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• W2057488328 abstract "Abstract This study investigates the flowing and shut-inpressure behavior of a fractured well located in asquare drainage region with the outer boundary at aconstant pressure. The fracture plane lies on one ofthe diagonals of the square. The report shows how toanalyze pressure data for a five-spot pattern when thefracture orientation is most favorable (from theviewpoint of sweep efficiency). Comparisons aremade with studies in the literature that assume anunfavorable fracture orientation. Fractureorientation must be considered in the analysis ofpressure data for the following conditions:smallfracture-penetration ratios,large flowing timesprior to shut-in, andlarge values of fractureflow capacity. Insights into the application of type-curve analysisto estimate drainage volumes are presented. Claimsin the literature regarding the determination of thedrainage volume by type-curve matching appear tobe unrealistic. Introduction No quantitative data are available on the effect of thecompass orientation of a vertical fracture on pressuretransient data (injection or falloff). This is surprisingsince pressure falloff tests are the principal means ofdetermining the efficacy of a fluid-injectionprogram - e.g., the effective formation flowcapacity, injectivity, skin factor, average reservoirpressure, and position of the flood front. Perhaps the dearth of information on this topic isdue to the fracture lengths being small comparedwith interwell distances in most waterflood orgas-injection projects. If the fracture length is smallcompared with the interwell distance, the orientationof the fracture should have a negligible effect on theshape of the pressure vs. time curve. However, withnew enhanced recovery projects that require closerwell spacing, interwell distances are of the same orderof magnitude as the created fracture length. In such instances, compass orientation of a vertical fracturecan have a significant effect on pressure data. All studies of the transient pressure behavior offractured wells in a bounded drainage region haveassumed that the fracture plane is parallel to theboundaries, which were considered to be eitherclosed or at constant pressure. Raghavan andHadinoto showed that the constant pressureouter-boundary solutions can be applied to a fractured wellin a five-spot injection-production pattern. However, the assumption that the fracture plane is parallel tothe boundaries of the square drainage region impliesthat the fracture is aligned directly with two of theadjacent producers. Clearly, this is only one of themany compass orientations that may exist in thefield; if consideration is given to the sweep efficiency of the flood, then this orientation would be the leastdesirable since the sweep efficiency at breakthroughwill be minimal. The most favorable fractureorientation would be the one in which the fractureplane lies along the diagonal of the square drainageregion (Fig. 1). As already mentioned, the fractureorientation may not have a significant effect ontransient data if the fracture lengths are small - butfor long fracture lengths, the effect of the orientationon the pressure behavior of injection wells can besignificant. Thus, it appears necessary to determinethe effect of fracture orientation on the pressurebehavior of fractured injection wells. SPEJ P. 5^" @default.
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• W2057488328 date "1981-02-01" @default.
• W2057488328 modified "2023-10-16" @default.
• W2057488328 title "Analysis of Pressure Data From Vertically Fractured Injection Wells" @default.
• W2057488328 doi "https://doi.org/10.2118/8282-pa" @default.
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