Numerical Simulation Research on Hydraulic Fracturing Promoting Coalbed Methane Extraction

Although hydraulic fracturing technology has been comprehensively investigated, few scholars have studied the influence of on effect coalbed methane (CBM) extraction, and considered interaction between water CBM in research process, which is not conducive to guiding engineering design wells. In this work, a hydraulic-mechanical-thermal coupled model for extraction well established; it combines gas-liquid two-phase infiltration, where nonisothermal adsorption also considered. The COMSOL Multiphysics software used carry out numerical simulation study process analyze permeability, initial pressure, fracture length well, results show that can be well. gas all affect migration speed surface different ways greater impact production rate permeability pressure are, longer CMB is. change trend during directly related state reservoir. factors stress, temperature, desorption jointly determine increase or decrease coal seam permeability.