Hess increases stake in Kaieteur Block, offshore Guyana 25 May 2021 (Last Updated May 25th, 2021 15:28) Hess Corporation has increased its stake in Kaieteur Block, offshore Guyana, to 20%. Share Article The Tanager-1 well is currently considered to be non-commercial. Credit: Kevin Harris / Unsplash. Hess Corporation has acquired an additional 5% stake in the Kaieteur Block, offshore Guyana, from Cataleya Energy for an undisclosed sum. The transaction increased Hess Corporation’s working interest (WI) from 15% to 20% in the Kaieteur Block. The acquisition follows the oil discovery at the Tanager-1 well, located in Kaieteur Block, in 2020. Following drilling, the Tanager-1 well encountered 16m of net oil pay (20oAPI oil) in high-quality sandstone reservoirs of the Maastrichtian age.