Wells – Processes – Disassembling well part
Patent
1990-01-11
1991-03-05
Dang, Hoang C.
Wells
Processes
Disassembling well part
166378, 166385, E21B 2300
Patent
active
049970410
ABSTRACT:
An apparatus and method for selectively disconnecting a wireline from a downhole tool when the tool becomes lodged in an oil or gas well. The apparatus is directed 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 connected 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 disconnect the upper portion of the device from the lower portion and the downhole tool.
REFERENCES:
patent: 2266382 (1941-12-01), Quintrell et al.
patent: 4275786 (1981-06-01), Lee
patent: 4333542 (1982-06-01), Taylor
patent: 4422508 (1983-12-01), Rutledge, Jr. et al.
patent: 4685516 (1987-08-01), Smith et al.
patent: 4877089 (1989-10-01), Burns
Conoco Inc.
Dang Hoang C.
Holder John E.
Thomson Richard K.
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