A DL test is carried out on a crude oil sample taken from an oil field in Alaska

Question

A DL test is carried out on a crude oil sample taken from an oil field in Alaska. The sample, with a volume of 310 cc, is placed in a PVT cell at its bubble- point pressure of 3015 psia and reservoir temperature of 185degreeF. At isothermal conditions of 185degreeF, the cell pressure is reduced to 2500 psia by backward piston movement, resulting in the total volume of the hydrocarbon system of 348.7 cc. The gas is displaced at constant pressure (by forward piston movement) and found to occupy a volume of 0.150 scf. The oil volume shrinks to 291.0 cc. The DL step is repeated at 2000 psia and the remaining oil is flashed through a series of laboratory separators. From the collected experimental data given in the following table, calculate the solution gas-oil ratio at 3015, 2500, and 2000 psia:

Explanation / Answer

answer- given volume of sample V= 310cc and bubble point pressure Pb = 3015 psia

the reservoir temperature is about 185 farenheit =358.15K

at 3015 psai bubble point the gas oil ratio is about 565.3 in scf/STB

at 2500 psia the gas oil ratio will be 468.7 in scf/STB

at 2000 psia the oil gas ratio will be 375 in scf/STB

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