Closed-loop Reservoir Management with Multi-geological Models
CAO Lin1, KANG Zhijiang2, ZHAO Hui1, ZHANG Tong3, LUO Xingwang3
1. College of Petroleum Engineering, Yangtze University, Wuhan 430100, China;2. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;3. Cainan Oilfield Operation Field, Xinjiang Oilfield Branch Company, Fukang 834000,Xinjiang Province, China
Abstract：In view of the limitations of performing closed-loop reservoir management with single model, a novel approach for closed-loop management based on multi-geological realizations is proposed with the combination of reservoir numerical simulation technique. A set of realizations are sequentially updated by the ensemble kalman filter (EnKF) method to honor the measurement data. Then taking the expected NPV of the updated realizations as the objective function, the production optimization process is implemented by the simultaneous perturbation stochastic approximation (SPSA) algorithm. The example application indicates that the proposed method for closed-loop reservoir management can decrease the actual geological uncertainty and provide a reasonable estimate reservoir model, and the calculated optimal controls significantly improve the effect of waterflooding with a higher economic benefits and lower developing risks than normal operation strategies.