This can be defined as wells having a horizontal displacement to true vertical depth ratio of at least 2:1 and could get to the current maximum of about 11:1.
On the 28th of January 2011, one of the world’s longest boreholes was drilled at the Odoptu field, Sakhalin-I with a measured total depth of 12345m, horizontal displacement of 11475m, and true vertical depth of 1784m.
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| Schematic representation of the extended-reach wells drilled from the Yastreb rig onshore to the Odoptu reservoirs over 11Km offshore and 1800m below the Sea of Okhotsk. The subsurface cutaways depicted are for ease of visualization only. Graphics courtesy of ExxonMobil. Culled from http://www.worldoil.com website. |
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