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Research advances in enhanced coal seam gas extraction by controllable shock wave fracturing

International Journal of Coal Science & Technology 2024年第3期11卷 1-31页

作者： Chaojun Fan Hao Sun Sheng Li Lei Yang Bin Xiao Zhenhua Yang Mingkun Luo Xiaofeng Jiang Lijun Zhou College of Mining Liaoning Technical UniversityFuxin123000China College of Safety Science and Engineering Liaoning Technical UniversityFuxin123000China Energy Business Department Shanxi Lu’an Chemical GroupChangzhi046200China

With the continuous increase of mining in depth,the gas extraction faces the challenges of low permeability,great ground stress,high temperature and large gas pressure in coal *** controllable shock wave(CSW),as a new method for enhancing permeability of coal seam to improve gas extraction,features in the advantages of high efficiency,eco-friendly,and low *** order to better utilize the CSW into gas extraction in coal mine,the mechanism and feasibility of CSW enhanced extraction need to be *** this paper,the basic principles,the experimental tests,the mathematical models,and the on-site tests of CSW fracturing coal seams are reviewed,thereby its future research directions are *** on the different media between electrodes,the CSW can be divided into three categories:hydraulic effect,wire explosion and excitation of energetic materials by detonating *** the process of propagation and attenuation of the high-energy shock wave in coal,the shock wave and bubble pulsation work together to produce an enhanced permeability effect on the coal *** stronger the strength of the CSW is,the more cracks created in the coal is,and the greater the length,width and area of the cracks *** repeated shock on the coal seam is conducive to the formation of complex network fracture system as well as the reduction of coal seam strength,but excessive shock frequency will also damage the coal structure,resulting in the limited effect of the enhanced gas *** the influence of ground stress,the crack propagation in coal seam will be *** difference of horizontal principal stress has a significant impact on the shape,propagation direction and connectivity of the CSW induced *** permeability enhancement effect of CSW is affected by the breakage degree of coal *** shock wave is absorbed by the broken coal,which may hinder the propagation of CSW,resulting in a poor effect of permeability *** arranging two a

关键词： Controllable shock wave Permeability enhancement gas extraction Basic principle Experimental test Mathematical models On-site test

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Effect of damage zone around borehole on carbon dioxide injection promoted gas extraction in soft and low-permeability coal seam

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Frontiers of Earth Science 2023年第3期17卷 776-787页

作者： Lijun ZHOU Xihua ZHOU Gang BAI Xianlin LI Mingkun LUO College of Safety Science and Engineering Liaoning Technical UniversityFuxin 123000China Key Laboratory of Mine Thermodynamic Disasters and Control(Ministry of Education) Fuxin 123000China

Injecting external CO_(2) into soft and low-permeability coal seams can improve CH4 extacctinn efficiency, and also benefit in CO_(2) sequestration. However, the distribution law of damage zone around borehole in soft coal seam and its effect on the efficiency of CO_(2) injection promoted CH4 extraction are not clear. In this paper, a multi-physics coupling mathematical model considering damage effect is established for simulating the process of CO_(2) injection promoted CH4 extraction in soft and low-permeability coal seam. The distribution of damage zone and permeability around boreholes under different diameters and coal strengths are analyzed. The gas pressure and gas content in coal seam during CO_(2) injection promoted CH4 extraction when the model considered damage effect are compared with that of ignored. The results show that small borehole diameter corresponds to narrow damage zone around the borehole in coal seam. The damage zone expands with the increase of the borehole diameter. The damage zone increases exponentially with the borehole diameter, while decreases exponentially with the compressive strength of coal seam. The highest permeability in the damage zone has increased by nearly 300 times under the condition of simulated case. CH4 pressure around the extraction borehole reduces, and the reduction area expands with the increase of time. Compared with the result of considering the damage effect, the reduction area of ignoring it is smaller, and the reducing speed is slower. The integrated effect of CO_(2) injection and CH4 extraction leads to rapid decrease of CH4 content in coal seam near the boreholes. The CO_(2) pressure and content increase around the injection borehole, and the increasing area gradually extends to the whole coal seam. In soft coal seams, failure to consider the damage effect will underestimate the efficiency of CH4 extraction and CO_(2) sequestration, resulting conservative layout of boreholes.

关键词： soft and low-permeability coal seam carbon dioxideinjection gas extraction damageeffect permeability evolution

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Application of deep borehole blasting on fully mechanized hard top-coal pre-splitting and gas extraction in the special thick seam

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International Journal of Mining Science and Technology 2015年第5期25卷 755-760页

作者： Liu Jian Liu Zegong Xue Junhua Gao Kui Zhou Wei State Key Laboratory of Deep Coal Mining & Environmental Protection School of Energy and Safety Anhui University of Science & Technology Key Laboratory of Safety and High-efficiency Coal Mining Ministry of EducationAnhui University of Science & Technology

In order to solve the problems of top-coal inadequate destruction and large amounts of gas emission in mining extra thick and hard coal seam,this study investigated the pre-splitting for deep borehole blasting and gas pre-draining technologies on top *** mechanism of the technologies was systematically expounded based on hard top-coal cracks development obtained by numerical simulation and theoretical *** results show that explosive blasting in the hard rock results in a large number of cracks and large displacement in the rock mass due to the effect of explosion ***,the thick top-coal caves,and desorbing gas flows along the cracks improve gas ***,the pre-splitting for deep borehole blasting and gas pre-draining technologies was applied in No.3802 working face of Shui Liandong Coal Mine,which increases monthly output in the face to 67.34 kt and the drained gas concentration to 86.2%.The drained gas average concentration from each borehole reaches 40%,and the effect is remarkable.

关键词： Deep borehole blasting Fully mechanized mining Hard thick coal seam Top-coal pre-splitting gas extraction

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Theory and practice of integrated coal production and gas extraction

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International Journal of Coal Science & Technology 2015年第1期2卷 3-11页

作者： Liang Yuan State Key Laboratory of Deep Coal Mining & Environment Protection Huainan Mining Group Co. Ltd. Huainan 232001 China

The integrated extraction of coal and gas combines coal mining with gas capture. Taking into account the gas deposition and flow conditions in the Chinese coal basins, this paper describes the status of the theory and key technologies of this integrated extraction system, and presents its application and practice in the Shaqu, Zhongxing, Fenghuangshan and Pingmei mines. Areas for further improvements in future studies are discussed, focusing in particular on the fundamentals of the extraction system to make it greener, more scientific, and more advanced in both the exploitation and utilization of coal and the gas in coal.

关键词： Integrated coal production gas extraction De-stress mining Pillarless mining Circular overlying zone

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Development and application of an efficient gas extraction model for low-rank high-gas coal beds

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International Journal of Coal Science & Technology 2015年第1期2卷 76-83页

作者： Baiquan Lin The State Key Laboratory of Coal Resources and Mine Safety China University of Mining and Technology Xuzhou 221008 China Faculty of Safety Engineering China University of Mining and Technology Xuzhou 221008 China Shaanxi Binchang Mining Group Co. Ltd.Xianyang 721000 China

To promote gas extraction in low-rank high-gas coal beds, the pore structure characteristics of the coal and their effect on gas desorption were studied. The results show that micropores are relatively rare in low-rank coal; mesopores are usually semi-open and inkpot-shaped whereas macropores are usually slit-shaped. gas desorption is relatively easy at high- pressure stages, whereas it is difficult at low-pressure stages because of the ＇bottleneck effect＇ of the semi-open inkpot-shaped mesopores. A ＇two-three-two＇ gas extraction model was established following experimental analysis and engineering practice applied in the Binchang mining area. In this model, gas extraction is divided into three periods： a planning period, a transitional period and a production period. In each period, surface extraction and underground extraction are performed simultaneously, and pressure-relief extraction and conventional extraction are coupled to each other. After applying this model, the gas extraction rate rose to 78.8 %.

关键词： Low-rank coal Pore structure gas extraction Inkpot-shaped pore

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Theory of gas extraction from coal seams and its use

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Journal of Coal Science & Engineering(China) 2012年第3期18卷 276-279页

作者： FAN Xi-sheng Mine Safety Technology Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute) Beijing 100013China

gas extraction is one of the main measures of control and use of gas of coal mines. At present, the design method is under the experimental period and do not satisfy the need of practice. In this paper, the theory of gas extraction of coal seams based upon Darcy law was studied. Mathematical model of gas extraction of coal seams was established and two kinds of solv- ing approaches based on computer software and linear approximation were given. The rightness and the validities of the model were examined with a practical example. Results obtained can be used to determine and optimize the parameters related etc.

关键词： coal seam gas gas extraction linear approximation

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Characteristics of fracture development and gas extraction of a lower protected seam

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Journal of Chongqing University 2009年第4期8卷 239-244页

作者：王海锋 National Engineering Research Center for Coal&gas control China University of Mining&TechnologyXuzhou 221008

To ensure the mining safety of working face in the protective seam and meanwhile extract pressure-relief gas of the lower protected seam and eliminate its outburst risk,the present study researched into fracture development of floor coal-rock mass of the protective seam and migration rule of pressure-relief gas from a protected seam so as to obtain an effective pressure- relief gas extraction *** results show that after the upper protective seam was mined,mining-induced fracturing floor coal-rock mas...

关键词： short distance protective seam gas emission penetration borehole gas extraction

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Key technologies and engineering practices for soft-rock protective seam mining

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International Journal of Mining Science and Technology 2020年第6期30卷 889-899页

作者： Xiang Cheng Guangming Zhao Yingming Li Xiangrui Meng Qingyi Tu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Geological Resources and Geological Engineering Post-Doctoral Flow Station Anhui University of Science and TechnologyHuainan 232001China Post-Doctoral Research Station Huaibei Mining Corporation LimitedHuaibei 235006China

Severe gas disasters in deep mining areas are increasing,and traditional protective coal seam mining is facing significant *** paper proposes an innovative technology using soft rock as the protective seam in the absence of an appropriate coal *** on the geological engineering conditions of the new horizontal first mining area of Luling Coal Mine in Huaibei,China,the impacts of different mining parameters of the soft-rock protective seam on the pressure-relief effect of the protected coal seam were analyzed through numerical *** unit stress of the protected coal seam,which was less than half of the primary rock stress,was used as the mining stress pressure-relief *** optimized interlayer space was found to be 59 m for the first soft-rock working face,with a 2 m mining thickness and 105 m face *** physicochemical characteristics of the orebody were analyzed,and a device selection framework for the soft-rock protective seam was *** equipment for the working face was selected,including the fully-mechanized hydraulic support and coal cutter.A production technology that combined fully-mechanized and blasting-assisted soft-rock mining was *** practices demonstrated that normal circulation operation can be achieved on the working face of the soft-rock protective seam,with an average advancement rate of 1.64 m/*** maximum residual gas pressure and content,which were measured at the cut hole position of the protected coal seams(Nos.8 and 9),decreased to 0.35 MPa and 4.87 m^3/t,*** results suggested that soft-rock protective seam mining can produce a significant gas-control effect.

关键词： gas outburst hazard Soft-rock protective seam Pressure-relief Three-machine optimization Blasting-assisted mining gas extraction

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Elimination mechanism of coal and gas outburst based on geo‑dynamic system with stress–damage–seepage interactions

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International Journal of Coal Science & Technology 2023年第4期10卷 47-61页

作者： Lingjin Xu Chaojun Fan Mingkun Luo Sheng Li Jun Han Xiang Fu Bin Xiao College of Mining Liaoning Technical UniversityFuxin 123000China Energy Business Department Shanxi Lu’an Chemical GroupChangzhi 046200China Resource Department Liaoning Geology Engineering Vocational CollegeDandong 118000China

Coal and gas outburst is a complex dynamic disaster during coal underground *** the disaster mechanism is of great signifcance for accurate prediction and prevention of coal and gas *** geo-dynamic system of coal and gas outburst is *** framework of geo-dynamic system is composed of gassy coal mass,geological dynamic environment and mining *** of stress–damage–seepage interaction for gassy coal mass is constructed to resolve the outburst elimination process by gas extraction with boreholes through layer in foor *** results show the occurrence of outburst is divided into the evolution process of gestation,formation,development and termination of geo-dynamic *** scale range of outburst occurrence is determined,which provides a spatial basis for the prevention and control of *** formation criterion and instability criterion of coal and gas outburst are *** formation criterion F1 is defned as the scale of the geo-dynamic system,and the instability criterion F2 is defned as the scale of the outburst *** to the geo-dynamic system,the elimination mechanism of coal and gas outburst—‘unloading+depressurization’is established,and the gas extraction by boreholes through layer in foor roadway for outburst elimination is *** the research case,when the gas extraction is 120 days,the gas pressure of the coal seam is reduced to below 0.4 MPa,and the outburst danger is eliminated efectively.

关键词： Coal and gas outburst Geo-dynamic system Stress–damage–seepage coupling Elimination mechanism Instability criterion gas extraction

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Research progress on permeability improvement mechanisms and technologies of coalbed deep-hole cumulative blasting

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International Journal of Coal Science & Technology 2020年第2期7卷 329-336页

作者： Deyong Guo Pengfei Lv Jiechao Zhao Chao Zhang School of Emergency Management and Safety Engineering China University of Mining and TechnologyBeijingBeijing100083China Safety Engineering College Beijing Institute of Petrochemical TechnologyBeijing102617China

Coalbed gas extraction is an important means of exploiting and utilizing gas resources,as well as a means of preventing coal mine *** view of the low gas extraction rate from coalbeds with high gas content and low permeability,a method of improving permeability through deep-hole cumulative blasting is applied to develop initial directional fractures using a jet *** the action of the blasting stress wave and detonation gas wedge,the fractures extend over a large range within the coal,thereby improving coalbed *** study focuses on the criteria of cumulative blasting-induced coalbed fracturing based on a literature review of the penetration effect of cumulative *** this basis,we summarize the coal fracturing zone,crack extension process,and the key technologies of charging and hole sealing for cumulative *** addition,the latest research progress in the optimization of field test drilling and blasting parameters for cumulative blasting is *** findings indicate that the permeability improvement mechanism of cumulative blasting could be further enhanced,and the technology and technical equipment are in urgent need of ***,development trends in the cumulative blasting permeability improvement technique are identified.

关键词： Cumulative blasting Fracturing mechanism Coalbed permeability improvement Permeability improvement technology gas extraction

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