Union Jack Oil, a UK and USA focused onshore hydrocarbon, production, development, exploration and investment company, has announced that, further to the Company's announcement of 24 September 2025, the Company has provided an update on the Sark well, located in Central Oklahoma, USA. Union Jack holds a 53% interest in Sark.
Sark was drilled to a Total Depth of 5,391 feet and the Prue interval was highlighted on electric logs as hydrocarbon bearing following evaluation.
Temporary production facilities were installed and a 30-day test programme was undertaken. The production test of the Prue Sandstone failed to produce commercial hydrocarbons.
Post well analysis indicates the Sark well encountered a valid structural closure, however, the trap was subsequently breached.
David Bramhill, Executive Chairman of Union Jack, commented: 'Following the drilling of four successful discoveries in Oklahoma to date, this is an unexpected and disappointing result. Our US interests, with income from Moccasin, the Andrews Field and Mineral Royalties, continue to be profitable and we look forward to continuing our Oklahoma drilling programme.'
Source: Union Jack Oil
