated for emergycy rescue in construction organization management, equipment selection, drilling technology, borehole imaging technology and safety measures.

Abstract:Being a widely used design method and theory, SAPB plays an important role, especially in the process of the overall design of the product. In this paper, this method is used to study the overall scheme design of radiation well horizontal drilling rig. First of all, from the analysis on the general function of the horizontal drilling rig, abstract the drilling machine function, then decompose the total function with analysis tools of SAPB design method to establish functional decomposition tree and function structure diagram of the horizontal drilling rig, finally the rig overall design scheme is got. This research can provide the convenience for the further design optimization of the drilling machine.

Abstract:Along with the rapid development of the city and greatly enriched people’s daily necessities, the amount of waste is growing quickly. Usually 2 ways, refuse incineration and landfill, are used for refuse disposal, but there are shortcomings of serious pollution and high cost. Based on the summarization of refuse disposal technology both in China and abroad, by means of hydro geological and engineering geological investigation and with salt water spray system, the smells from landfill leachate is effectively relieved and the secondary pollution is prevented.

Abstract:Green exploration is an advanced exploration idea and a belief; which is a systematic project for speeding up the construction of ecological civilization. It can be realized by integrate innovation, comprehensive analysis and several techniques. With the case of a plateau ecological fragile region, Ruoergai uranium ore field in Sichuan Province, this paper introduces the technical methods of “drilling instead of trenching”, “multi-holes at one position and multi-branches in one hole”, “green mud and purification treatment”, “portable equipment and tools”, which can reduce the disturbance and impact to the environment, and the existing problems are discussed.

Abstract:Ruoergai uranium deposit is one of the four basic types of uranium ore field in China, where the limestone, silicon limestone and carbonaceous slate are interbedded. The development of faults and steep rock occurrence in this area are the main reasons for hole leakage, collapse, shrinkage and deviation, which also lead to low coring rate, low drilling efficiency and low drilling quality. To solve these drilling problems in Ruoergai is a system engineering, the integrated innovation and management should be started from improving hole safety, drilling efficiency, construction quality, reducing rig moving times and improving removal efficiency to form a set of comprehensive drilling technology system suitable for the complex strata in Ruoergai. This drilling system has demonstration effects for drilling in Western Plateau and deep hole of complex formations.

Abstract:A new combination of core drilling with casing and downhole hammer technology is discussed in this paper, which is designed for the characteristics of overburden drilling combining with the new requirements of environmental protection for geological exploration. In consideration of economic and environmental impacts of drilling projects, this technology is centered on downhole hammer drilling, which can provide a new solution for the problem of low drilling efficiency and poor quality.

Abstract:For the project of the hazardous waste pollution emergency control in Jingjiang of Jiangsu Province, compared with rigid vertical seepage control block, flexible vertical block can better effects to block hydraulic relation between the landfill pollution and the surrounding soil and groundwater. Flexible vertical seepage control block has the characteristics of good impervious performance, strong anti-deformation ability and long service life. This article introduces the technical principle, construction technology and key points of construction of flexible vertical block.

Abstract:Qinghai Province is the birthplace of Yangtze River, Yellow River and Lancang River, known as “Source of Three Rivers”, “Headwater” and “Chinese Water Tower”. At the same time, because the economic development level is relatively backward, mineral resources economics is one of the main economic sources, and the supporting role of the mineral economics on GDP will still be difficult to be replaced by others in the near future. Being located in Qinghai Tibet Plateau, the ecological system is very fragile, the development of mineral resources is bound to cause serious damage to vegetation, water resources and other ecological environments. Grassland degradation, soil erosion, soil alkalization and hardening, prolonged dry season of surface water, groundwater salinity increasing and pastoral ability declining have appeared in many developed mining areas. In this background, it is imperative to establish a green prospecting standard. The paper discusses the necessity of formulating implementation of green prospecting standard for Qinghai Province and the related operating specifications.

Abstract:30HB Multifunctional Environmental Investigation Drilling Rig is widely used to environmental monitoring and protection. The rig can be taken undisturbed soil samples from the surface to the deep layer and be laid small caliber groundwater observation well under the condition of not destroying the soil structure. This chapter mainly introduces 30HB Multifunctional Environmental Investigation Drilling Rig’s technical parameter、 characteristic、 main structure、 working principle and technological innovation.

Abstract:As a gradual environmental geological disaster, soil salinization severely restricts the human life and the development of social economy, the improvement of saline alkali soil and the development & utilization of brackish water have become the hotspot in the world. Open channel, subsurface drainage and subsurface drainage combined with large diameter vertical shaft and alkali resistant plant were used for saline alkali soil improvement, but open channel and buried underground pipe have great damage to ground surface with disadvantages of limited water displacement and applicable depth, long plant improvement cycle and being time-consuming. By horizontal directional drilling (HDD), screen pipe can be horizontally or nearly horizontally installed in the aquifer and be laid perpendicular to the aquifer flow in a long distance. Compared with the conventional tube well drilling, there are advantages of larger water yield, low cost and small impact on the environment. The engineering example proves that this construction technology is ideal for saline alkali soil improvement, development

Abstract:The influence of the tunnel construction, mining and other human engineering activities leads to the serious drainage of groundwater in Chongqing mountainous area, vegetation destruction, which directly affects the ecological environment of the 5473km2 range of Chongqing urban economic circle. Through the drilling engineering of 20 holes with total drilling footage of 4646m, pumping and water pressure tests were carried out, the evaluation of groundwater quality and quantity in the mountainous area was made. Application of wells TV instrument for continuous imaging in the hole, using the hole logging data and imaging data, established the three-dimensional geological model. Monitoring equipment installed in the hole after completion as long-term observation sites. Real-time monitoring of groundwater dynamic changes can be realized by office computer and various types of charts can be automatically generated to provide hydro-geological parameters for the relevant departments and offers first-hand information for urban planning, engineering design and construction as well as government decision making.

Abstract:Coal bed methane resources are very rich in china. In the coal mine area, the development of coal bed methane (gas) can increase the supply of clean energy, improve the ability of coal mine safety production, and reduce the emission of greenhouse gas and so on. Surface and downhole drilling are the basic ways to develop coalbed methane (gas) and the main means of the emergency rescue in coal mine area. This paper introduces new technical equipment of coalbed methane exploiting on ground surface, large diameter drilling construction technology and equipment as well as boring technology and equipment for gas drainage in medium hard and soft coal seams as well as rock stratum. Based on the above, the analysis is made on the development demands on technology and equipment of coalbed methane (gas) drainage drilling in new situation.

Abstract:It has been found that there are rich gas hydrate resource in the permafrost on land and deep sea bottom. Gas hydrate samples were found in the bottom of South China Sea and permafrost mountain area in Qilian in 2007 and 2008 respectively. China is planning to conduct a trial production of gas hydrate in South China Sea in 2017 and is now making preparations for it. This article introduces the progress of gas hydrate trial production on land and preliminary technical plan for trial production of gas hydrate in the sea.

Abstract:Based on the special requirements of drilling for shale gas and coalbed gas exploration, the research is carried out on large diameter wire-line coring technology. This paper mainly introduces the structure, action principle, characteristics and drilling experiment effects of weighted combined wire-line coring drilling tools. Through the construction practice, the paper gives out some ideas on the development of large diameter wire-line coring technology.

Abstract:Some practical problems are exposed when long drilling rigs with large volume structure are used in coal mines with narrow alleyways and complicated geological conditions; for instance, the match of the functional structure and construction technology need to be improved, the mating and controllability of related equipments is imperfect. According to these problems, a kind of small narrow type directional drilling rig is designed by addressing some key technical issues; the performance and reliability of this new narrow type directional drilling rigs have been verified by industrial experiments and long-term application.

Abstract:Based on the borehole wall stability of shallow cover layer drilling for natural gas hydrate in northeast of the South China Sea, borehole wall stability prediction model for shallow cover layer of deep water drilling, the physical and mechanical parameters of sediments from the South China Sea and the research status of borehole wall stability of natural gas hydrate reservoir formation are analyzed and summarized. The difficulties of borehole wall stability prediction and the solutions are discussed, which provides the support to borehole wall stability prediction for marine gas hydrate bearing sediments drilling in shallow cover layer of deep water.

Abstract:Shale gas resource potential is tremendous huge in China. In recent years, the requirements of the drilling process and technology are continue to increase along with the efforts of exploration and development of shale gas and unconventional energy sources. Shale gas formation lithology is mainly mudstone, sandstone, shale, carbonaceous slate and limestone. Because of poor formation cementation, broken and low wall strength, hole wall instability, collapse and sticking or burying accidents were liable to happen in drilling process, the flushing fluid system with strong inhibitory, good compatibility, low cost, green environmental protection drilling fluids is needed in the drilling engineering construction. Based on the research on the mechanism of shale borehole wall stability, a low solid phase flushing fluid system with double polyethylene anti-sloughing and film forming anti-sloughing is optimized, which is suitable for shale formation. The system is consisted of inhibitors, anti-sloughing agent, agents, fluid loss additives, lubricants, blocking agents and flow pattern regulators with good inhibition and cementation. Good construction effects have been achieved in a number of field applications.

Abstract:Hole bottom sampling freezing technology is an effective method to get gas hydrate cores, the cooling capacity of wire-line coring hole bottom freezing sampler is determined by the cold storage chamber which can store dry ice and cool down alcohol. In this paper, cold storage chambers with different internal structures were designed, the experimental studies were made on their cold storage capacity and cooling effect. The thickness of the insulation layer was calculated, and 3 types of internal structure for the cold storage chamber were designed. The tests of cold-keeping ability show that the average loss rate of dry ice is 31.3% after being stored for 1h, which can meet the requirements of subsequent alcohol cooling. The tests also show that the storage cold chamber with perforated-pipe can cool alcohol in a short time, and the cooling rate is up to 36.3℃, which can meet the requirements for gas hydrate freezing sampling.

Abstract:SDBS fracturing fluid system of different concentrations and pH values will directly affect the stability of shale reservoirs, and then affect created fracture properties in Shale reservoir fracturing processing. Expansion deformation and wetting reverse of shale reservoir under the action of different concentrations and pH values of SDBS fracturing fluid were analyzed. The results showed that: Shale reservoir expansion deformation was minimized and swelling deformation rate was slowest in 0.02% SDBS fracturing fluid. The maximum contact angle of 30° was obtained in 0.03% SDBS fracturing fluid. Shale reservoir expansion deformation was minimized and swelling deformation rate was slowest in SDBS fracturing fluid with pH value of 8. The SDBS fracturing fluid with pH value of 9 and contact angle of 31.6° showed the best wetting reverse effect on carbonaceous shale. Comprehensive analysis showed that the influence of concentrations and pH values of SDBS fracturing fluid on shale reservoir characteristics has been quite different. That means that it is feasible to increase the rate of exploitation of shale gas by adjusting concentration and pH value of SDBS fracturing fluid.

Abstract:This paper presents a kind of liquid ionic consolidation agent, and this agent can effectively improve mechanical strength of shale gas wells. Through laboratory experiments, the basic properties of the drilling fluid treated with the liquidionic consolidation agent and inhibition of this kind of drilling fluid on the expansion of carbonaceous shale and effects of this kind of drilling fluid on mechanical strength ofcarbonaceous shale were uncovered. The drilling fluid''s filtration decreased and then in creased with the increase of the concentration of the liquid ionic consolidation agent.The expansion rate of the compressed core in the drilling fluid was lower than that inclear water. But with the increaseof the liquid ionic consolidation agent, the expansion rate of the compressed core in the drilling fluid was higher and higher. The shear strength of the shear specimens treated with the drilling fluid was higher than that treated with water. With the increase of the liquid ionic consolidation agent, the shear strength of shear specimens increased and then decreased, and the uniaxial compressive strength of the samples were increased. The results demonstrate that liquid ionic consolidation agent in suitable content range helps to enhance the ability of drilling fluid to maintain the stability of borehole wall.

Abstract:Because of the advantages of high gas production and low cost,U-shaped CBM well with production casing has gradually become main well type. The buried depth of coalbed is generally less than 500m in Panzhuang block and the horizontal section for U-shaped well is required to be about 1000m. For the shallow vertical depth and long horizontal section, production casing running is a technical difficulty in U-shaped CBM well of this block. In the tests in several wells, by optimization of drilling trajectory smoothness, 3 times of sweeping with original drilling tools, short spiral centralizer and drill collar in production casing as well as strict control on casing lowering program, the success rate of one-time casing lowering can be increased with higher production efficiency.

Abstract:Thin and medium-thickness coal seams are developed commonly in Guizhou, the geologic conditions of coalbed methane (CBM) exploration are complicated and special. Based on the analysis on the characteristics of coal seams development in Guizhou, the technology of full-zone and multi-stage fracturing was suggested. Several fractured segments are optimized in one same well, each segment comprises a plurality of adjacent coal seams and interlays between coal seams. Construction difficulty can be reduced by ball plugging and sand filling & sealing. Full-zone and multi-stage fracturing technology has been applied in CMB ground development demonstration project of Songhe mine of Liupanshui coalfield with some success.

Abstract:China is lack of relevant experience and key technologies in the field of shale gas exploration and is still in the exploratory stage in the aspect of micro-seismic monitoring technology. To ensure the effectiveness and reliability of such kind of project, we have carried out a series of researches in shallow well drilling for microseismic monitoring of shale gas exploration project by selecting the first-class drilling equipment and optimizing drilling tools, drilling technologies, cement slurry design and scheme of well cementation. The technologies have been successfully applied in the shallow well drilling projects in different locations of Sichuan province, including Luxian, Santai, Neijiang, Gongxian and etc, all receiving positive feedback from the clients.

Abstract:In view of the technical difficulties existed in large diameter borehole through coalmine gob area, based on the large diameter gas drainage hole construction practice in Xinzhuangzi coalmine, the construction process, drilling technology and casing & cementing technologies were analyzed and discussed. The key construction technologies for large diameter gas drainage borehole in coalmine gob area were summed up, which can be used for reference in similar engineering.

Abstract:Aiming at the problems of large gas emission in fully mechanized caving face and gas overrun at upper corner in Wangjialing coal mine, directional drilling machine and equipments are applied and directional drilling technology are used for gas extraction by high-position directional drilling. Based on the analysis on the law of gas migration in the mining process, large number of field practice is completed. The trajectory layout parameters of the high-position directional drilling hole suitable for Wangjialing coal mine is put forward. Upper corner gas overrun is effectively solved.

Abstract:This article introduces resources potential and principle of heat energy extraction of high temperature rock mass. In addition, characteristics of drilling operation of high temperature rock mass and drilling technologies are discussed, referring to hard rock drilling methods, drilling tools for high temperature directional drilling and bottom hole assembles.

Abstract:Since the beginning of the 7th Five-year-plan period, by the research and innovation, multi-process air drilling technology has been developed to have increasingly advanced equipments in China. This technology has played an important〖JP〗 role in accelerating the development and utilization of geothermal resources, protecting the environment and realizing low-carbon economy. Combining with the production practice, on the basis of the elaboration of the advantages of this technology and its application in geothermal well construction, the paper introduces the matching of multi-process air drilling technology and geothermal well drilling equipments as well as drilling technical measures.

Abstract:The huge geothermal energy contained in hot dry rock of the earth’s crust has become the research focuses for new energy development worldwide. At present, in the key technology of thermal recovery, or the formation of a heat exchange system in impermeable hot dry rock body, there are three modes, namely engineered artificial fracture system, natural fracture system and natural fracture-fault system. Hydraulic fracturing is a commonly used method for artificial thermal reservoir construction. Research in this area in our country is still in an experimental simulation stage. We completed one hot dry rock exploration hole (GRY1 hole) and 2 groups of hydraulic fracturing test and achieved good results in Chenzhuang town of Lijin County in 2014.This paper gives a brief introduction to the results of the project and aims to provide certain reference for future research on artificial heat reservoir construction technology.

Abstract:In order to develop fracturing fluid of water well with high viscosity, low filter loss, good sensitivity, through the cementing agent matching, crosslinking agent matching, gel breaker matching and preservative matching, as well as formula testing methods, according to Tian celadon powder, pepper konjak powder, hydroxypropyl base guar gum, Fenugreek Gum formula indoor test, we preferred the suitable for hydraulic fracturing of bedrock wells fracturing fluid and its proportion. Special fracturing fluid for hydraulic fracturing of bedrock water well is mainly used as main agent of field green powder, and auxiliary agent, antiseptic agent, gel breaking agent and other additives are used as auxiliary agent. The fracturing fluid has the characteristics of low cost, stable performance, no pollution and so on. As one of the key technologies of the hydraulic fracturing technology of the bedrock water well, the research of the fracturing fluid has laid the foundation for the realization of the hydraulic fracturing technology of the bedrock water well. At the same time, we have accumulated the experience for the study of fracturing fluid for different lithologic rock formations. We hope to provide some reference for the research work in related fields.

Abstract:Wumeng mountain groundwater exploration and production is a national key poverty alleviation project, combining hydro-geological investigation with water supply well construction, this project provided drinking water for more than 50 thousand people by more than 50 constructed exploration wells. Pneumatic DTH hammer has played important role in this project; this paper describes its technical advantages, introduces this drilling technology about the construction process, equipment selection and the typical complex conditions treatment, and puts forward the research direction of this technology in hydrology and water well construction in nest step.

Abstract:In hydro-geological drilling, the influence of drilling fluid on aquifer clogging and water yield of the aquifer has been the problem that we care about. The thin and tough mud cakes, which are formed by the high quality drilling fluid, are good for well washing with high performance. In the drilling process, high quality drilling fluid can quickly form mud cake on the borehole wall. This in turn prevents free water from invading into the pore channels of the aquifer. So that solid phase diffusion radius is small and water yield is high. It is good for the evaluation of hydro-geological parameters. When conditions permit, the hydro-geological drilling fluids can be ranked according to following order of priority: low density washing medium, solid free drilling fluid, coarse dispersion drilling fluid, fine dispersion drilling fluid and water. This paper briefly introduces the requirements, type selection and performance index control of the drilling fluid used for hydro-geological drilling, and we hope to provide some reference for the use and management of the drilling fluid in the hydro-geological drilling.

Abstract:Screw drilling technology was introduced to ZK1 geothermal well drilling construction in Zunyi of Guizhou, in order to meet the requirements of screw drilling technology on drilling fluid property and deal with the complicated geological conditions, a comprehensive analysis was made on the formation characteristics and complex degree as well as performance parameters of drilling fluid for drilling process. Drilling fluid proportioning experiment was carried out in laboratory. Through the application in this well, it showed that the drilling fluid has good properties of strong adaptability, moderate viscosity and reasonable filter loss with thin and compact mud cake, which can prevent borehole collapse and diameter shrinkage to reduce accident rate and can provide sufficient power for screw drilling to meet the requirements of screw drilling technology and improve drilling efficiency.

Abstract:With the advantages of green, clean and easy exploitation, geothermal energy is widely distributed and has irreplaceable role in the fields of heating, tourism, spa bath, health care and cultivation & breeding. Guide area is located in the “Source of Three Rivers” area, the development and utilization of geothermal resources will play a role in ecological environment protection there. Heat exchange process was used in DR1 deep geothermal well in Guide basin, the water outlet temperature increased from 41℃ to 46℃, the outlet temperature of geothermal well was risen by self heat exchange of high-temperature rocks at the bottom, which can be reference for geothermic warming in similar strata.

Abstract:Geothermal energy is a clean energy source; its development and utilization are mainly realized by drilling engineering, and the value of development and utilization are determined by the amount of geothermal resources (water yield). In practice, due to the complexity and uncertainty of the stratum, the water yield and water temperature can not reach the expectation, especially in water-shortage mountainous bedrock area, development and utilization of clean energy source are seriously affected by low water yield and temperature indexes. Staged hydraulic fracturing technology by using fracturing truck and drilling pump is applied in serious water shortage area of Westen Henan for the first time, water output grows 3 times for low yield geothermal well and reached the expected target.It can provide reference for the future development and utilization of geothermal and groundwater resources in the bedrock area.

Abstract:There are abundant geothermal resources in Jinghong basin. Based on the geological conditions of geothermal well for geothermal resources exploration, construction conditions and the achievements, combined with the practice and experiences obtained in geothermal resources exploration, this paper summarizes and analyzes the geological issues related to geothermal resources exploration, geothermal well drilling, completion technology and well drilling; and discusses the relation between geological conditions and geothermal well construction. Some questions for the specifications in the current standard for geothermal well are raised, such as well body structure design, water level determination and calculation of single well resource, which is meant to find out valuable experience and lessons for geothermal resources exploration by practice and discussion.

Abstract:Combined with water well construction, the application researches on solid-free weak gel drilling fluid and enzyme breaker fluid were carried out. The weak gel drilling fluid has unique rheological characteristics, high yield point-plastic viscosity ratio (YP/PV), high low-shear rate viscosity (LSRV) and strong sand carrying capacity. In addition to cooling drill bit, clearing rock cuttings in bottom of the hole and protecting borehole wall, another advantage of this drilling fluid is solid free, so that it is not easy to clog the formation pores, and it reduces aquifer damagecaused by the solids in drilling fluid. If enzyme gel breaking agent is added to drilling fluid, it helps to clear out the filtrate cake in the well and dredge water channels in the formation and achieve better single-well yield and permeability coefficient, which provides a new method for strengthening aquifer protection in the well construction.

Abstract:The rock formations encountered in geothermal well drilling in Guizhou are mainly limestone, dolomit and some unstable formations such as sandstone, mudstone and coal seam. To meet the demands of keeping borehole stability and matching with screw motor drilling tool, potassium-ammonium polymer drilling fluid was optimized. The drilling fluid formulation was obtained through orthogonal tests, and a series of performance tests were conducted in laboratory. Test results show that FT-1 and QS-2 have a synergistic effect on effectively improving mud cake quality, and the friction coefficient of the mud system can be reduced to less than 0.2 by adding 1% of white oil into the system. The new drilling fluid system has good rheological properties with strong inhabitation ability and good lubricating property. Compared with solid-free polymer drilling fluid, the new novel drilling fluid has stronger borehole cleaning ability and lower risk in loss of circulation, the ROP can be increased by 129%.

Abstract:With the characters of high temperature resistance and high rotation speed, turbodrill plays an important role in the process of high temperature and hardpan layers drilling and has become one of the research hotspots in the areas of hot dry rock (HDR) and high temperature oil and gas well drilling. Starting from the development history of turbodrill, the article systematically summarizes the specialties of turbodrill. The researches progress of turbodrill both in China and abroad are overviewed in stucture improvement, design and processing of blades, performance improvement for the bearing supporting, research and development of the deceleration turbodrill and exploration of advanced drilling techniques. According to some problems found in the research on trurbodrill and combining with the actual demands in related fields in China, main researching focuses of turbodrill in the future are proposed.

Abstract:With the continous development and utilization of geotemperature energy in recent years, heat exchanger, as an important unit of ground source heat pump system, its style and type are increasing rapidly. At the same time, in the field of geotemperature energy exploitation in cold regions, due to some defects of traditional heat exchangers in the structural design and the use, the ground source heat pump system in cold regions can hardly reach the design goal. So it was urgent to develop an efficient and economical heat exchanger suitable for geotemperature energy collection in cold region. On the basis of the geological conditions in cold regions and the performance demands of heat exchanger, an efficient geotemperature energy heat exchanger for cold regions is developed. The paper introduces this heat exchanger about its structural style, technical parameters, installation and application and so on.

Abstract:On July 2 of 2016, 12 miners were trapped underground in water inrush accident of Zhongcun coal mine in Shanxi. Accurately drilling 114m to the tunnel by using CMD100 type truck mounted drilling rig and DTH hammer drilling technique, a life passage was rapidly established to deliver urgently needed supplies and win the precious time for further rescue, 8 trapped miners were rescued. The paper introduces the rapid construction technology of No.2 food supply well in this mine rescue and puts forward the suggestions on the construction of professional emergency rescue drilling team and equipment matching.

Abstract:On Dec. 25 in 2015, collapse accident happened in Pingyi, many people were trapped underground. By the unremitting effort, 4 survival miners were rescued after being trapped for 36 days, which created the first rescue case by drilling hole from the ground in the history of China''s mine rescue. In view of this case, some related problems such as mine accident rescue, mine geological disaster prevention and control and emergency rescue by large diameter drilling on the ground are discussed.