The Drill Collar Plays The Following Main Roles In The Drilling Process

The Drill Collar Plays The Following Main Roles In The Drilling Process

Drill collars are generally divided into three types: spiral drill collars, non-magnetic drill collars, and integral drill collars.

(1) The integral drill collar is a smooth thick-walled round tube with connecting threads processed at both ends.

(2) The spiral drill collar has three right-hand spiral grooves processed on the outer cylindrical surface of the round drill collar to reduce the contact area with the well wall, which can effectively prevent the drill from being stuck due to pressure difference.

(3) The non-magnetic drill collar is mainly used for monitoring during oil drilling, and its structure is the same as that of the integral drill collar. The non-magnetic drill collar is made of N1310 low-carbon alloy steel, which is forged after strict chemical composition analysis. The material has been tested for mechanical properties to ensure that the hardness, toughness, impact value and corrosion resistance meet the standards, and has good low magnetic permeability and good machining performance. In order to facilitate the drilling work, the outer surface of the internal thread of the drill collar can be processed with hanging card grooves and slip groovesDrill Collar. 

The role of the drill collar in drilling:

 (1) Apply drilling pressure to the drill bit;

 (2) Ensure the necessary strength under compression conditions; 

(3) Reduce the vibration, swing, and jump of the drill bit, so that the drill bit works smoothly; 

(4) Control the well inclination.