TRICONE ROCK BIT FOR HORIZONTAL WELLS AND HARD FORMATION WELLS

摘要

A tricone rock bit for horizontal wells and hard formation wells, comprising three cone legs (3) and cones (4) arranged at the lower end of the cone legs, wherein the tops of the three cone legs (3) combine together to form one integrated drill bit body; jet nozzle seats (8) are arranged between the cone legs on the drill bit body; jet nozzles (7) are arranged in nozzle holes of the jet nozzle seats (8); gauge teeth are arranged on the top rear of the back of the cone legs, forming a gauge face on the top of the cone legs; and the front face (2) of the cone legs is a straight face, inclining backwards at an angle alpha, and inclining towards the exterior at an angle beta. The present tricone rock bit has low lateral vibration, the stability of the drill bit is high, the shaft-bottom cleaning and cone tooth cooling effects are good, and the bit has a relatively long service life and high mechanical drilling speed.