ExxonMobil Makes New Discovery Offshore Guyana, Considers Fifth FPSO

The latest success for the ExxonMobil-led consortium is also adding drillships to support a 15-well campaign in the Stabroek Block.

The Noble Sam Croft drillship.
Source: Noble Corporation.

ExxonMobil and Hess Corp. announced today their latest discovery offshore Guyana with the Longtail-3 well that is in the massive Stabroek Block.

A net pay of 230 ft (70 m) was reported within hydrocarbon bearing reservoirs that are below the first intervals discovered by the Longtail-1 well drilled in 2018 about 2 miles to the south. The new discovery was drilled in a water depth of about 6,100 ft.

Texas-based ExxonMobil said it added two drillships to its Guyana operations, bringing the total to six. The newly arrived assets are the Stena DrillMAX and the Noble Sam Croft which are now part of a 15-well drilling program in the Stabroek Block.

ExxonMobil also reported that an appraisal well, the Mako-2, has confirmed the quality of another reservoir in the block. This well and the successful Uaru-2 discovery announced in April have prompted the operator to consider deploying what would be its fifth floating, production, storage, and offloading (FPSO) unit to the region.

The string of success for ExxonMobil and its partner Hess has not gone unbroken, however, as the companies report that the Koebi-1 exploration well did not encounter commercial volumes of oil and gas.

ExxonMobil holds a 45% operating interest in the 6.6-million-acre Stabroek Block. Hess owns a 30% stake in the offshore area while the remaining share is held by CNOOC.