ExxonMobil’s largest oil project aiming to produce 290k barrels of oil, up to 1.5B cubic feet of gas daily

Mar 12, 2025 News

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…three fields to be developed in 8^th project

By Davina Bagot

Kaieteur News-  ExxonMobil Guyana Limited (EMGL), the operator of the Stabroek Block has submitted a Project Summary to the Environmental Protection Agency (EPA), outlining its plan to develop the resources in Longtail, Tripletail and Turbot as part of its eight project.

In the document seen by this newspaper, the oil giant, which currently has another application pending at the EPA for its seventh project- Hammerhead- explained that the development has an estimated life of 30 years and is expected to come on stream by 2030.

Exxon said, “The Longtail Development Project will develop the Longtail, Tripletail, and Turbot non-associated gas fields, and potentially additional resources, if determined to be feasible and economically viable.”

In the meantime, as a non-associated gas development, the primary produced fluid is non-associated gas, from which condensate will be separated on the Floating Production Storage and Offloading vessel (FPSO), prior to the remaining gas stream being reinjected into the reservoir for pressure maintenance and increased recovery of condensate.

According to the Project Summary, gas may be exported from the Longtail project as demand materializes. Current plans include non-associated gas production of between 1,000 to 1,500 million Standard Cubic Feet (MMscfd) per day of non-associated gas and 200 to 290 thousand barrels of condensate per day. The FPSO will be able to store approximately two million barrels of condensate.

BlackRock Midstream describes condensate as extremely light oil. The Longtail project would be the largest offshore development pursued by the company in Guyana to date. Other oil projects were designed to produce up to 250,000 barrels of oil per day.

Like its other projects, Longtail will involve drilling of production and injection wells, installation, commissioning, and operations of Subsea Umbilicals, Risers, and Flowlines (SURF), and a Floating Production, Storage, and Offloading vessel (FPSO) for handling and offloading of produced hydrocarbons.

The Project will utilise marine support vessels as well as onshore infrastructure, including but not limited to shorebases, warehouses, storage, and pipe yards, fabrication facilities, fuel supply facilities, and waste management facilities in Guyana. Such infrastructure will be used to support the drilling, installation, production, and decommissioning operations of the Longtail Project.

The proposed development is located in the southeastern portion of the Stabroek Block, approximately 200 km from Georgetown and adjacent to previous Stabroek Projects. Exxon has indicated plans to use drill ships to produce the non-associated gas and condensate from approximately 24 – 60 production and injection wells. The subsea equipment will be installed at a depth of approximately 1,600 – 2,000 metres.

The proposed FPSO will be a newly built floating facility with double side and single bottom protection, with approximate dimensions of 334m long by 60 m wide by 32.8 m deep, and will be moored on location, approximately 200 km offshore, some 39 km southeast of the Liza Unity FPSO.

Exxon explained, “Its mooring system will be designed to keep the FPSO on station continuously for the duration of the Project (30 years). Condensate will be stored in the FPSO tanks prior to export to global markets via conventional tankers owned/operated by third parties. At production during Longtail operations, the FPSO may offload condensate to conventional tankers approximately every three to five days.”

About Longtail, Tripletail and Turbot

The Longtail discovery was announced in June 2018. Longtail is ExxonMobil’s eighth oil discovery in the Stabroek Block. The well was drilled in a new reservoir, encountering approximately 256 feet (78 meters) of high-quality, oil-bearing sandstone reservoir. The well was safely drilled to 18,057 feet (5,504 meters) depth in 6,365 feet (1,940 meters) of water. The Tripletail discovery was later announced in September 2019 and is ExxonMobil’s 14th oil discovery. It encountered approximately 108 feet (33 meters) of a high-quality oil bearing sandstone reservoir and was drilled in 6,572 feet (2,003 meters) of water.

Meanwhile, the Turbot discovery was announced in October 2017 as Exxon’s fifth discovery. The company said the Turbot- 1 well was drilled in a new reservoir, encountering 75 feet (23 meters) of high-quality, oil-bearing sandstone reservoir. The well was safely drilled to 18,445 feet (5,622 meters) in 5,912 feet (1,802 meters) of water.

(ExxonMobil’s largest oil project aiming to produce 290k barrels of oil, up to 1.5B cubic feet of gas daily)

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• ExxonMobil, gas, largest, Longtail, project

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