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  • Bit improvements, LWD telemetry and RSS combine to speed penetration. Valhall field is located in the North Sea, about 290 km (180mi) offshore southern Norway in a 69-m (226-ft) water depth. The known drilling challenges of the soft-chalk Valhall reservoir include: • Difficulty building inclination • Localized sub-seismic resolution faulting • Higher-pressured, unstable Lista Shale above the reservoir • A higher-pressured Hod formation below the reservoir • Geosteering through the reservoir • Anti-collision issues • Depleted zones • Hole cleaning • Torque and drag • Liner running and setting. While drilling the overburden from a crestal location in Valhall field, BP experienced difficulties that resulted in a failure to set the 9-5/8-in. casing on several Extended Reach Drilled (ERD) wells. A new well design countered this problem. A wellbore stability study concluded that, for the ERD infill wells, there would be less risk if the wells were drilled at a lower angle from a flank location.


    M. Strachan, S. Kinn, O. Eide, C. Mason, and D. Chen

    Penetration was aided by bit improvements, LWD telemetry and RSS’s.

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