Heavy Weight Drill Pipe (HWDP)

Heavy weight drill pipe (HWDP) is the intermediate-weight member of the drill string, run between the drill pipe and the drill collars. Its wall is thicker than the drill pipe it runs with, giving higher strength and tensile capacity and reducing drill pipe fatigue.

HWDP is available with welded-on tool joints or as an integral piece machined from a trepanned 4145H MOD bar, in 55, 70, 75, 95 and 110 ksi (integral) material, in standard, spiral and non-magnetic designs. A center upset (wear pad) extends tube life and reduces drag and differential sticking.

Applications

• Vertical drilling: weight-on-bit, transition and fatigue-resistant member, replacement of drill collars
• Directional, horizontal and extended-reach drilling: weight-on-bit, prevention of differential sticking and string lock-up, BHA directional control
• Remedial operations: weight for milling, under-reaming and hole opening

Standard features

• Pipe body OD from 2-7/8" to 6-5/8", Range 2 and 3, to API 7-1 and 7-2
• API and double-shoulder connections
• Extra-length tool joints for re-cuts and longer service life
• Cold-rolled threads, API pin stress-relief groove and box bore-back
• Casing-friendly hardbanding on box, pin and center upset; phosphate-coated threads

Options

• Integral construction; spiral, full-spiral or tri-spiral central section
• Internal plastic coating; NS-1, DS-1 or customer specifications
• High-performance double-shoulder connections; API, sour service and NS-1 steel grades

Specifications