DRILL STRING ACCESSORIES

DP – MASTER DRILL STRING ACCESSORIES

DP-Master offers pup joints and rotary subs to compliment the drill string. A complete range of drilling subs, floor subs and pump-in subs are manufactured in accordance with industry standard or client specific specifications.

DP-Master pup joints are available in 5’, 10’, 15’ and 20’ standard lengths. Pup joints up to 5’ length are integral manufactured similar to the same stringent specifications used for drill collars.
Those above 5’ are produced as welded assemblies which are designed and manufactured in accordance to DP-Master drill pipes.

Special sizes pup joints are also available upon request.

DP-Master rotary subs include;
• Straight OD subs
• Reduced section OD subs
• Crossover subs
• Bit Subs
• Saver Subs
• Side Entry Subs
• Pump In Subs
The rotary subs are available in standard sizes specified in API and in a full range of connection combinations. Special sizes and configurations are available upon request.

DP-Master offers lift subs and lift plugs from size 3-1/8’’ to 11’’ manufactured to the same specifications used for drill collars.

All accessories except welded pup joints are manufactured from solid modified alloy steel bars similar to drill collars which are fully heat treated to the required chemistry and mechanical properties. The internal bore is trepanned with precision and machined to size with comprehensive quality control.

At request, connections can be cold rolled after machining and phosphate to reduce galling and corrosion.

In addition, pup joint fatigue strength can be improved by incorporating stress relief features on API pin and box connections. DP-Master high performance DPM-DS and DPM-MT connections can be machined on accessories to ensure compatibility to drill string already using DPM-DS or DPM MT connections.