HW 3 - PGE 312 Physical and Chemical Behavior of Fluids...

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PGE 312 Physical and Chemical Behavior of Fluids Home Work 3 – Petroleum Fluids Solution Problem 5-1 a. The following graph plots the conditions of the reservoir for mixture 2 of ethane- heptane. The reservoir temperature is greater than the circondentherm of the mixture. The separator conditions lie outside the two - phase envelop of the mixture. The reservoir fluid type is Dry Gas.

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b. The following graph plots the conditions of the reservoir for mixture 3 of ethane- heptane. The reservoir temperature is greater than the circondentherm of the mixture. The separator conditions lie within the two – phase envelop of the mixture. The reservoir fluid type is Wet Gas.
c. The following graph plots the reservoir conditions for mixture 4 of ethane-heptane. The reservoir temperature lies between the critical temperature and the circondentherm of the mixture. The separator conditions lie within the phase envelop of the mixture. The reservoir fluid type is Retrograde Condensate Gas .

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d. The following graph plots the reservoir conditions for mixture 5 of ethane-heptane. The reservoir temperature is slightly less than the critical temperature of the mixture. The separator conditions lie within the two-phase envelop of the mixture. The reservoir fluid type is Volatile oil.
e. The following graph plots the reservoir conditions for mixture 6 of ethane-heptane. The reservoir temperature is very much less than the critical temperature of the mixture. The separator conditions lie within the two - phase envelop of the mixture. The reservoir fluid type is Black Oil .

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Problem 5-2 A) Brazos County’s Buda Field Production of Oil per day = 10 barrels Production of gas per day = 50, 000 scf The initial producing gas-oil ratio = 50000 10 = 5000 ?±² ?³° A general rule of thumb is that a rich retrograde gas would have producing gas-oil ratio in the range of 3300 – 5000 ?±² ?³° . Thus, our conclusion is that the reservoir fluid type is: Retrograde Gas. It would be useful to know the Stock tank gravity (40° - 60° API) and the color of the
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HW 3 - PGE 312 Physical and Chemical Behavior of Fluids...

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