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Influencing Factors of Nonlinear Flow Well Test Model in ASP Compounded Flooding Reservoir |
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Abstract: The oil industry shows a great deal of interest in Alkali-Surfactant-Polymer(ASP) flooding in recovery operations. For its application, it is necessary to study the mechanisms of non-Newtonian flow through porous media. The present investigation shows that ASP solutions exhibit power-law and elastic properties within certain shear rates. The effect of viscoelasticity on the well test curve is studied from macroscopic perspective. Based on a varying cross-section throat model, the established viscous-elastic constitutive equation, with the consideration of the viscoelasticity and the variation of rheological parameters of ASP solutions, the seepage well test model of alkaline-surfactant-polymer solutions is established and solved by finite difference method, to obtain dimensional and dimensionless well test curves. From the dimensional typical curve, the effect of the parameters on the dimensional well test curve can be seen, such as the power-law exponent, injective rate, consistency coefficient, permeability, relaxation time, and tortuosity factor. The influence of these parameters can also be seen on the configuration of the well test curve in ASP reservoir. It is shown that it is necessary to consider the variation of rheological parameters and viscous-elasticity to some extent, in the application of the well test analysis method for ASP flooding reservoir. However, the power-law well test model is appropriate for ASP reservoir under the condition that rheological parameters change gently and with relatively small viscoelasticity. The research results of the well test model provide some food of thought for further investigation into ASP seepages.
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Received: 24 November 2009
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Corresponding Authors:
Guang-Yao LIANG
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