VARIATION OF SATURATION PRESSURE VALUES IN MISHRIF AND ZUBAIR RESERVOIRS IN RUMAILA OILFIELD, SOUTHERN IRAQ
Reservoir fluid, pressure volume temperature properties such as bubble point pressure, gas solubility, oil and gas formation volume factors, and viscosities are important elements in the reservoir management and field development. Therefore, this study aims to distribute the bubble point pressure on the main oil reservoirs in the Rumaila oilfield, laboratories tests results from 103 pressure volume temperature reports were used, these tests were obtained from the Mishrif, Upper Shale and Main pay reservoirs. Pressure gradient in the study area was defined using Surfer14 software, and in order to avoid the variation of low-pressure areas in the future drilling wells plan, continuous monitoring and focus on these areas, pressure maps were drawn then reading graduation of pressure on these maps to obtain final formula to adopt a specific range of saturation pressures values and distribute them among Rumaila oilfield. The study also compares between the main sub-units of the Main pay reservoir and Mishrif reservoir in the North Rumaila and other reservoirs in the South Rumaila oilfield as well as to define other factors in pressure volume temperature reports such as gas oil ratio, viscosity and formation volume factor that contribute to the saturation pressure variation.