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Expandable packer with mandrel undercuts and sealing boost feature

A packer and undercut technology, applied in sealing/packing, wellbore/well components, earth-moving drilling, etc., can solve problems such as damage and damage to structural sealing performance

Inactive Publication Date: 2013-10-09
BAKER HUGHES HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These design structures may be damaged during operation, which may destroy the sealing performance of the structure

Method used

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  • Expandable packer with mandrel undercuts and sealing boost feature
  • Expandable packer with mandrel undercuts and sealing boost feature
  • Expandable packer with mandrel undercuts and sealing boost feature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 2 The elements of the packer assembly 10 in one embodiment are shown. The mandrel 12 has a tapered portion 14 which forms an undercut 15 on the outer surface of the mandrel 12. The support ring 16 is a component with a split ring 18 in the starting position. The split ring can allow the component 16 to slide on the mandrel 12 and be positioned on the mandrel 12 as shown in the figure. The split ring 18 can be sealed tightly. The combined ring structure is fixed to the mandrel 12. Alternatively, the support ring can slide on the mandrel and then mechanically deform at the tapered portion 14 so that the fingers are flush on the undercut 15. The assembly 16 has alternating fingers 20 and 22, such as figure 1 Shown most clearly. The finger 22 has an end element 24 that spans the gap 26. The gap has a rounded low end 28, so that the stress accumulated in the transition area between the ring 18 and the fingers 20 and 22 can be eliminated. There is a tapered transit...

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PUM

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Abstract

An open hole packer uses mandrel expansion and a surrounding sealing element that can optionally have a swelling feature and further a seal enhancing feature of a ring with an internal taper to match an undercut on the mandrel exterior. As a swage progresses to the taper at the transition between the ring and the extending flat fingers, the fingers get plastically deformed in an outward radial direction to push out the sealing element. Shrinkage of the mandrel axially due to radial expansion brings a ring on the mandrel outer surface under the fingers to act as a support for the fingers against the seal which is pushed against the open hole. Mirror image orientations are envisioned to aid in retaining pressure differentials in opposed directions. Another external mandrel ring extends into the seal to keep its position during differential pressure loading.

Description

Technical field [0001] The technical field of the present invention relates to an open hole packer capable of expansion, especially a packer used for expansion treatment, which can increase the sealing contact pressure and use an external pressure difference to improve the sealing force. Background technique [0002] The packer is installed on the pipe string and must pass through the narrow gap on the existing pipe to reach the position where the packer is arranged. In some cases, the size difference between the offset diameter of the existing pipe (the packer must pass through the pipe) and the predetermined size is so large that it is difficult to achieve a stable sealing effect. When the mandrel expands, the boundary of the expanded pipe can be reached. Some examples of packers that can be expanded can refer to the following patent documents: USP6959759, USP6986390, USP7051805 and USP7493945. [0003] Some design structures rely on component expansion to seal in the presence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/128E21B33/127
CPCE21B33/1208
Inventor 余智光M·K·亚当J·C·威廉姆斯
Owner BAKER HUGHES HLDG LLC