Spiral drill collars

Spiral drill collars are widely used because of their maintenance features. The special grooves  decrease the volume of the contact between the well side and the pipe. It leads to the decrease of the tack of the pipe and to turning of the drill pipe string.
The weight of round drill collars will be reduced  approximately 4-6% by spiral conversion.

Spiral drill collars are one kind of the products of our company. Spiral grooves make mud circulate freely around the drill coll