Abstract: When bottom hole flow ing pressure (BHFP) is higher than saturation pressure, oil flows in single phase in the reservoir. When it is lower than saturation pressure, free gas flow oc cures near the wellbore. The well productivity equations for previous two cases are different. When BH FP is lower than the saturation pressure, oil productivity indices at different BHFPs can be determined through Equation (9) in this paper, using the observed production and oil productivity indices at BHFPs above the saturation pressure estimated from Equation (13). The paper also presents pertinent correlations for particular cases, such as undam aged new wells and zero bottom bole flowing pressure.
Two examples show that the correlaions given in the paper are effective in predicting and determining productivities in exploring and producing wells.