Patent ID: 7152674

Claim:
A disconnect device for use as part of a tubing string downhole in an oil or gas well and which comprises: a tubular body, at least one slip held within the tubular body, and a sleeve housed within the tubular body to hold the at least one slip in coupling engagement with a coupling component of an upper sub and a coupling component of a lower sub, in use, the sleeve being selectively moveable relative to the at least one slip to release the at least one slip and thereby release the coupling, wherein the at least one slip includes at least one localized protrusion disposed on an inner diameter of the at least one slip which cooperatively engages with a corresponding localized depression or hole disposed on an outer diameter of at least one of the coupling component of the upper sub and the coupling component of the lower sub whereby tensile load and torque is 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.