This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Acids used in Well Stimulation”.
1. What is acid stimulation?
a) Treatment of a reservoir formation with fluid containing acid
b) Treatment of production tubing with a fluid containing acid
c) Treatment of a reservoir formation with fluid containing base
d) Treatment of a reservoir formation with a fluid containing the only surfactant
View Answer
Explanation: Acid stimulation is the treatment of a reservoir formation with fluid containing acid. In sandstone formations, the acid reacts with soluble substances of the formation matrix and in carbonate formations, the acid dissolves the entire matrix.
2. What is Matrix Acidizing?
a) Treatment of a reservoir formation with fluid containing a surfactant
b) When the injection pressure is more than the fracture pressure
c) Treatment of a reservoir formation with fluid containing base
d) When the injection pressure is less than the fracture pressure
View Answer
Explanation: Matrix Acidizing is the type of acidizing in which the injection pressure is less than fracture pressure. Acid stimulation is the treatment of a reservoir formation with fluid containing acid in the oil and gas industry.
3. What is Fracture Acidizing?
a) Treatment of a reservoir formation with fluid containing a surfactant
b) When the injection pressure is more than the fracture pressure
c) Treatment of a reservoir formation with fluid containing base
d) When the injection pressure is less than the fracture pressure
View Answer
Explanation: Fracture Acidizing is the type of acidizing in which the injection pressure is more than fracture pressure. Acid stimulation is the treatment of a reservoir formation with fluid containing acid in the oil and gas industry.
4. Fracture Acidizing has no application in sandstone wells.
a) True
b) False
View Answer
Explanation: The statement is true. Fracture Acidizing has no application in sandstone wells. In the upstream oil industry, Fracture Acidizing is the type of acidizing in which the injection pressure is more than fracture pressure.
5. Hydrochloric acid is normally used in the field at 40% by weight.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is Hydrochloric acid is normally used in the field at 15% by weight; however, the concentration of the HCl acid may vary between 5% and 35%.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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