The drillship Stena DrillMAX. Photo:

ExxonMobil Announces New Discovery Offshore Guyana

Mike Schuler
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June 9, 2021

ExxonMobil announced a new discovery today at the Stabroek Block offshore Guyana.

The “Longtail-3” well was drilled by the Stena DrillMAX drillship in water of more than 6,100 feet deep. The company said drilling encountered 230 feet (70 meters) of net pay, including newly identified and high-quality hydrocarbon bearing reservoirs below the original “Longtail-1” discovery, located about two miles to the north.

Stena DrillMAX is one of two drillships ExxonMobil added to the area in the first quarter of 2021 (the other being the Noble Sam Croft), bringing its total to six drillships now operating in Guyana in support of the company’s 15-well campaign at the Stabroek block.

“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,” said Mike Cousins, senior vice president of exploration and new ventures at ExxonMobil.

Meanwhile, an evaluation well at “Mako-2”, also at Stabroek, has confirmed the extent of the reservoir which Exxon says seems to support the potential fifth floating production storage and offloading (FPSO) vessel in the area east of the “Liza” complex. Drilled in 2015, Liza-1 was first significant oil find offshore Guyana.

ExxonMobil affiliate Esso Exploration and Production Guyana Limited is operator at at the 6.6 million acres Stabroek Block with 45% interest. Hess and CNOOC hold the remaining 30% and 25%, respectively.

ExxonMobil estimates the gross recoverable resource for the Stabroek Block to be more than 8 billion oil equivalent barrels, including Liza and other successful exploration wells on Payara, Liza deep, Snoek, Turbot, Ranger, Pacora, Longtail, Hammerhead, Pluma, Tilapia, Haimara, Yellowtail, Tripletail and Mako.

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