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Subject: a factor of 2x of the true value gen. Целиком предложение выглядит так, в нем все понятно, но этот 2х и ~20% of the true value портят всю картину. The level of accuracy for the determination of in situ live or dead oil viscosity must be much better than a factor of 2x of the true value to make reliable well placement decisions in the field or to detect fluid flow barriers by using steps in viscosity profiles (generally less sensitive than using chemical compositional data) and needs to be typically better than about ±20% of the true value to make decisions regarding cold versus thermal production in very heavy oils or oil sand bitumen reservoirs.
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