Well pressure activated pack-off head

Details Well pressure activated pack-off head Well pressure activated pack-off head

2005-10-11

2005-10-11

Tsay, Frank S (Department: 3672)

Wells

Above ground apparatus

With seal for reciprocating member

C166S088100, C277S330000

Reexamination Certificate

active

06953085

ABSTRACT:
The present invention discloses a well pressure activated pack off head comprising a hollow body formed for coaxial connection to the wellhead which provides for unobstructed passage of a data transmitting wireline therethrough. Disposed coaxially within the hollow body is a pack off rubber with a passage formed along its longitudinal axis for passage of a data transmitting wireline. Located below the pack off rubber is a piston in pressure communication with the wellbore. High pressure inside of the wellbore squeezes the piston against the pack off rubber and compresses it tightly around the wireline. A pressure seal is formed between the pack off rubber and the wireline when the pack off rubber is sufficiently compressed by the piston.

REFERENCES:
patent: 3228703 (1966-01-01), Wilson
patent: 3265399 (1966-08-01), Scaramucci
patent: 3606347 (1971-09-01), Read
patent: 4423775 (1984-01-01), Wilson
patent: 6394461 (2002-05-01), Henderson

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