This set of Petroleum Production Operations Questions & Answers for Exams focuses on “Acidizing Techniques for Carbonate Formations”.
1. As temperature increases, the acid spends faster on carbonates.
a) True
b) False
View Answer
Explanation: The statement is true. As temperature increases, the acid spends faster on carbonates. It is often necessary to increase the pumping rate during acid fracturing to place the acid in place properly before it is spent.
2. What is the optimum pressure up to which there exists a sharp increase in HCl spending time on carbonate acidizing?
a) 100 psi
b) 200 psi
c) 400 psi
d) 500 psi
View Answer
Explanation: The optimum pressure up to which there exists a sharp increase in HCl spending time on carbonate acidizing is 500 psi. Beyond this pressure, only a little increase in pressure can be expected.
3. As the concentration of HCl increases, the spending time on the formation decreases.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is as the concentration of HCl increases, the spending time on the formation increases. The higher strength of acid dissolves a larger fraction of carbonates.
4. At low and moderate temperatures, what is the reaction rate of dolomite as compared to limestone?
a) ratelimestone < 2.ratedolomite
b) ratelimestone > 3.ratedolomite
c) ratelimestone > 2.ratedolomite
d) ratelimestone < 2.ratedolomite
View Answer
Explanation: At low and moderate temperatures, the reaction rate of dolomite as compared to limestone follows the relation ratelimestone > 2.ratedolomite. i.e. the reaction rate of limestone is more than twice that of dolomite.
5. Which of the following is incorrect regarding emulsified acids?
a) Used to increase the production rate
b) Mainly used in Sandstone reservoirs
c) Used to emulsify the aqueous acid with oil
d) Used in Matrix acidizing and Acid fracturing
View Answer
Explanation: The incorrect statement from the above-mentioned choices is that “Mainly used in Sandstone reservoirs”. The corrected statement is that “Mainly used in Carbonate reservoirs”. Emulsified acids are used to increase the production rate of the carbonate reservoirs.
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