Page 43, Problem 5.12. A water-drive reservoir with "unexpected early breakthrough." The solution in the margin — not the printed one, but handwritten in red pen — read: "Check the aquifer influence function. Van Everdingen-Hurst is ideal, but only if the aquifer is infinite. For a limited aquifer, try the Fetkovich method. But the real trick? Re-examine your original water saturation. Is it truly irreducible, or is mobile water moving?"
At 2:47 AM, the simulation finished. The water cut curve matched the historical data with a correlation coefficient of 0.998. It was beautiful. It was truth. applied petroleum reservoir engineering solution manual
Always sanity-check the manual’s final answer with a quick order-of-magnitude estimate. If a manual says a reservoir will produce 10,000 STB/day from a 10-acre well, you should be suspicious. Page 43, Problem 5