The well was drilled in March and was initially completed for gas flows, but, was subsequently recompleted in an oil reservoir.
It is now flowing oil and Mosman highlighted that more than 535 barrels of crude have so far been sold. Average production over the past seven days was measured at 63.5 barrels of oil per day. Production rates are yet to fully settle, Mosman noted.
"The flow rates from Stanley-2 are satisfying and fully justify the investment in the Stanley project," said John Barr, Mosman chairman.
"With oil production now established from multiple zones this demonstrates the potentially successful long-term nature of the Stanley Field overall.
He added: "The company continues to meet its objectives, and very much looks forward to the next wells being drilled shortly."
The Stanley-3 well is expected to be drilled in August, while the Falcon-1 well is also scheduled for the current quarter.
The company owns an 18.5% interest in the project.