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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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