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System, method, and sleeve, for cladding an underground wellbore passage

a wellbore passage and inner surface technology, applied in the direction of sealing/packing, earthwork drilling and mining, borehole/well accessories, etc., can solve the problem of not being suitable for some applications, and achieve the effect of expanding the outer width of the sleev

Inactive Publication Date: 2019-07-11
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method for cladding the inner surface of an underground wellbore passage using an elastic sleeve that is longitudinally stretched using a stretching device and then released to enlarge its outer width and claddle against the inner surface. This allows for the creation of a seal in the wellbore that prevents the passage of fluids or gases. The elastic sleeve can be connected to a stretching device within it and be lowered into the wellbore. The system includes an elastic sleeve and a stretching device.

Problems solved by technology

The packer of US 2011 / 0297400 is not suitable for some applications, as it requires continuous energizing to maintain the packer into sealing engagement with the surrounding surface.

Method used

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  • System, method, and sleeve, for cladding an underground wellbore passage
  • System, method, and sleeve, for cladding an underground wellbore passage
  • System, method, and sleeve, for cladding an underground wellbore passage

Examples

Experimental program
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Effect test

example

[0037]An experiment has been performed by stretching a tubular sleeve 1 with an initial Outer Diameter of 15 cm up to 60%, which generated a significant width decrease that matched calculations. The stretched sleeve 1 was then inserted into a full size Plugging & Abandonment (P&A) testing pipe with an Internal Diameter of 15 cm (6 inch). The stretching tool was subsequently retracted such that the sleeve 1 was also retracted and induced to regain its original diameter. A zonal-isolation test was performed on the sample. Sealing was proven after filling the interior of the sleeve 1 with a conventional Portland class G cement up to a pressure differential of 20 bar dP using nitrogen. At 30 bar dP a leak was initiated, which leak was cured due to the self-healing effect of the sleeve 1.

[0038]It will be understood that the method, system and / or any products according to present invention are well adapted to attain the ends and advantages mentioned as well as those that are inherent ther...

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Abstract

An inner surface of an underground wellbore or wellbore tubular is cladded by an elastic sleeve (1), which is placed by:—lowering the elastic sleeve (1) into the wellbore which sleeve is releasably connected to a stretching device (4) arranged within the sleeve (1) and stretched by the stretching device (4) in longitudinal direction thereby reducing its largest outer width such that it is less than the smallest width of the inner surface surrounding the elastic sleeve (1);—releasing the sleeve (1) from the stretching device (4) thereby enlarging the outer width of the sleeve (1) and cladding the sleeve (1) against the inner surface.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method and system for cladding an inner surface of an underground wellbore passage. The invention further relates to a sleeve for cladding an inner surface of an underground wellbore passage.BACKGROUND[0002]US 2011 / 0297400 discloses an inflatable packer for use in wellbores to isolate specific wellbore regions. The inflatable packer has an expandable bladder which is expanded, e.g. inflated, into sealing engagement with a surrounding surface inside the wellbore (such as the wellbore wall surface). The expandable bladder is pre-manufactured with a radially enlarged section relative to the axial ends of the expandable bladder when the bladder is in relaxed state. The radially enlarged section offers a reduction in required expansion ratio that is required to transition the packer into sealing engagement with the surrounding surface by inflating. Inflating can be accomplished by excersising an axial force along the packer. The pack...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B29/10E21B33/128E21B33/12E21B33/13
CPCE21B29/10E21B33/128E21B33/1208E21B33/13
Inventor RUCKERT, FRANK
Owner SHELL OIL CO