THE ADVANCES in drilling technology required to drill ultra-deep and ultra-extended-reach wells is not reserved to rig capability. Drill pipe performance factors, high-torque connections and hole cleaning also can become limitations in extending the well envelope. Meeting the performance requirements imposed by these deepwater, hostile environments and extreme well profiles is challenging for any drillstring manufacturer. Deeper and more deviated wells require a drillstring with increased tensile load capability, greater torque capacity and a higher strength-to-weight ratio to overcome high frictional drag forces and improve hydraulic performance, rate of penetration, control of the well trajectory and hole cleaning.
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