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The impact of depositional environment and tectonic evolution on coalbed methane occurrence in West Henan, China

International Journal of Mining Science and Technology 2019年第2期29卷 297-305页

作者： Zhaodan Cao baiquan lin Ting Liu China University of Mining and Technology Department of Energy and Mineral Engineering The Pennsylvania State University University Park

A deeper understanding of the mechanisms by which geological factors(depositional environment and tectonic evolution) control the occurrence of coalbed methane(CBM) is important for the utilization of CBM resources via surface-drilled wells and the elimination of coal-methane outbursts, the latter of which is a key issue for coal mine safety. Based on drill core data, high-pressure isothermal adsorption experiments, scanning electron microscopy experiments, mercury intrusion porosimetry, and X-ray diffraction experiments, the impact of the depositional environment and tectonic evolution on CBM occurrence of the II-1 coal seam of the Shanxi Formation in West Henan was analyzed. Results showed that the depositional environment led to the epigenetic erosion of tidal flat coal-accumulating structures by shallow-delta distributary channel strata. This resulted in the replacement of the original mudstonesandy mudstone coal seam immediate roof with fine-to-medium grained sandstones, reducing methane storage capacity. Epigenetic erosion by the depositional environment also increased coal body ash content(from 6.9% to 21.4%) and mineral content, filling the cleat system and reducing porosity, reducing methane storage capacity. The maximum methane adsorption capacity of the coal body reduced from35.7 cm3/g to 30.30 cm3/g, and Langmuir pressure decreased from 1.39 MPa to 0.909 MPa. Hence, the methane adsorption capacity of the coal body decreased while its capacity for methane desorption increased. Owing to the tectonic evolution of West Henan, tectonically deformed coal is common; as it evolves from primary cataclastic coal to granulitic coal, the angle of the diffraction peak increases, d002 decreases, and La, Lc, and Nc increase; these traits are generally consistent with dynamic *** is accompanied by increases in the total pore volume and specific surface area of the coal body, further increasing the capacity for methane storage. Increases in micropore volume

关键词： Coalbed methane Depositional environment Tectonic evolution Epigenetic erosion Tectonically-deformed coal

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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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Mechanical criterion for coal and gas outburst:a perspective from multiphysics coupling

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International Journal of Coal Science & Technology 2021年第6期8卷 1423-1435页

作者： Ting Liu baiquan lin Xuehai Fu Ang Liu School of Safety Engineering China University of Mining&TechnologyXuzhou 221116China Key Laboratory of CBM Resources and Dynamic Accumulation Process China University of Mining&TechnologyXuzhou 221008China Department of Energy and Mineral Engineering G3 Center and EMS Energy InstituteThe Pennsylvania State UniversityUniversity ParkPAUSA

Although a series of hypotheses have been proposed,the mechanism underlying coal and gas outburst remains *** the low-index outbursts encountered in mining practice,we attempt to explore this mechanism using a multiphysics coupling model considering the effects of coal strength and gas mass transfer on *** on force analysis of coal ahead of the heading face,a risk identification index C_(m)and a critical criterion(C_(m)≥1)of coal instability are *** to this criterion,the driving force of an outburst consists of stress and gas pressure gradients along the heading direction of the roadway,whereas resistance depends on the shear and tensile strengths of the *** results show that outburst risk decreases slightly,followed by a rapid increase,with increasing vertical stress,whereas it decreases with increasing coal strength and increases with gas pressure *** the response surface method,a coupled multi-factor model for the risk identification index is *** results indicate strong interactions among the controlling ***,the critical values of the factors corresponding to outburst change depending on the environment of the coal seams,rather than being *** the buried depth of a coal seam increases,the critical values of gas pressure and coal strength decrease slightly,followed by a rapid *** to its controlling factors,outburst can be divided into stress-dominated,coal-strength-dominated,gas-pressure-dominated,and multi-factor compound *** on this classification,a classified control method is proposed to enable more targeted outburst prevention.

关键词： Coal and gas outburst Critical criterion Multiphysics coupling Response surface method

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Monte Carlo simulation of methane molecule adsorption on coal with adsorption potential

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International Journal of Mining Science and Technology 2014年第1期24卷 17-22页

作者： Li Xijian lin baiquan Xu Hao School of Mining Guizhou University School of Safety Engineering China University of Mining & Technology

The paper presents a Monte Carlo simulation to study the adsorption characteristics of methane molecule on coal slit pores from different ***,a physical model of adsorption and desorption of methane molecules on micropores was ***,a grand canonical ensemble was introduced as the Monte Carlo simulation ***,based on the model and system,the molecule simulation program was developed with VC++6.0 to simulate the isothermal adsorption relationship between the amount of molecule absorption and the factors affecting ***,the numerically simulated results were compared with measured results of adsorption coal samples of two different coal mines with a laboratory gas absorption *** results show that the molecule simulations of the adsorption constants,the adsorption quantity,and the isothermal adsorption curve at the same and different coal temperatures were in good agreement with those measured in the experiments,indicating that it is feasible to use the established model and the Monte Carlo molecule simulation to study the adsorption characteristics of methane molecules in coal.

关键词： Methane Adsorption Molecular simulation Slit pore Isothermal adsorption curve

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Strata movement and stress evolution when mining two overlapping panels affected by hard stratum

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International Journal of Mining Science and Technology 2019年第5期29卷 691-699页

作者： Jianguo Zhang Wei Yang baiquan lin Jinjing Zhang Man Wang State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan 467000China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China China Pingmei Shenma Group Pingdingshan 467000China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

Mining causes stress redistribution and stratum *** this paper,a numerical model was built according to the geological conditions in the 12th coal mine in Pingdingshan city to study the strata movement and the evolution of stress when mining two overlapping longwall panels,named panels#14 and#*** strata close to the mined panel move directly towards the gob,while the strata that are farther away swing back and forth during the mining *** directed movement and swinging can break the transverse boreholes for gas extraction;a surface borehole should not be within the range of directional *** stress evolution suggested that the mining of the lower panel#15 after the upper panel#14 would further increase the de-stressed range,while the stress concentration around the mined panel would be *** strata usually carry a greater stress than adjacent rocks and soft coal *** stress in a hard stratum increases greatly,and the stress decreases greatly in the coal seams below the hard *** study supplies a reference for similar coal mines and is useful for determining the de-stressed range and transverse borehole arrangement for gas extraction.

关键词： Stratum movement Mining Longwall panel Hard stratum

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A simple method for solving unidirectional methane gas flow in coal seam based on similarity solution

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International Journal of Mining Science and Technology 2018年第2期28卷 331-334页

作者： Zhou Yan Meng Qian lin baiquan Qin Jilong Zhou Guiping Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining & Technology) Ministry of Education School of Computer Science and Technology Jiangsu Normal University

The equation used to model the unidirectional flow of methane gas in coal seams is usually formulated as a nonlinear partial differential equation, which needs to be solved numerically with a computer ***, for people without access to the computer program, the conventional numerical method may be inconvenient. Thus, the objective here is to seek some method simpler than the conventional one for solving the flow problem. A commonly used model of the unidirectional methane gas flow is considered, where the methane adsorption is described by the Langmuir isotherm and the free gas is treated as real gas. By introducing the similarity solution, a simple method for solving the flow model is proposed, which can be done on a hand calculator. It is shown by two examples that the gas pressure profile obtained by the proposed method agrees well with the direct numerical solution of the flow model.

关键词： Coalbed methane Migration Unidirectional flow Similarity solution Simplified solving Numerical method

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Pulsating hydraulic fracturing technology in low permeability coal seams

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International Journal of Mining Science and Technology 2015年第4期25卷 681-685页

作者： Wang Wenchao Li Xianzhong lin baiquan Zhai Cheng School of Civil Engineering Tianjin University School of Energy Science and Engineering Henan Polytechnic University School of Safety Engineering China University of Mining and Technology

Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger movement and the mechanism of pulsating pressure formation using theoretical research, mathematical modeling and field testing. We analyze the effect of pulsating pressure on the formation and growth of fractures in coal by using the pulsating hydraulic theory in hydraulics. The research results show that the amplitude of fluctuating pressure tends to increase in the case where the exit is blocked, caused by pulsating pressure reflection and frictional resistance superposition, and it contributes to the growth of fractures in coal. The crack initiation pressure of pulsating hydraulic fracturing is 8 MPa, which is half than that of normal hydraulic fracturing; the pulsating hydraulic fracturing influence radius reaches 8 m. The total amount of gas extraction is increased by 3.6 times, and reaches 50 LJmin at the highest point. The extraction flow increases greatly, and is 4 times larger than that of drilling without fracturing and 1.2 times larger than that of normal hydraulic fracturing. The technology provides a technical measure for gas drainage of high gas content and low permeability in the single coal bed.

关键词： Gas drainage Pulsating hydraulic fracturing Fatigue damage Permeability improvement

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Effect of roadway turnings on gas explosion propagation characteristics in coal mines

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Mining Science and Technology 2011年第3期21卷 365-369页

作者： Zhu Chuanjie lin baiquan Ye Qing Zhai Cheng State Key Laboratory of Coal Resources and Safe Mining Xuzhou 221008 China Faculty of Safety Engineering China University of Mining ＆ Technology Xuzhou 221116 China Faculty of Energy and Safety Engneering. Hunan University of Science and Technology Xiangtan 411201 China

In order to reveal the effect of turnings on explosion propagation, experiments were performed in three different pipes （single bend, U-shaped pipe and Z-shaped pipe）. Flame and pressure transducers were used to track the velocity at the explosion front. When the pipes were filled with methane, the explosion strength was significantly enhanced due to the turbulence induced by increasing the number of turnings, while the flame speed （Sf） and peak overpressure （ΔPmax） increased dramatically. In addition, the strength of the explosion increased in violence as a function of the number of turnings. However, when the bend was without methane, the turnings weakened the strength of the explosion compared with the ordinary pipe, shown by the decrease in the values of ΔPmax and Sf. In addition, the propagation characteristics in a U-shaped pipe were similar to those in a Z-shaped pipe and the values of APmax and Sf were also close. The results show that the explosion propagation characteristics largely depend on gas distribution in the pipes and the number of turnings. The different directions of the turnings had no effect.

关键词： Gas explosion Turning Flame speed Peak overpressure Explosion propagation

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Establishment and application of drilling sealing model in the spherical grouting mode based on the loosing-circle theory

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International Journal of Mining Science and Technology 2012年第6期22卷 882-885页

作者： Hao Zhiyong lin baiquan Gao Yabin Cheng Yanying State Key Laboratory of Coal Resources & Mine Safety School of Safety Engineering China University of Mining & Technology

There are quite a few studies that have been done on borehole sealing theory both domestically and *** existing researches usually consider drilling of the surroundings as a dense homogeneous elastic body which does not meet the characteristics of real drilling of the fractured *** on the loosing-circle theory and analyses of the surrounding rock stress field,cracks and seepage fields,combined with Newtonian fluid spherical grouting model,we deduced the dynamic relationship between the seepage coefficient and rock or grouting parameters of the drilling sealing fluid mode of spherical fissure *** this experiment,mucus was injected in the simulated coal seam and the permeability coefficient of the sealing body was calculated by using the *** verify the validity of the model,the calculated sealing body number was compared with the extreme negative pressure that the sealing body could *** theoretical model revealed the drilling sealing fluid mechanism,provided a method for the quantitative calculation of the drilling sealing fluid effect by grouting mode and a reference for the subsequent research of sealing mechanism.

关键词： Drilling Sealing Loosing-circle Grouting

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Pressure-relief and permeability-increase technology of high liquid–solid coupling blast and its application

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International Journal of Mining Science and Technology 2014年第1期24卷 45-49页

作者： Hao Zhiyong Zhou Chao lin baiquan Pang Yuan Li Ziwen State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology

As for the coal seam with high stress,high gas and low permeability,a single technology cannot prevent the complex dynamic *** of this,the study proposes a new method of pressure-relief and permeability-increase technology of the high liquid–solid coupling *** coal seam injection and charging structure change,the paper fully works out the dual functions of the water and *** the theoretical calculation,numerical simulation and physical experiments,we obtained that the initial blasting stress,displacement and overpressure of the liquid–solid coupling blast are much better than that of ordinary *** technology has been used in the relative coal mine,and the application results show that the technique has effectively prevented the coal and gas outburst,which has a wide range of application.

关键词： High stress High gasLow permeability coal seamLiquid-solid coupling blast

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