DUAL LINE HYDRAULIC CONTROL SYSTEM TO OPERATE MULTIPLE DOWNHOLE VALVES

摘要

A method and apparatus for controlling a control valve. A primary line is pressurized according to an operating sequence to move a piston within a housing such that one of an open line port and a close line port is in fluid communication with a selected chamber of a first control chamber and a second control chamber of a plurality of chambers defined between the piston and the housing. A secondary line is pressurized to move hydraulic fluid through the selected chamber and through the one of the open line port and the close line port in fluid communication with the selected chamber to thereby control a state of a control valve. The primary line and the secondary line are pressurized simultaneously according to the operating sequence. The primary line is vented, while the secondary line remains pressurized, to reset a position of the piston within the housing.