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A pressure casing protection packer

A packer and casing technology, which is applied in the field of new casing protection packers, can solve the problems of uneven force on the rubber cylinder, decreased sealing performance, and no righting function of the packer, so as to achieve reliable setting and improved performance. The effect of sealing performance

Active Publication Date: 2017-08-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] First of all, the conventional packer has no righting function. Under the action of well deviation and gravity, the packer is biased to one side, resulting in uneven stress on the rubber sleeve after the packer is set, and the sealing performance is reduced and it is easy to fail;
[0004] Secondly, due to the influence of water injection pressure fluctuations, backwashing and other working conditions, the pipe string is elongated or shortened, and the casing protection packer is most affected by this, and it is easier to unseal;
[0005] Thirdly, there is no water injection layer on the casing protection packer, and the pulse alternating stress of water injection pressure is superimposed on the peristalsis of the pipe string, which makes the casing protection packer more likely to fail, affects the injection effect, and shortens the service life of the injection string

Method used

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Experimental program
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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the present invention provides a pressure casing protection packer, comprising an upper joint 1 and a lower joint 30, the inner wall of the lower end of the upper joint 1 is threaded with an upper central pipe 23, and the outer wall of the lower end of the upper central pipe 23 is threaded. There is a lower central tube 27, the outer wall of the lower end of the lower central tube 27 is threadedly connected with the inner wall of the upper end of the lower joint 30, the outer wall of the lower end of the upper joint 1 is threaded with an outer cylinder 2, and a sleeve is provided between the outer cylinder 2 and the upper joint 1. The pressure ring 5 on the outer wall of the upper joint 1 forms a square cavity between the pressure ring 5 and the outer wall of the upper joint 1. The square cavity communicates with the liquid inlet hole opened on the upper joint 1. The inner wall of the lower end of the outer cylinder 2 is connected with the uppe...

Embodiment 2

[0020] On the basis of the embodiment, it should be further explained that the lock block 4 fixed in the square cavity by the screw 3 on the pressure ring 5 is provided in the square cavity. An opening is formed between the inner wall of the upper end of the setting head 14 and the outer wall of the liner 11 , and the opening is provided with righting balls 13 , and four righting balls 13 are evenly arranged along the circumferential direction of the liner 11 . The upper and lower contact surfaces of the lock block 4 and the upper joint 1 are respectively provided with a sealing ring, and two O-rings 29 are provided between the outer wall of the well-flushing piston 7 and the inner wall of the outer cylinder 2, and the well-flushing Two O-rings 29 are arranged between the inner wall of the piston 7 and the outer wall of the upper central tube 23, and an O-ring 29 is arranged on the contact surface between the lower end of the setting head 14 and the liner 11. An O-ring 29 is p...

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Abstract

The invention provides a pressure-bearing sleeve protection packer which is designed for improving the sealing performance of a pressure-bearing sleeve protection packer in a directional well. A centering device is additionally arranged, and after setting, four centering balls protrude out of a packer body to be supported on the sleeve wall, so that the packer is centered, the periphery of a sealing rubber cylinder is evenly stressed, and creep of a pipe column is reduced. A pressure-bearing rubber cylinder device is additionally arranged, and after setting, the pressure-bearing rubber cylinder moves upwards, disengages from a pressing cylinder and stretches under the elasticity of the rubber cylinder to be supported on the sleeve wall in an inverted horn mouth mode, so that damage of water injection pressure fluctuation to the sealing rubber cylinder is isolated, and the sealing performance of the sleeve protection packer is substantially improved; a locking block anchors an outer cylinder actively, so that it is avoided that a setting release pin is sheared in water injection, and it is also avoided that setting release occurs due to creep of the packer; meanwhile, a dual-hydraulic setting working mode is adopted for the packer, so that the packer has the functions of reliable setting, setting self-locking and inverse well washing.

Description

technical field [0001] The invention relates to the field of oil field water injection, in particular to a novel casing protection packer used in layered water injection of water injection wells. Background technique [0002] At present, with the deepening of oilfield development, water injection wells are mostly developed in the directional well cluster well group mode. The casing protection packer is the packer on the first stage of the split injection string and above the uppermost water injection layer, which can reduce casing corrosion and casing pressure. [0003] First of all, the conventional packer has no righting function. Under the action of well deviation and gravity, the packer is biased to one side, resulting in uneven stress on the rubber sleeve after the packer is set, and the sealing performance is reduced and it is easy to fail; [0004] Secondly, due to the influence of water injection pressure fluctuations, backwashing and other working conditions, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/126E21B43/20
Inventor 毕福伟巨亚锋于九政罗必林杨玲智王子建王晓娥
Owner PETROCHINA CO LTD
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