Non Stop Driller^© Subs

All drill pipe connection sizes, connection types and H2S rated Subs as required for your drill string can be prepared at short notice

• Saves time circulating hole clean prior to a connection
• Saves time re-establishing steady circulation after connection
• Saves time dealing with drilling problems, like hole cleaning, kick/loss, stuck pipe, hole collapse, etc
• Substantially reduces overall connection time
• Rig pump circulation is never stopped during switch over from Top Drive to NSD sub, and back
• NSD is the only continuous circulation sub system available for 6 5/8” drill pipe, with 7500 psi standpipe pressure