Drill collar is mainly used to provide drill pressure for drill during the process, makes the drill pipe in tension status, and straighten the drill with its larger rigidity and maintain well track.
The spiral drill collar and non-magnetic drill colar belong to special ones among drill collars, the spiral drill collar is processed with three spiral grooves on the column surface, to reduce the contact area with well wall, spiral drill collar could effectively prevent differential pressure and sticking of drill. While non-magnetic drill collar mainly used for monitoring during the process.
The drill collars include glaze drill collar, spiral drill collar, and drill collars with slip groove, elevator groove and wearing ring. We can supply the length from 5 feet to 32 feet, and outer diameter from 3-1/8inch to 11inch.