A type k344 packer with two-stage packer unit

A packer and sealing ring technology, which is applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as high development cost, interruption of fracturing construction, and influence on fracturing construction effect, and achieve Effect of prolonging service life and overcoming high development cost

Active Publication Date: 2016-09-14
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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  • A type k344 packer with two-stage packer unit
  • A type k344 packer with two-stage packer unit
  • A type k344 packer with two-stage packer unit

Examples

Experimental program
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Effect test

Embodiment 1

[0021] like figure 1 The K344 type packer with dual-stage packer unit shown includes the first-stage K344-type packer unit and the second-stage K344-type packer unit, and the two packer units are of the same structure. The prior art 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 type packer unit is located above the mid-joint 15. The first-stage K344 packer unit mainly includes the lower joint 24 of the first-stage K344-type packer unit, the glue cylinder seat 20 of the first-stage K344-type packer unit, and the first-stage K344-type packer unit. The lower rubber barrel seat 23, the first-stage K344 packer unit rubber barrel 22 and the lower central pipe 21 and other components. The second-stage K344 packer unit mainly includes the upper joint 8 of the second-stage K344-type packer unit, the glue cylinder seat 9 of the sec...

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 with the middle joint 15 by screws. The specific connection is as follows: the upper rubber barrel seat 20 of the first-stage K344 packer unit is threadedly connected to the lower end of the middle joint 15, and the lower rubber barrel seat 12 of the second-stage K344 type packer unit is connected with the upper end of the middle joint 15. threaded connection. In this embodiment, the lower central pipe 21 is sleeved with a sand control pipe 16 at the upper pressure guide water hole 14 and the lower pressure guide water hole 18 to prevent sand from entering the rubber cylinder of the packer. The sand control tube 16 is fixed by the circlip 13, which is a standard part and is fixed in the inner wall groove of the lower center tube 21. The method of fixing by the circlip 13 is the prior art in the art, and will not be described in detail he...

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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 used for downhole operations in oil and gas wells, and in particular relates to an isolation device for underground use. The fracturing construction is a K344 packer with two-stage packer unit as the bottom packer. Background technique [0002] Packers are an indispensable downhole tool for reservoir stimulation in low-permeability oil reservoirs. In recent years, in order to further improve single-well production and shorten the operation cycle, to carry out more effective stimulation of reservoirs, research on downhole fracturing tools has been carried out. like Figure 5 As shown in the figure, the expansion packer often used in the current construction includes an upper joint 1, a lower joint 7, an upper rubber barrel seat 2, a lower rubber barrel seat 3, a rubber barrel 4, a central pipe 5, a liquid inlet hole 6 and a liquid inlet channel etc. When the expanding packer goes down to t...

Claims

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Application Information

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Patent Type & Authority Patents(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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