Petroleum Production Operations Interview Questions and Answers on “Formation Damage Susceptible to Surfactant Treatment”.
1. Oil wetting a normally water-wet formation can reduce the permeability by an average of 40%.
a) True
b) False
Answer: d
Clarification: The statement is true. Oil wetting a normally water-wet formation can reduce the permeability by an average of 40%. The range of reduction in permeability is 15 to 85%.
2. Corrosion inhibitors and surfactants are generally cationic surfactants.
a) True
b) False
Answer: c
Clarification: The statement is true. Corrosion inhibitors and surfactants are generally cationic surfactants. This causes the oil-wetting of the surface of the rock that is very unfavorable and reduces the relative permeability.
3. Which of the following is incorrect in the context of surfactant used in the oil and gas industry?
a) Most cationic surfactant oil wet sandstone
b) Most cationic surfactant oil wet sandstone
c) Most cationic surfactant destabilizes water in oil emulsions
d) Organic corrosion inhibitors are usually cationic surfactants
Answer: c
Clarification: The incorrect statement is most cationic surfactant destabilizes water in oil emulsions. The corrected statement is most cationic surfactant stabilizes water in oil emulsions. Most cationic surfactant oil wet sandstone and clays.
4. Emulsion – blocking and water – blocking is usually not a problem in _____ reservoirs except during acidizing.
a) Sandstone
b) Shale
c) Evaporites
d) Limestone and Dolomite
Answer: d
Clarification: Emulsion – blocking and water – blocking is usually not a problem in Limestone and Dolomite reservoirs except during acidizing. Most cationic surfactant oil wet sandstone and clays.
5. Which of the following is incorrect in the context of cationic surfactant used in the oil and gas industry?
a) Most cationic surfactant oil wet sandstone
b) Surfactants should always swell and shrink
c) Most cationic surfactant stabilizes water in oil emulsions
d) Organic corrosion inhibitors are usually cationic surfactants
Answer: b
Clarification: The incorrect among the above options is that Surfactants should always swell and shrink. The corrected statement is that well-treating surfactants should not swell and shrink.
Petroleum Production Operations for Interviews,