Rate vs. time
Outcomes
Each outcome is run to its own economic limit, then probability-weighted. Weighting the outcomes, not averaging the rates first, keeps the economic limit honest.
The cleanout
How to read it
A PV/I below 1.0 means the well does not return its capital at the discount rate. Volumes that depend on a cleanout succeeding carry that probability; a tail with a 65% chance of being recovered is hard to call reasonably certain. Replace every risk input with your own field's cleanout, fill and tag history.