Heavy weight drill pipe (HWDP)

Heavy Weight Drill Pipe is designed for creating axial load to the drill bit, for improving rigidity and stability of the lower part of the drill string when drilling inclined and horizontal wells.

 

BASIC SIZES OF HWDP

Diameter of tooljoint part, inch	Diameter of HWDP body, inch	Bore, inch	Tool joint thread, API
4 3/4	3 1/2	2 1/4	NC-38
5 1/2	4	2 1/2	NC-40
6 1/4	4 1/2	2 11/16	NC-46
6 5/8	5	3	NC-50
7	5 1/2	3 1/4	5 1/2 FH

 

Types of HWDP design:

With a tapered elevator shoulder, without center upsets, with spiral grooves;

With a square elevator shoulder, without central upsets, with spiral grooves;

With a tapered elevator shoulder, with one central upset;

With a square elevator shoulder, with one central upset;

With a tapered elevator shoulder, with two central upsets;

With a square elevator shoulder, with two central upsets.

 

Length: 31 ft (standard), other lengths can be done on demand of the customer (from 26 ft

up to 37.7 ft).