Offshore staff
MOSCOW – The Sakhalin-1 production-sharing agreement offshore eastern Russia recently marked its 25th anniversary.
According to consortium member Rosneft, it remains one of the major Russian projects with foreign direct investment, as well as a pioneer in technologies for production in sub-Arctic settings. The other partners are ExxonMobil, ONGC Videsh, and Japan’s SODECO.
Sakhalin-1 encompasses development of the offshore Chayvo, Odoptu, and Arkutun-Dagi fields on the northeastern shelf of Sakhalin Island.
Chayvo’s northwestern part was developed via wells from shore drilled by the Yastreb rig, while the field’s southwestern section produces through the Orlan offshore platform.
Odoptu, 70 km (43 mi) north of the Chayvo drilling site, also produces through wells drilled from the Yastreb.
Arkutun-Dagi is an oil and gas field 25 km (15.5 mi) offshore the northeast of Sakhalin Island. This field has been developed through the Berkut offshore drilling and production platform.
All production is sent to the Chayvo onshore treatment facility where capacity was recently increased via the introduction of additional equipment. Last year the facility achieved a treatment capacity of 41,000 metric tons/d (45,195 tons/d).
Cumulative output of oil and condensate from the three fields to date is over 125 MM metric tons (137.8 Mm tons), with over 28 bcm of gas supplied to Far East consumers.
Rosneft estimates the project’s recoverable reserves at 307 MM metric tons (338 MM tons) of oil and 485 bcm of gas.
Among the technical accomplishments, nine of the world’s 10 longest wells have been drilled on the field, the record currently held by a 15,000-m (49,212-ft) long well drilled from the Orlan platform, with a vertical deviation of 14,129 m (46,355 ft).
The upper part of the Berkut platform, weighing about 42,000 metric tons, represents the heaviest topsides installed on the high seas via the thrust method, Rosneft added.
07/09/2020
