Talisman tests new drilling system in Central North Sea

07/03/2006
Coupling a drilling motor with a high-speed rotary steerable tool and new steerable bits is a successful approach to drilling the Cretaceous section in cost-sensitive, mature North Sea fields.The Central North Sea (CNS) Cretaceous formations are notoriously difficult for performing directional drilling operations. Oriented drilling using bent-housing steerable motors is troublesome and rate of penetration is unacceptably slow with rotary steerable systems. This has historically resulted in well trajectories being planned with minimal directional course changes through these sequences.When directional course changes are absolutely necessary, oil-based mud is often required to facilitate dr...
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