Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1982-07-26
1984-04-03
Pate, III, William F.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166 53, 166 82, 166 80, 166 84, E21B 3306
Patent
active
044402325
ABSTRACT:
A method and apparatus of compensating for the closing force on a blowout preventer caused by well pressure for reducing the wear on the blowout preventer sealing element when moving a drill string through a closed blowout preventer. A hydraulic opening force is applied to the blowout preventer which is actuated by and is proportional to the well pressure. A compensating line is connected between the blowout preventer fluid supply line and the blowout preventer opening line. A control valve is provided in the compensating lines for applying an opening force on the blowout preventer and a pilot control pressure regulator is provided in the compensating line for limiting the compensating pressure. The pilot control line is connected between the regulator and the well pressure in the blowout preventer whereby the output pressure is proportional to the well pressure for compensating for the closing force on the blowout preventer caused by the well pressure.
REFERENCES:
patent: 2163813 (1939-06-01), Stone et al.
patent: 3145995 (1964-08-01), Adamson et al.
patent: 3207221 (1965-09-01), Cochran et al.
patent: 3580586 (1971-05-01), Burns
patent: 3583480 (1971-06-01), Regan
Dang Hoang C.
Koomey, Inc.
Pate III William F.
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