Drill Collar
Drill Collar
Drill Collar is the basic component in the BHA
which provides weight on the bit for drilling
and keeps the drill string in tension.
TOPTECH 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 BHN
and a Charpy impact value of 40 ft-lbs are
guaranteed for evenly distributed 16 points in
any cross sections at room temperature;
Non-Magnet Drill Collar
The Non-magnetic drill collars function as a housing for the MWD
tools, while at the same time provide the weight for drill string.
TIANHE non-magnetic drill collars are suitable for all types of drilling
including straight and directional applications.
Each drill collar is fully inspected by our internal inspection
department. All data obtained are recorded on the inspection
certificate furnished with each drill collar. API monogram, serial
number, OD, ID, type and size of connections are stamped on the
recessed mill flats.
We manufacture three type of non-magnetic drill collars according to
the customers’ order; include Slick, Spiral, and Flex Non-Mag Drill
Specification
