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Downhole apparatus and associated methods

A technology of centralizers and components, which is applied in drilling equipment, earthwork drilling, drilling pipes, etc., and can solve the problems that centralizers cannot be restored

Pending Publication Date: 2020-04-10
VULCAN COMPLETION PROD UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the centralizer cannot return to its original diameter after passing through said size restriction

Method used

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  • Downhole apparatus and associated methods
  • Downhole apparatus and associated methods
  • Downhole apparatus and associated methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0114] figure 1 Shown is casing 10 supported by centralizers 12 within a section of horizontal borehole 14 . An (asymmetrical) annular gap 16 is formed between the outer side of the casing 10 and the hole wall 15 of the borehole 14 . Consolidable materials such as cement are injected between the hole wall 15 and the casing 10 . In this embodiment, the centralizer 12 includes eight circumferentially spaced members 18 extending between two axially spaced end rings 20 mounted on the bushing 10 . Due to the heavy weight of the casing 10 on the centralizer 12, the centralizer 12 is sometimes deformed or collapsed, so that the casing 10 tends to drop to a non-coaxial bottom position within the borehole 14 . Such as figure 1 As shown, one of the members 18 located at the bottom of the borehole 14 has deflected, radially compressed or deformed such that the spring force of the member 18 cannot hold the sleeve 10 centrally or coaxially in the borehole 14. Location. In this case, t...

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PUM

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Abstract

A centraliser (112) includes a number of members (118) extending between two collars (120) for mounting the centraliser (112) on a casing (110). The members (118) are configured to contact a wall (115) of the bore (114) and centraliser the casing (110) in the bore (114).The members (118) are radially moveable between the casing (110) and the bore wall (115). The members (118) further include an intermediate portion (119) and end portions (221), the end portions (221) being relatively more flexible than the intermediate portion (119).

Description

technical field [0001] The present invention relates to centralizers, such as casing centralizers. Background technique [0002] Boreholes that lead into subterranean formations, such as hydrocarbon-bearing formations, are often lined with metal pipe, sometimes called casing or liner. The drilling liner can be lowered into the borehole, and an annular gap is left between the hole wall and the outer surface of the casing, and cement and other cementable materials can be poured into the annular gap to realize the gap between the casing and the hole wall. of the seal. Generally, it is desirable that such cement envelopes formed around casings be of uniform thickness, and this requires the casing to be centrally located in the borehole during cementing. This can be achieved by installing centralizers on the casing, eg at least one centralizer at each casing joint. Centralizers come in many forms and can be either solid or flexible. Centralizers of the "bow spring" type, for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
CPCE21B17/1028E21B17/1078
Inventor 伊恩·柯克内森·柯克
Owner VULCAN COMPLETION PROD UK LTD