Abstract

Abstract The Acoustic Well Sounding (AWS) method can be used for indirectly computing both bottomhole pressure (BHP) and rate of afterflow in pumping wells. This calculation uses fluid level and casinghead pressure data obtained during a a transient test. During pressure buildup tests, free gas goes back into solution as the pressure increases in the wellbore. This causes a reduction in both oil density and free gas flow rate. Mass transfer between the oil and gas phases has not been explicitly considered in the literature. This can be of significant influence for long shutin time. In this paper a method is proposed which accounts for the mass transfer between liquid and gas phases. A selected comparison example from the literature has been interpretated using both conventional and rate deconvolution analysis.

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