页岩气在粗糙纳米孔中吸附和输运的分子模拟
Molecular simulation of shale gas adsorption and transport in rough nanopores
陈佳乐 1马妮萍 1国建华 1赵军华 2魏宁2
作者信息
- 1. 江南大学 江苏省食品先进制造装备与技术重点实验室,无锡 214122;江南大学 机械工程学院,无锡 214122
- 2. 江南大学 江苏省食品先进制造装备与技术重点实验室,无锡 214122;江南大学 先进技术研究院,无锡 214122;江南大学 机械工程学院,无锡 214122
- 折叠
摘要
从微观上理解固气表面的吸附和注气驱替原理,有助于完善页岩气开采理论.本文通过运用蒙特卡洛和分子动力学方法,模拟了甲烷在粗糙壁面结构孔隙中的吸附和流动行为.研究结果显示粗糙结构对甲烷的吸附量有显著影响,压力小于20 MPa时,粗糙模型中的吸附量更大.注气驱替时,粗糙模型中二氧化碳的突破时间和甲烷的采收率,相比光滑壁面模型明显增加.这是由于粗糙结构模型的页岩壁面表面积更大,在低压下气体吸附能力更强.矩形粗糙结构页岩模型的选择吸附性强于三角粗糙结构模型和光滑模型.研究阐明了甲烷吸附和驱替的微观机理,为提高页岩气采收率提供了指导.
Abstract
Understanding the mechanism of solid-gas interface adsorption and gas injection displacement at the microscopic scale contributes to perfect the theory of shale gas extraction.GCGM(Grant Canonical Monte Carlo)and MD(Molecular Dynamics)methods were consulted to simulate the methane adsorption and diffusion in the pores of rough wall structures.The investigation indicated that the rough structures significantly influence meth-ane adsorption,which is greater in the rough models when the pressure is less than 20 MPa.The breakthrough time of carbon dioxide and methane recovery in the rough models are increased compared to the slit model during gas injection displacement.Due to the larger surface area of the rough shale models,the gas adsorption capacity is stronger at low pressure.The rectangular structures shale model has stronger selective adsorption than the tri-angular and silt models.The research clarifies the microscopic mechanism of methane absorption and displace-ment and provides guidance for improving shale gas recovery.
关键词
页岩气/分子动力学模拟/粗糙纳米孔/吸附/输运Key words
Shale gas/Molecular simulation/Rough nanopore/Adsorption/Transport引用本文复制引用
基金项目
江苏省先进食品制造装备与技术重点实验室(FMZ202001)
江苏省先进食品制造装备与技术重点实验室(FMZ202009)
教育部智能纳米材料与器件重点实验室开放基金(INMD-2019M08)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据