Friction-reducing and resistance-reducing hydraulic clutch drilling tool and method for horizontal well

The invention discloses a friction-reducing and resistance-reducing hydraulic clutch drilling tool and method for a horizontal well. The friction-reducing and resistance-reducing hydraulic clutch drilling tool comprises an upper connector, a connecting assembly A, a coupler A, a screw rotor, a screw stator with a screw-shaped cavity, a connecting assembly B, a coupler B, a middle connector, a push rod with a small-diameter flow channel, an internal spline shell, a mandrel with a mandrel flow channel, a connecting assembly C and a lower connector. The upper end and the lower end of the screw stator are connected with the lower end of the upper connector and the upper end of the middle connector through the connecting assembly A and the connecting assembly B. The screw rotor is installed in a screw-shaped cavity of the screw stator, and the upper end and the lower end of the screw rotor are connected with the inner wall of the upper connector and the inner wall of the middle connector through the coupler A and