This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Use and Action of Surfactants”.
1. What is an Anionic surfactant?
a) Organic molecules where the water-soluble group is negatively charged
b) Organic molecules where the water-soluble group is positively charged
c) Organic molecules where the water-soluble group can be either positively or negatively charged
d) Organic molecules that do not ionize
View Answer
Explanation: Anionic surfactants are Organic molecules where the water-soluble group is negatively charged. The anionic surfactant is shown on the diagram below in which Part A of the surfactant molecule is known as the Water-soluble Group. The part B of the surfactant molecule is known as Oil soluble Group. And M+ represents a positive ion such as Na+.
2. What is a Cationic surfactant?
a) Organic molecules where the water-soluble group is negatively charged
b) Organic molecules where the water-soluble group is positively charged
c) Organic molecules where the water-soluble group can be either positively or negatively charged
d) Organic molecules that do not ionize
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Explanation: Cationic surfactants are organic molecules where the water-soluble group is positively charged. A surfactant has two parts in it. One part is soluble in oil and another part is soluble in water. The molecule thus is partially soluble in both water and oil.
3. What is Amphoteric surfactant?
a) Organic molecules where the water-soluble group is negatively charged
b) Organic molecules where the water-soluble group is positively charged
c) Organic molecules where the water-soluble group can be either positively, negatively charged or uncharged or uncharged
d) Organic molecules that do not ionize
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Explanation: Amphoteric surfactants are organic molecules where the water-soluble group can be either positively or negatively charged or uncharged. The charge on an Amphoteric surfactant depends on the pH of the system.
4. What is a Non-ionic surfactant?
a) Organic molecules where the water-soluble group is negatively charged
b) Organic molecules where the water-soluble group is positively charged
c) Organic molecules where the water-soluble group can be either positively or negatively charged
d) Organic molecules that do not ionize
View Answer
Explanation: Non-ionic surfactants are Organic molecules that do not ionize. Most Non-ionic surfactants contain water-soluble groups that are polymers of either ethylene oxide or propylene oxide.
5. Which of the following is correct regarding the action of anionic surfactant?
a) Water-wet negatively charged sand, shale or clay
b) Oil wet sand, shale or clay
c) Doesn’t alter the wettability
d) Alter any type of wettability of the rock
View Answer
Explanation: The action of anionic surfactant is that it Water-wet negatively charged sand, shale or clay. Anionic surfactants are Organic molecules where the water-soluble group is negatively charged.
6. Which of the following is correct regarding the action of cationic surfactant?
a) Water-wet negatively charged sand, shale or clay
b) Oil wet sand, shale or clay
c) Doesn’t alter the wettability
d) Alter any type of wettability of the rock
View Answer
Explanation: The action of cationic surfactant is that it Oil wet sand, shale or clay. Cationic surfactants are organic molecules where the water-soluble group is positively charged.
7. Anionic surfactants oil-wet limestone or dolomite up to pH of 8.
a) True
b) False
View Answer
Explanation: The statement is true. Anionic surfactants oil-wet limestone or dolomite up to pH of 8. The action of anionic surfactant is that it Water-wet negatively charged sand, shale or clay. Anionic surfactants are Organic molecules where the water-soluble group is negatively charged.
8. Cationic surfactants water-wet limestone or dolomite up to pH of 4.
a) True
b) False
View Answer
Explanation: The statement is False. The corrected statement is Cationic surfactants water-wet limestone or dolomite up to pH of 8. The action of cationic surfactant is that it Oil wet sand, shale or clay. Cationic surfactants are organic molecules where the water-soluble group is positively charged.
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