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Numerical Simulation Research on Hydraulic Fracturing Promoting Coalbed Methane Extraction

机译：促进煤层萃取液压压裂的数值模拟研究

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Although hydraulic fracturing technology has been comprehensively investigated, few scholars have studied the influence of hydraulic fracturing on the effect of coalbed methane (CBM) extraction, and few considered the interaction between water and CBM in the research process, which is not conducive to guiding the engineering design of hydraulic fracturing wells. In this work, a hydraulic-mechanical-thermal coupled model for CBM extraction in hydraulic fracturing well is established; it combines gas-liquid two-phase infiltration, where nonisothermal adsorption is also considered. The COMSOL Multiphysics software is used to carry out the numerical simulation study of the CBM extraction process in hydraulic fracturing well and analyze the influence of coalbed permeability, initial methane pressure, and fracture length on CBM extraction in hydraulic fracturing well, and the results show that the hydraulic-mechanical-thermal coupled model for CBM extraction can be used for CBM extraction research in hydraulic fracturing well. The initial coalbed permeability, initial gas pressure, and fracture length all affect the migration speed of CBM to surface well in different ways and have a greater impact on the CBM production rate of hydraulic fracturing well. The greater the initial coalbed permeability and methane pressure are, the longer the fracture length is and the greater the CMB production rate of hydraulic fracturing well is. The change trend of coalbed permeability during the extraction process of surface fracturing well is directly related to the state of the reservoir. The factors of stress, temperature, and CBM desorption jointly determine the increase or decrease of coal seam permeability.
机译：虽然液压压裂技术已被全面调查，但很少有学者研究了液压压裂对煤层气萃取（CBM）提取作用影响的影响，并且很少考虑水和CBM之间的相互作用，这在研究过程中不利于引导液压压裂井的工程设计。在这项工作中，建立了液压压裂井中CBM提取的液压 - 机械热耦合模型;它结合了气液两相渗透，其中也考虑了非吸水吸附。 COMSOL Multiphysics软件用于进行液压压裂井中CBM提取过程的数值模拟研究，并分析煤层气渗透率，初始甲烷压力和断裂长度对液压压裂井中CBM提取的影响，结果表明CBM提取的液压 - 机械热耦合模型可用于液压压裂井中的CBM提取研究。初始煤层气渗透性，初始气体压力和断裂长度都以不同的方式影响CBM的迁移速度，并对液压压裂井的CBM生产率产生更大的影响。初始煤层渗透性和甲烷压力越大，骨折长度越长，液压压裂井的CMB生产率越大。表面压裂井提取过程中煤层气的变化趋势与水库的状态直接相关。压力，温度和CBM解吸的因素联合确定煤层渗透性的增加或降低。

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