Heavy Weight Drill Pipe (short for HWDP) is an intermediate weight drill stem component which is used in conjunction with the drill pipe and drill collars. HWDP is available in standard, spiral and non-magnetic designs. In some applications, heavy-weight also can be used instead of the drill collars.

It designed for tough drilling environments in vertical and directional wells; for vertical wells, HWDP is a transition member; for directional holes it is a weight member and provides additional stiffness to prevent buckling.

Features and Benefits

●  A centre upset or wear pad to increase tube life, reduce hole drag and differential sticking problems.

●  Connections are completed（phosphate coated）to protect them from the elements after machining and to help prevent galling upon initial make-up.

●  Thread roots are cold rolled on API and H-90 connections. And pressed steel thread protectors are supplied for standard connections.

●  Hard banding and Internal Coating can be provided on customer’s request. 

Specifications:

Size(in)	O.D. (in)	I.D.  (in)	Tool Joint  O.D.  (in)	Tool Joint I.D.  (in)	Connection	Max.elevator diameter  (in)	Central upset dia.  (in)	Min.drift dia.size (in)
3 1/2	3 1/2	2 1/4	4 3/4 (4 7/8, 5)	2 1/4	NC38	3 7/8	4	2
		2 1/16		2 1/16				1 13/16
4	4	2 1/2	5 1/4	2 1/2	NC40	4 3/16	4 1/2	2 1/4
		2 9/16		2 9/16				2 5/16
4 1/2	4 1/2	2 11/16	6 1/4	2 11/16	NC46	4 11/16	5	2 7/16
		2 3/4		2 3/4				2 1/2
		2 13/16		2 13/16				2 9/16
5	5	3	6 5/8	3	NC50	5 1/8	5 1/2	2 3/4
5 1/2	5 1/2	3 1/4	7 (7 1/4, 7 1/2)	3 1/4	5 1/2 FH	5 11/16	6	3
		3 3/8		3 3/8				3 1/8
		3 7/8		3 7/8				3 5/8
		4		4				3 3/4
6 5/8	6 5/8	4	8 (8 1/4, 8 1/2)	4	6 5/8 FH	6 15/16	7 1/8	3 3/4
		4 1/2		4 1/2				4 1/4
		5		5				4 3/4