Description
Drill Collar is the basic component in the BHA
which provides weight on the bit for drilling and
keeps the drill string in tension.
Fengliang Drill Collar is manufactured from
AISI 4145H modified quenched and tempered
steel and is heat treated along its entire
length for uniform toughness and durability.
Strict metallurgical tests are performed per
specifications to ensure that the heat treatment
produces consistent and maximum hardness
through the depth of the bar.
Features and Benefits
● A hardness range of 285 to 341 BH N
and a Charpy impact value of 40 lbs/ft are
guaranteed for evenly distributed 16 points in
any cross sections at room temperature;
Specifications - Drill Collar
● Connections are phosphate coated after
machining to protect the threads from
corrosive elements and to prevent galling
upon initial make-up;
● Thread roots are cold rolled on API and H-90
connections;
for all drill collar that are equipped with
standard connections
When ordering please specify:
● Drill collar OD and ID;
● Overall length;
● Connections required (size and type);
● Special features desired, for example:
Slick or Spiral;
Stress Relief Features;
Slip and/or Elevator Recess;
Hardbanding;
