The well has been drilled to a total depth of 4,195m and penetrated around 75m of net pay in a quality reservoir section, noted the company.

The company which, completed drill stem test at Lontra, reveled produced at a stabilized flow rate of 2,500 barrels per day of condensate and 39 million cubic feet per day of gas.

The flow rates at the well, has been restricted by the surface test facilities on the SSV Catarina drilling rig.

To acquire data on the flow capacity and fluid composition, the drill stem test has been conducted in the high liquids content gas interval said the company.

Cobalt International Energy chairman and CEO Joseph Bryant said the company, along with the partners Sonangol P&P and BP are very pleased with the results of Lontra #1 discovery.’

"While further appraisal drilling will be required to determine the ultimate size of the Lontra field, it is clear that Lontra is a discovery on a global scale," Bryant added.

Cobalt has started moving the SSV Catarina rig to drill the Orca #1 Pre-salt exploratory well, situated around 15 miles northeast of Lontra in Block 20, as a result of the temporary abandonment of Lontra #1 well.

The company is the operator of Lontra and Orca wells with 40% working interest, while BP and Sonangol P&P are the other partners in the Block 20, each with a 30% working interest.

Cobalt International Energy chief exploration officer James Farnsworth said the firm has drilled three exploration wells in the Kwanza Pre-salt basin and have made three discoveries.

"Additionally, all of the data that we have collected suggests that the well’s deliverability far exceeds the drill stem test flow rates, which were limited by the surface test equipment," Farnsworth added.