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A well test at the Kangaroo prospect. Image courtesy of Karoon Gas.

Pacific Rubiales Energy said Monday initial well tests confirmed a “significant discovery” at its Kangaroo shallow water prospect in the Santos Basin, Brazil.

The Kangaroo-2 appraisal well was drilled in Block S-M-1165, about 943 feet up-dip from the Kangaroo-1 discovery well.

The well confirmed a 820 foot gross oil column in Cretaceous and Paleocene aged reservoirs in the structure.

Production testing was conducted over a 36 hour flow period across an initial 89 foot lower interval in the target reservoir.

A maximum oil flow rate of 3,360 barrels per day was achieved through a 44/64 inch choke with a flowing tubing pressure of 690 psi and a gas-oil-ratio of 620 cubic feet per barrel.

Following a 57 hour shut-in pressure build-up period, a second test was conducted with an additional 131 feet opened to flow.

In the second test, a maximum flow of 3,700 bpd, 38 degree API oil was attained through a one inch choke with no CO2, H2S, sand or water produced over a 12 hour test period.

A third test of intervals higher in the reservoir is expected to commence within the next seven days.

A decision on a potential side-track program will be made following the completion of testing in the well bore.

“We are very pleased with the flow results of the first test interval in the Kangaroo-2 appraisal well, which confirms the significant discovery status of the Kangaroo prospect on our blocks in the offshore Santos Basin, in Brazil,” Pacific Rubiales Energy CEO Ronald Pantin.

Ontario-based Pacific Rubiales Energy holds a 35 percent stake in the prospect.

Australia-based Karoon Gas holds a 60 percent operating stake.

Karoon is currently evaluating commercial options and early production strategies for the Kangaroo structure.