Combination subsurface safety valve and chemical injector valve

Details Combination subsurface safety valve and chemical injector valve Combination subsurface safety valve and chemical injector valve

1976-10-01

1977-08-16

Leppink, James A.

Wells

Processes

Entraining or incorporating treating material in flowing...

166314, 166321, E21B 4300, E21B 4312

Patent

active

040420337

ABSTRACT:
A surface controlled subsurface safety valve for controlling fluid flow through a tubing string in an oil or gas well is combined with an injector valve, which is used for injecting a chemical fluid into the tubing string. The pressure exerted by the chemical fluid is used to operate both the injector valve and the subsurface safety valve. The injector valve is designed to open at an injection pressure equal to or greater than the pressure needed to hold the safety valve in its open position.

REFERENCES:
patent: 2654436 (1953-10-01), Carlisle et al.
patent: 2852080 (1958-09-01), Roach
patent: 2928471 (1960-03-01), Jones
patent: 3104716 (1963-09-01), Burkhardt et al.
patent: 3675720 (1972-07-01), Sizer
patent: 3712862 (1973-01-01), Bundrant et al.

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