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According to “Guide to the expression of uncertainty in measurement” (GUM), which is widely regarded as the international standard for the evaluation of uncertainty, the uncertainty of measurement is: “…non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information

Introduction Production well testing refers to the process of performing periodic measurements of well productivity. Main parameters to be measured are flow rates (oil, gas, and water), pressures and temperatures (downhole and surface), fluid properties (density, shrinkage, SG, composition, etc.). The collected information is then