Pressure-balanced well service valve

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

E - Fixed Constructions

21

B

166/44

E21B 43/12 (2006.01) E21B 34/06 (2006.01) E21B 43/25 (2006.01)

Patent

CA 1037864

PRESSURE-BALANCED WELL SERVICE VALVE Abstract of the Invention. 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 increas- ing the reliability and useful life of the valve. 1a

245814

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