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致密多孔介质中气体非达西现象的LBM模拟

Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2010-06-15

Journal: 辽宁工程技术大学学报(自然科学版)

Included Journals: ISTIC、PKU

Volume: 29

Issue: 3

Page Number: 412-415

ISSN: 1008-0562

Key Words: 格子Boltzmann方法;气体渗流;Klinkenberg效应;非达西现象

Abstract: 针对气体在致密多孔介质中低速渗流时,其渗流规律在渗流曲线的低压段表现出对达西定律线性关系的偏离,存在着非达西现象.采用格子Boltzmann方法,研究气体和多孔介质的特性对气体渗流Klinkenberg效应的影响因素.结果表明:在气体渗流曲线的低压力梯度段,随着气体黏度系数、净围压、渗透率和孔隙率的变小,渗流曲线的非线性临界点向压力梯度增大的方向移动,对达西定律线性关系的偏离更明显.说明在低渗和低压情况下Klinkenberg效应不能被忽略,气体黏度系数和孔隙率对Klinkenberg效应作用有影响;当净围压或渗透率很大时,气体渗流流量和压力梯度符合达西定律线性关系.

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