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One of the primary goals of the reservoir management is to enable decisions that maximize recovery from the reservoir. With recent developments in monitoring and control, the opportunity to optimize reservoir production through frequent adjustment of well controls has substantially increased. We recently proposed and demonstrated an improved ensemble-based production optimization method using Conjugate Gradient technique (CGEnOpt) on a synthetic reservoir model. The proposed method results in faster convergence as a result of using the conjugate gradient directions instead of steepest ascent search directions. The net present value (NPV) of a single reservoir is optimized by obtaining the gradient of the NPV from an ensemble of control variables.

In this paper, the benefits and effectiveness of the proposed method is demonstrated on a real field example located off-shore west Africa with 15 …