工程科学学报2018，Vol.40Issue(2)：136-143,8.DOI:10.13374/j.issn2095-9389.2018.02.002
基于微观机理的页岩气运移分析
Micro-mechanism analysis of shale gas migration
摘要
Abstract
For shale gas exploitation, it is scientifically essential to clarify the mechanism of gas flow in nanopore media. Shale is a kind of tight rock, whose pore size mainly ranges from several nanometers to dozens of nanometers. Since it is of the same magnitude as the gas molecular mean free path, the collision between the gas molecular and pore surface is not negligible for gas flow and results in the failure of Darcy' s law when describing this low permeability reservoir gas flow mechanism. In order to clarify the micropore gas flow mechanism and the real extraction process of shale gas, a multiphysics governing equation was established, which combines slip flow, Knudsen diffusion, Langmuir isotherm adsorption, and pore compressibility. The effect of different flow regimes on slip flow was analyzed, and the threshold pore size was obtained with consideration of the slippage effect. Then, the contribution of desorption to gas production rate and gas output was clarified based on the organic content of disparate shale samples. The results indicate that the gas production rate is sensitive to pore compressibility, and it is more reasonable to simulate the gas flow process when considering pore compressibility.关键词
滑移流动/孔隙压缩/Knudsen扩散/Langmuir等温吸附/页岩气Key words
slip flow/pore compressibility/Knudsen diffusion/Langmuir isotherm adsorption/shale gas分类
建筑与水利引用本文复制引用
张鹏伟,胡黎明,温庆博..基于微观机理的页岩气运移分析[J].工程科学学报,2018,40(2):136-143,8.基金项目
清华大学自主科研计划资助项目(THZ20161080101) （THZ20161080101）
国家自然科学基金资助项目(41372352) （41372352）
