![]() ![]() ![]() At this point, the pressure and the oil and gas volumes in the cell are measured. Up until the bubble-point pressure is reached, all measurements have been single-phase (liquid hydrocarbon) measurements.Īfter the bubble-point pressure has been reached, the volume is increased further until a significant volume of free gas has developed (Step 4). This pressure is the bubble-point pressure of the crude oil. This process is continued for several pressure steps until the first bubble of gas (red) is observed through a window in the cell (Step 3). At Step 2, the pressure in the cell will be less that the original pressure due to the expansion of the crude oil. The volume of the cell is then increased by extending the piston outward (Step 2), and the pressure and volume are recorded. ![]() In a differential liberation test, a crude oil sample (green) is introduced into the cell at the initial reservoir pressure and temperature (Step 1 in Figure 3.07). ![]()
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