ExxonMobil celebrates new discovery at Longtail-3 offshore Guyana

ExxonMobil celebrates new discovery at Longtail-3 offshore Guyana

June 10, 2021 / 12:50 PM The well was drilled using the Stena DrillMAX vessel, encountering 230ft of net pay, including newly identified, high quality hydrocarbon bearing reservoirs below the original Longtail-1 discovery.

Mike Cousins, senior vice president of exploration and new ventures at ExxonMobil, said: “Longtail-3, combined with our recent discovery at Uaru-2, has the potential to increase our resource estimate within the Stabroek block, demonstrating further growth of this world-class resource and our high-potential development opportunities offshore Guyana.

“We will continue to leverage our core competitive advantages in our ongoing exploration campaign, delivering substantial value to the Guyanese people, our partners and shareholders.”

ExxonMobil deployed two additional drillships in the first quarter of 2021 — DrillMAX and the Noble Sam Croft — to enable further exploration and evaluation, while continuing development drilling activities offshore Guyana.

As the company advances its 15-well campaign in the Stabroek block, DrillMAX will move to Whiptail-1, while the Noble Sam Croft supports development drilling for Liza Phase 2.

In other drilling activity in the Stabroek Block, the Mako-2 evaluation well confirmed the quality, thickness and areal extent of the reservoir.

When integrated with the previously announced discovery at Uaru-2, the data supports a potential fifth floating production storage and offloading vessel in the area east of the Liza complex.

The Koebi-1 exploration well in the Stabroek block has shown evidence of non-commercial hydrocarbons.


ExxonMobil is an operator and holds 45% interest in the Stabroek Block. Hess holds 30% and CNOOC has 25%.

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