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q g = surface gas rate, Mscf/D p w = BHFP at surface datum, psia

Gas Tubing VFP Equation. q g = surface gas rate, Mscf/D p w = BHFP at surface datum, psia p t = tubing flowing pressure, psia S = gas static pressure term T a = average tubing temperature, o R Z a = average Z-factor D = tubing diameter, in H = true vertical height, ft

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q g = surface gas rate, Mscf/D p w = BHFP at surface datum, psia

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  1. Gas Tubing VFP Equation qg = surface gas rate, Mscf/D pw = BHFP at surface datum, psia pt = tubing flowing pressure, psia S= gas static pressure term Ta = average tubing temperature, oR Za = average Z-factor D = tubing diameter, in H = true vertical height, ft g = gas specific gravity, air=1 a1,a2,a3 = numerical (unit-related) constants, which for the units above are: a1 = 31.62 , a2 = 0.0375 , a3 = 0.10797

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