Low-salinity water-alternating-CO2 EOR
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- 作者：Tadesse Weldu Teklua ; tteklu@mines.edu" class="auth_mail" title="E-mail the corresponding author ; Waleed Alameria ; b ; Ramona M. Gravesa ; Hossein Kazemia ; Ali M. AlSumaitib
- 关键词：Low-Salinity water EOR ; CO2 EOR ; LS-WAG ; LS-WACO2 ; Wettability alteration ; Interfacial tension (IFT)
- 刊名：Journal of Petroleum Science and Engineering
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：142
- 期：Complete
- 页码：101-118
- 全文大小：3988 K
文摘
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By combining low-salinity waterflood EOR and gas injection EOR, a new EOR process is proposed. The proposed EOR process is low-salinity water-alternate-gas/CO2 (LS-WACO2 or LS-WAG) injection.
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Coreflood in carbonate reservoir core and sandstone core were performed.
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Contact angle, Interfacial Tension (IFT), and minimum miscibility pressure (MMP) measurements were performed on carbonate, sandstone, and shale reservoirs.
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Thermodynamic modeling indicated that CO2-brine IFT decreases with decreasing brine salinity.
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Improved wettability alteration towards hydrophilic and IFT reduction are among the possible mechanisms by which LS-WACO2 or LS-WAG EOR mobilizes additional residual oil.