Heavy Weight Drill Pipe

Thick-walled pipe, called Heavy Weight Drill Pipe (HWDP), was developed to provide a gradual transition from the heavy drill collar to the relatively lightweight drill pipe. This intermediate-weight pipe has a wall thickness of approximately 1, and helps prevent stress concentration at the top of the drill collar. It also allows you to drill at higher rpms, reducing torque and differential pressure sticking. HWDP is intended primarily for directional drilling. Because 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.

Thick-walled pipe, called Heavy Weight Drill Pipe (HWDP),