Geosteering precisely places multilaterals in Norway’s Troll field

Eirik Skarsbø, Norsk Hydro Produksjon AS, Bergen, NorwayKlaus Dieter Ernesti, Baker Hughes INTEQ, StavangerIn Norway’s Troll field, Norsk Hydro Produksjon AS and its service partners drilled the complex Starfish well in June 2005 with five laterals from a single slot. The objective was to position the well bores precisely in thin oil layers to contact more than 13,000 m of the reservoir.For accurate geosteering, the drilling team designed an integrated bottomhole assembly consisting of a rotary steerable drilling system, acoustic porosity logging LWD system, a real-time drilling dynamics diagnostics service, and an application-specific PDC drill bit. The BHA drilled the preci...

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