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- W4297680968 abstract "The theory about conventional water-flooding relations is based on the linear relationship between ln(Kro/Krw) and Sw at low water cut stage. However, the fact is that the relationship is no longer linear and the curve bends downward after the reservoir enters into high water-cut stage; and at the same time the water-flooding characteristic curve warps upward. Such phenomenon cannot be explained by conventional water-flooding relation theories. In this study, flowing the reservoir development rule, a new relation between ln(Kro/Krw) and Sw for high water-cut reservoirs was built based on the Buckley-Leverett advancing front equation and the Welge average water saturation equation. This new relation can accurately fit the bend of the ln(Kro/Krw) - Sw curve for high water-cut reservoirs. And based on it, the water-flooding characteristic curve for high water-cut reservoirs was obtained, which has been proved to be able to accurately describe the upwarp section of the water-flooding curve and accurately predict the development dynamics of high water-cut reservoirs. Studies show that the following root cause is why the semi-logarithmic straight section of ln(Kro/Krw) vs. Sw for high water-cut reservoirs bends. Long-time waterflooding may make the reservoir more hydrophilic, water easy to cover the pore wall, and oil move to the center of the pore and isolated by water from the pore wall. Oil becoming discontinuous means an abrupt decrease of flow capacity. This is consistent with the warp of the water-flooding curve at high water-cut stage." @default.
- W4297680968 created "2022-09-30" @default.
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- W4297680968 date "2022-01-01" @default.
- W4297680968 modified "2023-09-30" @default.
- W4297680968 title "A Study on Water-Flooding Characteristic Curves for High-Water-Cut Reservoirs" @default.
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- W4297680968 doi "https://doi.org/10.1007/978-981-19-2149-0_75" @default.
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