期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 78, 期 -, 页码 317-328出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2017.06.024
关键词
Nanopore confinement; Phase behavior; Capillary pressure; Wolfcamp shale reservoir; Mercury injection
资金
- Department of Energy [DE-FE0024311]
As unconventional oil production is the main focus in petroleum industry, the phase behavior of fluids in nanopore media draws high attention nowadays. The extremely small pore sizes in shale reservoirs affect the fluid phase equilibrium. In this study, the phase equilibrium of Wolfcamp oil in nanopores is studied by coupling the cubic Peng-Robinson equation of state (PR-EOS) with the Young-Laplace capillary pressure equation, fugacity of vapor-liquid calculation, and shifted critical properties. A mercury injection experiment showed that 93.7% of pore diameters in Wolfcamp cores were less than 10 nm. The capillary pressure curve in a real shale reservoir with a multicomponent Wolfcamp oil was generated for the first time. The results show that the bubble point pressure was suppressed by 17.3% when the pore radius (r) is 10 nm, and by 63.8% when r is 1.5 nm. The interfacial tension (IFT) decreases slowly when r is bigger than 50 nm. However, as r becomes smaller, the IFT decreases rapidly, especially when r is less than 10 nm. The nanopore confinement narrows the two-phase region, resulting in a lower capillary pressure and elongating the lower gas-oil ratio production period. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据