Influence of gas migration on permeability of soft coalbed methane reservoirs under true triaxial stress conditions.

ABSTRACT: The permeability of the coal body is the key parameter restricting the efficient extraction of coalbed methane, and scholars have analysed it from two angles of the change of stress state and porosity of the coal body. However, there is still a lack of study on the mechanism of gas migration and movement in soft coalbed methane reservoir under the coupling between the true triaxial stress field (maximum principal stress σ 1 > intermediate principal stress σ 2 > minimum principal stress σ 3) and the gas pressure field. In this paper, the coal gas adsorption and seepage experiments are conducted through the self-developed true triaxial 'gas-solid' coupled coal mass seepage system with gas as the adsorption and seepage medium and coal briquette taking the place of soft coalbed methane reservo

SUBMITTER: Wang G 

PROVIDER: S-EPMC6837214 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature