This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Paraffins & Asphaltenes – Deposition Mechanisms”.
1. The increase in temperature is probably the most common cause of wax deposition.
a) True
b) False
View Answer
Explanation: The given statement is False. The corrected statement is temperature reduction is probably the most common cause of wax deposition. The reason being the wax solubility decreases as the temperature of the wax is lowered.
2. Asphaltene deposition is an electrical phenomenon.
a) True
b) False
View Answer
Explanation: The statement is correct. Asphaltene deposition is an electrical phenomenon. Katz and Beu conducted an experiment based on which it was proved that the deposition of Asphaltene is an electrical phenomenon.
3. Which of the following statement is incorrect regarding the waxes and asphaltenes regarding their different types of phenomenon in deposition?
a) High cloud point crudes form stable emulsions
b) Waxes are high MW alkanes present in crude that crystallize when cooled below the cloud point
c) Waxes are water wet
d) Asphaltene deposition is an electrical phenomenon
View Answer
Explanation: The statement Waxes are water wet is incorrect. The corrected statement is Waxes are Oil wet. So when the waxes move along with the oil then due to cohesive force the movement of the crude will face viscous nature.
4. Which of the following statement is incorrect regarding the Wax and Asphaletens?
a) Waxes are soluble in oil
b) Waxy emulsions are more likely at lower temp
c) Wettability is the degree of the solid to be wetted by oil or water when both are present
d) Asphaltenes exist as colloidal suspension (1nm – 1000nm) and are not stabilized by resins
View Answer
Explanation: The statement “Asphaltenes exist as colloidal suspension (1nm – 1000nm) and are not stabilized by resins” is incorrect. It is incorrect because as per the statement Asphaltenes are not stabilized by resins which are incorrect. The corrected statement is asphaltenes exist as colloidal suspension (1nm – 1000nm) and are stabilized by resins.
5. Which of the following statement is incorrect regarding the paraffin and wax depositions?
a) Temperature reduction is the cause of wax deposition
b) High gas-oil ration magnifies the paraffin deposition problems
c) Paraffin deposition is not affected by changes in the water-oil ratio
d) Fluids flow through porous media can develop an electrical charge through the steaming potential phenomenon
View Answer
Explanation: The statement “Paraffin deposition is not affected by changes in water-oil ratio” is incorrect. It is incorrect because as per the statement Paraffin depositions are independent of water-oil ratio which is incorrect. The corrected statement is “Paraffin deposition may get affected by changes in water-oil ratio”. However, the primary effect is related to the changes in the rate of production along with the water-oil ratio.
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