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Contractable and expandable tubular wellbore system

A tubular and wellbore technology, applied in the field of tubular systems arranged in a wellbore, can solve problems such as low collapse resistance of tubular fittings

Inactive Publication Date: 2007-04-11
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of the known system is that, in the expanded state, the collapse resistance of the pipe is lower than that of conventional pipes without hinges

Method used

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  • Contractable and expandable tubular wellbore system
  • Contractable and expandable tubular wellbore system
  • Contractable and expandable tubular wellbore system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Referring to Figure 1, Figure 1 shows a wellbore casing, in the form of a tubular member 1, which is to be installed in a wellbore (not shown) which has been drilled in the formation so that the tubular member 1 is in its final position Either directly surrounded by rock formations (not shown), with an optional cement binder or rubber jacket in between, or by additional wellbore tubulars. The tubular member 1 is referred to below as "outer tube 1" to distinguish it from the "inner tube" below.

[0016] The outer tube 1 has five arcuate sections 2, 3, 4, 5, 6, which have relatively thick walls, and five short sections 7, 8, 9, 10, 11 interconnecting the arcuate sections, which have relatively thin walls. The short parts 7 , 8 , 9 , 10 , 11 extend in the longitudinal direction or close to the longitudinal direction of the outer tube 1 . With their reduced wall thickness, the short sections 7 , 8 , 9 , 10 , 11 have a reduced bending stiffness and thus form plastically de...

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PUM

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Abstract

A tubular system arranged in a wellbore, comprising an outer tube extending into the wellbore and having a wall with at least one section of reduced bending stiffness, each section of reduced bending stiffness defining a hinge allowing the outer tube to move between a collapsed mode in which the outer tube has a relatively small cross-sectional size and an expanded mode in which the outer tube has a relatively large cross-sectional size. An inner tube extends into the outer tube and has a wall with at least one section of reduced bending stiffness, each section of reduced bending stiffness defining a hinge allowing the inner tube to move between a collapsed mode in which the inner tube has a relatively small cross-sectional size and an expanded mode in which the inner tube has a relatively large cross-sectional size. With the tubes in their respective expanded modes, the inner tube supports the outer tube and is oriented in the outer tube such that each hinge of the inner tube is circumferentially displaced from each hinge of the outer tube.

Description

technical field [0001] The present invention relates to a tubular system disposed in a wellbore comprising a tubular member extending into the wellbore and having a wall having at least one section of reduced bending stiffness, each section of reduced bending stiffness A hinge is defined that allows the tubular member to move between a collapsed condition having a relatively small cross-sectional dimension and an expanded condition where the tubular member has a relatively large cross-sectional dimension. Background technique [0002] WO99 / 55999 discloses such a system in which the tubulars form a wellbore casing which stabilizes the wellbore wall and prevents the wellbore from collapsing. [0003] A disadvantage of the known system is that, in the expanded state, the resistance to collapse of the pipe is lower than that of conventional pipes without hinges. Contents of the invention [0004] The object of the present invention is to provide an improved tubular system whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/10E21B29/00E21B33/14F16L9/00F16L9/133F16L11/12
CPCE21B29/00E21B43/103
Inventor 威廉默斯·C·M·洛贝克
Owner SHELL INT RES MAATSCHAPPIJ BV