-- First 4 ¾-in. slimhole rotary steerable well drilled in North Sea field
Shell UK Exploration & Production and Schlumberger Oilfield Services claim to have achieved a world first for the successful field test of a 4 ¾-in. slimhole rotary steerable drilling system in the North Sea. The field test was performed for Shell Expro, which operates in the UK North Sea on behalf of Shell and ExxonMobil Corp. subsidiary Esso, in Brent Delta field.