Constant Pressure Injection Test in a Fractured Reservoir-History Match Using Numerical Simulation and Type Curve Analysis

Water was injected at constant pressure into a single well in a fractured reservoir for a period of 32 days followed by a 9 day shut-in period. Intake volumes of the injection well and pressure responses in 19 surrounding wells were recorded during the entire test. Type curves were generated by numerical and semi-analytical techniques to facilitate reservoir characterization from the constant-pressure, declining-rate injection data. A single-phase, three-dimensional, semi-compressible simulator was developed and used to match the field results. The fracture orientation trend of the reservoir was determined, and reservoir permeability and effective fracture length were calculated for the injection well. Type-curves are presented for use in evaluating the constant terminal pressure case for fractured wells.