Highlights
Q1:
Six months ago, you completed the first well in a newly-discovered reservoir whose initial pressure was 3150 psig. The well produces 40.3°API oil and 0.756 specific gravity gas. The well’s producing gas-oil ratio (Rp) is 1000 SCF/STB, which has remained constant.
Estimate the reservoir-oil’s bubble-point pressure given that the reservoir temperature is 205°F.
Q2:
Estimate and plot the solution gas-oil ratio of the reservoir oil of Q1. Start at a pressure of 3I50 psig and decrease the pressure in 500 psi steps to a final pressure of 150 psig.
Q3:
A well has just been completed in a newly-discovered black-oil reservoir. Reservoir pressure appears to be above the bubble-point pressure of the oil. Measured at reservoir conditions, 86.3 barrels per day enter the wellbore. The oil is processed through a separator into a stock tank. The stock tank accumulates 57.9 STBs of 44.2°API oil each day. The separator produces 43,150 SCF/d of 0.724 gravity gas, and the stock tank vents 7240 SCF/d of 1.332 gravity gas.
What is the formation volume factor of the oil?
What is the solution gas-oil ratio?
Which of the previous answers applies at the bubble point?
Q4:
Two STBs of a Saudi Arabian oil (33 ºAPI) are placed in a tank with 1400 SCF of gas (0.68 gravity). The tank’s temperature is then raised to 195 ºF. You then start increasing the tank’s pressure by injecting mercury into it.
at what pressure will all the gas disappear?
what will the oil volume be at that pressure?
What will the oil volume be if you raise the pressure by 500 psi above the pressure in (a)?
If you then inject 560 SCF of a gas (0.75 gravity) into the tank at (c) keeping the pressure constant, will you have any free gas in the tank?
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