# Petroleum Production Operations Questions and Answers – Effects of Reservoir Characteristics on Well Completions

This set of Petroleum Production Operations Questions and Answers for Entrance exams focuses on “Effects of Reservoir Characteristics on Well Completions”.

1. Which of the following Gas solubility vs pressure plot is correct?
a)
b)
c)
d)

Explanation: Gas Solubility remains constant when the pressure is more than the bubble point pressure but as soon as the pressure reaches the bubble point pressure and then to the lower value of pressure, the Gas solubility decreases.

2. What is a Gas drive reservoir?
a) Works on the principle of Gas cap expansion above the oil zone
b) Works on the principle of Water below the oil zone
c) Works on the principle of Oil expansion
d) Liberation of gas from gas dissolved in the crude

Explanation: A Gas drive reservoir is a reservoir in which the expansion of the gas (above oil zone) takes place. This gas pressure can be used to recover oil. When the gas expands then it pushes the oil below it and if we perforate in the oil zone then a good amount of oil can be recovered depending on the reservoir potential.

3. For a solution gas drive reservoir, the pressure declines rapidly as compare to other types of reservoirs.
a) True
b) False

Explanation: Yes this is true. The reservoir pressure declines rapidly in case of solution gas or depletion drive reservoir. The preferable drive mechanism is in the order of water drive > Gas Cap drive > Solution gas drive

4. What is an undersaturated reservoir?
a) When the initial reservoir pressure is more than the bubble point pressure
b) When the initial reservoir pressure is less than the bubble point pressure
c) When the initial reservoir pressure is equal to the bubble point pressure
d) When the initial reservoir pressure is less than the dew point pressure

Explanation: An undersaturated reservoir is a reservoir when the initial reservoir pressure is more than the bubble point pressure. Then gases may be dissolved in the solution. But when produced then if the reservoir pressure declines below the bubble point pressure then gases come out of the solution.

5. A gas cap drive reservoir in thin sand with a high angle of dip is likely to be more efficiently controlled by having completion irregularly but lower on the structure.
a) True
b) False

Explanation: Yes, a gas cap drive reservoir in thin sand with a high angle of dip is likely to be more efficiently controlled by having completion irregularly but lower on the structure. Because of the higher angle of dip too many completions may cause a problem if it is regular. As too many completion will cause perforation near the Gas Oil contact.
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6. What should be the production rate to get high ultimate recovery from a reservoir?
a) Maximum
b) Minimum
c) Constant
d) Optimum

Explanation: The production rate should be Optimum to get high ultimate recovery from a reservoir. If the production rate is high then there is a chance of losing the natural drive energy so if the natural drive energy diminishes earlier then the oil recovery factor will be low and it won’t able to produce a good amount of oil.

Sanfoundry Global Education & Learning Series – Petroleum Production Operations.