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Computer analysis of thermal recovery well test data


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The radius of the swept zone is an important parameter in secondary recovery by thermal methods. There have been several methods proposed to determine this parameter from well tests performed on the injection well. Perhaps the most powerful method presently is the pseudo-steady state analysis method where a straight line is found on a plot of well data on Cartesian axes. This method is only valid for the case where there is a high mobility ratio between the swept and unswept zones. Though it has been extended to the case of a low mobility ratio, analysis then becomes virtually impossible. Automated type-curve match offers a new way to analyze well test data. Laplace space determination of parameter gradients allows type-curve match to the most complex of mathematical models. This study shows that automated type-curve match to the two-zone reservoir model can be used to analyze well tests on thermal recovery injection wells. A comparison with the best of present methods, i.e., the pseudo-steady state method, shows that automated type-curve match proves to be better in the determination of swept zone radius when mobility ratio is not high or when multiple flow rates have occurred. In addition automated type-curve match can, in some cases, estimate unswept zone parameters like mobility and porosity-compressibility product. The application of automated type-curve match to two field examples is demonstrated. 11 references, 50 figures, 4 tables.

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Last Updated September 29, 2016, 16:03 (EST)
Created September 29, 2016, 16:03 (EST)
Citation Barua, J. Horne, R.N. ---- Roy Long, Computer analysis of thermal recovery well test data, 2016-09-29,
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Point Of Contact Roy Long
Program Or Project KMD
Publication Date 1985-1-1