Den Norske Stats Oljeselskap A.s.

Morten Hyvik

Per Olav Haughom

Egil Sunde

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

Growing community of inventors

Stavanger, Norway

Morten Hyvik