| 摘要 |
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.
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