Device and method for regulating and controlling water content of production fluid of underground layering of oil field

Abstract

The invention discloses a device for regulating and controlling the water content of the production fluid of an underground layering of an oil field, which comprises a main control assembly, a slide bushing switch and a water content tester, wherein the slide bushing switch is arranged in the main control assembly, and the water content tester is connected with the main control assembly and is used for testing the water content of an oil-water mixture; the main control assembly is used for controlling the opening and the closing of the slide bushing switch according to a test result of the water content; when the condition that the water content is higher than a set value is judged, the slide bushing switch is closed so as to prohibit the pass of the oil-water mixture; and when the condition that the water content is lower than the set value is judged, the slide bushing switch is opened so as to permit the pass of the oil-water mixture. By connecting the device provided by the invention in a layered oil recovery pipe column in series and delivering the device to an underground oil layer, the water content tester can automatically detect the water content of the oil-water mixture. According to the actually detected water content, the slide bushing switch is opened or closed so as to open or close a fluid inlet passage, so that the dynamic regulation and control of the water content of the production fluid of the underground layering of the oil field is realized.

Description

technical field [0001] The invention relates to the technical field of process regulation and control of oil production engineering in oilfields, and more specifically, relates to a device and method for controlling water content in layered liquid production in an oilfield downhole. Background technique [0002] With the continuous growth of science and technology, the development technology of domestic oil fields has already entered the stage of water injection development. The water injection development of oil fields is to use the high-pressure injection water in the water injection wells to drive the crude oil in each reservoir of the oil field to flow into the oil wells, and then mix the oil and water. The liquid is pumped up, and after settling through the ground settling tank, it enters the electric dehydration device for dehydration to obtain crude oil. [0003] Due to long-term water injection, the physical parameters (porosity, saturation, and permeability) of oilf...

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Problems solved by technology

[0006] However, in the above method, since the replacement of the distribution oil nozzle is completely a manual mechanical operation, repeated operations are required, so that the problems of high construction cost, long occupation period and low economic efficiency are caused.

In particular, there is an important problem, that is, changing the nozzle diameter of each layer only plays a certain role in adjusting the liquid production rate of the layer, and cannot change the water content of the liquid produced in the formation flowing into the wellbore.

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