Spiral drill collar is one kind of our product series. This kind of drill collar can prevent the block from differential pressure in the process of drilling. With the flow of the freedom of mud around the drill collar, the spiral grooves can keep equilibrium and prevent the formation of block. It can effectively keep the jamming of the drill tool from pressing badly and reduce the contacting areas with well wall and revolution resistance. It’s the own characteristics that dicides the widespread use of spiral drill collar.
The spiral drill collar our factory produce is made from AISI　4145H alloy steel, all its physical properties conform to the latest API Spec7 and SY/T5144. And the most important of all is that we can produce the helical groove, stress dispersion tank, elevator groove and slip groove on the drill collar according to the customer's requirements.