Wells – Processes – Freeing stuck object – grappling or fishing in well
Patent
1977-08-25
1978-08-22
Leppink, James A.
Wells
Processes
Freeing stuck object, grappling or fishing in well
166 99, 294 861, E21B 3110
Patent
active
041082451
ABSTRACT:
A tubular sleeve structure defining an upwardly opening socket and including peripherally spaced inwardly retractable and spring biased outwardly projecting stop lugs is provided for positioning above and downward abutting engagement with a stop sleeve secured in the top of an overshot tool to be passed downwardly into a well bore over the supporting cable for a tool stuck in the well bore. An abutment is provided for securement to the cable from which the stuck tool is supported with the abutment positioned on the cable above the rig floor and closely below the portion of the cable to be engaged by upper and lower clamping as additional sections of pipe are added to the string of pipe by which the overshot is being lowered into the well bore over the cable. In the event the upper and lower clamping process of the cable experiences a malfunction and the cable is dropped downwardly through the tubing supporting the overshot, the abutment will abut the tubular sleeve structure supported at the bottom of the pipe string from the overshot tool and seat within the upwardly opening socket defined by the sleeve structure to thereby prevent the abutment and the cable to which the abutment is attached from falling further downwardly through the pipe string.
REFERENCES:
patent: 3011549 (1961-12-01), Fredd et al.
patent: 3016954 (1962-01-01), Crowell
patent: 3147809 (1964-09-01), Thomas
patent: 3358765 (1967-12-01), Le Blanc
Jacobson Harvey B.
Leppink James A.
O#Brien Clarence A.
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