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Expandable Sleeve

a sleeve and expandable technology, applied in the direction of sealing/packing, fluid removal, borehole/well accessories, etc., to achieve the effect of reducing the tendency of the tubular body to relax and thin material

Inactive Publication Date: 2007-04-26
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] To assist in achieving good expansion ratios for the sleeve, the tubular body can have a corrugated structure prior to expansion.
[0020] By providing the internal spring structure, the tendency of the tubular body to relax is resisted. Also, the spring can provide mechanical support allowing potentially thinner material to be used.

Problems solved by technology

Certain problems are identified with such a construction.

Method used

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Examples

Experimental program
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Embodiment Construction

[0035] Expandable sleeves in accordance with the invention are particularly useful in wells such as oil and gas wells. They can be applied during the well construction process to stabilise the formation through which the well is drilled, or after completion to repair damage or to seal off perforations that are producing unwanted fluids. Other uses will be apparent.

[0036] Referring to FIGS. 1-3, the embodiment of the invention shown comprises a sleeve constructed in three layers; an outside layer 10, and intermediate layer 12 and an internal layer 14. In FIGS. 1-3, the sleeve is installed in a well that has been completed with a steel casing 16 secured in the well by cement 17 to provide zonal isolation and physical support. Communication with the producing formation 19 is via perforations 18 formed through the casing in the usual manner.

[0037] The outside layer 10 comprises a thin layer of a sealing compound such as natural or synthetic rubber. The exact material will be selected ...

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PUM

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Abstract

An expandable sleeve for use in a well, comprises a tubular structure including an external sealing layer comprising a compliant material; an intermediate expandable tubular body made from a plastically deformable material; and an internal spring structure such as a helically wound spring; wherein the external sealing layer is disposed on the outer surface of the tubular body, and the internal spring structure is disposed inside the tubular body and acts so as to exert a radial force on the body when in an expanded state. Such a sleeve can be used to seal off perforations and in well completions using slotted liners or in drilling applications.

Description

TECHNICAL FIELD [0001] This invention relates to an expandable sleeve of the type that are generally used for lining oil or gas wells. BACKGROUND ART [0002] Expandable sleeves have been known for some time in the oil and gas industry as a technique for lining and stablising wells for the production of fluids. In use, the sleeve is introduced into the well in a contracted form and then expanded until it contacts the wall of the well bore. Expansion can be achieved by a number of means, including inflation with compressed fluid or cold working with a mandrel or rotating expansion tool. The advantages of expandable sleeves (sometimes called ‘expandable tubulars’ or just ‘expandables’) are well known. In cased wells, expandables can be used to shut off perforations or close other holes in the casing. In open hole, expandables can be used to stablilise the well. Expandables have also been used to shut off perforations in steam injection wells as is discussed in US 2003015246 A. One appro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B23/00
CPCE21B29/10E21B43/108E21B43/103E21B33/124
Inventor ORBAN, JACQUESVERCAEMER, CLAUDE
Owner SCHLUMBERGER TECH CORP
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