A Calculation Method of Critical Production for Oil Wells in Thick Reservoirs with Bottom Water

In order to effectively develop the thick reservoirs with bottom water where the fluids filtrate in three dimensions,a calculation formula of critical production in thick oil layers was derived according to the stable seepage theory,and taking near-well three-dimensional flow approximately as spherical centripetal flow.The formula has been verified by a practical case.Using the new formula,the influences of oil layer thickness,perforating thickness and vertical permeability on critical production were studied.The results showed that the critical production increased with the increase of reservoir thickness and vertical permeability,and increased and then decreased with the increase of perforating thickness.These conclusions can be helpful for controlling the production of oil wells properly in thick reservoirs with bottom water.