Patent ID: 8978750
Filing Date: 2015-03-17
Classification: E21B

Abstract:
1. 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, wherein the drill string comprises a shifting tool, an antenna in communication with the shifting tool and located adjacent to a bore of the drill string, a microprocessor in communication with the antenna and the shifting tool, and the drill bit; retrieving the drill string from the wellbore through a casing string until the shifting tool reaches an actuator, wherein the casing string comprises an isolation valve in an open position and the actuator; pumping a wireless instruction tag (WIT) down the bore of the drill string to the antenna, thereby sending a wireless instruction signal to the antenna, wherein the microprocessor causes the shifting tool to engage the actuator in response to the antenna receiving the instruction signal; and operating the actuator using the engaged shifting tool, thereby closing the isolation valve and isolating the formation from an upper portion of the wellbore.