Polymer flooding oilfield overall process polymer injection parameter grading optimization decision method

Abstract

The invention relates to a polymer flooding oilfield overall process polymer injection parameter grading optimization decision method. The method comprises the following steps of determining a master control factor and a value range of an optimized target function (an effectiveness speed and a water content decrease integration coefficient); according to the master control factor and the value range, setting a test scheme with n factors at m levels; aiming at each test scheme, according to a value range of an injection parameter, setting a corresponding test scheme with a factors at b levels, and optimizing the injection parameter of each test scheme; according to an optimization result of the test scheme, applying a response curved surface analysis method, regressing an optimized decision model of the injection parameter and realizing a rapid optimization design of a polymer flooding oilfield overall process polymer injection parameter. In the invention, influences of factors of a development stage, a geologic characteristic, an injecting-polymer opportunity and the like on the injection parameter are considered, a target oil field single well polymer injection parameter individuation design is realized, operation is simple, accurate and reliable, and the method has an important meaning for guiding on-site construction, increasing polymer injection quality and improving a polymer injection effect.

Description

technical field [0001] The invention relates to a stage-by-stage optimization decision-making method for injection parameters, in particular to a stage-by-stage optimization decision-making method for polymer injection parameters in the whole process of polymer flooding oil fields applied in the technical field of polymer flooding reservoir engineering. Background technique [0002] For polymer flooding oilfields, optimizing the design of polymer injection parameters is an important task in the process of compiling reservoir development plans, and reasonable polymer injection parameters are the guarantee to achieve the expected polymer flooding development effect. At present, in the process of preparing the actual oilfield reservoir development plan, the test design methods such as comprehensive test, multiple single factor test, Technical or economic indicators such as recovery rate range and economic net present value are used as optimization target values, and the optimal...

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Problems solved by technology

In the optimization process of this kind of method, the impact of the differences in formation physical properties and shot opening degree of each polymer injection well on the design of polymer injection parameters is not fully considered, and it is unreasonable to select a single and the same optimization target parameter in the whole process. The general design stage of the entire oilfield cannot meet the requirements of fine polymer injection

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