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- Keyword
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- Numerical simulation (87)
- Coalbed methane (47)
- Coal mine (39)
- Ordos Basin (29)
- Gas drainage (28)
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- Deep learning (27)
- Pore structure (27)
- Permeability (25)
- Deep coalbed methane (24)
- Hydraulic fracturing (23)
- Tar-rich coal (23)
- Coalbed methane (CBM) (21)
- Directional drilling (20)
- Underground coal mine (19)
- Coal (17)
- Deep coalbed methane (CBM) (17)
- Qinshui Basin (15)
- Horizontal well (14)
- Open-pit coal mine (14)
- Rock burst (14)
- Underground coal gasification (UCG) (13)
- Fracture (12)
- Machine learning (12)
- Prospect (12)
- Shale gas (12)
- Helium (11)
- Intelligent mining (11)
- Mine water (11)
- Advanced detection (10)
- CBM (10)
- Publication Year
Articles 1291 - 1320 of 1775
Full-Text Articles in Oil, Gas, and Energy
Research On Wireline Sealed Coring Equipment And Technology For Coalbed Methane Content Determination, Long Weicheng, Sun Siqing
Research On Wireline Sealed Coring Equipment And Technology For Coalbed Methane Content Determination, Long Weicheng, Sun Siqing
Coal Geology & Exploration
Coalbed methane content is an important technical parameter for the development and utilization of coalbed methane resources and the prevention and control of mine gas. In order to solve the problem of deviation of coalbed methane content measurement results caused by inaccurate estimation of coal core loss gas volume in the process of surface well coalbed methane content determination, the wireline sealing coring device for surface well coal seam is developed, and the wireline sealing coring technology for surface well coal seam is proposed. The upper end of the coal seam wireline sealing coring device is designed with wireline fishing …
Surface Subsidence Control Technology Of Multi-Bed Separation Grouting, Ma Hewen
Surface Subsidence Control Technology Of Multi-Bed Separation Grouting, Ma Hewen
Coal Geology & Exploration
In order to enhance the injection ratio to meet the surface subsidence controlling requirements without obvious thick-and-hard strata in overburden for generating large-scale bed separation, the multi-bed separation grouting method is proposed in this paper. The scale model test is used to study the spatiotemporal evolution of overburden due to multi-bed separation grouting. The field measurements is proven that multi-bed separation grouting can successfully mitigate overburden failure and subsidence by increasing the boreholes number, and multi-bed separation grouting has successfully applied in Huaibei mining area. Filling masses with different diffusion radii are commonly formed in the different bed separation, which …
Mining Subsidence Analysis Of Gently Inclined Coal Seams Based On Flac3d And Dem Data, Gan Zhihui, Shang Hui, Du Rongjun, Zhan Huizhu
Mining Subsidence Analysis Of Gently Inclined Coal Seams Based On Flac3d And Dem Data, Gan Zhihui, Shang Hui, Du Rongjun, Zhan Huizhu
Coal Geology & Exploration
Shizuishan Mining Area in Ningxia Province is located in the western Yellow River. The subsidence of the mined-out area causes frequent surface ecological and environmental problems. The analysis of coal mining subsidence will play a positive role in environmental remediation the Yellow River Basin. Taking Shizuishan Coal Mine as an object to study the evolution characteristics of surrounding rock stress and displacement field of gently inclined coal seam, a three-dimensional numerical model of the gently inclined coal seam based on the numerical simulation software FLAC3D was established. The variation of stress, plastic zone, and displacement in the surrounding rocks …
Variation Law And Influencing Mechanism Of Surface Movement Parameters In Shendong Mining Area, Zhou Tingting, Su Lijuan, Liu Hui, Zhu Xiaojun
Variation Law And Influencing Mechanism Of Surface Movement Parameters In Shendong Mining Area, Zhou Tingting, Su Lijuan, Liu Hui, Zhu Xiaojun
Coal Geology & Exploration
The mining areas in western China generally have the characteristics of large reserves, shallow depth and simple overlying rock structure, and mining activities in such areas have a significant impact on the surface. In order to study the variation law of surface deformation and rock movement parameters in Shendong Mining Area, the dynamic deformation of the surface was studied based on the measured data of working face 22201 of Daliuta Coal Mine. Then the relationship between surface movement parameters and geological mining conditions were obtained from the measured data of 18 working faces in Shendong Mining Area, and the influence …
Targeted Processing Method For Seismic Data Of Karst Caves And Goafs In Nanchuan Area, Meng Qingli, Ren Junxing, Yang Fan
Targeted Processing Method For Seismic Data Of Karst Caves And Goafs In Nanchuan Area, Meng Qingli, Ren Junxing, Yang Fan
Coal Geology & Exploration
In order to solve the problem of poor imaging effect of near surface karst cave and goaf location seismic data in seismic exploration, this paper summarizes the frequency, energy and signal-to-noise ratio characteristics of seismic data in this area using forward modeling combined with actual data analysis. On this basis, a set of corresponding processing methods are proposed, including micro log constrained tomography static correction, weak signal extraction and compensation, pre-stack five dimensional data regularization and structure constrained grid tomography velocity modeling. Through the application in Nanchuan area, the signal-to-noise ratio and wave group continuity of seismic data are obviously …
The Application Of Opposing Coils Transient Electromagnetics In The Detection Of Karst Subsidence Area, Xie Jia, Liu Yang, Li Xingqiang, Lu Yulong, Li Ganlong
The Application Of Opposing Coils Transient Electromagnetics In The Detection Of Karst Subsidence Area, Xie Jia, Liu Yang, Li Xingqiang, Lu Yulong, Li Ganlong
Coal Geology & Exploration
Ground collapse caused by karst is both disastrous and covert. In order to forecast and control it effectively, a research area with strong karst collapse development was selected in this study, and a method that combines Opposing Coils Transient Electromagnetics with engineering geological drilling was used to verify the formation occurrence through the factors including buried depth of overburden, resistivity and isoline variation. The results of geophysical inversion maps and borehole information verification show that the Opposing Coils Transient Electromagnetics method can effectively identify the development of underground corrosion. Especially in the area where the conventional geophysical exploration methods may …
The Development Of A Single-Component Non-Cable Seismograph In Underground Coal Mines, Li Yuan
The Development Of A Single-Component Non-Cable Seismograph In Underground Coal Mines, Li Yuan
Coal Geology & Exploration
In-seam wave seismic exploration, featured in wide detection range and high accuracy, plays an increasingly important role in the refined exploration of coal geological structures. However, most seismic exploration equipment is bulky, with a large number of cables are laid in construction, leading to low efficiency and high construction cost. This seriously restricts the development of high-precision in-seam wave seismic exploration technology in underground coal mines. Based on the design concept of nodal seismograph, the moving coil geophone is integrated into a complete cavity with the acquisition and control circuit, the time precision keeping circuit and the power supply circuit. …
Feasibility Study On The Principle Of Punching-Shearing Composite Rock Fragmentation Mode Of Connecting Holes In Rock Strata, Wang Chuanliu
Feasibility Study On The Principle Of Punching-Shearing Composite Rock Fragmentation Mode Of Connecting Holes In Rock Strata, Wang Chuanliu
Coal Geology & Exploration
Replacing roadway with borehole is an important research direction of underground coal mine drilling technology, which has the advantages of high efficiency and low cost. However, in the construction of large diameter connecting holes in rock strata, the multi-stage reaming method has such problems as long lifting and drilling time and low efficiency of hole formation. This paper proposes the principle of punching-shearing composite rock fragmentation through structural and technological innovation without changing the configuration of drilling equipment. It is a creative combination of punching rock fragmentation of high-pressure water-impactor-inner bit rock and shearing rock fragmentation of drilling rig-drilling pipe-outer …
Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan
Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan
Coal Geology & Exploration
Using shearer as a source, seismic-while-mining(SWM) technology has realized dynamic, accurate and green intelligent detection in fully mechanized mining faces, and can be used to detect static geological anomaly and dynamic mining geological disasters within the work face. Conventional SWM observation system has the defect of blind area. To solve this problem, a new observation system with detectors installed in both roadway and within boreholes are proposed, which effectively improved the imaging range. Based on seismic interferometry principle, using frequency domain correlation algorithm, this paper turns the SWM signal to explosive source signal, and computes the equivalent shot sets. In …
The Application Of Pneumatic Directional Drilling Technology In Gas Pre-Drainage Of Strips In Soft Coal Seams, Zhang Jie
Coal Geology & Exploration
It is costly and inefficient to drill through floor tunnel to eliminate outburst in soft coal roadway strip in Huaibei Mining Area. The bedding pneumatic directional borehole technology can accurately control the borehole trajectory in the strip coal seam according to the design, and realize the outburst elimination of the strip coal roadway through drilling gas extraction. Based on soft coal seam characteristics of the Huaibei Mining Area, the coal lane stripes drainage of gas in the directional hole design, selection of pneumatic directional drilling equipment, directional bore blastholes and shield technology, the evaluation of extraction effect are studied. The …
Prediction Of Coal Seam Gas Content Based On Abc-Bp Model, Zang Zijing, Wu Haibo, Zhang Pingsong, Dong Shouhua
Prediction Of Coal Seam Gas Content Based On Abc-Bp Model, Zang Zijing, Wu Haibo, Zhang Pingsong, Dong Shouhua
Coal Geology & Exploration
It is valuable to exploit the coalbed-methane which is rich in our country. The prediction of gas content in coalbed methane reservoir is a key step in the early stage of development and utilization. In recent years, BP neural network algorithm has been often used in coalbed methane prediction, but the model has some shortcomings in the training process, such as slow convergence speed, sensitive to initial value and easy to fall into local minimum value. Therefore, this paper proposed an improved BP neural network prediction model characterized by artificial bee colony algorithm. Firstly, R-type cluster analysis was used to …
Beneficial Cbm Area Prediction Based On Structural Elemental Quantitative Cluster Classification, Liu Jing, Chang Suoliang, Liu Zuiliang, Zhang Sheng, Chen Qiang, Liu Bo
Beneficial Cbm Area Prediction Based On Structural Elemental Quantitative Cluster Classification, Liu Jing, Chang Suoliang, Liu Zuiliang, Zhang Sheng, Chen Qiang, Liu Bo
Coal Geology & Exploration
In order to select optimally the CBM-enriched area of structural elements and delicately divide the advantageous blocks of CBM structural control under the development scale, this paper takes the Yongle south block in the southwest of Qinshui Basin as an example, subdivides the structural characterization elements and quantifies the indicators of structural elements, and puts forward the method of trend surface iteration to characterize different degrees of structural deformation, fuzzy clustering classification and element dichotomy to optimize the favorable area of CBM structural control. Based on the comprehensive interpretation results of seismic geology, the quantitative characterization of structural elements of …
Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu
Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu
Coal Geology & Exploration
It is of great significance to carry out the research on rock high temperature damage information identification for geothermal development and underground coal gasification. Based on the changes of acoustic emission parameters RA and AF in the failure process of sandstone after different high temperature treatments, the development and evolution law of different types of cracks in sandstone after high temperature treatment are studied. The results show that tensile cracks are dominant in the whole loading process of sandstone. When the loading stress exceeds 80% of the peak stress, the proportion of shear cracks increases rapidly, which can be regarded …
Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu
Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu
Coal Geology & Exploration
The eastern mining area of China is an important coal and grain composite production area. Due to the flat terrain and high underground diving level, most of the subsidence caused by mining is perennial or seasonal water, which causes serious land, ecological and environmental problems. As an important part of the ecological environment in mining area, vegetation has dynamic characteristics due to the external disturbance and the change of environmental factors. The normalized difference vegetation index(NDVI) is a common indicator for remote sensing monitoring of vegetation growth. The analysis based on NDVI time series data can effectively reveal the disturbance …
Research On The Grouting And Setting Pressure Of The Automatic Hole Sealing Device In Underground Coal Mine, Li Chengcheng, Wang Yi, Wang Li, Duan Huijun
Research On The Grouting And Setting Pressure Of The Automatic Hole Sealing Device In Underground Coal Mine, Li Chengcheng, Wang Yi, Wang Li, Duan Huijun
Coal Geology & Exploration
Grouting pressure and setting pressure are the main parameters for designing an automatic hole sealing device in coal mine, and they are also the important basis for the design of automatic hole sealing construction. Based on the radial sealing range of the slurry, the paper analyzes the sealing effect under different slurry pressure conditions by means of theoretical calculation and numerical simulation. Combined with the mechanical characteristics of the rubber Mooney-Rivlin model, extrusion seal and other principles, the optimal injection pressure and setting pressure are studied and determined. The results show that the radial sealing range of the slurry at …
Numerical Simulation Of Safe Distance Through Roadway Drilling Under Dynamic Load Of Large Diameter Rescue Well, Li Bizhi, Hao Shijun, Liu Mingjun, Zhang Qiang, Bai Gang, Mo Haitao
Numerical Simulation Of Safe Distance Through Roadway Drilling Under Dynamic Load Of Large Diameter Rescue Well, Li Bizhi, Hao Shijun, Liu Mingjun, Zhang Qiang, Bai Gang, Mo Haitao
Coal Geology & Exploration
Aiming at the sudden inburst of formation water and drilling fluid into a roadway along the borehole during through roadway drilling operation, which results in the secondary injury of the trapped personnel, ABAQUS geotechnical numerical simulation method was adopted, the model was established with the surface rescue well of the roadway of No.3 coal seam in Pingshang Coal Mine as an example, the plastic deformation characteristics of the surrounding rock of the roadway roof and the optimization of safe through roadway distance under drilling dynamic disturbance were studied. The results show that the dynamic disturbance caused displacement deformation and plastic …
Practice Of Enhanced Gas Extraction By Staged Fracturing With Comb-Shaped Long Hole In Coal Mine Roof, Jia Bingyi, Chen Dongdong, Wu Jie, Sun Siqing, Wang Jianli, Zhao Jizhan, Zhang Jie
Practice Of Enhanced Gas Extraction By Staged Fracturing With Comb-Shaped Long Hole In Coal Mine Roof, Jia Bingyi, Chen Dongdong, Wu Jie, Sun Siqing, Wang Jianli, Zhao Jizhan, Zhang Jie
Coal Geology & Exploration
In order to solve the problems of drilling construction difficulty, low gas drainage concentration, poor drainage effect and inability to realize the predrainage of large area, based on the existing directional drilling technology and hydraulic fracturing technology in coal mines, combined with the previous research results, the staged hydraulic fracturing technology of comb-shaped long borehole in roof was proposed, and the field test was carried out in Sangshuping No.2 well in Hancheng mining area.The test results show that the main hole length of comb-shaped hole in roof was 588 m, including 8 branch holes, the total drilling footage was 1 …
Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue
Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue
Coal Geology & Exploration
Underground coaxial heat exchanger(UCHE) for medium-deep geothermal has the characteristic of the high heat transfer capacity and outlet water temperature, so it has attracted great attention in the heating industry. However, the current research mainly focus on the heat transfer performance of the UCHE during a single heating period, with insufficient analysis on the long-term heat transfer performance. In this paper, considering the operation characteristics of heat supply in heating season and stopping working in non-heating season for underground coaxial heat exchanger for medium-deep geothermal, a numerical heat transfer model is proposed based on the energy conservation equation. The numerical …
Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei
Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei
Coal Geology & Exploration
In order to study the influence of deep geothermal energy development on the flow field of thermal reservoir, deep geothermal energy development in Lankao County is selected as the research object. The geological structure and regional structure of the study area since Cenozoic are analyzed, and the of geothermal exploitation and existing problems in the area are investigated. According to the types of geothermal energy, the characteristics of the Quaternary(Q), Neogene Minghuazhen Formation(N2) and Neogene Guantao Formation(N1) are analyzed. The conditions of fault distribution, thermal reservoir development and water-resisting boundary in the area are found out …
Rock Breaking Mechanism Of Composite Impact Of Full-Size Pdc Bit Based On Finite Element Analysis, Peng Xu, Hao Shijun
Rock Breaking Mechanism Of Composite Impact Of Full-Size Pdc Bit Based On Finite Element Analysis, Peng Xu, Hao Shijun
Coal Geology & Exploration
In order to solve the problems of low rock breaking efficiency in hard formation and the decrease of bit life caused by stick-slip vibration of drilling tools, the full-size bit composite impact rock breaking mechanism was studied by finite element method(ANSYS). The effects of impact frequency, WOB(weight on bit) and rotational speed on the efficiency of rock breaking were analyzed. It was found that both tensile and compressive stresses existed in rock during bit rock breaking, and rock failure was manifested in comprehensive failure of “tensile & compressive shear”. It is concluded that under the condition of torsional impact frequency …
Numerical Simulation Of The Influence Of No-Flow Recharge Aquifer On Cbm Drainage, Liu Bing, Zhang Songhang, Tang Shuheng, Wang Pengfei, Zhai Jiayu, Ji Chaoqi
Numerical Simulation Of The Influence Of No-Flow Recharge Aquifer On Cbm Drainage, Liu Bing, Zhang Songhang, Tang Shuheng, Wang Pengfei, Zhai Jiayu, Ji Chaoqi
Coal Geology & Exploration
Coalbed methane wells in southern Qinshui Basin have the characteristics of high water yield and low gas yield, while some wells present high water yield and high gas yield characteristics. Generally speaking, the high water yield of coalbed methane wells is mostly related to the aquifer with recharge. In this case, based on the coal reservoir geological condition of Shizhuangnan Block and the actual situation of coalbed methane vertical well production, the influence of non-flow recharge aquifer on reservoir pressure variation and CBM outflow rule was simulated by using a three-dimensional coal reservoir simulation software (SIMEDWin) with gas and water …
Table Of Contents, The Editors
Progress Of Coal Fines Agglomeration And Settlement Mechanism Based On High Efficiency Coalbed Methane Drainage, Li Yong, Han Wenlong, Wang Yanbin, Meng Shangzhi, Wu Xiang, Wang Zhuangsen, Ma Zhentao, Liu Du, Zhao Shihu
Progress Of Coal Fines Agglomeration And Settlement Mechanism Based On High Efficiency Coalbed Methane Drainage, Li Yong, Han Wenlong, Wang Yanbin, Meng Shangzhi, Wu Xiang, Wang Zhuangsen, Ma Zhentao, Liu Du, Zhao Shihu
Coal Geology & Exploration
Significant low-yield and inefficient wells seriously hinder the development of China’s coalbed methane (CBM) industry, and the coal fractures and production pipes blocking caused by the coal fines settlement are the key influencing factors. This paper systematically investigates the latest research progress in the composition, generation mechanism, suspension transport and output control of coal fines produced by coalbed methane wells at home and abroad, summarizes the control mechanism and key issues of coal fines agglomeration-settlement and dispersion behavior, and proposes research prospects. The coal fines problem accompanies the entire process of CBM exploration and development, involving all aspects of geological …
Study On The Main Controlling Geological Factors Of High Yield Deep Cbm In Southern Yanchuan Block, Gao Yuqiao, Li Xin, He Xipeng, Chen Zhenlong, Chen Gang
Study On The Main Controlling Geological Factors Of High Yield Deep Cbm In Southern Yanchuan Block, Gao Yuqiao, Li Xin, He Xipeng, Chen Zhenlong, Chen Gang
Coal Geology & Exploration
The Southern Yanchuan Block belongs to a deep, high-rank coalbed methane(CBM) reservoir. Due to the influence of geological conditions, the single well productivity varies greatly. Researching on the main controlling geological factors and their changing mechanism of CBM accumulation, combined with the dynamic data of CBM development, the main controlling geological factors of the CBM well enrichment and high production are analyzed. The research results show that the productivity of the gas field is controlled by the geological factors of “tectonic, hydrology, coal structure”. Tectonic restricts the accumulation of CBM; the degree of salinity characterizes affects the preservation of CBM; …
Optimization On Particle Size Fraction Of Lightweight Coated Ceramsite Proppant In Coal Reservoir, Chang Xiaoliang, Lyu Runsheng, Wang Peng, Li Bing, Gao Lin
Optimization On Particle Size Fraction Of Lightweight Coated Ceramsite Proppant In Coal Reservoir, Chang Xiaoliang, Lyu Runsheng, Wang Peng, Li Bing, Gao Lin
Coal Geology & Exploration
Hydraulic fracturing is currently one of the main technical measures for enhancing coal reservoirs permeability. The spreading range and transportation distance of proppants in the fracture is an important indicator of hydraulic fracturing to evaluate fracturing effect. According to the characteristics of coal reservoirs in Lu’an mining area, physical experiments and numerical simulation methods are used to compare and analyze the effects of fracture conductivity, sand spreading range, particle size combination and other factors on conductivity of coalbed methane wells, and the best proppants particle size and particle size ratio are selected. The research results indicate that the fracture conductivity …
Geological Unit Division And Development Countermeasures Of Deep Coalbed Methane In Southern Yanchuan Block, Chen Zhenlong
Geological Unit Division And Development Countermeasures Of Deep Coalbed Methane In Southern Yanchuan Block, Chen Zhenlong
Coal Geology & Exploration
Deep coalbed methane resources have great potential, accounting for 62.8% of the total resources. However, effective development faces many challenges such as strong heterogeneity, high geostress, difficult process matching and low production capacity. Taking the deep coalbed methane in Southern Yanchuan Block as an example, the key parameters are overlaid and analyzed, the development geological units of the gas field are finely divided according to the five controlling factors of “sedimentation coal-control, tectonic influenced accumulation, hydrodynamic gas-control, geostress seepage-control, physical property production-control”. The key geological attributes and development constraints of each development geological unit are clarified, and the differentiated development …
Causes For Low Cbm Production Of Vertical Wells And Efficient Development Technology In Northern Zhengzhuang Block In Qinshui Basin, Jia Huimin, Hu Qiujia, Fan Bin, Mao Chonghao, Zhang Qing
Causes For Low Cbm Production Of Vertical Wells And Efficient Development Technology In Northern Zhengzhuang Block In Qinshui Basin, Jia Huimin, Hu Qiujia, Fan Bin, Mao Chonghao, Zhang Qing
Coal Geology & Exploration
In order to realize the efficient development of deep CBM in the north of Zhengzhuang block in Qinshui Basin, firstly, the geological conditions and development data of coal reservoir are deeply analyzed, and the development data of shallow CBM are compared. Secondly, based on the evaluation of gas content, the difficulty of coalbed methane recovery is evaluated by comprehensive evaluation of reservoir permeability, reservoir-desorption pressure difference, coal structure and in-situ stress state-Finally, the reasons for low production of CBM wells in the northern Zhengzhuang Block are clarified, and the adaptive technology for efficient development is put forward. The results show …
Numerical Simulation And Test Of Gas Drainage With Water Jet Layered Pressure Relief And Permeability Enhancement In Soft Coal Seam, Liu Xiao, Li Yong, Xuan Dequan, Hu Shixiong, Jing Tianxiang, Xu Sen
Numerical Simulation And Test Of Gas Drainage With Water Jet Layered Pressure Relief And Permeability Enhancement In Soft Coal Seam, Liu Xiao, Li Yong, Xuan Dequan, Hu Shixiong, Jing Tianxiang, Xu Sen
Coal Geology & Exploration
Hydraulic punching is the main technical measure to enhance permeability and drainage of coal seam gas. The pressure relief effect is mainly evaluated by the coal output. However, there are some problems such as large coal output, uneven pressure relief and easy stress concentration. Therefore, this paper puts forward the soft coal interlayer water jet layered pressure relief and permeability increasing gas drainage technology. Considering the influence of gas pressure compression and coal matrix adsorption gas expansion on the coal mass deformation, a multiphysics theoretical model under the coupling condition of stress field, fracture field and seepage field was established. …
The Enrichment And High Yield Law Of Cbm In Yanjiao Syncline In Zhijin Block, Guizhou Province, Guo Tao
The Enrichment And High Yield Law Of Cbm In Yanjiao Syncline In Zhijin Block, Guizhou Province, Guo Tao
Coal Geology & Exploration
In view of the problems such as the large number of coal seams, the thin single layer, the complex structure, much mylonite coal and hard to evaluate favorable area in southern China, this paper makes use of the exploration achievements and tests data of Zhijin Block to study the reservoir-forming conditions of multiple coal seam CBM. The results show that the enrichment and high yield CBM in south China is characterized by “sedimentation storage-control, preservation gas-control, geostress coal structure control production”. The thickness, number and quality of coal are controlled by sedimentation, which determines the resource base of coal bed …
New Mathematical Model And Key Parameters Of Capillary Pressure Curves Of High-Rank Coal Samples, Chen Ke, Tang Lei, Yin Chao, He Wei, Zhang Wei, Quan Zheng
New Mathematical Model And Key Parameters Of Capillary Pressure Curves Of High-Rank Coal Samples, Chen Ke, Tang Lei, Yin Chao, He Wei, Zhang Wei, Quan Zheng
Coal Geology & Exploration
Capillary pressure is an important parameter that affects the occurrence and development of coalbed methane. In order to establish an effective mathematical model to characterize capillary pressure curves of high-rank coalbed methane reservoirs, coal samples from No.3 coal seam in southern Qinshui Basin was taken as the research object, high-pressure mercury intrusion experiments were carried out, and the adaptability of the typical mathematical models of the capillary pressure curve currently in common use are systematically evaluated. Then a new mathematical model with higher fitting degree for high-rank coal is established. The results show that capillary pressure curves of 6 coal …