Patent · US Expired

Torque release coupling for use in drill strings

US6834889B2 · kind B2 · utility

10Cited by

13References

11Claims

0Family size

Assignee

Den Norske Stats Oljeselskap A.S. · NO

Inventors

Egil Sunde · Sandnes, NO
Morten Hyvik · Stavanger, NO
Per Olav Haughom · Tonstad, NO

Key dates

Filing date	Sep 27, 2002
Grant date	Dec 28, 2004
Priority date	—
Expiry date	Dec 20, 2022

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/06
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

This invention relates to a torque release coupling for use in drill strings comprising an outer string part (1) rotatably mounted outside a radially inner string part (2), and a rotation lock (3) positioned between them. The rotation lock (3) is coupled to a first of said string parts (1, 2) with a coupling device (4, 9) adapted to allow axial shifts relative to the first string part, and comprising axial gripping organs (5) adapted for releasable engagement with cooperating gripping organs in the second string part, the rotation lock (3) comprising a spring (6) or similar adapted to apply an axial force on the rotation lock (3) directed against the cooperating gripping organs (5) from the first string part.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.