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- Title
考虑应力敏感效应和含水影响的页岩基质 表观渗透率模型.
- Authors
李晓平; 刘蜀东; 李纪; 谭晓华
- Abstract
Based on Langmuir slip condition,properties of rock and gas,storage mechanisms of fluid,an appar ent permeability for gas transport in shale matrix is established. Coupling influence of ad/desorption effect, stress sensitivity effect,water saturation,real gas effect and volume content of organic pores is considered in proposed model,which is used to investigate dynamic change characteristics of gas transport capacity of shale matrix in reservoir condition. Then,the reliability of the proposed model is verified by experimental and LBM simulation data from literatures. During reservoir depletion,the apparent gas permeability of shale matrix initially decreases and then increases. What’more,gas slippage effect,radius,stress sensitivity effect and water saturation have significant impact on apparent gas permeability. The apparent gas permeability of shale matrix de⁃ creases with increase of stress sensitivity coefficient and irreducible water saturation. The apparent gas permeability of shale matrix impacted by irreducible water saturation and stress effective effect decreases by 87.56% when water saturation reaches 0.3.The proposed model provides a certain help for evaluating apparent gas permeability of shale matrix in reservoir conditions.
- Subjects
OIL shales; SHALE gas reservoirs; ROCKSLIDES; SHALE; PERMEABILITY; DESORPTION; THERMAL desorption
- Publication
Natural Gas Geoscience, 2021, Vol 32, Issue 6, p861
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.01.011