Modeling Wettability Variation during Long-Term Water Flooding

Surface property of rock affects oil recovery during water flooding. Oil-wet polar substances adsorbed on the surface of the rock will gradually be desorbed during water flooding, and original reservoir wettability will change towards water-wet, and the change will reduce the residual oil saturation...

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Published in:Journal of chemistry 2015-01, Vol.2015 (2015), p.1-11
Main Authors: Cao, Renyi, Ma, Y. Zee, Sun, Changwei
Format: Article
Language:English
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Hydraulic measurements
Observations
Wetting
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description Surface property of rock affects oil recovery during water flooding. Oil-wet polar substances adsorbed on the surface of the rock will gradually be desorbed during water flooding, and original reservoir wettability will change towards water-wet, and the change will reduce the residual oil saturation and improve the oil displacement efficiency. However there is a lack of an accurate description of wettability alternation model during long-term water flooding and it will lead to difficulties in history match and unreliable forecasts using reservoir simulators. This paper summarizes the mechanism of wettability variation and characterizes the adsorption of polar substance during long-term water flooding from injecting water or aquifer and relates the residual oil saturation and relative permeability to the polar substance adsorbed on clay and pore volumes of flooding water. A mathematical model is presented to simulate the long-term water flooding and the model is validated with experimental results. The simulation results of long-term water flooding are also discussed.
doi_str_mv 10.1155/2015/592951
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subjects Hydraulic measurements
Observations
Wetting
title Modeling Wettability Variation during Long-Term Water Flooding
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