收稿日期: 2016-03-25
修回日期: 2017-01-20
网络出版日期: 2017-04-10
基金资助
国家科技重大专项“页岩气开发机理及技术政策研究”(编号：2011ZX05018-005)；国家重点基础研究发展计划(“973”)“中国南方海相页岩气高效开发的基础研究”(编号：2013CB228000)联合资助.
Study on change regularity of apparent permeability of shale layer varying with pressure in isothermal condition
Received date: 2016-03-25
Revised date: 2017-01-20
Online published: 2017-04-10
崔亚星，熊伟，胡志明，左罗，高树生 . 等温条件下页岩储层视渗透率随压力变化规律研究[J]. 天然气地球科学, 2017 , 28(4) : 514 -520 . DOI: 10.11764/j.issn.1672-1926.2017.01.011
In reservoirs,shale gas flows within a wide range of differential pressure and pressure gradient.The flow process is influenced by several mechanisms such as Knudsen diffusion and slippage effect.Flow characteristics vary with flow mechanisms.By experiments of nitrogen and helium flow in 9 shale samples,the variation of apparent permeability within a certain pressure range at isothermal condition could be obtained.The results show that apparent permeability of shale where Knudsen diffusion occurs is tens of times higher than conventional gas logging permeability.The actual flow ability of reservoirs increases because of Knudsen diffusion under the condition of small pressure difference or pressure gradient.When the pressure level or pressure gradient is relatively low,diffusion is an important mechanism for mass transfer.The conclusions are significant to further research on basic flow rules of shale gas and guidance to improve shale gas production.
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