Tubular column lowering power tractor with well grinding and repairing function

[0013] Refer to attached figure 2 , Embodiment 1 of the lower pipe string dynamic tractor with the function of grinding and repairing the wellbore of the present invention, the crown 8 of the tractor is a wedge-shaped cylinder with a wedge-shaped surface of 30°, and has a strong ability to cross the shoulder obstacle; traction The crown 8 is provided with 1~3 dorsal water holes 9 of 30°~45° on the back side of the slope, an axial water hole 11 is opened in the axial direction on the slope side, and a circumferential water hole 10 is opened in the circumferential direction. , to discharge the mud.

[0014] Refer to attached Figure 4 , Embodiment 2 of the power tractor for the downpipe string with the function of grinding and repairing the wellbore of the present invention, the crown 8 of the tractor is a wedge-shaped cylinder with an arc-shaped wedge surface; the crown 8 of the tractor has a 1 ~3 30°~45° dorsal water holes 9, one axial water eye 11 is opened in the axial direction on the slope side, and one circumferential water eye 10 is opened in the circumferential direction to discharge mud.

[0015] This tool is connected to the lower end of the casing string. When it is lowered into the casing, the motor rotor 3 starts to rotate under the drive of the liquid in the casing string. The transmission shaft 4 is connected to the motor rotor 3 and the upper end of the deflector 5. The plane planetary motion of the deflector 5 is converted into fixed axis rotation, and the lower end of the deflector 5 is connected to the tractor crown 8, thereby driving the tractor crown 8 t