Well Test Analysis in Naturally Fractured Reservoirs Using Elliptical Flow

Some naturally fractured reservoirs can exhibit linear flow in<br>the beginning as if it were hydraulically fractured. The linear<br>flow may have been imparted as a result of limited<br>connectivity in the well’s drainage area, thus creating<br>formation anisotropy and/or heterogeneity. The primary<br>purpose of this study is to develop a welltest interpretation<br>method to quantify anisotropy in naturally fractured<br>reservoirs. The method, which is based on an elliptical flow<br>model, is extended to hydraulic fractures with infinite<br>conductivity.