2. A laboratory cell with volume of 0.006769 cu ft contains 0.001944 lb moles of
ID: 480676 • Letter: 2
Question
2. A laboratory cell with volume of 0.006769 cu ft contains 0.001944 lb moles of the mixture given in the table below. Temperature is to be raised to 90°F Component Composition, mole fraction Methane 0.750 Ethane 0.100 Isobutane 0.150 1.000 1) Calculate the pressure to be expected with the Soave-Redlich-Kwong equation of state. Use values of 0.02 for binary interaction coefficient between methane and isobutane, 0.01 between ethane and isobutane, and 0.00 between methane and ethane. Compare your answers with experimental results of 2000 psia t 2%. 2) Repeat 1) with the Peng-Robinson equation of state. Use values of 0.02 for binary interaction coefficient between methane and isobutane, 0.01 between ethane and isobutane, and 0.00 between methane and ethane. 3. The initial reservoir pressure and temperature in the Lower Tuscaloosa reservoir of the East Fork Field were 5043 psig and 263 F. The bubble-point pressure of the 40%API oil plus l 110 scf STB of gas produced from this field was measured as 3460 psig at 263°F. What type of reservoir fluid is in this reservoir? Is the reservoir oil saturated or undersaturated? How do you know? 4. A field in north Louisiana discovered in 1953 and developed by 1956 had an initial producing gas-oil ratio of 2000 scfSTB 1) The stock-tank liquid was "medium orange" and had a gravity of 51.2°API. Classify this reservoir fluid. 2) During the producing history of the field, the stock-tank liquid gravity steadily increased to 63 API, and the producing gas-oil ratio increased to a maximum of 29,000 scfSTB Does this information confirm your classification? Why or why not?Explanation / Answer
he initial reservoir pressure and temperature in the Lower Tuscaloosareservoir of the East Fork Field were 5,043 psig and 263oF. The bubble-point pressure of the40oAPI oil plus 1,110 scf/STB of gas produced from this field was measured as 3,460 psig at263oAPI. What type of reservoir fluid is in this reservoir? Is the reservoir oil saturated orundersaturated? How do you know?
Answer:
Since oil gravity is 40oAPI and producing gas-oil ratio is 1,110 scf/STB < 2,000scf/STB,
this fluid is a Black Oil.
Since the initial reservoir pressure = 5,043 psig is higher than the bubble-point pressure = 3,460 psig, this is an Undersaturated Black Oil reservoirwith no free gas or gas cap
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A field in north Louisiana discovered in 1953 and developed by 1956 had aninitial producing gas-oil ratio of 2000 scf/STB.The stock-tank liquid was“medium orange” and had a gravity of 51.2oAPI.Classify this reservoir fluid.
Answer
Volatile Oi
GOR = 2000 scf/STB
oAPI = > 40
Color: orange
During the producing history of the field in Exercise 5-6 the stock-tank liquidgravity steadily increased to 63oAPI, and the producing gas-oil ratio increased toa maximum of 29,000 scf/STB.Does this information confirm yourclassification?Why or why not?
Answer :
Yes,
volatile oil
.Increase ino API from 51.2 to 63
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