Method for improving oilfield injection-production matching degree

Abstract

The invention discloses a method for improving the oilfield injection-production matching degree. The method comprises the following steps: S10, establishing an objective function and constraints of injection-production parameter index optimization; S20, rapidly generating a super-dimensional sampling sample by adopting a time-first super-dimensional sampling method, and solving a primary optimalinjection-production parameter; S30, taking the primary optimal injection-production parameter as an initial value, optimizing the optimal injection-production parameter by adopting a gradient approximation method, and recording an unexpected search direction angle set; and S40, using the unexpected search direction angle set for cooperating with synchronous reverse search, eliminating local optimum, and obtaining final injection-production parameters. The method is used for oil reservoir exploitation; the oil reservoir injection-production parameter calculation period is greatly shortened; more accurate injection-production parameters are obtained through secondary optimization; the injection-production parameters are substituted into an oil reservoir injection-production model, more accurate injection-production indexes such as accumulated oil production, moisture content or production degree are obtained through calculation, and refined guidance is provided for work of each stage ofoil field injection-production, so that the matching degree of oil field injection-production is improved, the oil reservoir water flooding recovery rate is increased, and the injection-production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a method for improving the matching degree of injection and production in an oil field. Background technique [0002] At present, based on the existing production conditions, the main way to achieve economical and efficient development of oil resources is to improve the matching degree of injection and production in oilfields so that the reservoir development dynamics are in an optimal state in real time. Therefore, research on optimization of reservoir production parameters based on improving the degree of injection-production matching in oilfields continues to develop. Carrying out research on this technology is crucial to reducing the uncertainty and risk of reservoir development, improving the degree of injection-production matching in oilfields, and improving the level of reservoir management It has important theoretical and application value to reduce the cost of o...

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Problems solved by technology

However, stochastic gradients can only provide a rough approximation of the true gradient; although stochastic gradients obtained by proper methods can guarantee a constant upward direction for maximization problems, studies have shown that stochastic gradients are still far from their true gradient directions; and Slow approach to optimal solution

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