Heavy Weight Drill Pipe

Heavy Weight Drill Pipe (HW DP ) is an intermediate weight drill stem component which is used in conjunction with the drill pipes and drill collars. It has smaller wall thickness than drill collar and bigger wall thickness than drill pipe. We use HWDP between drill pipe and drill collar to prevent sudden change of drill string section and reduce fatigue of drill pipe. HWDP is also a good way to Reducing torque and increase load when we need to drill much deeper. We can save a lot of time by not using lifting sub and safety clamps when we choose HWDP in the drill stem.We use HWDP in directional drilling can keep a highly drilling speed under a lower drilling torque. That reduce the wear and rupture of the drill string. Compared with the drill collar HWDP has low rigidity, and wall contact area is small, so differential pressure sticking will not happen easily.


Heavy Weight Drill Pipe


Integral heavy weight drill pipe is the transition zone between drill collar and drill pipe. It can not only reduce stress-formation in the connection of drill collar and drill pipe, but also reduce the wear on OD.

Integral heavy weight drill pipe is made from one piece of AISI 4145H solid bar, fully heat treated, all physical properties conform to API spec7 latest edition.

DEENPU wear resistance hard banding is standard on tool joints connections and central upset. The types of hard banding include Arnco 100XT and100XT. All threads are phosphated, copperized or cold worked. All connections are equipped with pressed steel thread protectors. All theads are machined with CNC lathes –Double-shoudered and special threads.


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