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Practical aspects of well test analysis under composite reservoir situations. A.K. Ambastha. J. Can. Petrol. Technol., May 1995, 34(5), 41--46.

Well test analysis using a radial two-region composite reservoir model is discussed. The objective is to obtain estimated values of discontinuity radius, reservoir properties, and skin factors corresponding to both inner and outer regions. An ideal model response is discussed in mathematical terms. Problems caused by data misinterpretation are described. It is shown that this often leads to an erroneous interpretation of reservoir characteristics when using a radial, two-region composite reservoir model. Dimensionless pressure and pressure derivative responses for selected composite reservoirs are described and illustrated. An example well test interpretation is discussed. 28 refs.
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