ExxonMobil Announces New Discovery at Longtail-3 Offshore Guyana

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ExxonMobil says it made a discovery at Longtail-3 in the Stabroek Block offshore Guyana. Drilling at Longtail-3 encountered 230 feet (70 meters) of net pay, including newly identified, high-quality hydrocarbon-bearing reservoirs below the original Longtail-1 discovery intervals.

The well is located approximately two miles (3.5 kilometers) south of the Longtail-1 well. It was drilled in more than 6,100 feet (1860 meters) of water by the Stena DrillMAX.

  • Two drillships added in first quarter 2021; six drillships now operating offshore Guyana
  • Additional drilling activity to support Stabroek development
  • More than 2,600 Guyanese supporting overall activities

“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. “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.”

The Longtail-1 discovery in the Stabroek Block was drilled in 2018, encountering approximately 256 feet (78 meters) of high-quality, oil-bearing sandstone reservoirs.

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ExxonMobil has deployed two additional drillships in the first quarter of 2021; the Stena 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.

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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 support 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.

By the first quarter of this year, more than 2,600 Guyanese and 600 local suppliers were supporting ExxonMobil’s activities in-country. Guyanese staff has completed more than 40,000 hours of training in Guyana, Trinidad and Tobago, and the United States.

The Stabroek Block is 6.6 million acres (26,800 square kilometers). ExxonMobil affiliate Esso Exploration and Production Guyana Limited is the operator and holds 45 percent interest in the Stabroek Block. Hess Guyana Exploration Ltd. holds 30 percent interest and CNOOC Petroleum Guyana Limited, a wholly-owned subsidiary of CNOOC Limited, holds 25 percent interest.

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