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| Effective Wellbore Radius and Typical Curve Characteristics of Well Test Analysis: Non-Newtonian Power-law Fluids |
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Abstract: Among numerous tertiary recovery technologies, Alkaline-Surfactant-Polymer(ASP) flooding is one of the most important Enhanced Oil Recovery (EOR) methods. In this method, the ASP solution system exhibits the characteristics of non-Newtonian power-law fluid. A well test model with consideration of storage and skin effects is established in this paper based on non-Newtonian power-law fluid in infinite, constant pressure and no-flow circular boundary homogeneous reservoirs. The effective wellbore radius was obtained by
introducing the dimensionless definitions of the effective wellbore radius and integrating parameters. Theoretical curves were obtained and further analyzed. In addition, the expressions of the early-time storage stage and the late-time radial flow phase were simplified, with two analytic solutions being derived by Laplace transformation. The results show that the early-time response stage is influenced by the combined parameter of storage and skin and the radial flow stage is affected by the power-law index for the homogeneous well test curve. The proposed model can provide a theoretical foundation for well test data analysis of ASP flooding.
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Received: 05 November 2009
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Corresponding Authors:
Guang-Yao LIANG
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2010, Vol. 28 
