Auger drill collar is prevented Spray metal sucker rod coupling during drilling differential pressure block, the helical groove allows the mud flow freely around the drill collar to prevent the formation of an equilibrium pressure block, thereby effectively preventing differential sticking phenomenon. You can reduce the contact area with the drilling shaft, and thus the possibility of a pressure differential block can effectively be reduced. The reason why the spiral drill collars are widely used because Non magnetic drill collar of its own characteristics of the decision, this particular spiral drill collars to reduce the contact area between the wall and the tube, thereby avoiding "sticking" phenomenon of the drill string.
4-6% by weight spiral drill collar drill collar round little weight.