Pressure-balanced well service valve

Details Pressure-balanced well service valve Pressure-balanced well service valve

1975-03-06

1976-10-26

Leppink, James A.

Wells

Screens

Porous material

13750518, E21B 4312

Patent

active

039878481

ABSTRACT:
A well service valve used primarily for the injection of closely controlled batches of well treating fluids into low pressure formations utilizes a biased one-way flow valve in a tubing string to hold the treating fluid in the column until the tubing is pressurized to open the valve and expose flow ports in the wall of the tubing to the formation. A partial pressure-balancing of the flow valve allows the use of a lower biasing force in the flow valve, thereby greatly increasing the reliability and useful life of the valve.

REFERENCES:
patent: 2033563 (1936-03-01), Wells
patent: 2757741 (1956-08-01), O'Reilly
patent: 3032111 (1962-05-01), Corley et al.
patent: 3319717 (1967-05-01), Chenoweth
patent: 3796261 (1974-03-01), Nutter

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