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- Keyword
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- Numerical simulation (89)
- Coalbed methane (47)
- Coal mine (39)
- Ordos Basin (33)
- Coalbed methane (CBM) (31)
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- Deep learning (28)
- Gas drainage (28)
- Pore structure (28)
- Deep coalbed methane (CBM) (27)
- Permeability (27)
- Deep coalbed methane (25)
- Hydraulic fracturing (23)
- Tar-rich coal (23)
- Directional drilling (21)
- Underground coal mine (20)
- Coal (17)
- Horizontal well (16)
- Qinshui Basin (16)
- Machine learning (14)
- Open-pit coal mine (14)
- Rock burst (14)
- Shale gas (13)
- Underground coal gasification (UCG) (13)
- Fracture (12)
- Mine water (12)
- Prospect (12)
- Fractal dimension (11)
- Helium (11)
- Intelligent mining (11)
- Microstructure (11)
- Publication Year
Articles 1321 - 1350 of 1822
Full-Text Articles in Mining Engineering
An Advanced Co2 Gas-Phase Fracturing Technology For Efficient Methane Drainage, Outburst Prevention And Excavation In Outburst Coal Seam, Yang Baige, Zhang Junsheng, Linghu Jianshe, Cao Yunxing
An Advanced Co2 Gas-Phase Fracturing Technology For Efficient Methane Drainage, Outburst Prevention And Excavation In Outburst Coal Seam, Yang Baige, Zhang Junsheng, Linghu Jianshe, Cao Yunxing
Coal Geology & Exploration
Coal and gas outburst in coal mines is a serious disaster in China. Although the disaster has been reduced significantly over the past 10 years, vicious accidents still occure, causing serious losses to the lives of miners and the safety of coal mines. The current applied technologies for outburst prevention and control include hydraulic fracturing, hydraulic slitting, hydraulic flushing, deep hole blasting, intensive drilling, etc., which have solved the outburst problem and safe excavation in some degrees. Nevertheless, the above-mentioned technologies could not solve the problems of safety excavation in the high gas content and low permeability outburst coal seams. …
Hydrate Reservoir Physical Properties Response And High-Pressure Gas-Water Reverse Penetration During Deepwater Oil And Gas Cementing, Zheng Mingming, Wang Xiaoyu, Zhou Kerui, Wang Kai, Wang Zhilin, Dong Gang, Wei Meng, Liu Tianle, Jia Dongyan
Hydrate Reservoir Physical Properties Response And High-Pressure Gas-Water Reverse Penetration During Deepwater Oil And Gas Cementing, Zheng Mingming, Wang Xiaoyu, Zhou Kerui, Wang Kai, Wang Zhilin, Dong Gang, Wei Meng, Liu Tianle, Jia Dongyan
Coal Geology & Exploration
Well cementing is an important stage during the process of energy extraction. When deep-water oil and gas cementing encounters hydrate formations, the hydration heat of cementing slurry will cause hydrate decomposition in the reservoir near the borehole wall and reverse penetration of high-pressure gas-water. To reduce and avoid the adverse effects of hydrate decomposition, it is critical to clarify the physical response of hydrate reservoirs and the law of high-pressure gas-water reverse penetration under different cementing conditions. In this paper, a two-dimensional cementing numerical model is established according to the SH2 exploration well of GMGS-1 project in Shenhu area in …
Green Detection Method Of Coal Burning Area In Northern Shaanxi Based On Microbial Hydrocarbon Detection Technology, Duan Zhonghui, Ma Li, Hao Chun, Wang Lengyao, Mei Hai
Green Detection Method Of Coal Burning Area In Northern Shaanxi Based On Microbial Hydrocarbon Detection Technology, Duan Zhonghui, Ma Li, Hao Chun, Wang Lengyao, Mei Hai
Coal Geology & Exploration
Coal seams contain all kinds of light hydrocarbons. When coal seams are burned, the integrity of overlying strata is destroyed, which provides a good channel for hydrocarbon escape from the coal seam. This process conforms to the principle of light hydrocarbon microseepage. Then, microseepage associated microbial hydrocarbon detection technology is introduced to test its recognition ability of coal seam burning area. In Haojialiang Coal Mine of Jurassic Coalfield in northern Shaanxi, two survey lines were tested and butane bacteria was selected as microbial detection index. After microbial analysis process such as soil sampling, microbial culture, and colony count, combined with …
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 …
Analysis Of Interlayer Interference In Combined Development Of Coalbed Methane Wells And Discussion On Combined Production Methods：A Case Study Of Shoushan No.1 Coal Mine In Pingdingshan, Xu Yaobo
Coal Geology & Exploration
The combined development of multiple coal seams is a key technology to increase the production of single CBM wells. However, in engineering practice, most coal seams have interlayer interference problems, resulting in an insignificant increase in combined development gas production. In order to improve the gas production and development efficiency of combined development in coalbed methane wells, taking the combined production of coalbed methane in the No.4-2 coal seam and the No.2-1 coal seam of the Shoushan No.1 Coal Mine in Pingdingshan as an example, this paper analyses the influence factors and interference rules of interlayer interference, and proposes the …
Application And Development Of Permanent Magnet Torque Motor In Down-Hole Tools For Oil And Gas Drilling And Production, Li Wei, Deng Lang, Zou Xing, Xia Yang, Chen Xi
Application And Development Of Permanent Magnet Torque Motor In Down-Hole Tools For Oil And Gas Drilling And Production, Li Wei, Deng Lang, Zou Xing, Xia Yang, Chen Xi
Coal Geology & Exploration
Permanent magnet torque motor is a kind of a power driving device with great development potential. It has several advantages, such as high torque density, fast response speed, strong overload capacity, high efficiency and energy saving, therefore, it possesses wide application prospects in many fields in both industrial production and daily life and so on. In view of the current application overview and technical requirements of permanent magnet torque motors in oil and gas drilling and production down-hole intelligent tools, firstly, this paper briefly introduces the structure composition and working principle of permanent magnet torque motor. Then, it elaborates the …
Water Inrush Mechanism Of Thick Alluvium Aquifer With High Pressure Based On The “Bidirectional Fractures” Model In Huainan And Huaibei Mining Area, Liu Qimeng, Liu Yu, Xie Zhigang, Bai Hanying, Fu Xiang, Miao Changjun
Water Inrush Mechanism Of Thick Alluvium Aquifer With High Pressure Based On The “Bidirectional Fractures” Model In Huainan And Huaibei Mining Area, Liu Qimeng, Liu Yu, Xie Zhigang, Bai Hanying, Fu Xiang, Miao Changjun
Coal Geology & Exploration
The coal reserves under Quaternary thick alluvium with high pressure are huge in Huainan and Huaibei Mining Areas. In the process of increasing the upper limit mining near the alluvium, water inrush accidents often occur. However, it is difficult to reasonably explain the mechanism of such accidents by using the traditional aupper three zonesa theory. In this paper, the hydrogeological and engineering geological conditions of thick alluvium with high pressure are analyzed, and the abidirectional fracturesa model is established. Laboratory experiment, numerical simulation, theoretical analysis, and engineering application inspection are used to study the development law of downward infiltration zone …
Classification Method Of Coal And Rock Drillability Based On Mechanical Specific Energy Theory, Xie Zhijiang, Chang Xue, Yang Lin, Pi Yangjun
Classification Method Of Coal And Rock Drillability Based On Mechanical Specific Energy Theory, Xie Zhijiang, Chang Xue, Yang Lin, Pi Yangjun
Coal Geology & Exploration
The drillability classification of the surrounding rock during the drilling process of coal mine gas drainage through the Mechanical Specific Energy(MSE) can provide a basis for the drilling rig to adjust the drilling parameters. Aiming at the problems of difficulty and low efficiency of manual layer identification in the process of gas drainage and drilling, a coal and rock drillability classification method based on MSE as the drillability evaluation index combined with Extreme Learning Machine(ELM) is proposed. A simulation model of PDC bit crushing rock was established by ABAQUS, and the changing law of drilling speed and MSE in the …
Research On The Evolution Law Of Roadway Surrounding Rock Fissure Based On Fractal Dimension, Ding Wanqi, Ma Zhenqian, Zu Ziyin, Xie Hongfei, Yang Wei, Chen Chuan
Research On The Evolution Law Of Roadway Surrounding Rock Fissure Based On Fractal Dimension, Ding Wanqi, Ma Zhenqian, Zu Ziyin, Xie Hongfei, Yang Wei, Chen Chuan
Coal Geology & Exploration
To explore the evolution law of surrounding rock fissures under the influence of horizontal stress and dynamic disturbance in argillaceous roadways, the deformation and failure characteristics of argillaceous roadways, the evolution law of surrounding rock fissures and the fractal evolution characteristics of surrounding rock fissures under dynamic disturbance are studied by such methods as field investigation, numerical simulation and fractal theory analysis, with the 226 track gate of Shanjiaoshu Mine in Panzhou City as the engineering background. The results show that before dynamic disturbance, the expansion range of fracture zone and plastic zone of roadways gradually increases with the increase …
The Origin Of Coal Measure Breccia In Jinggong No.3 Coal Mine, Pingshuo, Shanxi, Shi Yanqiang
The Origin Of Coal Measure Breccia In Jinggong No.3 Coal Mine, Pingshuo, Shanxi, Shi Yanqiang
Coal Geology & Exploration
The genesis and occurrence of coal measure breccia in Jinggong No.3 Coal Mine of Pingshuo are special and closely related to the coal seams. Through core observation of supplementary drilling, combined with regional geology and analysis of previous drilling data, the composition, structure and structural characteristics of breccia in the study area are described in detail, and the horizon, thickness and distribution of breccia are delineated. It is found that the composition of breccia in Jinggong No.3 Coal Mine of Pingshuo is complex, and the size of breccia is different. The maximum diameter of mudstone is more than 1.20 m, …
Experimental Study On The Influence Of Coal-Based Co2 Geological Storage On Roof Fracture Conductivity, Zhu Shiliang, Shao Liwei, Zhou Xiaozhi, Cao Yutong, Zhang Kun, Wang Jiandong
Experimental Study On The Influence Of Coal-Based Co2 Geological Storage On Roof Fracture Conductivity, Zhu Shiliang, Shao Liwei, Zhou Xiaozhi, Cao Yutong, Zhang Kun, Wang Jiandong
Coal Geology & Exploration
Coal-based CO2 geological storage is an important way to reduce greenhouse gas emissions, but there is also a safety risk of underground CO2 leakage. In order to evaluate the safety of coal-based CO2 geological storage, the roof samples of No.3 coal seam in Hudi Coal Mine, southern Qinshui Basin were collected, and the changes of artificial fracture morphology, whole rock mineral composition and CO2 conductivity of columnar samples in "CO2-H2O-Rock" reaction were studied by simulation experiments. The results show that calcite vein dissolution, secondary mineral filling and external effective stress jointly affect …
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 …
Analysis On The Deployment Of Mining Research Supported By The Grant Program Of Deep Resources Exploration And Mining, Fan Jun, Zhang Jialin, Qin Yuan, Wang Hao, Gao Yanan, Pei Yongzhi
Analysis On The Deployment Of Mining Research Supported By The Grant Program Of Deep Resources Exploration And Mining, Fan Jun, Zhang Jialin, Qin Yuan, Wang Hao, Gao Yanan, Pei Yongzhi
Coal Geology & Exploration
The Deep Resources Exploration and Mining(DREAM) grant program, within the framework of The National Key Research and Development Program grants, is a pillar to implement China’s science and technology strategy in the area of deep resources exploitation. To tackle the insufficient of theories and technologies for the 1000-meter-deep mining, a section of mining, covering the research of basic theories, general technologies and application demonstration, was arranged in the layout of DREAM under the principle of "whole chain design, integrated implementation". In the aspect of basic research, DREAM mainly focused on the deep rock mechanics and mining theory, such as the …
Distribution And Enrichment Of Pollutants From Underground Gasification Of Bituminous Coal In Huating Mining Area, Zhu Lihui, Feng Beizhan, Hu Yongxing, Wang Mingzhong
Distribution And Enrichment Of Pollutants From Underground Gasification Of Bituminous Coal In Huating Mining Area, Zhu Lihui, Feng Beizhan, Hu Yongxing, Wang Mingzhong
Coal Geology & Exploration
In order to study the enrichment and distribution of pollutants from the underground gasification of bituminous coal in Huating Mining Area, and to evaluate the environmental factors of the underground gasification of bituminous coal, with an underground gasification simulation experimental platform system, this paper studies the enrichment of heavy metal pollutants in tar and gasification residues during gasification process by means of different oxygen-rich-water gasification experiments and pyrolysis experiments of coal samples in different sizes. The results show that the pyrolytic tar of bituminous coal tends to increase as its size increases, and the yield increases first and then decreases. …
Occurrence Characteristics And Resource Potential Evaluation Of Tar-Rich Coal For No.5-2Coal Seam In Shenfu Mining Area, Li Huabing, Yao Zheng, Li Ning, Gao Jun, Xie Qing, Wang Qiang
Occurrence Characteristics And Resource Potential Evaluation Of Tar-Rich Coal For No.5-2Coal Seam In Shenfu Mining Area, Li Huabing, Yao Zheng, Li Ning, Gao Jun, Xie Qing, Wang Qiang
Coal Geology & Exploration
With the promotion of clean and efficient utilization of coal and the demand for high-quality development in the middle section of the Yellow River, the transformation and upgrading of coal industry is imperative in Yulin, and the exploitation of tar-rich coal one of the important directions. By organizing and making use of mass drill data, and in combination with the minefield underground spot sampling and regional geology, tar-yield characteristics and tar-rich coal occurrence features of tar-rich coal in No.5-2 coal seam in Shenfu Mining Area are analyzed in detail. Based on analytic hierarchy process, this paper takes resource allocation, …
Experimental Study On Multi-Scale Pore Structure Characteristics Of Tar-Rich Coal In Yushenfu Mining Area, Shen Yanjun, Wang Xu, Zhao Chunhu, Wang Shengquan, Guo Chen, Shi Qingmin, Ma Wen
Experimental Study On Multi-Scale Pore Structure Characteristics Of Tar-Rich Coal In Yushenfu Mining Area, Shen Yanjun, Wang Xu, Zhao Chunhu, Wang Shengquan, Guo Chen, Shi Qingmin, Ma Wen
Coal Geology & Exploration
Extracting oil and refining gas from oil-rich coal is an important measure to make up for the shortage of oil and gas supply in China. The research on pore development characteristics and permeability of tar-rich coal will help to better develop and utilize tar-rich coal. Taking the tar-rich coal in Yushenfu mining area as the research object, this paper studies the multi-scale pore structure and the whole segment pore characterization of tar-rich coal by such methods as low-temperature liquid nitrogen adsorption, mercury intrusion porosimetry, nuclear magnetic resonance and gas permeability measurement method. Based on the test results of multi-scale pore …
Effect Of Load On Adsorption Characteristics Of Remolded Coal, Dai Juhua, Wang Zhaofeng, Li Xuechen, Li Yanfei, Yue Jiwei
Effect Of Load On Adsorption Characteristics Of Remolded Coal, Dai Juhua, Wang Zhaofeng, Li Xuechen, Li Yanfei, Yue Jiwei
Coal Geology & Exploration
In view of the difficulty in preparing the coal with broken soft structure intact, it needs to be processed into remolded coal. In order to study the influence of suppression loads on the physical characteristics of coal, the micro-pore structure and adsorption characteristics of remolded coal under different molding loads were discussed based on the pore test experiment of low temperature liquid nitrogen and the methane adsorption experiment of high pressure capacity method. The results show that: The pore volume of micropores and pores decreases slightly with the increase of molding load, the specific surface area increases slightly with the …
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 …
Model Tests On The Red Clay Foundation Reinforced By The Natural Coir Fiber, Li Liangyong, Ma Weidi, Xie Peng, Cao Qian, Huang Ruilong
Model Tests On The Red Clay Foundation Reinforced By The Natural Coir Fiber, Li Liangyong, Ma Weidi, Xie Peng, Cao Qian, Huang Ruilong
Coal Geology & Exploration
Due to the advantages of low cost, good seismic performance, simple construction, etc., reinforcement method has become a common method of foundation improvement. However, the geosynthetic used in the reinforcement method is not natural and environmentally friendly. To solve this problem, the natural coir fiber is used to reinforce the red clay foundation in this paper. The effect of the coir fiber reinforcement depth on the deformation and bearing capacity of the red clay foundation is studied through load tests. The distribution law of the earth pressure along depth is analyzed. The results show that the load bearing ratio increases …
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 …
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 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. …
Prediction Model Of Coalbed Methane Content Based On Well Logging Parameter Optimization, Chen Tao, Zhang Zhansong, Zhou Xueqing, Guo Jianhong, Xiao Hang, Tan Chenyang, Qin Ruibao, Yu Jie
Prediction Model Of Coalbed Methane Content Based On Well Logging Parameter Optimization, Chen Tao, Zhang Zhansong, Zhou Xueqing, Guo Jianhong, Xiao Hang, Tan Chenyang, Qin Ruibao, Yu Jie
Coal Geology & Exploration
With the development of coalbed methane(CBM) exploration, higher accuracy of CBM content prediction is required. Based on the response characteristics of CBM logging, the correlation between logging parameters and gas content is analyzed, and the optimization strategy of logging parameters by combining MIV technology with LSSVM is proposed. The optimal logging parameters are selected as the input independent variables of network modeling, and the core parameters of LSSVM(Least Squares Support Vector Machine) network are optimized by particle swarm optimization. Finally, a set of MIV-PSO-LSSVM model suitable for CBM content prediction is constructed. The prediction performances of LSSVM, PSO-LSSVM, MIV-LSSVM, MIV-PSO-LSSVM …
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 …
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 …
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 …