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Oil company Union Jack Oil said there had been 'highly encouraging progress at the Wressle development in North Lincolnshire, of which it had a 40% stake.
Instantaneous flow rates from the Ashover Grit reservoir of 884 barrels of oil per day were achieved on a significantly restricted choke setting with high wellhead flowing pressure, the company said.
It added that 480,000 cubic feet of gas was produced per day, or around 80 barrels of oil equivalent per day, plus in excess of 950 barrels of oil equivalent per day achieved.
The flow potential of Wressle remained to be fully tested, Union Jack said.