The second well drilled to confirm the Tupi Northeast presalt oil discovery in the Santos basin offshore Brazil has identified an oil column more than 290 m thick in carbonate reservoirs, said Petroleo Brasileiro SA.
Wireline samples detected 26° gravity oil at 4,960 m at the 1-BRSA-976-RJS (1-RJS-691) well in 2,131 m of water northeast of Lula field and 255 km off the city of Rio de Janeiro. The first confirmation well was 3-BRSA-944-RJS (3-RJS-688A) in the Franco area.
The well is being cased across the carbonate reservoirs, after which drilling will continue in order to fully penetrate the reservoirs and locate an oil-water contact, Petrobras said. Then formation tests will be performed.
About the Author
Alan Petzet
Chief Editor Exploration
Alan Petzet is Chief Editor-Exploration of Oil & Gas Journal in Houston. He is editor of the Weekly E&D Newsletter, emailed to OGJ subscribers, and a regular contributor to the OGJ Online subscriber website.
Petzet joined OGJ in 1981 after 13 years in the Tulsa World business-oil department. He was named OGJ Exploration Editor in 1990. A native of Tulsa, he has a BA in journalism from the University of Tulsa.