Resistance-reduction and torque-reduction tool for large-displacement well

The utility model relates to a matched drilling tool for a large-displacement well, in particular to a resistance-reduction and torque-reduction tool for the large-displacement well. A center shaft (1) of the tool is connected with an inner sleeve (2) through screw threads, the inner sleeve (2) is connected with an outer sleeve (3) through screw threads, a bearing (5) is arranged between the center shaft (1) and the outer sleeve (3), a pin shaft (6) is fixed in a hole formed on the surface of the outer sleeve (3), baffle plates (8) and rollers (7) are arranged at both sides of wheels (4), and the wheels (4), the rollers (7) and the baffle plates (8) are all sheathed on the pin shaft (6). Through the resistance-reduction and torque-reduction tool, the resistance reduction and the torque reduction is realized during drilling post lifting and dropping on the large-displacement well, simultaneously, the abrasion of a sleeve pipe and a drilling post is reduced, and defects of large resistance during drilling post