Introduction to a Method to Obtain Formation Pressure by Pressure Build-Up Curves and Some Characteristics of Formation Pressure in Multi-Zone Heterogeneous Reservoirs of Daqing Oil Field

摘要

This paper introduces the theoretical basis, derivation of thernformulas and actual procedures of a method to obtainrnformation pressure by pressure build-up curves. The formationrnpressure can be average pressure in the drainage area, averagernpressure at the boundary, pressure when there are faults nearrnthe well, pressure for closed boundary conditions and waterrndrive (with different injection – production ratios). Thisrnmethod is quite versatile, accurate and simple in procedure.rnDaqing Oil Field has used this method for more than 40 yearsrnto calculate formation pressure more than 1 million times.rnDaqing Oil Field is very heterogeneous, has multi-zones andrnthe zones are not very continuous between wells. Therncharacteristics of formation pressure of this type of reservoirrnare quite different from that of homogeneous single-zonernreservoirs. Field data and history curves are shown to point outrnthe special characteristics of formation pressure of this typernof reservoir.