Since its release in 2018, the DUO® family of high torque connections had achieved successful exposure throughout North America. In the fall of 2021, a 5000 meter 4½” sour service drill string with 400DUO® connections was deployed with an operator in north east British Columbia.
The string was operated on 4 drilling rigs with 2 drilling contractors which exposed the string to various handling situations. Each drilling rig was provided training by Complete Tubular on the 400DUO® design, features, and handling procedures. While operating the 110KSI tool joints at a recommended 24700 ft-lb of make-up torque, the string was inspected following each pad with 40000-50000 meter inspection intervals. To date a total of nine inspections have been completed and approaching half-a-million meters drilled.