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Well washing method of hierarchical water injection well and its underwell tubular column

A layered water injection and downhole string technology, applied in the direction of wellbore/well components, drill pipe, casing, etc., can solve the problems of water injection layer collusion, pressure difference between layers, failure to achieve the purpose of layered water injection, etc. , to achieve the effect of reducing production cost, improving reliability and improving water injection effect

Inactive Publication Date: 2007-02-14
OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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AI Technical Summary

Problems solved by technology

[0003] 1. During water injection, when the injection pressure difference between layers is large and the pressure in the pipe is not enough to press the well flushing valve, there will be collusion between the injected water layers, and the purpose of layered water injection will not be achieved.
[0004] 2. When the injection is stopped, due to the pressure balance inside and outside the pipe, and there is a pressure difference between the layers, the well flushing valve is opened, resulting in cross flow between the layers

Method used

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  • Well washing method of hierarchical water injection well and its underwell tubular column
  • Well washing method of hierarchical water injection well and its underwell tubular column

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, the present invention is described in further detail: see figure 2 , the well flushing method of layered water injection wells, the water injection string is run into the layered string, the well flushing water flows down from the oil casing annulus, the water injection string is lowered into the layered string, and the passage between them is controlled by the sealing mechanism Sealing; the well flushing water flows downward from the oil casing annulus, flows through the open channel, and returns upward from the bottom pipe of the water injection string. In the well flushing method of the present invention, the passage is opened by lifting and unloading the water injection string before the well flushing, and the passage is closed by putting and lifting the water injection string after the well flushing.

[0015] The downhole string of the layered water injection well using the above well cleaning method, see figure 1 ,...

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Abstract

A method for washing the hierarchical water-injection well features that the water-filling pipe column is lowered down in the hierachical pipe column to open the sealed channel, the water is then filled to make it flow through ring space of oil sleeve tube, sealing channel and the lower end pipe for returning upward, and the water-filling pipe column is lifted up to close said sealed channel. Its underground pipe column system is composed of the hierarchical pipe column consisting of packers and sand-preventing pipe and the water-filling pipe column consisting of water distributors and connecting pipes.

Description

technical field [0001] The invention relates to oil production technology and equipment in the petroleum industry, in particular to a well-flushing method for a layered water injection well and a downhole pipe string, which is suitable for layered water injection wells. technical background [0002] For a long time, in the process of downhole layered water injection in oilfields, the downhole water injection layer and pipe string have been blocked due to water quality, scaling and other reasons, and regular well cleaning operations have to be performed to remove the blockage. The used layered water injection string is equipped with washable well packers, see "Oil Production Engineering Handbook" August 2000 first edition, Beijing Petroleum Industry Press, page 55-68 "layered water injection tools and The initially used expandable packer has been seldom used due to its short service life of the rubber cartridge, and now the so-called flushable packer with well flushing valve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/03E21B17/00E21B43/20
Inventor 王世杰王世虎王民轩孙宝泉张雪梅申强刘殷韬
Owner OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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