OCTG – Heavy Weight Drill Pipe (HWDP)
A Heavy Weight Drill Pipe (HWDP) is a tubular pipe that adds weight or acts as a transitional piece in the drill string, looks like a normal drill pipe except for an upset centered along the tube which helps to prevent excessive buckling.
HWDP, As a transitional section of the drill string, it is placed between the drill collar and standard drill pipe to reduce fatigue failures, typically between the stiff and rigid drill collars and the relatively light and flexible drill pipe joints to reduce fatigue failures directly above the bottom hole assembly.
In other applications the HWDP is used as an additional weight to weigh down the drill string. Its wall thickness is up to 3 times that of a similar-sized normal drill pipe.
HWDP is used most commonly in directional drilling because it bends more easily and helps to control torque and fatigue in high-angle operations. HWDP is manufactured in accordance with API Spec. 7/7-1 guidelines.
Conventional Heavy Weight Drill Pipes come in two configurations: Welded and Integral.
The welded configuration is manufactured by friction welding of extra long tool joints to a thick well tube while the Integral configuration is machined from a solid bar of AISI4145H alloy steel.
An additional option is the Heavyweight Spiral Drill Pipe, which has spiral grooves cut into the external surface for reduced differential sticking and improved hole-cleaning.
Products are manufactured to API Spec.7/ 7-1 where applicable and can come customized with additional features and proprietary connections of leading manufacturers per your requirements.