Premier Oil has announced that production from its North Sea Catcher field has reached over 1 million barrels since first oil was struck.
London-headquartered Premier also announced that the second cargo shipment of 515 thousand barrels of oil was successfully completed on Sunday.
The flagship project, which sits around 108 miles off the coast of Aberdeen, started production just before Christmas last year.
The FPSO is expected to produce around 60,000 barrels of oil per day in the first half of 2018.
Catcher is in block 29/9a in water depths of around 90 m (295 ft).
At the time of first oil, chief executive Tony Durrant said: “Catcher is an example of Premier Oil’s capability to deliver full cycle FPSO projects from exploration through to production.
“As production ramps up in the first half of 2018, the increased cash flows will play an important role in Premier’s plans for debt reduction.
“The Catcher Area project also demonstrates Premier’s continuing commitment to invest in the UK.”