Sakhalin-1 Sets New Extended Reach Drilling Record

Rosneft announced Tuesday that the drilling of the world's longest well has been completed at the Chayvo field in the Russian Far East.

The Sakhalin-1 Consortium, which includes Rosneft, used the Orlan drilling platform to drill the O-14 production well to a word-record measure depth of 44,294 feet with a horizontal reach of 39,480 feet (or 7.5 miles). Rosneft said that the record was achieved due to the use of ExxonMobil's proprietary Fast Drill process that allows bottleneck identification in the drilling process as well as the development of optimal drilling and completions solutions.

Rosneft noted that since the beginning of its drilling program in 2003 Sakhalin-1 has set several world records in extended reach well drilling, with the consortium currently holding drilling records for nine out of 10 of the world's longest wells.

In 2013, the Sakhalin-1 project set two consecutive world records for measured depth. The Z-43 well reached 40,848 feet of measured depth while the Z-42 well achieved 41,669 feet measured depth and a horizontal reach of 38,516 feet 

Rosneft boss Igor Sechin commented in a company statement:

"This well continues successful implementation of our outstanding project. I would like to express my thanks to our partners – ExxonMobil. Usage of their drilling technologies made this achievement possible."

Chayvo is one of the Sakhalin-1 project's three fields. Located northeast from Sakhalin Island's shore, the field was put into operation in 2005. The Sakhalin-1 project as a whole contains ultimate recoverable reserves of 1.7 billion barrels of oil and 17.2 trillion cubic feet of gas. Since the project began it has produced more than 587 million barrels of oil and 565 billion cubic feet of gas.

Rosneft holds a 20-percent stake in Sakhalin-1, while ExxonMobil holds 30 percent. SODECO and ONGC VIdesh hold 30-percent and 20-percent interests respectively.



A former engineer, Jon is an award-winning editor who has covered the technology, engineering and energy sectors since the mid-1990s. Email Jon at


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