Chevron has discovered oil at an appraisal well at its Anchor prospect in the deepwater Gulf of Mexico, according to partner Cobalt International.
Map of Anchor, from Chevron.
The Anchor #4 appraisal well was drilled to total depth and encountered approximately 800ft of net oil pay in multiple inboard Lower Tertiary reservoirs, says Cobalt.
The original Anchor discovery well is in Green Canyon Block 807, approximately 140mi (225km) off the coast of Louisiana in 5180ft (1579m) water depth.
In June 2015, Chevron spudded an appraisal well that encountered 694ft (211m) of net oil pay in October.
In January 2015, the Anchor well No. 2 encountered high quality oil pay in multiple Lower Tertiary Wilcox Sands.
In August 2014, Chevron quit the Anchor-1 well due to mechanical difficulties during tieback operations which prevented further progress, leading us to safely plug and abandon the well.
Chevron subsidiary Chevron USA Inc. is the operator of the Anchor prospect with 55% interest. Its partners include Cobalt International Energy (20%), Samson Offshore Anchor (12.5%), and Venari Resources (12.5%).
Cobalt also owns a 100% working interest in two leases on the south flank of Anchor, but outside of the Anchor unit. The Anchor reservoir extends onto these leases and reservoir simulation suggests that additional wells on these two leases are required to maximize recovery from the field.
“Cobalt has engaged with the operator [Chevron] and the Bureau of Safety and Environmental Enforcement regarding options to bring these two leases into the Anchor unit in order to optimize the development of the field,” Cobalt says.