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Drill collar -Anson

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  • Published date: December 4, 2015
  • Modified date: February 23, 2016
    • China, International

Drill collar is a device used on the bottom of drill string. It is a major component of the bottom hole assembly (BHA). The main feature of drill collar is great wall thickness (typically 38 ~ 53mm, the equivalent of 4 to 6 times of drill pipe), as well as great gravity. It has good rigidity, exposing pressure on drill bits during rock fragmentation and playing a guiding role during the straight-hole drilling.


Anson has a unique frequency induction heating quenching and tempering on heat treatment of its drill collars. In this process, the steel unit is rotated forward continuously and uniformly heated. In the quench hardening process, to obtain a consistent and high strength, we adopt the ring and external spray water cooling method in particular. The total drill collar material can be subjected to the hardness of 285 to 341 Brinell after heat treatment of 1 inch from the surface. Anson can provide drill collars from 5 feet to 32 feet, outside diameter in the range of 3-1 / 8 "to 11."

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