Trinity said the B11 sidetrack well drilled from the Trintes Bravo platform has been brought onstream at an initial gross production rate of 265 bopd.
The rig will now be demobilised to the yard to upgrade the mud systems and drilling will recommence later in the year.
Current group production is now c. 4,000 boepd (net).
CEO Joel Pemberton said: "Initial production rates from the B11 well demonstrate the Trintes reservoir ability to deliver. The upgrade plan to our rig over the next two months will significantly improve drilling efficiency and we look forward to recommencing our infill drilling programme on Trintes in November 2013."
At 8:53am: (LON:TRIN) share price was -0.5p at 102p