250+ TOP MCQs on Paraffins & Asphaltenes – Preventing or Decreasing Wax Deposition and Answers

Petroleum Production Operations Multiple Choice Questions on “Paraffins & Asphaltenes – Preventing or Decreasing Wax Deposition”.

1. Why plastic coated pipes or plastic pipes are used in the petroleum industry?
a) To prevent wax deposition
b) To set the packer in place
c) To start the production at early stages
d) To prevent H₂S production
Answer: a
Clarification: Plastic coated pipes or plastic pipes are used in the petroleum industry to prevent wax or paraffin deposition and at the same to prevent corrosion. The deposition °F wax in plastic or plastic coated pipes is much slower.

2. What is the maximum allowable temperature °F hot oils in epoxy coated pipes?
a) 250°F
b) 150°F
c) 350°F
d) 450°F
View Answer

Answer: b
Clarification: The maximum allowable temperature °F hot oils in epoxy coated pipes is 150°F. Hot Oil Circulation is a method °F removal °F wax. Wax deposition has negative effects on the flow characteristics °F the oil.

3. What is the maximum allowable temperature °F hot oils in pipes with Phenolic coatings?
a) 250°F
b) 150°F
c) 300°F
d) 450°F
Answer: c
Clarification: The maximum allowable temperature °F hot oils in pipes with Phenolic coatings is 300°F. Hot Oil Circulation is a method °F removal °F wax Pipes with Phenolic coatings that will not get damaged with temperature up to 300°F.

4. Hot oiling will damage PVC pipes.
a) True
b) False
Answer: a
Clarification: The statement is true. Hot oiling will damage PVC pipes. Hot oiling fiberglass-reinforced plastic may blow the plastic apart from the joints. So, considerable care must be taken while using PVC pipes.

5. If the flowing temperature is maintained above the cloud point then wax deposition will not occur.
a) True
b) False
Answer: a
Clarification: The statement is true. Wax deposition mainly occurs due to the temperature difference. If the flowing temperature is maintained above the cloud point then wax deposition will not occur. A higher flow rate prevents precipitation and deposition °F wax due to the shear action °F the wax near the surface.

6. What is a Down-hole heater?
a) Packer setting equipment
b) Heaters used in the separator
c) Heaters used in ESP
d) Used to raise the crude temperature
Answer: d
Clarification: Down-hole heaters are the heaters used to raise the crude temperature. If the crude is maintained above the cloud point then wax deposition will not occur. These Down-hole heaters are mainly used to prevent the deposition °F the paraffin and wax.