New slimhole, rotary-steerable system drills first field test

Shell UK Exploration & Production (Shell Expro) and Schlumberger Oilfield Services announced in April that they had successfully field tested a 43/4-in. slimhole rotary steerable drilling system in the North Sea Brent Delta field, a test they believe to be a first.The rotary-steerable system, which Schlumberger calls the PowerDrive Xtra 475, drilled 2,377 ft of 61/8-in. wellbore in 43.5 hr and achieved an average penetration rate of 67 fph (OGJ, May 13, 2002, p. 8).Given the complex well profile, requiring 3D steering to intersect multiple targets, the drilling method saved 8.42 days compared to drilling a typical 61/8-in. wellbore section, according to the companies in a press statement....

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