Waterflooding is the primary recovery method used for oil production in Saudi Arabia and is performed through peripheral injection of treated sea water to maintain pressure at the producers. Monitoring of the distribution of the injected water is performed by reservoir simulation and history matching with saturation logs regularly acquired in producing wells. Reliable monitoring of the waterflood process with geophysical methods would benefit field management and optimize production. Long time spans to achieve significant reservoir changes and complexities related to the near surface make this difficult. We describe realistic waterflood scenarios for Saudi Arabian reservoirs and perform modeling studies to analyze the sensitivity of geophysical methods to the parameter changes. Results suggest that borehole gravity methods may have enough sensitivity only at a short distance from the waterfront and in conditions of high porosity. EM methods show the largest sensitivity to the saturation changes and electric field measurements have the largest resolution among EM methods. Surface-to-borehole controlled-source electromagnetic (CSEM) techniques could be effectively employed and repeated over time to implement practical waterflood monitoring in Saudi Arabian reservoirs.
Presentation Date: Monday, September 25, 2017
Start Time: 1:50 PM
Presentation Type: ORAL