Method for optimizing steam huff-puff injection parameters based on approximation model

Abstract

The invention relates to a method for optimizing steam huff-puff injection parameters based on an approximation model. The method comprises the steps that (1) a steam huff-puff three-dimensional numerical reservoir simulation model is established; (2) four injection parameters including steam injection dryness, a steam injection temperature, a steam injection speed and a cyclic steam injection amount are selected as designed optimization variables; (3) initial value scopes are selected for the injection parameters; (4) an experimental design method is used to select sample points aiming at the steam huff-puff injection parameters; (5) the steam huff-puff three-dimensional numerical reservoir simulation model is used to conduct numerical simulation computation of the sample points; (6) target functions are selected, and the injection parameters of each sample point and corresponding target function response values are used to establish the approximation model which represents the steam huff-puff injection parameters; (7) accuracy of the approximation model is verified, the step (8) will be conducted if accuracy requirements are satisfied, and the step (3) will be restarted if the accuracy requirements cannot be satisfied; and (8) global optimization is conducted to the injection parameters through a genetic algorithm, so that the optimal steam huff-puff injection parameters can be obtained.

Description

technical field [0001] The invention relates to an approximate model-based steam stimulation injection parameter optimization method, which belongs to the technical field of oilfield steam stimulation development. Background technique [0002] Steam huff and puff is an effective method to enhance oil recovery in heavy oil reservoirs. It mainly injects steam with a certain degree of dryness, then shuts down the well and brines the well, and then opens the well to discharge fluid for oil recovery after a few days. The use of steam huff and puff can reduce the viscosity of crude oil and improve the fluidity and production capacity of heavy oil. The parameters of steam huff and puff injection affect the development effect of thermal recovery. In order to obtain the optimal development effect of thermal recovery, the design of thermal recovery development plan needs to optimize the injection parameters. The current optimization of steam stimulation injection parameters is mainly...

AI Technical Summary

Problems solved by technology

This method is time-consuming and laborious, and cannot fully consider the interaction between injection parameters. The optimization parameters are often the previous design values, and it is difficult to obtain the best combination of injection parameters.

Orthogonal test design method can reduce the number of tests, but it cannot obtain the best combination of injection parameters in the entire range of injection parameters, the optimization results are not continuous, and the reliability is poor

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