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What Does Drill Collar Mean?
A drill collar is a drill string component that is used to provide weight on the bit for drilling purposes. The weight of the drill collar helps stabilize the drill and keeps the drill in tension, thereby increasing the cutting efficiency of the bit. Drill collars are usually constructed from thick-walled carbon steel, but can also consist of nonmagnetic steel, copper and other metal alloys.
The drill collar is typically 30 to 90 feet long and threaded at both ends, male at one end and female at the other, to allow multiple drill collars to be joined above the bit assembly. The number of drill collars attached to a drill string will depend upon the material composition of the strata at the drill site and the likely depth of the well.
TYPES OF DRILL COLLARS
There are two main types of Drill Collars: Slick and Spiral. Both types are thicker-walled, more rigid, and heavier than Drill Pipe.
Slick drill collars are, as the name implies, slick. It is a smooth, rounded, thick-walled section. These are typically used in scenarios that require more contact with the wall of the wellbore.
The newer and more common type of drill collar is called spiral. The spiral drill collar is best suited for extreme drilling applications. Spiral grooves allow mud to circulate freely around the drill collar body thus relieving the pressure difference to reduce the occurrence of differential pressure sticking.
TECHNICAL SPECIFICATION:
| Material | AISI4145H, 4145H Mod, non-magnetic material |
| Standard | API Spec.7-1and NS-1 |
| Type | Slick Drill Collar, Spiral Drill Collar, Short Drill Collar |
| Special Feature | Threads Cold Rolled; Pin Relief Groove and Box Bore Back; Elevator and Slip Recess; Hard banding |
To learn more, or get high-quality Drill Collars from DIC Oil Tools, Contact us at: info@dic-oiltools.com.
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