The initial daily production from a gas-condensate reservoir is 186 bbl of conde
ID: 911424 • Letter: T
Question
The initial daily production from a gas-condensate reservoir is 186 bbl of condensate, 3750 MSCF of high pressure gas, and 95 MSCF 0f stock tank gas. The tank oil has a gravity of 51.2 ° API at 60 ° F. The specific gravity of the separator is 0.712 and of the stock tank gas, 1.30. The initial reservoir pressure is 3480 psia and reservoir temperature is 220 ° F. Average hydrocarbon porosity is 17.2 per cent . Assume standard condition of 14.7 psia and 60 ° F.
(a) What is the average gravity of the produced gases?
(b) What is the initial gas oil ratio?
(c) Estimate the molecular weight of the condensate?
(d) calculate the specific gravity (air = 1.00) of the total well production.
(e) calculate the gas deviation factor of the initial reservoir fluid (vapor) at initial reservoir pressure.
(f) calculate the initial moles in place per acre-foot.
(g) calculate the mole fraction that is gas in initial reservoir fluid.
(h) calculate the initial (sals) gas and condensate in place per acre-foot.
Explanation / Answer
a) The average gravity:
AG = 95*1.3 + 3750*1.3 / (3750 + 95)
AG = 0.7265
b) Innitial gas oil ratio:
GOR = (95+3750) * 1000 / 186
GOR = 20672 SCF/bbl
c) Molecular Weight:
MM = 6084 / API - 5.9
MM = 6084 / 51.2 - 5.9
MM = 134.3
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