Water Cut
The percentage of water in the fluids a well produces. Water cut tends to rise over a well's life and drives lifting and disposal costs.
Water cut is the share of water in the total liquid a well produces, stated as a percentage of the combined water and oil. A new well may produce mostly oil with little water, but as the reservoir is drawn down, the water fraction usually climbs — late in life many wells produce far more water than hydrocarbons.
Water cut matters because the water has to be lifted to surface, separated, and disposed of, typically by injection into a saltwater disposal well. Those handling and disposal costs are part of the lease operating expense, and rising water cut is one of the main reasons an aging well eventually reaches its economic limit and is plugged.
For a royalty owner, water cut does not directly reduce your check the way costs hit a working interest, but it signals where a well is in its life. A high and climbing water cut points to maturing production and a shorter remaining runway — useful context when valuing a position.