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Golden Gate said the well, spudded on April 28, is now expected to take 75 days to drill to total depth of 14,200 feet.
Drilling to total depth was originally planned to take only four weeks.
The company said an intermediate liner was set at 10,877ft instead of 12,100ft to prevent the loss of circulation, which could have caused potential problems while drilling.
According to the company, the liner has been successfully tested at the necessary mud weight pressure and the well is drilling ahead into the objective section below the geopressure transition zone.
Jumonville-1 is expected to test the secondary objective reservoirs in the Marg Vag and Camerina intervals before reaching the primary objective Miogyp sand.
Once the Miogyp sand is tested, casing string will be set in order to test the deeper objectives of the Cib Haz.
The Bullseye prospect has a target reservoir potential of 12.5 million barrels of oil and 33 billion cubic feet of gas.
If Jumonville-1 is successful, several follow-up drill targets have been identified, the company said.
Participants in the Jumonville-1 well are Golden Gate Petroleum (43.33%), Modena Resources (15%), Pantheon Resources PLC (15%), Eastern Advisors (20%) and Nuenco (6.67%).