· Drill pipe
For the manufacture of finished drill pipe drilling tools, the main functions: one is to transfer torque; Second, the upper drilling tool bears part of the weight of the drill string itself, and the lower drilling tool causes the pressure of crushing the rock at the bottom of the hole to the drill bit. The third is to transport well washing fluid, that is, drilling mud slurry through the high pressure mud pump on the ground, into the tap into the drill string hole into the bottom hole to wash the cuttings, cool the drill bit and carry the cuttings through the outer surface of the drill string and the ring space between the wall of the hole to return to the surface, so that the bottom of the hole is deepened until the target layer is drilled.
