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A mud motor for use in a wellbore includes: a stator; a rotor, the stator and rotor operable to rotate the rotor in response to fluid pumped between the rotor and the stator; and a lock. The lock is operable to: rotationally couple the rotor to the stator in a locked position, receive an instruction

A mud motor for use in a wellbore includes: a stator; a rotor, the stator and rotor operable to rotate the rotor in response to fluid pumped between the rotor and the stator; and a lock. The lock is operable to: rotationally couple the rotor to the stator in a locked position, receive an instruction signal from the surface, release the rotor in an unlocked position, and actuate from the locked position to the unlocked position in response to receiving the instruction signal.

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1. A disconnect tool for use in a string of tubulars, comprising: a tubular mandrel having a threaded inner surface;a tubular housing having a plurality of openings formed radially through a wall thereof;an arcuate dog disposed in each opening, each dog having an inclined inner surface and a portion

1. A disconnect tool for use in a string of tubulars, comprising: a tubular mandrel having a threaded inner surface;a tubular housing having a plurality of openings formed radially through a wall thereof;an arcuate dog disposed in each opening, each dog having an inclined inner surface and a portion of a thread corresponding to the mandrel thread and radially movable between an engaged position and a disengaged position,wherein: abutment of each dog against the housing wall surrounding the respective opening longitudinally and rotationally couples the dogs and the housing in the engaged position, andeach thread portion engages the mandrel thread in the engaged position,thereby transferring torque between the housing and the mandrel;a tubular sleeve longitudinally movable between a locked position and an unlocked position and having an inclined outer surface for engagement with the inclined inner surface of each dog,wherein: the sleeve engages the dogs with the mandrel thread in the locked position, andthe mandrel, housing, and sleeve define a flow bore through the disconnect tool;a first spring biasing the sleeve toward the locked position;second springs, each second spring biasing the respective dog toward the disengaged position; andan actuator comprising: a battery;a receiver operable to receive an instruction signal; anda controller operable to facilitate disengagement of the sleeve from the dogs in response to receipt of the instruction signal. 2. The disconnect tool of claim 1, wherein the sleeve is a piston. 3. The disconnect tool of claim 2, wherein: the actuator is operable to: fluidly lock the piston in the locked position, andfluidly unlock the piston in response to receipt of the instruction signal,the piston has one or more ports in fluid communication with the flow bore of the disconnect tool, andthe piston is operable to move toward the unlocked position in response to fluid pressure exerted through the ports. 4. The disconnect tool of claim 2, wherein the actuator is operable to move the piston to the unlocked position in response to receipt of the instruction signal. 5. The disconnect tool of claim 2, wherein the actuator further comprises: a position sensor or limit switch in communication with the controller and operable to determine a position of the piston. 6. The disconnect tool of claim 2, wherein the receiver has an antenna located adjacent to the flow bore and operable to receive the instruction signal from a radio frequency identification (RFID) tag travelling through the flow bore. 7. The disconnect tool of claim 6, wherein the actuator further comprises a transmitter operable to transmit a signal to the RFID tag. 8. A method of drilling a wellbore, comprising: deploying a drilling assembly in the wellbore, the drilling assembly comprising a drill string, the disconnect tool of claim 1, and a drill bit;injecting drilling fluid through the drilling assembly and rotating the bit, thereby drilling the wellbore;sending the instruction signal from surface, thereby operating the disconnect tool and releasing the drill bit from the drill string. 9. The method of claim 8, further comprising sending a second instruction signal from the surface, thereby operating the disconnect tool and re-connecting the drill bit to the drill string. 10. The method of claim 9, further comprising, after release and before reconnection, raising the drill string to create a gap between the drill bit and the drill string. 11. The method of claim 10, further comprising: deploying a tool through the drill string to the gap;operating the tool in the gap,wherein the tool comprises one or more of: a logging tool, a perforation gun, a formation tester, and a packer. 12. The method of claim 8, wherein the disconnect tool is operated in response to the drilling assembly being stuck in the wellbore. 13. The method of claim 12, wherein: the drilling assembly further comprises a second disconnect tool,the method further comprises determining a freepoint of the stuck drilling assembly, andthe operated disconnect tool is closer to the freepoint than the second disconnect tool. 14. A bottomhole assembly (BHA) for use with a drill string, comprising: the disconnect tool of claim 1; anda data sub, comprising: a tubular housing having a bore formed therethrough;one or more sensors disposed in the housing; anda transmitter disposed in the housing and operable to transmit a measurement from the sensor to surface. 15. The BHA of claim 14, wherein the data sub further comprises: a receiver disposed in the housing and operable to receive an instruction signal from the surface; anda controller disposed in the housing, in communication with the sensors, transmitter, and receiver and operable to operate the transmitter in response to receiving the instruction signal from the surface. 16. The BHA of claim 14, wherein the sensors comprise a pressure sensor in communication with the housing bore and an exterior of the data sub and a temperature sensor. 17. The BHA of claim 14, wherein the sensors comprise a strain gage oriented to measure longitudinal strain of the housing and a torsional strain gage oriented to measure torsional strain of the housing. 18. The BHA of claim 14 wherein the sensors comprise a rotation sensor for measuring rotational velocity of the data sub. 19. A method of drilling a wellbore, comprising: deploying a drilling assembly in the wellbore, the drilling assembly comprising a drill string, a disconnect tool in an engaged and a locked position, and a drill bit,wherein the disconnect tool comprises: a tubular mandrel having a threaded inner surface,a tubular housing having a plurality of openings formed radially through a wall thereof,an arcuate dog disposed in each opening, each dog having an inclined inner surface and a portion of a thread corresponding to the mandrel thread and radially movable between the engaged position and a disengaged position, anda tubular sleeve longitudinally movable between the locked position and an unlocked position and having an inclined outer surface for engagement with the inclined inner surface of each dog;injecting drilling fluid through the drilling assembly and rotating the bit by exerting torque on the bit, thereby drilling the wellbore,wherein: engagement of each thread portion with the mandrel thread longitudinally and rotationally couples the housing and the mandrel, andthe engaged doqs transfer the torque between the housing and the mandrel;operating the disconnect tool, thereby releasing the drill bit and a lower portion of the disconnect tool in the wellbore; andafter release, engaging the dog thread portions with the mandrel thread and rotating the drill string and an upper portion of the disconnect tool relative to the lower portion, thereby reconnecting the drilling assembly in the wellbore. 20. The method of claim 19, wherein: the disconnect tool further comprises an actuator comprising: a battery,a receiver operable to receive an instruction signal, anda controller operable to facilitate disengagement of the sleeve from the dogs in response to receipt of the instruction signal, andthe disconnect tool is operated by sending the instruction signal from surface. 21. The method of claim 19, wherein: the sleeve is a piston, andthe disconnect tool is operated by pumping a ball through the drill string and to a seat of the disconnect tool and pressurizing the drill string. 22. The method of claim 19, further comprising, after release and before reconnection, raising the drill string to create a gap between the drill bit and the drill string. 23. The method of claim 22, further comprising: deploying a tool through the drill string to the gap;operating the tool in the gap,wherein the tool comprises one or more of: a logging tool, a perforation gun, a formation tester, and a packer.