Method for realizing high-water containing same-well injection-production by multi-cup equi-flow type down-hole oil-water separator

Abstract

The invention relates to a method for implementing high-water content well same-well injection production by multi-cup uniform-flux underground oil-water separator, characterized by: using multi-cup uniform-flux underground oil-water separator to make the produced liquid from the extracted bed automatically deposit when underground flowing through the separator, after the oil and water are separated fromeach other, using two lifters to lift and reinject through the respective independent flow channels and the two lifter are respectively called extraction pump and injection pump, the produced liquid with low water content is lifted by the extraction pump through the flow channel of the extraction pump up to the ground and the produced liquid with higher water content is reinjected by the injection pump through the flow channel of the injection pump into the injection bed. And it can perfectly complete underground separation of oil and water, implement economic and effective extraction for high-water content wells and implement water injection for other oil beds in the same well site at the same time.

Description

Technical field: [0001] The invention relates to an oil production method for high water-cut oil wells in the field of oil field development, in particular to a method for realizing injection and production of high water-cut wells in the same well by utilizing multi-cup iso-flow downhole oil-water separators. Background technique: [0002] In the late stage of development of heterogeneous multi-layer reservoirs, there are more and more high water-cut wells. Many of these wells have water cuts as high as 98%, reaching or approaching the economic and technical limit of production, and cannot be economically and effectively produced. In order to solve this problem, some technicians proposed to use the same well injection and production process, that is, to separate oil and water downhole, and inject the separated water into the non-production layer downhole, so as to reduce the water content of the wellhead production fluid. The downhole oil-water separation device currently us...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the same well injection and production technology of high water-cut wells cannot be applied on a large scale due to the poor separation effect of the existing downhole centrifugal oil-water separator, the present invention provides a downhole oil-water separation method using multi-cup iso-flow type A method for realizing injection and production of high water-cut wells in the same well and a specially designed string for implementing the method

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