heavy weight drill pipe

Thick-walled pipe called heavy weight drill pipe was developed to provid a gradual transition from the heavy weight drill collars to the relatively light weight drill pipe. This intermediate weight pipe has a wall thickness of approximately, and it helps prevent stress concentration at the top of the drill collars. It also allows you to drill at higher pms, reducing torque and differential pressure sticking. It 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 it appropriate for some straight hole applications.
Hardbanding:
The wear-resistance hardbanding is standard on tool joints connections and central upset. Hardbanding is made by an automatic machine after preheating the pipe and is followed by stress relieving. The Type of handbanding includes Iron-Matrix powder alloy, Tungsten Carbide particle, Arnco 100XT, Arnco 300XT
Standard Bands:
One 4" wears band on both pin and box ends, plus one 1" band on 18 degree shoulder of box. Two 3" wear bands on central upsets The hardbanding is completing flush on both joints and 1/8" oversize on the central upset (full flush on request).
Internal Coating:
TThe HWDP could be internally coated with DPC (Equivalent to TK34) as customers request which are able to prevent corrosion and extend life.
Heavy Weight Drill Pipe List

Nominal size	Pipe body				Tool joint				Weight Kg/Piece
	OD(mm)	ID(mm)	Upset dimension		Thread type	OD(mm)	ID(mm)	HSC bevel dia DF(mm)
			Center dia. Dm (mm)	End dia.DTE (mm)
3 1/2	88.9	57.4	101.6	98.4	NC38(3 1/2IF)	127	52.4	116.3	312
4	101.6	65.1	114.3	106.4	NC40(4 FH)	133.4	65.1	127.4	370
4 1/2	114.3	69.9	127.0	119.1	NC46(4 IF)	158.8	69.9	145.3	558
5	127.0	76.2	139.7	130.2	NC50(4 1/2)	168.3	76.2	154.0	672
5 1/2	139.7	92.1	152.4	144.5	5 1/2 FH	184.2	92.1	170.7	776
6 5/8	168.3	114.3	184.2	176.2	6 5/8 REG	203.2	144.3	195.7	964

Material：AISI 4145H or AISI 4145H MOD or AISI 4130
Type: Integral spiral and welded
Length: R2 or R3
OD size range: 3 1/2"~6 5/8"
Connection Thread: IF FH REG

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