US Patent 7,347,459
Running Standard downhole casing applications
Rotating To aid string advancement
Drilling with Casing / Drilling with Liners
Driving
For use in non-abrasive environments
Specialty semi-premium connection machined from heavy-wall coupling stock and forged blanks. The GB CDE Connection performances exceed that of standard API connections. Connections are designed with refined API BTC Threads and will make up with off-the-shelf API BTC threaded accessories. Innovative, triple taper thread design (box only) reduces localized bearing stresses in critical areas for improved fatigue resistance. Pin noses engage shoulders in the coupling center for positive indication of proper field makeup. Pin noses, designed for maximum bearing face area, provide high torque resistance