Signal operated isolation valve

A method of drilling a wellbore, comprising:

• drilling the wellbore through a formation by injecting drilling fluid through a drill string and rotating a drill bit;
• retrieving the drill string from the wellbore through a casing string until the drill bit is above a closure member, wherein the casing string comprises the closure member in an open position and an actuator;
• sending a wireless instruction signal to the actuator;
• closing the closure member, thereby isolating the formation from an upper portion of the wellbore.

An actuator for use in a wellbore, comprising:

• a tubular housing having a bore formed therethrough;
• a power source;
• a receiver for receiving a wireless instruction signal;
• a controller in communication with the power source and antenna;
• a pump or piston operable to supply pressurized hydraulic fluid to an isolation valve;
• a position or proximity sensor in communication with the controller for determining a position of the isolation valve;
• and
• a lock operably connected to the pump or piston and the controller,
• wherein the controller is operable to release the lock in response to receiving the instruction signal.

A shifting tool for use in a wellbore, comprising:

• a tubular housing having a bore formed therethrough and a pocket formed in a wall thereof;
• a driver moveable relative to the housing between an extended position and a retracted position and disposed in the pocket in the retracted position;
• a piston disposed in the housing, longitudinally movable relative thereto between an engaged position and a disengaged position, and operable to extend the driver when moving from the disengaged position to the engaged position;
• a lock operable to retain the piston in the engaged position;
• and
• an actuator operable to release the lock in response to receiving an instruction signal.