煤矿安全2024，Vol.55Issue(8)：51-61,11.DOI:10.13347/j.cnki.mkaq.20240300
煤层裂隙粗糙度与瓦斯开采效率耦合数值模型
A coupled numerical model of coal seam fracture roughness and gas extraction efficiency
摘要
Abstract
In the process of CO2-enhanced coalbed methane recovery,the behaviours of coal seam fractures significantly affect se-questration and extraction.To address the unclear impact of fracture roughness evolution on engineering efficiency under multi-phys-ical field coupling effects,we developed an innovative interdisciplinary mathematical model.This model introduces a parameter to quantitatively describe coal seam fracture roughness and couples it with the gas flow control equations under multi-field effects in the coal seam.We investigated the thermo-hydro-mechanical(THM)coupling effects and fracture network characteristics in the coal seam gas extraction process.Results show that the mathematical model aligns well with field data and effectively characterizes coal seam fracture roughness.Fracture roughness significantly influences the residual gas pressure in the coal seam and the injection pres-sure of CO2.When the roughness parameter decreases from 0.24 to 0.18,the maximum methane content decreases by 32.5%and the maximum CO2 pressure increases by 26.7%,the maximum gas adsorption capacity of coal seam decreased by 31.7%,and the max-imum CO2 adsorption capacity increased by 12.1%.关键词
瓦斯开采/非线性渗流/粗糙裂隙/CO2 封存/多场耦合/数值仿真Key words
gas extraction/nonlinear seepage/rough fractures/CO2 sequestration/multi-field coupling/numerical simulation分类
矿业与冶金引用本文复制引用
韩文彬,张迪,郑义,刘东洋..煤层裂隙粗糙度与瓦斯开采效率耦合数值模型[J].煤矿安全,2024,55(8):51-61,11.基金项目
煤炭科学技术研究院有限公司科技发展基金资助项目(2023CX-Ⅱ-15) （2023CX-Ⅱ-15）
