Determination of Total Productivity by a Constant Wellbore Pressure Flow Test and the Crossflow Behavior in Multilayer Reservoirs

The single-phase unsteady flow in a multilayer reservoir with crossflow when each layer produces under a constant wellbore pressure is studied. Approximate theoretical expressions for the total flow rate and the crossflows between layers are given and compared with numerical solutions. The crossflow behavior under constant wellbore pressures is discussed. A constant-pressure flow test can be used to determine the total ( kh ) value of the multilayer reservoir.