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GB CDE Drilling with Casing Connection

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CDE – Casing Drilling Enhanced


GB Casing Drilling Enhanced is used for conventional running, rotating to aid in string advancement, drilling with casing/liners, or driving. Internal shoulder for heavier wall pipe.


  • Running Standard downhole casing applications
  • Rotating To aid string advancement
  • Drilling with Casing / Drilling with Liners
  • Driving


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, multiple 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.


  • Uses API BTC Pin Threads (Slightly Modified).
  • Tighter diametric tolerances for enhanced performance.
  • Meets API Coupling OD and Drift Diameter Specifications.
  • Inter-changeable with API BTC accessories.
  • Field proven in a variety of static and dynamic applications.
  • Excellent make/break repeatability under field conditions.
  • Enhanced fatigue life.
  • Drive-able.
  • High Torque resistance.
  • Integral Sacrificial Wear Sleeve on Leading Edge.
  • Full Scale laboratory cyclic tests demonstrate enhanced fatigue life.
  • Can be inspected with standard API Thread Gauges by any properly trained/experienced Third Party.
  • Positive makeup indication with pin nose engagement in center of connection.
  • Also has API Triangle Stamp on Pin for secondary makeup verification.
  • Innovative Multiple Taper Design reduces localized bearing stresses for enhanced fatigue resistance and reduced galling potential.


  • Casing sizes 4 1/2″ OD to 20″ OD (lighter walls).
  • All standard casing grades up to Q-125.

Running Procedures


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