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Theory
 Heavy Weight Drill Pipe (HWDP), was developed to provide a gradual transition from the drill collars to the drill pipe. This HHWDP helps to prevent stress concentration at the top of the drill collar.It also allows drilling at higher rpms, reducing torque and differential pressure sticking. HWDP is intended primarily for directional drilling. As it bends easily, it simplifies directional control and minimizes connection fatigue problems common to high-angle or horizontal drilling. The reduced number of pipe failures and increased drill-stem service also make HWDP appropriate for some straight-hole applications. Various combinations of HWDP, drill collars, and standard drill string can be created to meet the challenge of severe drilling conditions.
Hardbanding
HWDP's wear resistance hardbanding is welded by an automatic machine after preheating the pipe and tool joints.
Standard Bands:
* one 4" wear band on both pin and box end, plus one 1" band on 18°shoulder of box.
* two 3" wear bands on central upsets
the hardbanding is completely flush on both tool joints and 1/8" oversize on the central upset(fully flush on request).
The types of Hardbanding include Iron-Matrix powder alloy, Tungsten Carbide Sparticle, Arnco 100XT AND 300XT and TCS.
Internal Plastic Coating
SFMC HWDP could be coated internally with DPC, TK 34 or TC2000 as customer's request, which are able to prevent corrosion and extend using time.
Initial Make up and Break out service
The factory Make-up and Break-out services, which is the most important factor affecting the life of the connections, is regarded as an important element to greatly improve the efficiency on rig floor. The Controlled Make-up & Break-in procedures are consistently applied to every tool joint and ensure the connections quality. Suitable dope and correct toque value are essential for the Make-up & Break-in procedures. SFMC HWDP will supply perfect factory Make-up and Break-out services if order and inquiries
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