Summary
This study presents a three-dimensional analytical model to analyze the transient flow into perforated vertical wells. The model considers arbitrary phasing angle, nonuniform perforation size and length, and formation damage around perforations. The characteristics of transient pressure and derivative responses of perforated wells are investigated. A sensitivity study is carried out to identify the impact of various reservoir and completion parameters on the transient pressure and derivative responses. It is observed that convergent flow into perforations significantly influences the early-time and intermediate-time pressure responses. A pseudoskin expression, which can be used to estimate the inflow performance, is also presented.
Copyright 1999, Society of Petroleum Engineers
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