The Milne Point field in Alaska produces from the Kuparuk,rnSchrader, and Ugnu formations. The Kuparuk formationrncontains light oil, while the Schrader and Ugnu contain heavyrnoil. The ranges of viscosities are 200 to 10,000 cp in the Ugnu,rn20 – 200 cp in the Schrader, and about 3 cp in the Kuparuk.rnOver 200 wells have been completed in the Kuparuk andrnSchrader formations at Milne Point. The Ugnu contains thernlargest oil in place in the field; however, it has not beenrndeveloped yet due to the high oil viscosities. To date, only onernwell has been completed in the Ugnu.rnBP is engaged in new studies to find a way to make thernUgnu commercial. This paper discusses an attempt to identifyrnlower-viscosity “sweet spots” within the Ugnu using nuclearrnmagnetic resonance (NMR) measurements.rnIn 2004, full suites of logging while drilling (LWD) andrnwireline data were acquired in two newly drilled wells. Thernprimary goal was to compare viscosity predictions from NMRrnlog measurements to geochemical measurements made onrnfluids extracted from core plugs. For the first time, on a foot-by-rnfoot basis, using LWD NMR, lower viscosity sweet-spotsrnwere identified in the viscous Schrader formation and in thernvery heavy oil in the Ugnu formations.
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