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Casing rotary steerable system for drilling

a rotary steerable, drilling technology, applied in the direction of directional drilling, earth drilling and mining, drilling machines and methods, etc., can solve the problems of difficulty in combining mechanical systems that accomplish each

Inactive Publication Date: 2012-08-09
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a system for drilling a deviated borehole. It includes a drill string, a bending mechanism, a drill bit, and a liner. The bending mechanism is placed inside the liner and is in contact with the liner at multiple locations. The liner is attached to the bit and rotates with it. The system can be used for either casing or liner drilling. The technical effect of this invention is to provide a flexible and efficient tool for drilling deviated boreholes.

Problems solved by technology

When it is desired to combine the concepts of directional drilling and casing drilling, various aspects of the operation make it difficult to combine the mechanical systems that accomplish each, as mentioned in U.S. Pat. No. 7,086,485.

Method used

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  • Casing rotary steerable system for drilling
  • Casing rotary steerable system for drilling

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Embodiment Construction

[0013]Referring to the Figure, a casing drilling system 10 in accordance with a preferred embodiment extends from the surface (not shown) into a borehole 12 in a formation 14. A portion of borehole 14 above casing drilling system 10 may be cased with a previously-placed casing string 16. Casing drilling system 10 includes a drill string 18, a liner string 20, a mandrel 22, upper and lower latches 30, 32, respectively, an eccentric bearing 34, and a bit 24. In other embodiments, bit 24 may be supported on a mandrel (not shown).

[0014]In the embodiment shown, during drilling, torque is applied to drill string 18 at the surface, transmitted from drill string 18 to liner string 20 at the top of liner 20, and from liner 20 to bit 24. In some instances, a liner hanger running tool 25 may be included between the liner and the drill string, so that torque is applied to the bit via a path that includes drill string 18, liner hanger running tool 25, and liner 20, as indicated by arrows 27, 28,...

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PUM

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Abstract

A system for drilling a deviated borehole, comprises a drill string, a bending mechanism supported on the drill string, a drill bit supported on the bending mechanism such that the axis of the bit does not align with the axis of the drill string where it connects to the bending mechanism, and a liner supported on at least one of the bit and the drill string and having upper and lower ends, wherein the bending mechanism is disposed within the liner such that the upper and lower liner ends are not co-axial.

Description

RELATED CASES[0001]Not applicable.FIELD OF THE INVENTION[0002]The invention relates to a casing-drilling system with directional capabilities. More particularly, the present invention relates to a system in which a bending mechanism supports the drill bit and extends through a casing or liner such that the casing or liner is bent by the bending mechanism.BACKGROUND OF THE INVENTION[0003]In oil and gas drilling operations it is often desirable to change direction in the course of drilling. Generally, the goal is to change the direction in which the drill bit at the lower end of a drill string drills, so that it does not drill along the central longitudinal axis of the lower part of the drill string. Many drilling systems and methods have been developed for this purpose. These include “point-the-bit” systems, in which the axis of rotation of the drill bit is deviated from the axis of the bottom hole assembly (BHA), such as by including a bend in the BHA itself, and “push-the-bit” syst...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B7/04
CPCE21B7/20E21B7/067
Inventor HENLEY, JOHN ANDREWSTEIGINGA, ABE
Owner SHELL OIL CO