A Study of Flow Behaviour of Solution Gas Drive Reservoirs by Using Secondary Methods for Cumulative Production

Solution gas drive reservoirs are characterized by rapid and continuous decline of reservoir pressure. This rapid and continuous decline of reservoir pressure causes a direct decline of reservoir performance at the early stages of the life of the reservoir. The principal energy source, gas liberation from crude oil and the subsequent expansion of the solution gas as the reservoir pressure is reduced is inadequate to produce such reservoirs to their full capacities. Ultimate oil recovery from the natural flow of a solution-gas drive reservoir makes it one of the least efficient primary recovery mechanisms. This leaves a substantial amount of remaining oil residing in the reservoir which must be produced. The practical application of various production parameters and relations to predict the good performance analysis of a solution gas drive reservoir is the primary objective of this study. These parameters include: IPR (inflow performance relation), OPR (outflow performance relation) and PI (productivity index). Predicting the amount of Reserves present in solution gas reservoirs by adapting different techniques. Material Balance for Predicting Primary Recovery of Hydrocarbons from the well. Case study to predict the Inflow Performance relationship of well how pressure is maintained in well. Theoretical data was used to predict the performance behavior of a solution gas drive reservoir from start of production till its abandonment. IPRs and OPRs were developed during the forecasting, over the life of the reservoir. In this work, historical shut-in pressure data acquired was used as the average reservoir pressure to compute the pressure drop due to a particular production rate at any time. The productivity index was then computed. Field data were used to test the model and good results were obtained.