This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Prevention of Well Damage”.
1. Acetic acid is strongly ionized.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is Acetic acid is weakly ionized. Acetic acid is a slow reacting organic acid. It is relatively easy to inhibit against in corrosion which otherwise can damage severely.
2. Formic acid is weakly ionized.
a) True
b) False
View Answer
Explanation: The statement is true. It is a type of weak acid having some properties resembling to that of the acetic acid. But at higher temperatures the formic acid seems to be more active than expected. It is used for well treatment in petroleum industry.
3. What is the percentage of Hydrofluoric acid generally used in well treatment?
a) 5%
b) 8%
c) 3%
d) 0.2%
View Answer
Explanation: The percentage of Hydrofluoric acid generally used in well treatment is 3% in oil, gas or service wells. Hydrochloric acid is also used along with Hydrofluoric acid with a percentage of 12 in general.
4. Sulfamic acid reacts as ___ as HCl.
a) Slow
b) 25% of the rate
c) 70% of the rate
d) Fast
View Answer
Explanation: Sulfamic acid reacts as fast as HCl. The main advantage of the Sulfamic acid is that it can be hauled to the location as a dry powder and then, later on, it is mixed with water at the time of treatment to be initiated.
5. Which of the following is correct about Fluoboric acid?
a) It is an inorganic acid
b) At equilibrium, only 15% of the acid is hydrolyzed
c) It is hydrolyzed to generate Acetic acid
d) At equilibrium, only 50% of the acid is hydrolyzed
View Answer
Explanation: The corrected statement is that Fluoboric acid is an inorganic acid. At equilibrium, only 5% of the acid is hydrolyzed and only this much amount is available to react with the clay minerals. It is hydrolyzed to generate Hydrofluoric acid.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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