Question:
The liquid shrinkage curves for different types of crude oil are shown in the following figure.
The liquid shrinkage curves for different types of crude oil are shown in the following figure.
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Black oil contains moderate dissolved gas, so its shrinkage curve lies between heavy oil and volatile oil shrinkage characteristics.
Updated On: Dec 2, 2025
- I
- II
- III
- IV
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The Correct Option is B
Solution and Explanation
Different types of crude oils exhibit different shrinkage behavior when pressure decreases. Shrinkage curves show how the liquid volume of crude oil changes as pressure reduces from reservoir conditions to surface conditions.
Black Oil is a crude oil type that contains significant dissolved gas, but not as much as volatile oil or gas-condensate. Because of this, Black Oil experiences a moderate level of shrinkage as pressure decreases.
Curve I shows very high shrinkage—this is typical for volatile oil or condensate, not Black Oil.
Curve IV shows very low shrinkage—typical for heavy oil with negligible dissolved gas.
Curve III shows behavior between volatile oil and Black Oil but still higher shrinkage than expected for Black Oil.
Curve II shows moderate shrinkage consistent with typical Black Oil characteristics.
Hence, Curve II matches the shrinkage profile of Black Oil.
Curve I shows very high shrinkage—this is typical for volatile oil or condensate, not Black Oil.
Curve IV shows very low shrinkage—typical for heavy oil with negligible dissolved gas.
Curve III shows behavior between volatile oil and Black Oil but still higher shrinkage than expected for Black Oil.
Curve II shows moderate shrinkage consistent with typical Black Oil characteristics.
Hence, Curve II matches the shrinkage profile of Black Oil.
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