Patent ID: 8397824
Filing Date: 2013-03-19
Classification: E21B

Abstract:
1. A hydraulic control system for actuating a downhole tool, the hydraulic control system comprising: a plurality of valve members operable to selectively allow and prevent fluid communication between high and low pressure sources and first and second sides of a piston disposed in an actuator operably associated with the downhole tool; and a drive assembly including a ring gear and at least one motor operably associated with the valve members to operate the valve members between open and closed positions; wherein, a first pair of valve members is ported to the high pressure source; wherein, a second pair of valve members is ported to the low pressure source; wherein, a third pair of valve members is ported to the first side of the piston; wherein, a fourth pair of valve members is ported to the second side of the piston; and wherein, operation of the valve members by the drive assembly to a first configuration shifts the piston in a first direction and operation of the valve members by the drive assembly to a second configuration shifts the piston in a second direction.