Wireline safety mechanism for wireline tools

Details Wireline safety mechanism for wireline tools Wireline safety mechanism for wireline tools

1988-10-14

1989-12-12

Novosad, Stephen J.

Wells

Above ground apparatus

Moving tubing or cable into an existing well

166217, 166385, E21B 2904, E21B 2302, E21B 3414

Patent

active

048861154

ABSTRACT:
A pressure containing wireline safety mechanism for wireline assemblies incorporates a tubular body for attachment between the lubricators and stuffing box of the wireline assembly. An inner housing is releasably retained within the tubular body and is provided with a wireline cutter to cut the wireline and release a wireline tool string that is stuck in a position blocking closure of the wellhead saftey valves and the wireline blowout preventor. The inner housing also incorporates a valve mechanism that automatically forms a pressure containing seal after the wireline has been cut to thus permit the stuffing box to be removed and another wireline assembly installed above the first wireline assembly for removing the inner housing and releasing the stuck wireline tool string.

REFERENCES:
patent: 2943682 (1960-07-01), Ingram, Jr. et al.
patent: 3435895 (1969-04-01), Lee
patent: 3926252 (1975-12-01), Ribeyre et al.
patent: 4046191 (1977-09-01), Neath
patent: 4237972 (1970-12-01), Lanmon, II
patent: 4299280 (1981-11-01), Greer
patent: 4512411 (1985-04-01), Pringle
patent: 4660635 (1987-04-01), Wittrisch

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