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US 2021/0340848 A1Published application
Gas lift valve with dual fortress seal
OwnerZlatko Salihbegovicinventor
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OwnerZlatko Salihbegovicinventor
Estimating the term…
A GLV-gas lift valve that uses dual “fortress™” seals on both sides of the bellow 19 to protect said bellow from both high dome pressure 3 acting against outside bellow surface and high injection pressure acting against bellow 19 internal surface. When valve is in closed position, after dome pressure 3 is applied, upper-dome side “fortress™” seal is engaged and prevents high dome pressure reaching said bellow 19 external surface. When valve is in fully open position, when injection pressure 14 is applied, lower seal 10 is engaged and prevents access of high injection pressure into bellow acting against bellow internal surface. This principle allows much higher pressures to be applied in valve dome section and injection section by reducing differential pressure across the bellow 19. In addition, lower “fortress™” seal allows very high injection pressure 14 more than 10 KSI to be applied without damage to bellow or gas lift valve components.
A gas lift valve for use in onshore and offshore oil wells for oil artificial lifting to the surface comprising of major parts as an external structure with longitudinal axis with dome 1, bellow housing 2 with upper packing stack-seal 20, inlet pressure 14 sub, internal port 13, lower packing-seal stack 16 body, nose 17 and internal moveable valve structure comprising of bellow 19 spring loaded telescoping stem 11 with TC-Tungsten carbide ball 12, and reverse flow check valve 15. Valve further comprises of upper-dome 1 side “fortress™” seal 5 and lower “fortress™” seal 10 wherein dome pressure 3 acts against bellow 19 external surface and injection pressure 14 acts against bellow 19 internal surface.