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Experimental and numerical study of coal mechanical properties during coalification jumps

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Frontiers of Earth Science 2023年第1期17卷 45-57页

作者： Qiang HUANG xuehai fu Jian SHEN Qiangling YAO Ming CHENG Key Laboratory of Coalbed Methane Resources&Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of EducationChina University of Mining&TechnologyXuzhou 221116China

The mechanical characteristics of coal reservoirs are important parameters in the hydraulic fracturing of *** this study,coal samples of different ranks were collected from 12 coal mines located in Xinjiang and Shanxi,*** coal ranks were identified with by the increased Maximum vitrine reflectance(Ro,max)*** triaxial compression experiments were performed to determine the confining pressure effect on the mechanical properties of coal samples of different *** numerical approaches,including the power function,arctangent,and exponential function models,were used to find the correlation between coal elastic modulus and the confining *** fitting equations of compressive strength and elastic modulus of coal ranks were constructed under different confining *** results showed that the coal compressive strength of different ranks has a positive linear correlation with the confining *** coal elastic modulus and confining pressure showed an exponential ***’s ratio of coal and confining pressure show negative logarithmic *** stress sensitivity of the coal elastic modulus decreases with the increase of confining *** coalification jump identifies that the compressive strength,elastic modulus,and stress sensitivity coefficient of coal have a polynomial relationship with the increase of coal *** inflection points in coalification at Ro,max=0.70%,1.30%,and 2.40%,are the first,second,and third coalification *** findings provide significant support to coal fracturing during CBM production.

关键词： compressive strength elastic modulus confining pressure Poisson’s ratio coalification jump

倾斜煤层煤层气与煤炭地下气化协调开发技术构想

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煤炭科学技术 2024年第5期52卷 152-165页

作者：韦波杨曙光李鑫王双明师庆民杨兰和王刚傅雪海苏红梅贾超胡振鹏赵琛新疆维吾尔自治区煤田地质局一五六煤田地质勘探队新疆乌鲁木齐830047 新疆大学地质与矿业工程学院新疆乌鲁木齐830047 新疆亚新煤层气投资开发(集团)有限责任公司新疆乌鲁木齐830009 新疆维吾尔自治区煤田地质局煤层气研究开发中心新疆乌鲁木齐830091 西安科技大学地质与环境学院陕西西安710054 中国矿业大学资源与地球科学学院江苏徐州221000 新疆维吾尔自治区能源安全监测中心新疆乌鲁木齐830002

煤层气(CBM)开发与煤炭地下气化(UCG)是我国煤基天然气生产的重要来源,新疆前陆冲断带倾斜煤层发育区煤与煤层气资源丰富。为深入剖析倾斜煤层CBM与UCG协调开发可行性,系统剖析了现有CBM与UCG关键技术及其对CBM−UCG协调开发的借鉴意义,... 详细信息

煤层气(CBM)开发与煤炭地下气化(UCG)是我国煤基天然气生产的重要来源,新疆前陆冲断带倾斜煤层发育区煤与煤层气资源丰富。为深入剖析倾斜煤层CBM与UCG协调开发可行性,系统剖析了现有CBM与UCG关键技术及其对CBM−UCG协调开发的借鉴意义,分析了倾斜煤层CBM与UCG协调开发优势、技术路径、面临的主要问题和未来研究方向,得到以下认识:①“CBM开发疏干效应”“UCG热作用解吸效应”“UCG采动卸压效应”下CBM−UCG协调开发可形成相互促进的良性循环;②提出了直井+顺煤层倾向井“先抽后烧”、顺煤层倾向井组合“边抽边烧”、定向L型CBM井+顺煤层倾向UCG井“边烧边抽”、下部煤层布置沿倾向UCG井+上部煤层布置定向L型CBM井“先抽后烧再抽”、复杂井型“井工厂式”布置等协调开发技术路径;③CBM与UCG协调开发面临地质选区评价理论基础研究薄弱、缝网条件下UCG热作用扩展范围不清、倾斜煤层UCG过程岩层移动卸压范围不明等理论问题;同时面临CBM−UCG协调开发“井工厂式”钻井技术、CBM井与UCG井协调开发生产制度、CBM与UCG协调开发地质动态测控、CBM井密封性与耐高温性保护等工程问题;④要强化倾斜煤层CBM与UCG协调开发地质选址评价研究、开发动态理论研究、工程协调技术先导性试验研究,确保协调开发安全、有序、可控、高效。

关键词：煤层气煤炭地下气化倾斜煤层协调开发技术路径

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

Pore size distribution of high volatile bituminous coal of the southern Junggar Basin: a full-scale characterization applying multiple methods

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Frontiers of Earth Science 2021年第2期15卷 237-255页

作者： Wanchun ZHAO Xin LI Tingting WANG xuehai fu Key Laboratory of Continental Shale Accumulation and Development(Ministry of Education) Northeast Petroleum UniversityDaqing 163000China School of Geology and Mining Engineering Xinjiang UniversityUrumqi 830047China School of Electrical Engineering and Information Northeast Petroleum UniversityDaqing 163000China School of Resources&Earth Science China University of Mining&TechnologyXuzhou 221008China

Studying on the pore size distribution of coal is vital for determining reasonable coalbed methane development *** coalbed methane project is in progress in the southern Junggar Basin of northwestern China,where high volatile bituminous coal is *** this study,with the purpose of accurately characterizing the full-scale pore size distribution of the high volatile bituminous coal of the southern Junggar Basin,two grouped coal samples were applied for mercury intrusion porosimetry,low-temperature nitrogen adsorption,low-field nuclear magnetic resonance,rate-controlled mercury penetration,scanning electron microscopy,and nano-CT measurements.A comprehensive pore size distribution was proposed by combining the corrected mercury intrusion porosimetry data and low-temperature nitrogen adsorption *** relationship between transverse relaxation time(T2,ms)and the pore diameter was determined by comparing the T2 spectrum with the comprehensive pore size *** macro-pore and throat size distributions derived from nano-CT and rate-controlled mercury penetration were distinguishingly *** results showed that:1)comprehensive pore size distribution analysis can be regarded as an accurate method to characterize the pore size distribution of high volatile bituminous coal;2)for the high volatile bituminous coal of the southern Junggar Basin,the meso-pore volume was the greatest,followed by the transition pore volume or macro-pore volume,and the micro-pore volume was the lowest;3)the relationship between T2 and the pore diameter varied for different samples,even for samples with close maturities;4)the throat size distribution derived from nano-CT was close to that derived from rate-controlled mercury penetration,while the macro-pore size distributions derived from those two methods were very *** work can deepen the knowledge of the pore size distribution characterization techniques of coal and provide new insight for accurate pore s

关键词： pore size distribution coalbed methane high volatile bituminous coal low field nuclear magnetic resonance the southern Junggar Basin

Effect of an electrostatic field on gas adsorption and diffusion in tectonic coal

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International Journal of Mining Science and Technology 2015年第4期25卷 607-613页

作者： Jian Kuo Lei Dongji fu xuehai Zhang Yugui Li Hengle School of Resources and Earth Science China University of Mining & Technology School of Safety Science and Engineering Henan Polytechnic University

The characteristics of adsorption, desorption, and diffusion of gas in tectonic coal are important for the prediction of coal and gas outbursts. Three types of coal samples, of which both metamorphic grade and degree of damage is different, were selected from Tongchun, Qilin, and Pingdingshan mines. Using a series of experiments in an electrostatic field, we analyzed the characteristics of gas adsorption and diffusion in tectonic coal. We found that gas adsorption in coal conforms to the Langmuir equation in an electrostatic field. Both the depth of the adsorption potential well and the coal molecular electronegativity increases under the action of an electrostatic field. A Joule heating effect was caused by changing the coal–gas system conductivity in an electrostatic field. The quantity of gas adsorbed and DP result from competition between the depth of the adsorption potential well, the coal molecular electronegativity, and the Joule heating effect. DP peaks when the three factors control behavior equally. Compared with anthracite, the impact of the electrostatic field on the gas diffusion capacity of middle and high rank coals is greater. Compared with the original coal, the gas adsorption quantity, DP, and the gas diffusion capacity of tectonic coal are greater in an electrostatic field. In addition, the smaller the particle size of tectonic coal, the larger the DP.

关键词：气体吸附瓦斯扩散构造煤静电场煤与瓦斯突出预测焦耳热效应扩散能力解吸特性

Research into comprehensive gas extraction technology of single coal seams with low permeability in the Jiaozuo coal mining area

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Mining Science and Technology 2011年第4期21卷 483-489页

作者： fu Jiangwei fu xuehai Hu Xiao Chen Li Ou Jianchun School of Resource and Earth Science China University of Mining Er Technology Xuzhou 221008 China Henan Provincial Coal Seam Gas Development and Utilization Co. LTD. Zhengzhou 450016 China Department of Industry and Business Administration Henan F.ngineering College Xinzheng 451191 China Faculty of Safety Engineering China University of Mining ＆ Technology Xuzhou 221008 China

For a low permeability single coal seam prone to gas outbursts,pre-drainage of gas is difficult and inefficient,seriously restricting the safety and efficiency of *** measures of increasing gas extraction efficiency are pressure relief and infrared *** have analyzed the effect of mining conditions and the regularity of mine pressure distribution in front of the working face of a major coal mine of the Jiaozuo Industrial(Group) *** our test area,studied the width of the depressurization zone in slice mining and analyzed gas efficiency and fast drainage in the advanced stress relaxation *** that basis,we further investigated and practiced the exploitation technology of shallow drilling,fan drilling and grid shape drilling at the working *** and our results show that the stress relaxation zone is the ideal region for quick and efflcient extraction of *** means of an integrated extraction technology,the amount of gas emitted into the zone was greatly reduced,while the risk of dangerous outbursts of coal and gas was lowered *** exploration provides a new way to control for gas in working faces of coal mines with low permeability and risk of gas outbursts of single coal seams in the Jiaozuo mining area.

关键词：煤层瓦斯焦作矿区提取技术低渗透煤矿工作面瓦斯突出煤层压力分布规律应力松弛

Multi-Layer Superposed Coalbed Methane System in Southern Qinshui Basin, Shanxi Province, China

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Journal of Earth Science 2015年第3期26卷 391-398页

作者： Zheng Zhang Yong Qin xuehai fu Zhaobiao Yang Chen Guo School of Resources and Goesciences China University of Mining and Technology Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process Ministry of EducationChina University of Mining and Technology

Multi-coalbed developed in Carboniferous–Permian coal-bearing strata of southern Qinshui Basin, and different coal-bearing segments have different coalbed methane（CBM） reservoiring characteristics. Analysis of previous studies suggests that the essence of an unattached CBM system is to possess a unified fluid pressure system, which includes four key elements, namely, gas-bearing coal-rock mass, formation fluid, independent hydrodynamic system and capping layer condition. Based on the exploration and exploitation data of CBM, it is discovered that the gas content of coal seams in southern Qinshui Basin presents a change rule of non-monotonic function with the seam dipping, and a turning point of the change appears nearby coal seam No. 9, and coal seams of the upper and the lower belong to different CBM systems respectively; well test reservoir pressure shows that the gradient of coal seam No. 15 of the Taiyuan Formation is significantly higher than that of coal seam No. 3 of the Shanxi Formation; the equivalent reservoir pressure gradient of coal seam No. 15 ＂jumps＂ obviously compared with the reservoir pressure gradient of coal seam No. 3 in the same vertical well, that is, the relation between reservoir pressure and burial depth takes on a characteristic of nonlinearity; meanwhile, the vertical hydraulic connection among the aquifers of Shanxi Formation and Taiyuan Formation is weak, constituting several relatively independent fluid pressure systems. The characteristics discussed above reveal that the main coal seams of southern Qinshui Basin respectively belong to relatively independent CBM systems, the formation of which are jointly controlled by sedimentary, hydrogeological and structural conditions.

关键词： multi-coalbed coalbed methane system fluid pressure system equivalent reservoir pressure gradient formation mechanism

Comprehensive analysis of CBM recovery in high rank coal reservoir of Jincheng area

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International Journal of Mining Science and Technology 2013年第3期23卷 447-452页

作者： Liu Aihua fu xuehai Luo Bin Luo Peipei Jiao Chunlin School of Resources and Geoscience China University of Mining & Technology Key Laboratory of CBM Resource and Reservoir-Generating Process Ministry of Education College of Geology and Exploration Engineering Xinjiang University Coal Geological Designing Institute of Jiangsu Province

Coalbed methane (CBM) predicting recovery in high rank coal reservoir varies greatly in Jincheng area and it seriously influences efficient and economic exploitation of CBM resource. In order to predict more accurate CBM recovery, we conducted history matching and productivity prediction of vertical well by using COMET 3 reservoir modeling software, innovatively adopted the gas desorption experiment of bulk coal at fixed test pressure, analyzed the recovery extent method of Daning multiple-hole horizontal well and Panzhuang well group, and calculated recovery by sorption isotherm method of 14 vertical CBM wells at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The results show that the reservoir simulation methods (numerical simulation method and the recovery extent method) is more reliable than the theoretical analysis of coal sample (sorption isotherm method and desorption experiment method). Also, desorption experiment method at fixed pressure is superior to sorption isotherm method. Through the comprehensive analysis and linear correction, CBM recovery ratios in high rank coal reservoir of Jincheng area were found to be 38.64%, 49.30%, 59.30%, and 69.20% at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The research results are of significant importance in the CBM exploration and development in Jincheng area.

关键词： CBM Recovery Desorption at fixed pressure Recovery extent

Self-adjusted elastic action and its CBM pool-forming effect of the high rank coal reservoir

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Chinese Science Bulletin 2005年第S1期50卷 99-103页

作者： QIN Yong fu xuehai WU Caifang fu Guoyou BU Yingying Institute of Mineral Resources and Geoscience China University of Mining&TechnologyXuzhou 221008China

The coal reservoir is a kind of geologic body with considerable elasticity, and its response to stress is more sensitive than the routine ones. In the pool-forming process of the coalbed methane, (CBM) the action of many external geodynamic factors in the coal reservoir is represented by the ability of CBM’s diffusion and migration in the coal reservoir. Therefore, the occurrence of the natural fissures in the coal reservoir becomes a key that determines whether the CBM pool can be formed or not. Based on the principle, the authors have designed a comprehensive method of physical modeling to study the elasticity of the coal matrix block with different coal ranks in the light of the solid to fluid coupling, have established the model of the volume deformation (self-adjusted elastic effect) of the coal reservoir under the condition of the effective stress-adsorption/desorption, and have obtained a correct understanding of the law of the elastic deformation. Afterwards, a new viewpoint, named as the self-closing elastic effect for forming the CBM pool in the high rank reservoir, is put forward, providing an initial point and a scientific basis for a further investigation into its dynamic factors, possible mechanism and role in the CBM energy-balancing system.

关键词： coalbed methane reservoir elasticity self-adjusted action pool-forming effect.