Transport Behavior of Methane Confined in Nanoscale Porous Media: Impact of Pore Evolution Characteristics

As a key technical aspect contributing to shale gas development, nanoconfined methane flow behavior has received tremendous research interest, which remains challenging understand clearly. The majority of previous contributions put emphasis on the mechanism model for confined in single nanopore; at same time, other part focusing an upscaling approach fails capture spatial pore-network characteristics as well way assign pressure conditions behavior. In light current knowledge gap, modeling is performed, pore coordination number, indicating maximum pores specified can connect, regimes classified by Knudsen numbers, different assigned conditions, are incorporated. Notably, completely self-coded, more flexible adjusting features constructed network than traditional one. this paper, elaborated first, then method based mass conservation principle introduced upscaling, and in-depth analysis implemented after that. Results show that (a) porous media with sizes ranging from 5~80 nm, dramatic advancement apparent permeability takes place while less 1 MPa; (b) evaluated shall be underestimated much 31.1% average compared under pressure-difference condition; (c) both large size high number beneficial strong capacity through nanoscale media, rising ratio reach about 6 times altering 3 7, quantified presented first time.