Integral heavy weight drill pipe are made of AISI 4142H - 4145H alloy
structural steel. Production complies with the provisions under the Standard
SY/T 5146-1997. Connector screws comply with the provisions of the Standard API
SPEC 7. Heavyweight drill pipe is a kind of drilling tool of medium weight
which is similar to the drilling rod. Its wall thickness is greater than that
of the drill rod but smaller than that of the drill collar. The prolonged tool
joint is linked to the pipe with thick walls. Generally, it is placed between
the drill rod and the drill collar during the formation of the drilling string
to prevent the unexpected change in the section of the drill string and reduce
fatigue of the drill rod. It can be used for directional well drilling, to work
quickly when the torque is rather low in order to cut wear and damage of
drilling string. As its steel performance is lower than that of the drill
collar and the contact area on the well wall is small, differential pressure
jamming is rare.