Abstract
Abstract This paper presents techniques for the design and analysis of interference tests when both the active and observation well are intercepted by hydraulic fractures. These techniques are based on new mathematical solutions. The solution is general for any values of dimensionless fracture conductivity including infinite conductivity. The solution is presented in Laplace space; fracture skin, wellbore storage, naturally fissured matrix behavior, etc. are readily included. Any rate or pressure schedule at the active well can be analyzed. Compass orientation of the wells’ hydraulic fractures can be determined from such an interference test. Relative fracture lengths, conductivities, and azimuth significantly affect well performance. Reservoir heterogeneities may significantly alter interference response. The value of knowing hydraulic fracture azimuth can also be determined. Performance of a hydraulically fractured well near a large natural fracture or another hydraulically fractured well is also forecast. Values of fracture conductivity and fracture length for each fracture can not be determined uniquely from the interference response and must be determined seperately.
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