Problem 10. Material balance equations are used to derive indices to compare the relative strengths of drive mechanisms. The statement regarding these indices most FALSE is:
(A) Drive indices definitions are subjective and arbitrary.
(B) Water drive indices must use...
(C) The Sills drive indices attempted to define the source...
(D) When comparing Pirson and Sills drive indices...
The solution to this problem (or any indices problem you will likely see) are found on 13 RES 5 of the Guidebook, where I source both Slider and Towler. The key point? If (A) is true, this makes (B) obviously false; how can one thing be "subjective and arbitrary" yet require something else?
Towler explains this well in SPE TS8 P48. Having read quite a few reservoir texts over the years, be warned that while SPE TS8 is not popular it is the "official" SPE reservoir reference, so it's good to know for these kinds of tricky word problems. However, now extra resources are not allowed it's important to learn the material rather than just locate it for future use.
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