Home / News / Transocean rig sets world record for longest extended-reach well

Transocean's GSF rig 127Transocean’s jackup GSF Rig 127 has drilled the world’s longest extended-reach well offshore Qatar, at 40,320 ft MD.

Transocean’s jackup GSF Rig 127 recently set a world record for the longest extended-reach well ever drilled at 40,320 ft (12,289 m) MD with a 35,770-ft (10,902-m) horizontal section. The well was drilled offshore Qatar in 36 days and incident-free. The new record of 7.6 miles is also the first well in the history of offshore drilling that exceeds 40,000 ft (12,191 m). The well surpasses by approximately 2,000 ft the prior extended-reach record of 38,322 ft (11,680 m) MD set with a land rig drilling at Sakhalin Island earlier this year.

Transocean rig sets world record for longest extended-reach well

The rig crew worked with the operator, Maersk Oil Qatar AS, to overcome constraints such as high drilling torque in parts of the horizontal section. The Well BD-04A is in the Al-Shaheen field offshore Qatar. Crews also used extensive deck-management planning and a supply boat to hold additional drill pipe so that the rig could stay within its variable deck load rating.

“Everyone involved deserves congratulations for coming together and through great planning and teamwork managing the challenges on this well in an incident-free manner,” said Jim Granger, performance rig manager.

The rig, a Friede & Goldman L-780 Mod II design jackup with 250-ft water depth capability, operates with just two Emsco FB 1600 mud pumps. Other equipment include the rig’s 2000-hp National 1320 UE Drawworks, and a Varco TDS-4S Top Drive.

In addition to its record-setting performance, GSF Rig 127 crews last April reached one year without a lost-time injury.

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