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Main function and classification of the drill collars

2013-12-23 13:46:01

Drill collars is in lower part of the drill string, is the main component of bottom hole assembly. Its main feature is the wall thickness (usually 38~53mm or 4~6 times the drill pipe wall thickness), have greater weight and stiffness.

The main role of the drill collars in the drilling process is the following aspects:
(1) applied to the drill bit pressure;
(2) ensure the necessary strength under compression conditions;
(3) reduce the vibration drill, swing, and beat, so that the drill steady work;
(4) Control inclination.

Drill collars is generally divided into three kinds: spiral drill collars, non-magnetic drill collars, drill collars whole.
(1) Overall drill collar is smooth walled pipe, threaded at both ends of the connection process.
(2) processing of three spiral drill collars in the right-handed circularly cylindrical outer surface of the drill collar spiral grooves to reduce the area of ​​contact with the wall, can effectively prevent differential sticking
(3) non-magnetic drill collar is mainly used to monitor the process of oil drilling, drill collars with the overall structure of the same. Non-magnetic drill collars are manufactured using the N1310 low-carbon alloy steel, the material is a rigorous analysis of the chemical composition forged. The mechanical properties of materials have been tested to ensure the hardness, toughness, corrosion resistance and impact value standard, with good low magnetic permeability and good mechanical workability.
For convenience, the drilling work, to the outer surface of the processing within the drill collar hanging slot and threaded grooves in the slips.


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