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A kcmf type pressure expansion insert seal

An insertion sealing and expansion technology, applied in the direction of sealing/isolation, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of small interference, wear of downhole sealing cylinder, delamination failure, etc., to avoid friction The effect of resistance and

Active Publication Date: 2017-12-12
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase in the use time of separate production and injection strings and the subsequent frequent string operation, the downhole sealing cylinder is severely worn and scratched. The conventional sealing module (rubber cylinder) is not enough to compensate for the downhole tightness due to its small interference. Damage to the envelope, resulting in delamination failure

Method used

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  • A kcmf type pressure expansion insert seal
  • A kcmf type pressure expansion insert seal
  • A kcmf type pressure expansion insert seal

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] The KCMF type pressure expansion insert seal of the present invention includes a sealing module 3, the inner surface of the sealing module 3 is provided with an O-ring 2, and the sealing module 3 is sleeved on the hollow cylinder 1, and the hollow The two ends of the cylindrical body 1 are respectively provided with screw threads 27, which can be connected with the upper production string 28 and the lower production string 29 when entering the well. A spine structure 14 integrated with the hollow cylindrical body 1, a small radial through hole 15 that can be used as a hydraulic transmission passage, and a radial threaded blind hole 16 are sequentially provided downwards. The spine structure 14 can be is 1mm, and the thread angle can be 60°; the radial threaded blind holes 16 are evenly distributed along the circumference, and the number can be set to four; the r...

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Abstract

The invention discloses a KCMF-type pressure-expansible insert seal, comprising a seal module sleeving a hollow cylindrical tube. A thorn structure, a radial through hole and a radial threaded blind hole which are integrated are provided in the outer surface of the hollow cylindrical tube in order from middle to bottom; the outer diameter of the hollow cylindrical tube below the radial through hole is greater than that of the hollow cylindrical tube above the radial through hole, and a junction between the upper and lower portions of the cylindrical tube is provided with a slope; a pressure ring, a rubber tube, a support ring, a limiting ring, a positioning ring and a piston sleeve the hollow cylindrical tube sequentially from the seal module to bottom. The support ring is fixedly connected with the limiting ring through a safety shear pin; the inner wall of the positioning ring is provided with triangular teeth, and the outer wall thereof is provided with trapezoidal teeth; the piston is movably connected with the hollow cylindrical tube through a limiting pin. When slightly corroded and abraded, the sealed tube can be sealed by hydraulic pressure, and unsealing is achieved by lifting up a string; the KCMF-type pressure-expansible insert seal is reusable and suitable for oilfield separate layer water injection or oil injection.

Description

technical field [0001] The present invention relates to an insert seal, more specifically, relates to a KCMF type pressure expansion insert seal. Background technique [0002] At present, the separate production and injection strings commonly used in offshore oilfields are mainly composed of packers, sealing modules, water distributors and other tools. The function of the sealing module is to cooperate with the downhole sealing cylinder to realize the sealing and separation between layers. With the increase in the use time of separate production and injection strings and the subsequent frequent string operations, the downhole sealing cylinder is severely worn and scratched. The conventional sealing module (rubber cylinder) is not enough to compensate for the downhole tightness due to its small interference. Damage to the envelope, resulting in delamination failure. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/128E21B33/126
Inventor 徐国雄刘华伟张伦玮朱橙刘闯周海军
Owner CNOOC ENERGY TECH & SERVICES
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