Torque release coupling for use in drill strings
AssigneeDen Norske Stats Oljesselskap A.S.
InventorsEgil Sunde, Morten Hyvik, Per Olav Haughom
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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 spring 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 spring part.
Claims10
Torque release coupling for use in drill strings comprising a radially outer string part (1) rotatably mounted outside a radially inner string part (2), and a between them positioned rotation lock (3), characterized in that the rotation lock is fastened to a first of said string parts (1,2) with a coupling device (4,9) adapted to allow axial movements relative to the first string part, and that the rotation lock comprises axially oriented gripping organs (5) adapted to releasable engagement into corresponding gripping organs in the second string part, the rotation lock also comprising a spring (6) or similar adapted to provide an axial force on the rotation lock oriented from the first string part toward the corresponding gripping organs (5),
- and that the torque release coupling has an annular main shape to allow through flow of fluids and being in its upper and lower parts (11,12) provided with coupling means for connecting to per se known parts of a drill string.
Torque release coupling according to any one of the preceding claims,
- characterized in that the rotation lock (3) is coupled to the radially outer string part (1), and that it engages into the radially inner part through the gripping organs (5)
Torque release coupling according to any one of the preceding claims,
- characterized in that the spring (6) is a hydraulic device.
Torque release coupling according to any one of the preceding claims,
- characterized in that it comprises means (7) for tightening the spring thus to provide a possibility for adjusting the torque release coupling.
Torque release coupling according to any one of the preceding claims,
- characterized in that the rom defined by the string parts (1,2) is filled with oil.
Dependencies are inferred from the claim text.