Union Jack Oil公司报告称，位于俄克拉荷马州中部的Sark油井在对Prue砂岩层进行为期30天的生产测试后，并未产出具有商业价值的油气。该井钻探至总深度5391英尺，电测井数据显示，在测试前该层存在含油气层段。

为了评估普鲁层段，安装了临时生产设施，但测试结果证实其产量不具备商业可行性。井后分析表明，该层段存在一个有效的构造封闭层，但后来被破坏。

Union Jack持有Sark油井53%的股份。

Union Jack Oil reported that the Sark well in central Oklahoma did not yield commercial hydrocarbons following a 30-day production test of the Prue Sandstone. The well was drilled to a total depth of 5,391 ft, with electric logs indicating hydrocarbon-bearing intervals prior to testing.

Temporary production facilities were installed to evaluate the Prue interval, but testing results confirmed that flow rates were not commercially viable. Post-well analysis indicated the presence of a valid structural closure that was later breached.

Union Jack holds a 53% interest in the Sark well.