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Coupling mechanism of THM fields and SLG phases during the gas extraction process and its application in numerical analysis of gas occurrence regularity and effective extraction radius

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Petroleum Science 2022年第3期19卷 990-1006页

作者： Hui-Huang Fang Chun-Shan Zheng Ning Qi Hong-Jie Xu Hui-Hu Liu Yan-Hui Huang Qiang Wei Xiao-Wei Hou Lei Li Shuai-Liang Song State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainanAnhui 232001China Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui 230000China School of Earth and Environment Anhui University of Science and TechnologyHuainanAnhui 232001China Great Institute of Standardization China National Institute of Standardization's High Quality and Green Development Innovation R&D BaseJinanShandong 250101China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China School of Resources and Civil engineering Suzhou UniversitySuzhouJiangsu 234000China School of Resources and Environmental engineering Hefei University of TechnologyHefeiAnhui 230009China The Third exploration Team of shandong Coalfield geologic Bureau TaianShandong 250102China shandong provincial lunan geo-engineering exploration instituts JiningShandong 272100China

The analysis of the coupling mechanism of thermal-hydraulic-mechanical(THM)fields,and solid-liquidgas(SLG)phases during gas extraction process is of profound significance to explore its numerical application in the gas occurrence regularity and its effective extraction *** this study,the Hudi coal mine in Qinshui basin is taken as the research area,the influencing factors of gas occurrence were analyzed,the differences in overburden load for gas pressure distribution and the factors influencing the effective extraction radius were further discussed by using the COMSOL *** results show that the derivation of mathematical model in gas extraction shows that the process is a process the THM fields restrict each other,and the SLG phases influence each *** longer the extraction time,the larger the influencing range of borehole,and the better the extraction *** larger the diameter of borehole,the larger the effective extraction radius,and the influence on gas extraction effect is smaller in the early stage and larger in the late *** borehole arrangement should be flexibly arranged according to the actual extraction *** higher the porosity,the higher the permeability,the better the gas extraction *** larger the overburden load of reservoir,the stronger the effective stress,which will result in the more severe the strain,and the closure of pore and fracture,which in turn will lead to the decrease of permeability and slow down the gas *** relationship among extraction time,borehole diameter,negative pressure of gas extraction,permeability with effective extraction radius is *** study has important theoretical and practical significance for clarifying and summarizing the gas occurrence regularity and its engineering practice.

关键词： Gas occurrence regularity Effective extraction radius THM fields and SLG phases Numerical simulation COMSOL Multiphysics Hudi coal mine

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3D reconstruction of coal pore network and its application in CO_(2)-ECBM process simulation at laboratory scale

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Frontiers of Earth Science 2022年第2期16卷 523-539页

作者： Huihuang FANG Hongjie XU Shuxun SANG Shiqi Liu Shuailiang SONG Huihu LIU State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei 230000China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China Low Carbon Energy Institute China University of Mining and TechnologyXuzhou 221008China shandong provincial lunan geo-engineering exploration Institute Jining 272100China

Three-dimensional(3D)reconstruction of the equivalent pore network model(PNM)using X-ray computed tomography(CT)data are of significance for studying the CO_(2)-enhanced coalbed methane recovery(CO_(2)-ECBM).The docking among X-ray CT technology,MATLAB,with COMSOL software not only can realize the 3D reconstruction of PNM,but also the CO_(2)-ECBM process *** results show that the Median filtering algorithm enabled the de-noising of the original 2D CT slices,the image segmentation of all slices was realized based on the selected threshold,and the PNM can be constructed based on the Maximum Sphere *** mathematical model of CO_(2)-ECBM process fully coupled the expanded Langmuir *** the same time for CO_(2)injection,CH_(4)pressure tends to decrease with the increase of CO_(2)pressure,but its difference is not *** CH_(4)pressure in the slice center changed a lot,while at the edge it changed a little under different CO_(2)*** injected CO_(2)was transported to matrix along the macro and micro-fractures with continuous *** injected CO_(2)first replaced the adsorbed CH_(4)by covering the inner surface of macro-pores and meso-pores to form the single molecular layer adsorption of CO_(2).Then they migrated to micro-pores by Fick’s diffusion,sliding flow,and surface ***,the CO_(2)replaced CH_(4)adsorbed by volumetric filling in micro-pores,and formed the multi-molecular layer adsorption of CO_(2).The gas pressure and migration path between CO_(2)and CH_(4)are *** study can provide a theoretical basis for studying digital rock physics technology and enrich the development of CO_(2)-ECBM technology.

关键词： CO_(2)-ECBM 3D reconstruction numerical simulation X-ray CT COMSOL Qinshui Basin

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