Optimal water injection method for irregular well pattern based on planar displacement component

Abstract

The invention discloses an optimized water injection method for irregular well pattern based on plane displacement component. The injection-production unit is divided with the oil production well as the center, and the triangular injection-production unit is formed with the corresponding water injection well. Taking the injection-production unit as the research object, considering the plane heterogeneity of the reservoir, the multi-flow tube method was used to calculate the water-flooding swept area in different displacement directions in the injection-production unit. Finally, considering the plane heterogeneity of the reservoir and the swept area of ​​water flooding in different displacement directions, the plane displacement component coefficient is obtained, and the water injection volume required by water injection wells in different directions in the injection-production unit is calculated. On the basis of theoretical research, a plane displacement component coefficient chart is formed, which is used to guide the dynamic allocation of water injection wells in oil fields. Through practical application in mines, a good effect of precipitation and oil increase has been achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum development and reservoir engineering, in particular to a water injection method for plane optimization of irregular well pattern. Background technique [0002] There are two traditional methods for determining the water injection volume of water injection wells on the plane: (1) The liquid production volume of the effective oil well is divided equally according to the number of corresponding injection wells to obtain the water injection volume of the water injection well; (2) the liquid production volume of the effective oil well is calculated. According to the proportional relationship between injection and production well spacing, the water injection volume of the water injection well is obtained. However, the above methods lack theoretical basis and low precision, and are not suitable for water injection under irregular well pattern conditions. SUMMARY OF THE INVENTION [0003] In order t...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides an irregular well pattern optimization water injection method based on the plane displacement component, which solves the problem that the traditional plane water injection technology in the prior art is difficult to obtain optimal water injection in the irregular well pattern. Problems of water injection effect and low precision

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