A method and device for judging the connection status between injection and production wells

Abstract

The invention discloses a method and device for judging the communication state between injection wells and production wells. The method includes the steps of firstly, optimizing unreasonable data points for data of an oil field block to be determined; secondly, calculating the communication coefficient initial value of the oil field block to be determined and the time delay constant initial value of the oil field block to be determined according to the data which are optimized in the first step; thirdly, substituting the data which are optimized in the first step, the coefficient initial value, calculated in the second step, of communication between the injection wells and the production wells, and the time delay constant initial value calculated in the second step into a target function, and calculating the coefficient of communication between the injection wells and the production wells, the time delay constant and the constant of interference between production wells when the value of the target function is smaller than an error of fitting; fourthly, judging the communication state between the injection wells and the production wells according to the coefficient, calculated in the third step, of communication between the injection wells and the production wells, the time delay constant calculated in the third step and the constant, calculated in the third step, of interference between producing wells. By means of the method and the device, the improvement of reasonability of judging of the communication state between the injection wells and the production wells of the high-water-content oil field is facilitated.

Description

technical field [0001] The invention belongs to the field of oilfield injection and production, and in particular relates to a method and a device for judging the connection status between injection and production wells. Background technique [0002] The process of reservoir exploitation is often accompanied by the continuous reduction of reservoir pressure. When the reservoir pressure drops to a certain level, it will affect the exploitation of the reservoir. In order to slow down the reduction of reservoir pressure, water flooding is generally used to supplement the reservoir pressure. The implementation of water injection development often requires multiple water injection wells and production wells to form an injection-production well pattern. Due to the complex geology of the reservoir, the injected water of an injection well drives different production wells to different degrees, that is, the degree of water flooding is different. The degree of water flooding has a g...

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Problems solved by technology

High water-cut oilfields are generally developed with dense well patterns, and the interference between production wells has a great influence on the connectivity between injection and production wells, which cannot be ignored. unreasonable

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