Xcite sold information on the Bentley heavy oil field to an undisclosed party for £9.8m in the second quarter of the year.
A further £656,000 could be paid if the purchaser meets regulatory milestones.
Xcite, which holds and operates 100% of the field, boosted its coffers further in the first half with the sale of surplus oil field equipment for £1.6m, following the extended pre-production well test in the field.
Data collected from the test has led the company to revise upwards its calculation on the field's proven and probable resources (2P), from 116 million stock barrels of oil (MMstb) in February 2012 to 250 MMstb in April this year.
Based on the assessment it has estimated generating revenue of $28.2 billion (£18.4bn) over the life of the field, equal to a weighted price of $113 per barrel.
Xcite reported that talks are continuing with potential farm-out partners as it looks to bring the field into production, having previously stating it hopes to do so in the latter half of 2015, and with lenders to assist the field's development.
The first half saw the company submit an environmental statement to the Department of Energy and Climate change relating to the field development plan for public consultation. It also entered into a memorandum of understanding with engineering and project management specialist AMEC Group to support the Bentley field's development.
Shares closed down 0.50p at 104.5p.