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  • Norway: New tool improves through-tubing rotary drilling


    G. Swietlik and J. Oyovwevotu

    Norsk Hydro’s Njord field is about 130 km (81 mi) northwest of Kristiansund and 30 km (19 mi) west of Draugen field on Blocks 6407/7 and 6407/10, in 330 m (1,083 ft) of water. The densely faulted, complicated field has 15 subsea wells producing through a semisubmersible production platform. The reservoir includes the Lower Jurassic Tilje formation (89% of the field’s oil) and Middle Jurassic Ile formation. Field recovery factor is low, because of heavy faulting, unconnected reservoir segments and a depletion drive mechanism in the northern and central areas. Production began declining by 2003, at which point Through-Tubing Rotary Drilling (TTRD) was identified as the most cost-effective way to carry out infill drilling to improve field recovery. The first subsea TTRD sidetrack (6407/7-A-9 AH) was drilled in May 2004 from the Njord A floating production platform.

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