Rotary steerable, directional-drilling systems increased ROP (rate of penetration) and saved more than 100 days of rig time when used to drill complex 3D well-paths in the 12 1/4-inch and in 8 1/2-inch hole sections of Jotun field development wells, compared to conventional directional-drilling systems. The Jotun field lies 165 km off Norway in 127 m of water. Esso Norge AS developed the field, from a wellhead platform using a fit-for-purpose, new-build rig, with complex directional horizontal producers in the Paleocene, Heimdal sandstones at about 2,050 m TVD (total vertical depth) subsea. Drilling operations experienced no hole problems or wellbore instability during the 15-well Jotun drilling campaign. The company attributed the success to improved hole cleaning form drill-pipe rotation, as opposed to sliding, and to faster drilling times that reduced shale instability risks. Rotary-steerable systems provided greater directional-steering accuracy and drilling efficiency in extended-reach drilling applications because drillstring sliding in the wellbore was not required to maintain directional control.
Rotary-steerable technology lowers drilling time, well costs
In der Nordsee sparte das Rotary-Richtbohrverfahren Bohrzeit und Geld
Oil and Gas Journal ; 100 , 20 ; 39-43
2002
5 Seiten, 5 Bilder, 2 Tabellen, 1 Quelle
Article (Journal)
English
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