Abstract:The engineering education accreditation system is the basis to achieve international mutual recognition of engineering education and engineers. In this paper, the authors, taking the geological engineering in Central South University as an example, introduces the Geological Engineering basic profile, training objectives and training requirements associated with the standards of knowledge, ability and quality requirements with analysis focused on the organizational management and guiding ideology of continuous improvement work based on engineering education accreditation. According to the actual process of continuous improvement, some methods are discussed, including the revision and improvement of the curriculum system, relationship between different curriculums, arts literacy education, application of various technology and modern tools to teaching, engineering practice ability training, enterprise participation in personnel training and planning revision. It points out that continuous improvement has a significant promotion effect on teaching and learning.

Abstract:In order to maintain the stability of deep ice core drilling borehole wall and avoid the occurrence of in-hole accidents, the hydraulic fracture become one of the important scientific problem which need to be solved urgently. On the basis of deep analysis of the ice drilling data, and combining the ice sheet dynamics related theory, we calculated the change rules of ice density, temperature and internal stress with depth. Then, combining the hydraulic fracturing technology in oil and gas resources exploration drilling and ice drilling fluid theory, we established a reasonable differential pressure calculation method of ice borehole wall and discusses the mechanism of hydraulic fracturing for deep ice drilling deeply. By developing a true-triaxial hydraulic fracturing equipment, we obtained the brittle deformation mechanism of ice borehole under different confining pressures. Combining the actual deep ice core drilling in Dome A, we obtained the depth interval and necessary initial fracture length of occurring potential hydraulic fracture in this borehole. This method provides an important theoretical basis for subsequent safe and efficient in future ice drilling engineering.

Abstract:Borehole wall instability is one of the common difficulties in drilling process, especially in the mud shale interval drilling. In view of the complicated conditions of borehole collapse, block falling, drill pipe sticking and borehole diameter enlargement in Shanxi-Taiyuan formation mud shale drilling process in Henan Zhongmu shale gas block, the experimental analysis on the influence factors to borehole stability is carried out in the shale classification, pore permeability characteristics, microstructure, rock mechanics and in-situ stress by using the cores of well MY1. The analysis shows that the mud shale of Zhongmu block belongs to hard-brittle mud shale, the main factors that cause wellbore instability are strong heterogeneity, high rock brittleness and micro fracture development, which are easily lead to wellbore wall mechanical flaking, collapse and block falling. Through the reasonable control of drilling fluid density, optimization of the wellbore structure and drilling parameters and the development of low free water and strong plugging drilling fluid to improve the wellbore stability, good application effect is obtained.

Abstract:The shale hydration and dispersion are the major factor which reasonable for the wellbore instability and the accidents such as tight hole, stuck pipes and borehole collapse. Compare to sodium methylsiliconate, potassium chloride, sodium silicate and potassium silicate, potassium methylsiliconate exhibit better shale inhibition, through clay settlement test, bentonite inhibition tests and linear swelling tests. The shale inhibition mechanism of potassium methyl-silicate was investigated by infrared spectroscopy, X-ray diffraction, water-contact angle and optical microscope. The excellent inhibition effect and collapse preventing of potassium methylsiliconate is attributable to the synergistic effect of potassium cation and hydrophobic membrane structure formed on the surface by methylsiliconate anions.

Abstract:To deal with the various risks of high pressure salt-gypsum layer salt contamination and leakage, blowout, collapse and drill pipe sticking in lower limestone formation of deep horizontal well in Iraq Missan oilfield, as well as to reduce drilling cost and improve drilling efficiency, the research and operation on deep horizontal well are carried out in well 64H. Based on the block operation experience, the deep horizontal well is designed as a 6-spud well structure, the high-density saturated compound salt drilling fluid technology is adopted for high-pressure salt-gypsum layer, and a series of directional well and liner cementing technologies are implemented in deep limestone formation, which solve the drilling technical difficulties in this block, improved the drilling safety and efficiency and created a new drilling record of deep horizontal wells in Missan oilfield.

Abstract:The geothermal exploration hole (combined hole of exploration and mining) is an exploratory construction on the basis of the mining construction technology. This paper mainly introduces the construction problems encountered in the drilling construction and the application of new technology and new process, such as large diameter single pipe coring, well washing by air compressor combined with piston, lowing casings by every other grade, drill pipe tightness test for every 50m since drilling depth of 800m, drill bit sharpening by putting stones into the borehole and drilling in large water inflow formation.

Abstract:In order to overcome drilling difficulties such as the poor drillability and the severe stick-slip vibration in the bouldery formation of the Permian system, as well as the tight, hard and abrasive formation in the Carboniferous system in Xinjiang Oilfield, a multi-dimensional impact tool was used to achieve volumetric rock-crushing, effective control of torque fluctuations, suppression of stick-slip vibration; thus, cutting short of the drilling duration, and reduction of the drilling incidents. The field application shows that the multi-dimensional impact drilling technology can achieve high efficient rock breaking, and increase drilling rates in formation of poor drillability and deep hard rock formation, effectively reducing the drilling cost. It is worthy of further promotion and application in suitable formations.

Abstract:This paper mainly discusses some problems, such as low net drilling rate, frequent downhole incidents, encountered when drilling a hot spring well in alternate soft and hard sandstone/mudstone of the Xujiahe formation in Muchuan County, Southwest Sichuan. A drilling process with sliding and rotary PDM drilling was adopted to tackle the problems, leading to high drilling efficiency and economic benefits. It may provide some experience for large diameter deep hole drilling in the region in the future.

Abstract:Hydraulic borehole mining provides the advantages of short construction period, environmental protection, low mining cost and great working depth, etc. It has a broad application prospect in the exploitation and utilization of the resources at poor and deep mines in China. In this paper, the characteristics of the traditional hydraulic drilling tools are summarized, the influence of the fixed nozzle on the mining efficiency is analyzed, and the research results are introduced. Based on this, a hydraulic borehole mining drill of independent intellectual property rights was developed according to the telescopic manner of the worm and worm wheel. The drilling tool allows the telescopic movement of the hydraulic jetting device and ensures the adjust of the target distance, thereby increasing the single hole mining area and improving the mining efficiency.

Abstract:The drilling rig auxiliary operation platform is mainly used for simulation training of the operator for the drilling rig assembly, so that the operator can quickly be familiar with the operation and usage of the drilling rig, fully master the performance of the assembly and improve the training effect and level. Semi-physical simulation was adopted for development of the drilling rig auxiliary operation platform, namely, the simulation plan is employed, while the operation results are feedback to the trainees through TV or projection display equipment. The real-time simulation equipment completes command control and effect display, the interface equipment completes data acquisition and communication, and the simulation machine realizes virtual drilling rig simulation operation.

Abstract:The main pier of a large bridge is located in the Pearl River. Locked steel pipe piles were used as the enclosure structure for the cushion cap foundation pit of the main pier, with C30 underwater concrete used for bottom-sealing. After bottom-sealing was completed, the confined water level was too high, leading to water kick-in at the bottom of the foundation pit during the cofferdam drainage process. Two solutions were discussed afterwards: the first option was internal dewatering of cofferdam and the second was external dewatering of the cofferdam. After comparison, the second solution was chosen. External dewatering of the cofferdam eliminated successfully the incident and ensured the smooth construction of the pile cap, proving that it is feasible to lower the confined water level in the river. Dewatering is one of the important means to ensure the

Abstract:The pit type static pressure steel tube pile is a technical method to solve soft soil foundation deformation of existing buildings due to subsidence. According to the foundation deformation and geological conditions of the inspection building of Beihuaguan Aluminum Chemical Company LTD. in Shanxi Province, a design was proposed for reinforcement by using pit type static pressure steel pipe piles with the construction schemes, construction processes and notes described. The problems encountered in the construction process are summarized with the monitoring data after construction analyzed. The results show that pit type static pressure steel tube piles are effective for soft foundation reinforcement and can successfully solve cracking of the foundation due to settlement of the soft soil layer.

Abstract:The permeability coefficient determines the estimation of water inflow at deep foundation pits and the type of the water cutting-off curtain, and affects the safety and cost of the project; thus, it is of great significance to the construction of deep foundation pits in water-rich areas. For anisotropic aquifers, it is difficult to find a suitable method to calculate the hydrogeological parameters from the existing analytical formula, especially for the vertical permeability coefficient. A pumping test was carried out on the flow resistance by using the temporary water cutting-off curtain in the field to simulate the dewatering of foundation pits; then, the hydrogeological conceptual model and the groundwater flow mathematical model were established to invert the permeability coefficient of each layer by using a 3D finite difference numerical simulation software; finally, the model was validated by the data of verification pumping; which provided a guiding basis for the design of the envelope of a subway station in the super-thick sand and gravel stratum near the river in Fuzhou. The results of the test and the numerical simulation can be used for reference for similar projects.

Abstract:The trenching construction is an important process for underground diaphragm wall, YCJF20 percussive and reverse circulation rig is used in trenching construction of underground diaphragm wall in a station of Xiamen metro line 3. This paper introduces YCJF20 rig about its main technical parameters, characteristics and working principles, as well as the construction process of guide wall and guide hole, drilling rig layout, mud preparation and trenching by percussive drilling.

Abstract:The construction site of the cast-in-place pile foundation near Shengda University’s complex building in Longhu Town, Xinzheng, Zhengzhou, is located on a complex terrain, and spans an existing slope with an elevation difference of 8.5m. The composite soil nailing wall was used to retain the slope permanently. The grouted pile was used for the down-slope pile with the manual Luoyang shovel used for construction of the upper section of the pile and the direct circulation drilling for the lower section. Horizontally buried PVC pipes were used to make semi-pile circulating holes with the remaining completed by are grouted pile drilling. Good construction results have been achieved, providing reference for similar projects.

Abstract:According to the subsidence of the dumper room in Xinmi Power Plant and the existing foundation treatment, a pressure grouting reinforcement scheme was formulated with proper construction equipment and parameters determined through the trial-hole. In order to address the gravel backfill foundation, sim-casing drilling with the eccentric bit was used to avoid hole collapse and ensure the smooth progress of construction, and alternate grouting ensured good grouting results. The subsidence observation results show that the design and construction scheme is proper and effective, providing a better idea for the treatment of similar projects.

Abstract:In order to cope with drilling challenges in mining, oil and gas industries, the self-lubricating technique in material science has been introduced into the design of hot press sintered impregnated diamond bits (IDB). Such attempt aims to endow IDB with the ability to self-lubricate, so as to reduce frictional heat, prevent diamond thermal damage and improve bit service life. This paper describes an initial design where CaF2 and hBN were selected as solid lubricant additives through optimization and experiments. They were added to Fe-based matrix to prepare two groups of self-lubricating IDB matrix specimens with different lubricant concentrations via hot press sintering. The specimens’ mechanical and tribological properties were tested by a series of testing machines, and the miniature IDB were made and bench-tested. The results show that with the increase in lubricant concentrations, both groups of specimens experienced decrease in their mechanical strengths; however, the degree of such decrease differed among two groups, with hBN group dropping more dramatically. The friction coefficients of both groups dropped significantly, and the wear rate of CaF2 group first rose and then dropped; whereas that of hBN group increased substantially. The drilling footage of CaF2 group rose slightly while hBN group decreased gradually.

Abstract:In view of the dangers of accumulated water in the upper goafs to mining of the lower coal seam in the binary coal seam, it was proposed to drill exploration and drainage holes, plus large diameter pumping wells from surface through the upper multiple goaf areas for water discharge. The application of the process to treat the accumulated water in the Jurassic goaf in the Datong mining area indicated that the exploration and drainage hole can effectively drain water from the goaf to the lower Carboniferous coal seam roadway; while the large diameter pumping well can achieve discharge of the goaf at large flows. A total of 3.981 million m3 of accumulated water in the goaf was drained by the 9 exploration and drainage wells, and more than 2 million cubic meters of accumulated water in the goaf discharged by the 5 large-diameter pumping wells, achieving good drainage results. This paper introduces the application of the exploration and drain well, and large-diameter pumping well drilling processes to the water control of the Jurassic goaf in the Tongmei Group Tongxin Mine, providing reference for the goaf water drainage in the similar mining condition.

Abstract:With increasingly acute competition in the exploration market, it is the trend of the time for the enterprises to adopt advanced management methods to realize the standardization and refinement of project management. As the project is a basic component of an enterprise, the management level reflects the soft power of the enterprise and directly affects the competitiveness of the enterprise in the market. With the deep drilling project in the Zhaoyuan Luanjiahe mining area as the starting point, the 6th Geological Brigade of Shandong Provincial Geological Mineral Exploration & Development Bureau has built a standardized project model by using management knowledge such as 5S and TPM, etc., and achieved certain results which are worthy of promoting.