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- Title
等温条件下页岩储层视渗透率随压力变化规律研究.
- Authors
崔亚星; 熊伟; 胡志明; 左罗; 高树生
- Abstract
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.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p514
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.01.011