DFIT/MiniFrac Analysis of hydraulically fractured dual porosity formations
Waziri, Youssef El
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Several techniques were developed to analyze the after- closure fracture data of a DFIT/MiniFrac test. Majority of these techniques assume that the reservoir is homogeneous. This assumption is not always satisfied: a formation can be heterogeneous and naturally fractured, which makes the published techniques not applicable in this case. A most recent technique by Soliman et al. (2010) presented an analytical solution for an injection- falloff test for a naturally fractured formation. The solution was found to be effective especially in the analysis of MiniFrac tests. However the solution was basically applicable only when there was no residual fracture conductivity. A solution for an injection-falloff test for a naturally fractured and hydraulically fractured formation has been developed. The solution was established by inference using numerical simulation. MiniFrac tests are simulated and analyzed for naturally and hydraulically fractured formations. The study includes infinitely conductive fractures, finite conductivity fractures and radial flow regime. The developed solution was also used to analyze field data. A case of a naturally fractured formation that was hydraulically fractured is examined and presented.