Simultaneous Solution Of Oil-In-Place And Water-Influx Parameters For Partial Water Drive Reservoirs With Initial Gas Cap

SIMULTANEOUS SOLUTION OF OIL-IN-PLACE AND WATER-INFLUX PARAMETERS FOR PARTIAL WATER DRIVE PARAMETERS FOR PARTIAL WATER DRIVE RESERVOIRS WITH INITIAL GAS CAP The application of Newton Optimization technique to volumetric balance equation is introduced. This is to determine, simultaneously, the original oil-in-place and water influx, using historical performance data of a petroleum reservoir. Equations are presented in a general manner so that the reader, familiar with matrix calculations, can easily apply them to any aquifer model. As a field example, an unsteady-state exponential form of water influx has been used to describe the aquifer performance of Haft Kel Field of Iran. performance of Haft Kel Field of Iran. The limitation of sum square deviations of oil-in-place as a basis for optimization has been described. Instead, the sum square deviations of cumulative reservoir withdrawals has been used for optimization which has accomplished satisfactory results. The limitations of the method and the effect of its underlying assumptions have been discussed.