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GB WS
GB HB

US Patent
7,347,459

Applications


Running  Standard Downhole Casing Applications

Rotating  To aid string advancement

Drilling  with Casing / Drilling with Liners

Driving


For use in abrasive environments.



Description

Specialty semi-premium connection machined from API Coupling Stock providing a low-cost Drilling with Casing/Drilling with Liner Connection. Like the GB CD Connection, both the GB WS and GB HB 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 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.

GB WS has integral, sacrificial wear sleeve to protect the leading edge and critical areas of the connection that commonly wear during drilling operations. For the most abrasive environments the wear sleeve can be furnished with hard-facing (GB HB).

GB WS and GB HB

Drilling with Casing Connection

WS – Wear Sleeve
HB – Hardbanded

Features

  • 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.
  • Enhanced fatigue life.
  • Excellent make/break repeatability under field conditions.
  • 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 Triple Taper Design reduces localized bearing stresses for enhanced fatigue resistance and reduced galling potential.
  • Integral, Sacrificial Wear Sleeve on Leading Edge.
  • High Torque resistance.
  • Drive-able.

Available

  • Casing sizes 4 1/2" OD to 20" OD (lighter walls).
  • All API Casing Grades and 16" OD through 20" OD Line Pipe; Grades X-56 and X-80.

Hard-Banding Options

  • Tesco Fusion-clad



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