Alkaline/surfactant/polymer combinational flooding optimization method based on parallel self-regulation differential evolution

Abstract

Alkaline / surfactant / polymer combinational flooding is an important tertiary oil recovery technology, and the invention provides an alkaline / surfactant / polymer combinational flooding optimization method based on parallel self-regulation differential evolution in order to scientifically formulate a development scheme and obtain better economic benefits. According to the method provided by the invention, firstly, a net present value is taken as a performance index, a seepage equation of an oil phase and an aqueous phase and a convective diffusion adsorption equation of alkaline, surfactant and polymer are taken as governing equations, a flooding agent coordination equation, a physicochemical parameter algebraic equation and a flooding agent boundary condition are taken as constraint equations, and the injection concentration of each flooding agent is taken as an optimization variable to establish an optimization model; secondarily, in order to improve the global and local search capability of a traditional differential evolution algorithm, improve a rate of convergence, and avoid entering local optimum, a parallel strategy is introduced into an evolutionary process and self regulation is carried out on a zoom factor, so that a new parallel self-regulation differential evolution algorithm is introduced; and finally, the algorithm is utilized to optimize the injection concentration of an alkaline / surfactant / polymer combinational flooding model so as to obtain an optimal injection and recovery strategy.

Description

1. Technical field [0001] This technology belongs to industrial optimization technology, which involves the use of improved intelligent algorithm to improve oil recovery of ASP flooding, specifically, it is an optimization method of ASP flooding based on parallel self-adjusting differential evolution. 2. Background technology [0002] Since the 1990s, the water cut of my country's mature oilfields has reached over 80%, and the recovery rate of recoverable reserves has reached 63.1%. Generally speaking, it has entered the stage of high water cut and high recovery rate. How to further increase oil recovery and vigorously develop tertiary oil recovery technology has become a top priority for the development of the petroleum industry. However, with the development of production, the difficulty of production increases, the recovery rate of single polymer flooding or chemical flooding is getting lower and lower, and the quality of oil is gradually declining. Therefore, among many ...

AI Technical Summary

Problems solved by technology

However, differential evolution has poor local search ability, and it is easy to fall into local optimum and premature convergence. Therefore, a processing method of parallel population and scaling factor self-adjustment is proposed to improve the solution effect of differential evolution algorithm.

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