| 摘要 |
A disconnect device for use as part of a tubing string downhole in an oil or gas well and which comprises a tubular body (2), at least one slip (8) held within the tubular body (2), and a sleeve (10) housed within the tubular body (2) to hold the at least one slip (8) in coupling engagement with at least one of a coupling component of an upper sub (1) and a coupling component of a lower sub (3), in use, the sleeve (10) being selectively moveable relative to the at least one slip (8) to release the slip and thereby release the coupling, wherein the slip (8) cooperatively engages with at least one of the coupling component of the upper sub (1) and the coupling component of the lower sub (3) by means of at least one localised protrusion (18) on the slip (8) or on the coupling component extending into a correspondingly shaped local depression or hole (19) in the other of the at least one slip and the coupling component whereby tensile load and torque may be transmitted by the coupling, that part of the device which is to be released and left downhole by releasing the coupling engagement having a fishneck configuration to enable subsequent retrieval by a fishing tool.
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