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Spiral Drill Collar/ Slick drill collar/ Oil drill toolsProduct description: Sprial collar is processed by AISI4145H rolling or forging chrome molybdenum alloy steel. Chemical composition and microelement are effectively controlled. By adding three spiral flutes into the outside cylinder surface of the co mm on spiral collar, spiral collar lessen the contact area and friction force with the well face, keep the slurry moving evenly around the spiral groove, keep the drilling string balance, and prevent pressure differential sticking effectively. The Main Technical Specification of Spiral Drill Collar
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