US supermajor ExxonMobil has begun drilling a new appraisal well at the Ranger discovery in the Stabroek Block offshore Guyana, aiming to assess additional volumes in an area known for its high-potential carbonate reservoirs.
Simultaneously, the company is preparing to spud another appraisal well at the Barreleye discovery, aiming to further evaluate its commercial potential as part of its broader development strategy in the Stabroek Block.
This update was provided on Monday by President of ExxonMobil Guyana Alistair Routledge during a press conference on Monday.
“We’ve recently completed the Barreleye-2 well which enabled us to go in and we ran a drill stem test…that’s given us data that we are now working our way through. We anticipate actually coming back to the Barreleye reservoirs and doing further tests – Barreleye 3 – either later this year or going into early next year,” Routledge said.
Following the initial Barreleye-1 discovery in 2022, ExxonMobil has conducted further drilling and appraisal activities, including a recent appraisal at Barreleye-2, to evaluate the full resource potential. The Barreleye-1 well had encountered approximately 230 feet (70 meters) of hydrocarbon-bearing sandstone and was drilled in 3,840 feet (1,170 meters) of water.
Meanwhile, with regards to the Ranger discovery, Routledge said the Stena Carron drill ship is currently on that reservoir.
“We’re drilling the Ranger-3 well and then we’re going to run a drill stem test and also stimulate the reservoir to see whether we can economically produce it,” he noted.
Reports indicate that the activity began on September 8, and is scheduled to conclude on December 31, 2025.
The Ranger discovery was made in 2018; the discovery is unique because it is located in a carbonate reservoir, a different type of rock formation compared to previous sandstone discoveries. The Ranger- 1 well was drilled in a new reservoir, encountering approximately 230 feet (70 meters) of high-quality, oil-bearing carbonate reservoir.
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