Patent ID: 7640990

Claim:
A method for injecting fluid into an earth formation through a completion string having one or more flow control valves disposed thereon, comprising: providing a completion string having one or more flow control valves positioned eccentric to the completion string; each flow control valve comprising: a chamber having an entry port and an exit port; a moveable choke positioned in the chamber proximate to the exit port; and configured to operate independently of a check valve assembly positioned in the chamber; wherein the check valve assembly comprises: a ball seat having an opening; a ball configured to sealably couple wit the ball seat; and a spring coupled to the ball, wherein the spring biases the ball towards a position in which the opening is sealed; deploying the completion string inside a wellbore such that the one or more flow control valves are positioned proximate one or more earth formations; coupling a high pressure pump with the completion string; pumping fluid under high pressure, via the high pressure pump, from the surface into the completion string; discharging the high-pressure fluid into the wellbore through the exit port; and blocking return flow through the exit port of the flow control valve upon cessation of pumping.