Union Jack Oil plc announced, further to the RNS published on 8 April 2024, a positive update in respect of the Andrews 1-17 well, drilled to test the West Bowlegs Prospect, located in Seminole County, Oklahoma, United States. Union Jack holds a 45% working interest in this well, including an associated area on the licence. The primary target for the Andrews 1-17 well, the Hunton Limestone ("Hunton"), one of the main hydrocarbon reservoirs in Oklahoma, was penetrated at approximately 4,200 feet, showing high porosity, elevated gas readings, with good reservoir quality being interpreted on the wireline logs.

The total depth of the Andrews 1-17 well was 4,600 feet. The Hunton is unconformably overlain by the main oil-prone source rock, the Woodford Shale and is in an excellent position for the migration of oil. Testing of the Andrews 1-17 well is ongoing and further announcements will be made in the coming weeks after the well has cleaned-up and oil and gas production rates are optimised, following the installation of permanent production facilities.

Union Jack has now earned its 45% working interest across the associated licence area and going forward will only pay its working interest share of any future drilling and development costs.