Patent ID: 8602111

Claim:
A system for controlling flow of fluid in a wellbore, comprising: a flow control device positioned in the wellbore, said flow control device having a piston operably coupled to a movable element controlling a fluid flow in the wellbore, the movable element being incrementally displaced between a start position and a stop position by a plurality of pressure pulses applied to the piston; a fluid line hydraulically coupled to the flow control device; a pump configured to supply hydraulic fluid at a base pressure to the flow control device; a first line connected at the surface to the pump, wherein the first line conveys the hydraulic fluid from the pump to the fluid line; a surface hydraulic source configured to transmit the applied pressure pulses to the flow control device, the hydraulic source being configured to alter a pressure and duration of the applied pressure pulses; and a second line connected at the surface to the surface hydraulic source, wherein the second line conveys the applied pressure pulses from the surface hydraulic source to the fluid line.