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 threaded inner surface of the tubular mandrel and radially movable between an engaged position and a disengaged position, wherein: in the engaged position, each dog abuts against the wall of the tubular housing surrounding the respective opening and each thread portion engages the threaded inner surface of the tubular mandrel, thereby longitudinally and rotationally coupling the tubular housing and the tubular mandrel; a piston 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: in the locked position, the piston engages the dogs with the threaded inner surface of the mandrel, and the tubular mandrel, the tubular housing, and the piston define a flow bore through the disconnect tool; a first spring biasing the piston toward the locked position; second springs, each second spring biasing the respective dog toward the disengaged position; and an actuator comprising: a solenoid valve or an electric pump; and an electronics package comprising a battery, a receiver operable to receive an instruction signal and a microprocessor operable to facilitate disengagement of the piston from the dogs in response to receipt of the instruction signal by supplying electricity from the battery to the solenoid valve or electric pump. 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 threaded inner surface of the tubular mandrel and radially movable between an engaged position and a disengaged position, wherein: in the engaged position, each dog abuts against the wall of the tubular housing surrounding the respective opening and each thread portion engages the threaded inner surface of the tubular mandrel, thereby longitudinally and rotationally coupling the tubular housing and the tubular mandrel; a piston 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: in the locked position, the piston engages the dogs with the threaded inner surface of the mandrel, and the tubular mandrel, the tubular housing, and the piston define a flow bore through the disconnect tool; a first spring biasing the piston toward the locked position; second springs, each second spring biasing the respective dog toward the disengaged position; and an actuator comprising: a solenoid valve or an electric pump; and an electronics package comprising a battery, a receiver operable to receive an instruction signal and a microprocessor operable to facilitate disengagement of the piston from the dogs in response to receipt of the instruction signal by supplying electricity from the battery to the solenoid valve or electric pump. in the engaged position, each dog abuts against the wall of the tubular housing surrounding the respective opening and each thread portion engages the threaded inner surface of the tubular mandrel, thereby longitudinally and rotationally coupling the tubular housing and the tubular mandrel; a piston 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: in the locked position, the piston engages the dogs with the threaded inner surface of the mandrel, and the tubular mandrel, the tubular housing, and the piston define a flow bore through the disconnect tool; a first spring biasing the piston toward the locked position; second springs, each second spring biasing the respective dog toward the disengaged position; and an actuator comprising: a solenoid valve or an electric pump; and an electronics package comprising a battery, a receiver operable to receive an instruction signal and a microprocessor operable to facilitate disengagement of the piston from the dogs in response to receipt of the instruction signal by supplying electricity from the battery to the solenoid valve or electric pump. in the locked position, the piston engages the dogs with the threaded inner surface of the mandrel, and the tubular mandrel, the tubular housing, and the piston define a flow bore through the disconnect tool; a first spring biasing the piston toward the locked position; second springs, each second spring biasing the respective dog toward the disengaged position; and an actuator comprising: a solenoid valve or an electric pump; and an electronics package comprising a battery, a receiver operable to receive an instruction signal and a microprocessor operable to facilitate disengagement of the piston from the dogs in response to receipt of the instruction signal by supplying electricity from the battery to the solenoid valve or electric pump.