The effect of pressure on various properties of black oil is shown in the figure. The bubble point pressure is \( P_b \).
Which of the following option(s) is/are CORRECT?
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The behavior of oil properties such as gas-oil ratio, viscosity, and formation volume factor can be predicted based on the effect of pressure. Typically, gas-oil ratio decreases with pressure, viscosity increases, and formation volume factor increases as gas is released from solution.
Let's analyze the curves shown in the figure:
- Curve 1: The solution gas-oil ratio (GOR) typically increases as pressure decreases. This curve represents a typical GOR behavior, where the ratio decreases sharply as pressure approaches the bubble point pressure, and then stabilizes.
- Curve 2: This curve represents the viscosity of the oil. As pressure increases, the oil viscosity generally increases because the gas dissolved in the oil tends to reduce viscosity. This behavior is represented by curve 2.
- Curve 3: The oil formation volume factor (FVF) increases with a decrease in pressure as more gas is released from the solution, causing the volume to increase. This curve represents oil formation volume factor behavior, where the volume factor rises as the pressure decreases until the bubble point.
The correct answers are:
- (A) Curve 1 represents solution gas-oil ratio.
- (D) Curve 3 represents oil density.
