Simultaneous Solution Method: Application to an Iranian Southwestern Reservoir and Effect of Different Parameters on the Study

One of the useful methods for interpreting and predicting undersaturated reservoirs performance is simultaneous solution. So using this method initial oil in-place and water influx constant of the reservoir can be estimated. NISOC’s program used for simultaneous solution of the initial oil in-place and water influx constant of a southwestern Iranian undersaturated water drive with no gas cap reservoir. Van Everdingen-Hurst unsteady state model used to match aquifer behavior. Sensitivity analyses show that reservoir pressure and PVT data were the most sensitive parameters respectively. Sensitivity analysis also showed that oil in-place is more sensitive respect to reservoir pressure and PVT data than water influx constant. Eventually, the best rD and tD has been estimated 2.5 and 2.5 respectively. Based on chosen rD and tD, initial oil in-place and water influx constant estimated about 1.13 MMMSTB and 4.54E6 bbl/psi respectively.

Keywords:

Simultaneous solution , water influx constant , initial oil in-place , material balance