Estimation Of Skin In The Interpretation Of Injection Tests In Fractured Reservoirs (original) (raw)

2013

Abstract

Injection/fall-off testing is one of the unconventional well test methodologies used to eliminate hydrocarbon flaring and thus gas emissions into the atmosphere. Except for fluid sampling, all of the main well testing targets can be achieved, while complying with the environmental regulations. However, the interpretation of injection tests in oil reservoirs is complicated by the presence of two immiscible mobile phases in the reservoir: the hydrocarbon originally in place and the injected fluid. As a result, the total fluid mobility is reduced and an additional pressure increment occurs, which affects the total skin with an additional bi-phase skin component. Furthermore, natural or induced fractures can be intercepted by the well, reducing the total skin but adding complexity to the test interpretation. Typically, the application of traditional analytical models to interpret injection tests only provides the total well skin while its mechanical component, due to permeability damage...

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