A single well is drilled in a small isolated volumetric oil reservoir with a total compressibility factor 0.00002 1/psi and an oil FVF of 1.3 bbl/STB.
The well flows at 100 BOPD until pseudosteady-state flow is reached and maintained until BHP falls 125 psi over 4 days. The reservoir volume is closest to (Mrb): (A) 420; (B) 320; (C) 220; (D) 120.
This is plug-and-chug using 12 WLT 3: -0.234qB/(ct dpwf/dt) = 0.234(100)1.3 / (2E-5(125/4*24), which at 5.615 cf/bbl converts to 208 Mrb, or (C).
Just be careful with the units, and know the provided CBT reference locations for unit lookup.
I think it should be 208,034 bbls or 208 Mbbls. But answer is still C
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