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