Analysis of Pressure Data From Vertically Fractured Injection Wells

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Abstract
This study investigates the flowing and shut-in pressure behavior of a fractured well located in a square drainage region with the outer boundary at a constant pressure. The fracture plane lies on one of the diagonals of the square. The report shows how to analyze pressure data for a five-spot pattern when the fracture orientation is most favorable (from the viewpoint of sweep efficiency). Comparisons are made with studies in the literature that assume an unfavorable fracture orientation. Fracture orientation must be considered in the analysis of pressure data for the following conditions: (1) small fracture-penetration ratios, (2) large flowing times prior to shut-in, and (3) large values of fracture flow capacity. Insights into the application of type-curve analysis to estimate drainage volumes are presented. Claims in the literature regarding the determination of the drainage volume by type-curve matching appear to be unrealistic.