Ann: Hickory-1 Upper SFS Zone Flows Light Oil, page-63

FYI

“Throughout the flow back period, oil cuts increased as the well cleaned up, reaching a maximum of 15% oil cut at the end of the test program.”

This means that during the flow back period, the proportion of oil in the fluid being produced increased over time. Initially, when the well started producing, there may have been a higher proportion of water or other fluids mixed with the oil. As the production continued and the well "cleaned up" (meaning it expelled more of the initial fluids and debris), the oil cut, which is the percentage of oil in the total fluid produced, gradually increased. Eventually, at the end of the test program, the oil cut reached its maximum value of 15%, indicating that 15% of the total fluid produced was oil.