Patent ID: 7360602
Filing Date: 2008-04-22
Classification: E21B,Y10T

Abstract:
1. A gas lift valve assembly for selectively controlled flow of fluid from an annulus of a wellbore into a flowbore of production tubing within the wellbore comprising: a valve body having a fluid flow path with a fluid inlet and a fluid outlet; the fluid inlet being in fluid communication with the annulus; the fluid outlet being in fluid communication with the flowbore; and a flapper valve member retained within the valve body and moveable in response to pressure changes in the annulus between a closed position wherein fluid flow is blocked through the fluid flow path and an open position wherein fluid flow is permitted through the fluid flow path; and a gas lift valve disposed within the fluid flow path between the flapper valve member and the annulus so that the flapper valve member will block backflow of fluid to the gas lift valve.