Method for depicting effect of cumulative reduction of water content of heterogeneous profile control and flooding

Abstract

The invention provides a method for depicting the effect of cumulative reduction of the water content of heterogeneous profile control and flooding. The method comprises the steps of: regularly collecting the injection amount of an injection well, and the water production amount and the liquid production amount of an output well; calculating the water content of a heterogeneous profile control and flooding well group and the cumulative injection amount of a heterogeneous profile control and flooding system; calculating regularly the change amplitude of the water content of the output well; drawing a scatter diagram of the change amplitude of the water content and the cumulative injection amount of the heterogeneous profile control and flooding system; after determining when the water content of the output well reaches the minimum value, dividing the profile control and flooding effect taking stage; conducting linear regression on the change amplitude of the water content and the cumulative injection amount of the heterogeneous profile control and flooding system; determining the absolute effect taking time and the maximum change amplitude of the water content of heterogeneous profile control and flooding; drawing a relation curve of the theoretical value of the water content of water flooding and the cumulative injection amount of the heterogeneous profile control and flooding system; lengthening and intersecting the straight line of the change amplitude of the water content of the heterogeneous profile control and flooding well group with the straight line of the theoretical water content of water flooding; and solving the area defined by the straight line of the water content of heterogeneous profile control and flooding and the straight line of the theoretical water content of water flooding, and determining the cumulative precipitation effect of profile control and flooding. Data acquisition is simple and scientific, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of improving water flooding and enhancing oil recovery, and in particular relates to a method for describing the cumulative water cut reduction effect of heterogeneous phase regulating flooding. Background technique [0002] Heterogeneous phase modulation flooding is one of the important measures to improve water flooding effect and oil recovery in the middle and late stage of high water cut oilfield development. As more and more oilfields in production in my country gradually enter or have entered the medium-high water cut period, the application of this technology needs to be more and more important. The heterogeneous phase modulation and flooding technology expands the injected heterogeneous system underground to block the dominant seepage channel, so as to reduce the water cut of the oil well and increase the oil production. The greater the reduction of the water cut of the oil well, the better the effe...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for describing the cumulative water cut reduction effect of heterogeneous phase control and flooding, so as to solve the technical problem that it is difficult to systematically and quantitatively characterize the effect of heterogeneous phase control and flooding to reduce water content

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