Reservoir Injection-production Parameter Optimization Method Based on Uncertain Geological Model

Abstract

The invention provides a method for optimizing reservoir injection-production parameters based on an uncertain geological model. By establishing an optimization objective function, the gradient of the net present value of each geological model is calculated separately and the mathematical expectation of the gradient of the net present value is solved to adjust each geological model. The maximum value of the optimized objective function can be obtained by using the injection-production parameters, and the optimal solution of the reservoir injection-production parameters can be inversely obtained by using the maximum value of the optimized objective function. This method separately calculates the net present value gradient of each geological model and solves the mathematical expectation of the net present value gradient, fully considers the parameter difference of each model, makes the net present value gradient more accurate, so the mathematical expectation of the final net present value The expected maximum value is also closer to the actual situation, which reduces the risk of reservoir development and investment adjustment; in addition, the processing method of calculating the net present value gradient of each model in this method is particularly suitable for parallel computing, which objectively improves the computing speed .

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a method for optimizing reservoir injection and production parameters based on an uncertain geological model Background technique [0002] Reservoir development and production optimization technology refers to the establishment of optimal control equations, constraints, and objective function equations for the reservoir production process based on the optimal control theory to form an optimal control mathematical model for reservoir production optimization. Production system optimization process. Obtaining the relationship between the change of injection-production parameters (oil production, water production, water injection) and the objective function is the core of optimization. The injection-production parameters can be calculated by numerical simulation or reservoir engineering. The calculation process of the reservoir engineering method is to establish the math...

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems of production optimization based on a single deterministic geological model in the above-mentioned prior art, the optimization effect obtained by using the synchronous disturbance stochastic approximation algorithm is not good and the gradient solution results are inaccurate, which makes reservoir development and investment adjustment risky. The invention provides a reservoir injection-production parameter optimization method based on an uncertain geological model, the specific scheme is as follows:

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