Union Jack Oil plc announced a disappointing update on its Sark well in Central Oklahoma, USA, where it holds a 53% interest. The well, drilled to a Total Depth of 5,391 feet, initially indicated the Prue interval as hydrocarbon bearing. However, a subsequent 30-day production test failed to yield commercial hydrocarbons, with post-well analysis confirming the encountered structural closure was breached. This unexpected result could negatively impact investor sentiment regarding this specific project. Despite this setback, the company highlighted that its other US interests, including income from Moccasin, the Andrews Field, and Mineral Royalties, remain profitable, and it intends to continue its Oklahoma drilling programme.

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."

KeyFacts Energy: Union Jack Oil US company profile