我国煤层瓦斯运移模型研究进展

Research progress of coalbed gas migration model in China

煤层瓦斯运移是矿井瓦斯抽采与煤矿区煤层气开发领域的基础科学问题。从理论分析、试验方法 2个方面,阐述了我国煤层瓦斯运移理论及其渗透特性测试方法的研究现状,重点围绕煤层瓦斯非线性渗流特性、多场耦合作用下的渗流理论等关键问题的最新成果开展论述;进一步对当前普遍采用的煤层瓦斯运移特性的试验方法进行分析。研究建议:深入研究钻孔周围煤体真实应力-应变状态、瓦斯渗透过程中煤孔隙率的演化特性测试等问题,深化对煤层瓦斯非线性渗流模型、与增透或增产措施相适应的瓦斯运移特征演化等问题的认识。

Coal bed gas migration is a basic scientific problem in the field of mine gas drainage and coal bed gas development in coal mine areas.This paper expounds the research status of the theory of coal seam gas migration and the testing method of its permeability characteristics in China from two aspects of theoretical analysis and test methods,and focuses on the latest achievements and understanding of the key issues such as the nonlinear seepage characteristics of coal seam gas and the seepage theory under multi-field coupling.Further analysis is made on the test methods of coal seam gas transport characteristics commonly used at present,and research suggestions are as follows:in-depth research on the reproduction of the real stress-strain state of coal body around the borehole,the evolution characteristics of coal porosity in the gas permeation process,and deepening the understanding of the nonlinear seepage model of coal seam gas,and the evolution of gas transport characteristics in accordance with the permeability improvement or stimulation measures.Based on the adaptive multi-field and multi-factor coupling model established.