Mayan Energy said production has been restored at the Forest Hill project in Texas, with an initial flow rate of 21 barrels of oil per day.
Production stimulation was expected to deliver sustainable production of over 50 bopd, it added.
An additional two wells are to be brought back on stream by the end of November 2017.
"We now have the assets in place to begin to deliver on our objective of 300 to 500 net bopd to Mayan," managing director Eddie Gonzalez said.
At 9:16am: (LON:MYN) Mayan Energy Limited Ord Npv Di share price was +0.02p at 0.32p