Auxiliary well pressure packoff assembly

Details Auxiliary well pressure packoff assembly Auxiliary well pressure packoff assembly

1986-03-31

1988-01-12

Leppink, James A.

Wells

Above ground apparatus

Releasable seal or cleaner disengaged by projection on inner...

166 84, 166 93, 277 73, 277103, 277112, E21B 3302

Patent

active

047184876

ABSTRACT:
An auxiliary well pressure packoff assembly for wireline control valves is positionable within the downstream passage of a wireline valve body without requiring cutting of the wireline and receives the wireline in surrounded, sealed relation. A retainer closure positively retains the packing assembly within the valve body passage. An externally controllable mechanism is provided to displace resilient sealing material of the packing assembly to enhance the sealing relationship thereof with the wireline and valve body passage, thus providing an auxiliary seal to protect workers from hazards in the event well pressure should leak past the wireline control valve mechanism. The packoff assembly also clamps the cable to prevent it from moving and vents any leaked well pressure to a safe location. An automatic pressure activated self-energizing feature is provided which increases sealing capability of the system in proportion to increase in well pressure.

REFERENCES:
patent: 1623403 (1927-04-01), Friel
patent: 2684118 (1954-07-01), Osmun
patent: 2689611 (1954-09-01), Martinson
patent: 2943682 (1960-07-01), Ingram, Jr. et al.
patent: 3228703 (1966-01-01), Wilson
patent: 3653671 (1972-04-01), Shipes
patent: 4327804 (1982-05-01), Reed
patent: 4489916 (1984-12-01), Stevens

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