K344 packer with double-stage packing units

A packer and sealing ring technology, used in sealing/packing, wellbore/well components, earth-moving drilling, etc., can solve problems such as high development cost, interruption of fracturing construction, and difficulty in realization, and overcome the problems of development. High cost and long life effect

Active Publication Date: 2015-01-07
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome that the expandable packer used in the prior art has only one level of isolation unit, and the damage of the packer rubber cylinder during the fracturing construction will directly affect the fracturing construction effect, and even cause the fracturing construction to be damaged. The problem of being forced to stop; and if the stability of the packer setting is only improved by improving the performance of the rubber cartridge, the development cost is high and it is not easy to achieve

Method used

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  • K344 packer with double-stage packing units
  • K344 packer with double-stage packing units
  • K344 packer with double-stage packing units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 The K344-type packer with two-stage packer unit shown includes the first-stage K344-type packer unit and the second-stage K344-type packer unit. The structure of the two packer units is both The existing technology will only be briefly described below. In the present invention, the first-stage K344-type packer unit and the second-stage K344-type packer unit are fixedly connected through the middle joint 15; the first-stage K344-type packer unit is located under the middle joint 15, and the second-stage K344 The type packer unit is located above the middle joint 15. The first-stage K344 packer unit mainly includes the lower joint 24 of the first-stage K344-type packer unit, the glue barrel seat 20 of the first-stage K344-type packer unit, and the first-stage K344-type packer unit. The lower rubber cylinder seat 23, the first-level K344-type packer unit rubber cylinder 22, and the lower center tube 21 and other components. The second-level K344 packer u...

Embodiment 2

[0023] On the basis of Example 1, the first-stage K344-type packer unit and the second-stage K344-type packer unit are respectively connected to the middle joint 15 through threads. The specific connection is as follows: the upper rubber barrel seat 20 of the first-level K344 packer unit is screwed to the lower end of the middle joint 15, and the lower rubber barrel seat 12 of the second-stage K344 packer unit is connected to the upper end of the middle joint 15 部Threaded connection. In this embodiment, in the lower center tube 21, the upper pressure guiding water eye 14 and the lower pressure guiding water eye 18 are sleeved with a sand control pipe 16 to prevent sand from entering the rubber barrel of the packer. The sand control tube 16 is fixed by a circlip 13, which is a standard part, and is fixed in the inner wall groove of the lower central tube 21. The method of fixing by the circlip 13 here is an existing technology in the art and will not be detailed here. Such as F...

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Abstract

The invention provides a K344 packer with double-stage packing units. The double-stage packing units are connected through a middle joint, wherein the lower central pipe of the first-stage packing unit is provided with an upper pressure guiding water hole and a lower pressure guiding water hole; a gap I is formed between the middle joint and the lower central pipe, and the upper end of the gap I is sequentially provided with a slidingly-sealed sealing ring and a limiting ring from top to bottom; the limiting ring and the lower central pipe are fixed through a shear pin, and a gap II is formed between the limiting ring and the lower central pipe; the upper pressure guiding water hole and the liquid inlet hole of the second-stage packing unit are separated on both sides of the sealing ring, and the lower pressure guiding water hole is communicated with the first-stage packing unit through the gap II and a water through hole formed in the limiting ring. When the first-stage packing unit fails, the second-stage packing unit can be opened automatically under the action of the pressure difference of an oil jacket and meanwhile close the liquid inlet channel of the first-stage packing unit to achieve alternation of the double-stage packing units, thereby guaranteeing reliable setting and packing of the packer and prolonging the service life of the packer.

Description

Technical field [0001] The invention belongs to the technical field of downhole tools for downhole operations in oil and gas wells, and specifically relates to isolation devices for underground use. It is one of the main tools for oil and gas field testing and gas testing, and is especially applied to continuous hydraulic injection of moving pipe strings. As a bottom packer for fracturing construction, a K344 packer with two-stage packer unit. Background technique [0002] Packers are an indispensable downhole tool for the reconstruction of low-permeability oil reservoirs. In recent years, in order to further improve single-well production and shorten the operation cycle, and to more effectively reconstruct the reservoir, research on downhole fracturing tools has been carried out. Such as Figure 5 As shown, the expandable packers frequently used in construction at present include upper joint 1, lower joint 7, upper rubber tube seat 2, lower rubber tube seat 3, rubber tube 4, cent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
CPCE21B33/122
Inventor 张文周丰孙虎王祖文苏敏文邓小强隆世明田文超杜加玉许建伟柳瑞军李星星廖作杰安永江
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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