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Shrinkage compensated seal assembly and related methods

a sealing assembly and compression technology, applied in sealing/packing, mechanical equipment, borehole/well accessories, etc., to achieve the effect of reducing tolerances, high energizing sources, and increasing costs

Inactive Publication Date: 2014-05-15
VETCO GRAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an apparatus / assembly and methods of compensating for shrinkage of a seal assembly that does not require an excessively high energizing source and / or requirement for specially made seal material. The invention includes a seal, compression members, and a plurality of floating pin members that can reduce the surface area of the exposed portion of the seal, resulting in a requirement of less force to energize the packing. The floating pin members can also improve the ability of the packing to maintain a seal at a reduced packing volume and / or volume-dependent compressive force caused by low temperatures. The invention can compensate for shrinkage in interference elastomer seal applications and provide a bi-directional capability. The invention can be used in high temperature pack off and is positioned within a recess in the casing head or a confined space to restrict movement of the pin members.

Problems solved by technology

Advantageously, when used, for example, in a high temperature pack off, the floating pin members can reduce the surface area of the exposed portion of the seal, which results in a requirement of less force to energize the packing, especially when the annular area of the packing is large.

Method used

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  • Shrinkage compensated seal assembly and related methods
  • Shrinkage compensated seal assembly and related methods
  • Shrinkage compensated seal assembly and related methods

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Embodiment Construction

[0028]The present invention will now be described more fully hereinafter with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout. Prime notation, if used, indicates similar elements in alternative embodiments.

[0029]As production of oil and gas occurs at greater water and surface depths the temperature variation becomes wider and more critical to the effectiveness of elastomer seals. Accordingly, a constant effectiveness of the seal 43, especially at higher pressures, has become more desirable. Various embodiments of the present invention provide compensation for the behavior of the ...

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Abstract

Shrinkage compensated seal assemblies and methods of compensating for shrinkage of a seal due to temperature variations, are provided. According to an exemplary shrinkage compensated seal assembly, the assembly includes a seal, a first compression member for engaging the upper surface of the seal, a second compression member for engaging the lower surface of the seal, and a plurality of pin members each having an elongate body and a head portion. The elongate body of each separate one of the plurality of pin members slidably extends through a different one of a plurality of sets of apertures in the first compression member, the seal, and the second compression member to provide for maintaining a substantially constant pressure on the seal at given pressure under varying temperature conditions that result in variations in the volume size of the seal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to seal assemblies, in general, and to seal assemblies having seal material that undergoes a substantial volume change resulting from varying temperatures at given pressures, in particular, and methods of compensating for seal shrinkage due to varying temperatures at given pressures.[0003]2. Description of the Related Art[0004]Casing hanger seal assemblies, often referred to as slab packing, pack-off, etc., are provided to prevent well fluid from escaping through the casing head. The force necessary to energize the seal packing is equivalent to the pressure to be contained multiplied by the exposed surface area of packing of the seal in compression. The exposed surface is the portion facing downwards towards the casing hanger slip bowl and / or the opposite upward facing surface. As the exposed surface area is reduced, the force required to energize the seal packing to contain a certain pressure is ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B33/12
CPCE21B33/12F16J15/068F16J15/064F16L21/08
Inventor KOLEILAT, BASHIR MOHAMMADOLVERA, ALFREDAL-AKKAD, AMANHWANG, JIMKAJARIA, SAURABHHEGDE, GAJANAN
Owner VETCO GRAY
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