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Casing profiling and recovery system

a casing and recovery system technology, applied in the direction of fluid removal, explosive charges, wellbore/well accessories, etc., can solve the problems of various sized debris falling into or remaining in the wellbore, difficult sealing of irregularly shaped openings, and difficult to eliminate debris. , to achieve the effect of decreasing the amount of debris and increasing the possibility

Inactive Publication Date: 2008-10-02
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The downhole tools for cutting and recovering a section or segment of wellbore casing and methods for forming an opening in casing in a well have the advantages of: permitting cutting the casing segment and removing the segment of wellbore casing from the wellbore in a single downhole trip; permitting cutting a segment of wellbore casing with relatively smooth edges, thereby increasing the possibility that the window can be re-sealed; and decreasing the amount of debris within the wellbore as a result of cutting the window.

Problems solved by technology

Cutting the windows using these milling tools usually results in jagged edged and irregularly shaped openings.
As a result, if it is desired to close the window, sealing the irregularly shaped opening is extremely difficult, if not impossible.
Additionally, cutting the windows using these prior milling tools resulted in various sized debris falling into or remain in the wellbore after being cut by the milling tools.

Method used

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  • Casing profiling and recovery system
  • Casing profiling and recovery system
  • Casing profiling and recovery system

Examples

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Embodiment Construction

[0029]Referring now to FIGS. 1-12, casing cutting and recovery tool 10, or tool 10 or downhlole tool 10, comprises upper end 12, lower end 14 and housing 16. Upper end 12 and lower end 14 both include threads 18 for securing tool 10 to a casing, drill pipe, tubing string, or wireline (not shown) or other downhole tools (not shown). Housing 16 includes housing bore 20 longitudinally disposed at least partially through housing 16 and outer wall surface 22.

[0030]Tool 10 includes at least one cutting assembly 21. In the embodiment shown in FIG. 1, Cutting assembly 21 includes linear charges 24, 26, 28, 30, 32, 34 disposed along a radial arc of outer wall surface 22. Linear charges are known in the art and may be obtained from Accurate Arms Company, Inc. located in McEwen, Tenn. Briefly, linear charges 24, 26, 28, 30, 32, 34 are shaped explosive devices having a substantially V or U cross-section. When detonated, the explosive force is expelled out of an opening along the top of the V or...

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PUM

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Abstract

A casing cutting and recovery tool having a cutting assembly, an expansion assembly having one or more deforming members, and a recovery assembly is used to cut a window in wellbore casing, secure a removable segment of wellbore casing that was previously disposed within the window, and recover the removable segment of wellbore casing with the tool. One or more cutting assemblies provides one or more cuts in the wellbore casing. The deforming members of the expansion assembly then expand outwardly at least two portions of the wellbore casing shaped by the cut or cuts. The recovery assembly secures the removable segment of the wellbore casing to the tool so that the tool and the removable segment of wellbore casing can be recovered together from the wellbore.

Description

BACKGROUND[0001]1. Field of Invention[0002]The invention is directed to a casing profiling, or cutting, and recovery systems for use in oil and gas wellbores and, in particular, to a downhole tool for cutting a section of wellbore casing and recovering the section from the wellbore.[0003]2. Description of Art[0004]In general, cutting “windows” or openings in oil and gas wellbore casing so that “offshoot,”“lateral,” or “branch” wellbores are well known in the art. Previously, the windows were cut using a whipstock or whipstock-packer assembly and a cutting or milling tool disposed on the end of a drill string. Cutting the windows using these milling tools usually results in jagged edged and irregularly shaped openings. As a result, if it is desired to close the window, sealing the irregularly shaped opening is extremely difficult, if not impossible.[0005]Additionally, cutting the windows using these prior milling tools resulted in various sized debris falling into or remain in the we...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B29/00
CPCE21B29/02E21B29/06E21B31/06E21B31/16
Inventor LYNDE, GERALD D.
Owner BAKER HUGHES INC
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