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Received July 17, 2019
Accepted September 3, 2019
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A Novel Approach for Well-Test Analysis of Volatile Oil Reservoirs in Two-Phase Flow Conditions
Department of Petroleum Engineering, Amirkabir University of Technology, No. 424, Hafez Ave., Tehran, Iran 1Department of Chemical Engineering, Amirkabir University of Technology, No. 424, Hafez Ave., Tehran, Iran
rashidi@aut.ac.ir
Korean Chemical Engineering Research, December 2019, 57(6), 883-890(8), 10.9713/kcer.2019.57.6.883 Epub 3 December 2019
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Abstract
Two-phase flow near the wellbore in volatile oil reservoirs causes complications in well test analysis. In this study, the flow behavior of volatile oil reservoirs below the bubble-point pressure and the potential of radial composite model for interpretation of two-phase well test in volatile oil reservoirs was investigated. A radial composite model was used for two-phase well test analysis. A new procedure was developed to interpret well test data and estimate the radius of the two-phase region. The changes in fluid composition near the wellbore during drawdown test were found to increase the saturation pressure, which affects the saturation profile during build-up. Well test results showed that the radial composite method is a powerful tool for well test characterization and estimation of reservoir parameters. The proposed procedure was able to estimate the reservoir parameters and radius of the two-phase region with acceptable accuracy.
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