Optimization of Two Simultaneous Water and Gas Injection Scenarios in a High GOR Iranian Oil Field

Summary Gas Oil Ratio (GOR) is one of the most important production parameters in oil reservoirs. GOR increase may lead to shutting-in the wells due to being uneconomic. The main goal of this study is to investigate two simultaneous water and gas injection scenario in a real fractured oil field with high producing GOR. This field is located in the south-west of Iran and the production from this field was started in 2013. A dynamic reservoir model was built by using the reservoir properties, reservoir fluid model, reservoir geometry, relative permeability and production data. A history match was conducted to validate the reservoir model for future forecasts. After validating the model, two scenarios were investigated including 1) one water injection well and two gas injection wells and 2) one gas injection well and two water injection wells. Then, an optimization study was conducted on each scenario. Production rate, water and gas injection rate, status of the wells were optimized. This optimization caused improved oil recovery of each scenario. The scenario with two water injection wells has better results than the other one due to the controlling gas oil ratio and preventing of production wells shut-in.