E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
294/11, 166/51.1
E21B 31/12 (2006.01) E21B 17/06 (2006.01) E21B 23/04 (2006.01) E21B 23/14 (2006.01)
Patent
CA 2006200
WIRELINE RELEASING DEVICE AND METHOD OF RELEASING WIRELINE ABSTRACT OF THE DISCLOSURE An apparatus and method for selectively discon- necting a wireline from a downhole tool when the tool be- comes lodged in an oil or gas well. The apparatus is direct- ed to a wireline releasing device which includes a precharge chamber which can be pressurized to a predetermined amount for applying a force against a piston assembly located within the releasing device to hold together telescopically connect- ed upper and lower tubular portions which are locked in place by retractable dogs which extend through aligned openings in the upper and lower tubular portions. The device is intended to be connected at one end to a length of wireline and, to another end, to the top of the downhole tool. During wireline operations, upon the downhole tool becoming lodged within the well, the wireline operator applies hydraulic or pneumatic pressure from the surface which exceeds the precharged pressure, which acts to discon- nect the upper portion of the device from the lower portion and the downhole tool.
Conoco Inc.
Petree Allen R.
Sim & Mcburney
LandOfFree
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