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

A technology of oil-water separator and injection-production in the same well, which is applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems of poor separation effect and inability to be applied in a large scale, and achieve the goal of reducing the cost of water injection Effect

Active Publication Date: 2007-08-29
DAQING OILFIELD CO LTD +1
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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

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

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing:

[0020] Firstly, the basic idea of ​​the present invention is introduced, which is to use a multi-cup iso-flow downhole oil-water separator to make the production liquid of the production layer flow downhole through the settling cup in the separator to naturally settle according to the law of light oil and water weight. , After the water is fully separated, the production fluid with low water content is lifted to the ground by the production pump through the liquid flow channel of the production pump, and the production fluid with high water content is injected back to the injection pump through the liquid flow channel of the injection pump. Therefore, one of the keys to realize the present invention is to fully separate the oil and water, and the second key is to build two independent liquid flow channels and a lifting device compatible with the two liquid flow channels.

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Abstract

The invention is a method for implementing high-water content well same-well injection production by multi-cup uniform-flux underground oil-water separator, characterized in: 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 from each 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...

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Application Information

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IPC IPC(8): E21B43/00E21B43/40
Inventor 王德民王研任龙朱荣杰韩振国
Owner DAQING OILFIELD CO LTD
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