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
US20070089886A1Inactive Publication Date: 2007-04-26SCHLUMBERGER TECH CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SCHLUMBERGER TECH CORP
Publication Date
2007-04-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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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