Downhole pressure relief valve for well pump

Details Downhole pressure relief valve for well pump Downhole pressure relief valve for well pump

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 47/00 (2006.01) E21B 34/08 (2006.01) E21B 43/12 (2006.01) F04B 53/10 (2006.01)

Patent

CA 2227856

A well pump assembly has a pressure relief valve in the tubing string for avoiding excessive discharge pressure on a progressing cavity pump. The pressure relief valve is mounted in the string of tubing downstream of the pump. The valve assembly has a main flow passage through it for fluid being pumped by the pump through the tubing. The valve assembly has a valve seat and a spring-biased valve element which is urged by the spring against the downstream end of the valve seat to maintain the valve seat closed. The upstream end of the valve seat is in communication with the pressure in the tubing. If the tubing pressure exceeds a selected level, the valve element moves to an open position, discharging well fluid into the casing.

Une pompe de puits est protégée par une soupape de décharge placée dans la colonne de tubage pour éviter toute surpression de décharge sur une pompe à cavité progressive. La soupape de décharge est montée dans la colonne de tubage, en aval de la pompe. La soupape est traversée par un passage principal qui permet à la pompe de pomper le fluide à travers le tubage. La soupape comporte un siège et un obturateur à ressort qui est poussé par le ressort contre l'extrémité aval du siège pour maintenir la soupape fermée. L'extrémité amont du siège de soupape communique avec la pression dans le tubage. Si la pression dans le tubage dépasse un niveau prédéterminé, l'obturateur s'ouvre et décharge le fluide du puits dans le tubage.

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