Abstract:Hole hydraulic mining technology of mineral resources(HHMTMR）is a kind of application of drilling engineering in mining industry, and is an important development direction with innovation significance. In this article, the work principle and technological process of HHMMR are introduced, hydraulic parameters of jet stream and drill bit used in petroleum jet drilling are discussed, jet perforator used for cutting ore and rock in the hole bottom and its design parameters are also discussed and some suggestions about means and methods for improving this technology are put forward. Because of the advantages of good engineering returns, high safety factor and good ecological environment protection, HHMMR has being researched on and applied in foreign countries, for example in USA and Russia. It is suggested to strengthen the research on this technology to broaden the innovation development and service space of exploration engineering in China.

Abstract:In order to meet the requirements of solid mineral exploration at the depth of 10m to 30m in offshore of the continental shelf over 100km from the coast belt, and also meet the requirements of CSDP-02 well drilling construction of China Geological Survey “China East Sea Area of Scientific Drilling Project Construction”, according to the past experience and the basis of the research on simple offshore platform, drawing lessons from design concept of large oil drilling platform, a multifunctional shallow sea drilling platform “Tanhai No. 1” was developed. The practical application shows good effects. The platform deck structure adopts the innovative form of module staggered joints and reliable pile system. The scheme design, manufacturing, offshore installation and the application effects of the platform are introduced.

Abstract:In order to improve stress conditions of wireline coring drill rod and extend the service life of wireline coring drill rod to meet the special deep hole drilling and construction requirements,this paper carries out the experimental study on the partition heat treatment process of wireline coring drill rod.The experiment chooses high grade thin-walled tubes,the interval of about 300mm rod ends are bath quenching and tempering process, which ensures the mechanical properties of the quenched area,hardness and microstructure uniformity is good, while heat treatment transitional area of influence is small.Prototype manufacturing special deep hole wireline coring rod has features of strong rigidity at both ends of the connection section rigid and good toughness at central rod,the drill rod used in Shandong Laizhou site drills 2845.55m, use effect is very good.

Abstract:With 3D modeling software SolidWorks, 3D model of portable core drill power head was built, which was introduced into the finite element analysis software ANSYS Workbench to obtain finite element model. Based on the finite element analysis method, the dynamic characteristics and other mechanical properties of the key components in the power h西南地区典型重大突发地质灾害调查（编号：12120113096700）ead were analyzed respectively. The analysis on the strain and deformation of gears during drilling process proved that the gears met rigidity, strength and other mechanical properties; and the contact conditions of gears contact area was also analyzed. The simulation was made on drill pipe hoisting and lowering, pressure drilling and decompressed drilling to analyze the force and deformation of the spindle to provide basis for the spindle design. The analysis was made on the strain and deformation of gear box in the drill pipe hoisting and lowering process to prove good rigidity and strength; according to the modal analysis on the box, the natural frequency of the box is obtained and the dynamic performance of the box is verified.

Abstract:A method of improving the mass ratio of DTH hammer and impact hammer by large cavity structure is presented to increase the drilling efficiency of DTH hammer, and LS-DYNA dynamic analysis method is applied to conduct the simulation analysis on the large cavity structure of DTH hammer bit’s rock fragmentation efficiency and stress state. The results show that the large cavity structure can reduce the mass of DTH hammer bit and adjust the mass ratio of DTH hammer bit and the impact hammer, which can obviously improve rock fragmentation efficiency. The mass ratio is changed from 0.79 to 0.91, the biggest absorptive impact energy change rate in the processes of rock collision and after the collision were 41.13% and 67.17% respectively. The forces of two kinds of large cavity DTH hammer bits meet the fatigue strength requirements for long-term operation. The numerical simulation calculation results show that this structure of DTH hammer bit is feasible in the construction.

Abstract:In the completion process of in-situ leaching borehole, the common gravel delivery equipments used at present are mainly slurry pump and non-subject gravel delivery devices. The gravel delivery device based on the ejector principle has wide range of field application, in order to improve its working efficiency and delivering quality, the optimization analysis is made on the numerical simulation of ejector structure of gravel delivery device based on the ejector principle by employing numerical simulation software Fluent based on computational fluid dynamics in this paper. The analysis results show that the diameter of the nozzle has great influence on the performance of the ejector and the injection coefficients of ejector decrease with the increase of ejector nozzle diameter, but the smaller nozzle diameter will lead to the increase of pump pressure load of mud pump. For BW250 mud pump used in the field site, the required maximum pressure is not greater than 6MPa, so the optimal nozzle diameter in the study is 5mm in this case. For the increase of the mixing chamber diameter will reduce the performance of the ejector, the optimal parameter is determined as 18mm based on gravel passing capacity and some factors; the appropriate increase of the length of mixing chamber is beneficial to improve the ejector performance, ideal length of 120mm is decided after optimization. The delivery efficiency and quality of optimized delivery device are greatly improved than those of original delivery device based on ejector with large diameter nozzle.

Abstract:In order to optimize the impact hammer structure of high blow energy SC-86H liquid-jet hydraulic hammer, 2 liquid-jet hydraulic hammer with different structures of impact hammer were studied by means of CFD dynamic simulation. The calculation demonstrates that the performance of the newly designed impact hammer has advantages compared with the traditional one under the condition of the same input flow rate; the last impacting velocity is improved, the impact energy and energy utilization increase by 7.9% and 12% in average respectively. The energy consumed by the fluid resistance was reduced by new impact hammer structure to increase the high energy output. In addition, rock breaking efficiency of the hammers was studied based on Ls-dyna nonlinear kinetic analysis and the analysis was carried out on the stress intensity of the newly designed impact hammer. The results show the higher efficiency of energy transfer of impact hammer with new structure, which meets the requirement of fatigue strength checking. At the same last impacting velocity, energy absorption value of rock strata is higher than the traditional impact hammer, while the newly designed impact hammer has high energy absorption ratio. The energy absorption ratios of these two impact hammer models increase nonlinearly as the incident energy increases.

Abstract:Horizontal drilling technology is an important way to realize the development of tight oil. The pilot tests of horizontal well group were carried out in Qijia and another two tight oil blocks since 2013. The construction in Qijia was the most difficult, where there were characteristics of long horizontal section and large horizontal displacement with technical difficulties of poor formation drillability, 3D adjusting azimuth, low ROP and long drilling cycle. Based on the analysis on geological characteristics, by optimizing casing program, controlling well trajectory, optimizing 3D well trajectory, making technological breakthrough in personalized bit, friction & torsion reducing methods and matching tools, and according to the field application effects, a set of ROP improving technology for tight oil horizontal well in Qijia block of Daching oilfield has been developed with good results, the foundation has been laid for the further ROP improvement and large-scale application of ROP improving technology for tight oil long horizontal well in Daqing oilfield.

Abstract:Drilling fluid recovery technology was applied in a horizontal well drilling process in Dongsheng gas field, by means of electrochemical treatment, precipitation and performance adjusting by reagent feeding; drilling fluid was recycled through harmless treatment to reduce wastes pollution. But the solid particles with diameters less than 5μm were still remained and drilling fluid would be polluted by these particles accumulation. The contaminated drilling fluid would lead to downhole accidents to increase drilling cost even well abandonment. Potassium chloride polymer drilling fluid system was applied for testing to solve borehole wall instability and lost circulation, which provides reference basis to reasonable application of drilling fluid recovery technology and potassium chloride polymer drilling fluid system.

Abstract:Oil and gas ascending velocity plays an important role in making next-step work plan during drilling operation. In this paper, the traditional formula of oil and gas ascending velocity is modified based on the analysis on previous experience and combined with the actual construction practice, and the parameters involved in the revised formula are analyzed one by one, the accuracy of each parameter in the formula is further improved without affecting the normal construction procedure. Through the field engineering test, this method is proved to be simple and practical with high calculation accuracy. This method can not only ensure the accuracy of the calculation results, but also has good maneuverability.

Abstract:Poor drilling efficiency in deep formation and serious bit wearing are caused by gravel-containing formation, hard rock and roller cone drilling for more than 85% of the well sections in Gucheng region of Tadong block of Daching. Based on the traditional drilling speed prediction method, the calculation method of rock breaking efficiency is established by introducing the related parameters of bit wearing, formation lithology, well depth and so on, and based on the formation lithology, logging data and drill bit types, the optimization model of drill bit is set up to realize quantitative bit selection, bit series recommendations suitable for Gucheng region is put forward, which was successfully applied in 5 wells, the footage of single bit and the average penetration rate have been greatly improved, the bit optimization provides technical basis for efficient drilling construction in Gucheng region.

Abstract:H050 is one of the horizontal wells in the phase IV of Turkey Beypazari trona solution mining project, which should be connected to another vertical well V050 to form a solution mining unit according to the original construction design. For this well unit is placed at the edge of the mining area, the original construction design is modified by setting additional 3 controlling target wells between H050 and V050 to ensure the leaching passage in the trona layer. The designed locations of these 3 wells are at edge of cliff or near the old production well, 2 wells were moved several meters away for convenient construction. By directional drilling, the bottom target area of one borehole went back to the required location. Finally, H050 is connected with 4 target wells to realize long horizontal drilling. Combined with the construction practice, this paper summarizes some crucial construction techniques of multi-target wells intersection to provide reference to similar drilling construction.

Abstract:During the construction of large diameter pumping well crossing multi-layer goaf, the leakage problem of conventional mud rotary drilling and the aperture limited problem of DTH hammer drilling were solved by introducing the DTH hammer and air-cooled roller bit combined drilling technology. The application of this technology in 2 φ550mm pumping wells crossing four-layer goaf indicates that the average drilling speeds of φ350mm DTH percussive drilling and φ550mm air-cooled roller bit reaming are 3.31m/h and 2.27m/h respectively. High drilling efficiency was kept in complex formation with obvious application effects. The paper introduces the application cases of φ550mm large diameter pumping well project in Datong mining area, the practice proves the feasibility of this technology, which can be provided for similar drilling construction.

Abstract:The steel pipe column is the vertical load-bearing structure of top-down method, bored grouting pile is often used as its foundation. The bottom ends of the steel pipe piles were embedded in pile concrete to form the structural system with one column on one pile. Because of the vertical loads on this structural system, the requirements on the bearing capacity, verticality and settlement of the pile foundation are very strict. According to the problems of large diameter rock-socket revolving digging bored steel pipe columns construction under complicated geological conditions, this paper analyzes the different causes by examples and proposes prevention measures to ensure construction quality, which can be reference to similar project.

Abstract:When there is confined water at the bottom of foundation pit in the basement excavation and foundation construction process, if the design is inconsiderate or the construction operation are improper, piping will occur caused by drilling through confined aquifer. According to the engineering case of a foundation pit piping treatment in Ningbo, steel casing, high pressure jet grouting pile and double fluid grouting comprehensive processing technology are presented in this paper, the above technologies can effectively deal with the similar accidents.

Abstract:There are many difficulties in the construction of deep foundation pit support system. In the complex formations, the suitable construction scheme should be selected flexibly according to the actual situation on site. Quicksand stratum was encountered in a foundation pit supporting construction in Taiyuan, the extended end anchorage cable took was used in stead of the conventional anchor cable, and groundwater and sand inflow were effectively controlled. The combined use of conventional anchor cable and the extended end anchorage cable has remarkable effect, which ensures the safety of supporting and retaining structure, reduces the influence on adjacent buildings and reduces the cost of foundation pit support.

Abstract:Taking the brazed diamond bit as research object, the paper analyzes and summarizes the thermal dynamic theory of the heating process in high temperature brazing furnace and the cooling molding process, and makes the numerical simulation for the cooling process on the whole entity model after being removed from the brazing furnace. By analyzing the temperature field of brazed diamond bit and cooling molding process as well as the effect of the temperature field on the stress field of brazed diamond bit, the stress between the inner graphite mold and the brazed diamond bit was also analyzed. The comparison was made on the simulation data with theoretical calculated values, which verified the good consistency between the numerical simulation and theoretical value of brazed diamond bit’s cooling process.

Abstract:Aiming at the low efficiency of manual record in emergency survey for geological disaster, untimely emergency data transmission and indoor manual data processing, the development was carried out in supporting data acquisition terminal for geological disaster emergency survey toolbox, focusing on the design of automatic data collection, electronic data, real-time data transmission of emergency data, intelligent data management. The paper mainly introduces the design and development of a set of intelligent geological disaster emergency investigation software based on tablet terminal of Android system, this software follows the technical specifications of geological disaster investigation, using structured and standardized questionnaire template and combined with visualization Maps data resources to provide more intuitive, convenient and efficient technical support means for geological disaster investigators to collect on-site data (such as text messages; spatial information of disaster spot; voice, video and picture messages of disaster spot; planar graph, sectional and sketch drawing) and post-disaster point management. By GIS technology, this software displays the collected data on the map platform in a visual way, detailed information of the spatial distribution of geological disasters and hidden dangers, disaster type and disaster rating are intuitively reflected to provide technical support for geological disaster investigation.

Abstract:Underground is widely applied in geological prospecting, mining exploration and other activities; especially when the removal is limited by the difficult surface drilling in deep dissected topography, underground drilling is sure to be the preferred technique for further exploration to extend the service life of the mine. As for its equipment modularization, working environment, construction conditions and other aspects, the ability of drilling depths can’t meet the requirements of the increasing development of geological prospecting and construction management. At the same time, China’s professional standard of underground drilling needs to be supplemented and improved. Only by proper evaluation of construction conditions, analysis on construction characteristics and developing appropriate technical methods, can safety construction and drilling construction capability of underground drilling be efficiently guaranteed. In this paper, based on the drilling equipments, technology, construction environment and years of experience of underground drilling, the characteristics of full hydraulic underground drilling construction are summed up, common methods and convention of underground drilling are collected and organized into specification as regulation, which are used to guide the safe and efficient production, can provide the basis for safety management and also can provide reference for the supplement and perfection of industry standards.