The World’s Longest Well
Rosneft, as a member of the Sakhalin-1 Consortium, successfully completed drilling of the world’s longest well from the Orlan platform at the Chaivo field in the Sea of Okhotsk. The length of the well with horizontal completion is 1,5000m which currently is a world record. This is a super complex well with DDI (Directional drilling index) of 8.0 and 14,129m step-out. A number of world records have been set in extended reach drilling since the start of drilling at Sakhalin-1 project in 2003. Taking into account the new record long well, the Sakhalin-1 Consortium drilled nine out of ten of the world’s longest wells.
Sakhalin-1 extended reach drilling is among the fastest in the world owing to the advanced and efficient technologies such as ‘Fast Drill’. This technology combines high quality modeling of physical parameters of drilling with a structured approach to well designing. Extended reach drilling reduces costs of construction of additional offshore structures, pipelines and other field infrastructure facilities and it also mitigates environmental impact due to smaller drilling and production footprint. Since 2013 the project has set five world records for measured depth of wells, with development well О-14 with length of 13,500m drilled in 2015 being the deepest.
Sakhalin-1 includes three offshore fields: Chaivo, Odoptu and Arkutun-Dagi located located north-east from Sakhalin. At Chaivo water depth ranges from 14m to 30m. Water depth in the area of the Orlan platform, with drilling and accommodation modules, is 15m. Distance to shore is 5km (the nearest boundary) and 15km (distant boundary). The Chaivo field was commissioned in 2005. Installation of the Orlan platform was completed in July 2005 and drilling started in December 2005.
The platform has minimum structures for crude treatment because of produced oil is delivered to the Chaivo Onshore Processing Facility. Orlan is used for development of the south-western and south-eastern part of the Chaivo field. Orlan’s steel and concrete foundation easily withstands ice and giant icepacks reaching the height of a six-floor building.
Sakhalin-1 is the first large-scale offshore project in Russia implemented under the PSA conditions (concluded in 1996). Project participation shares:
- Rosneft, 20%
- ExxonMobil, 30%
- SODECO, 30%
- ONGC Videsh, 20%.
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