This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Reservoir Drive Mechanisms”.
1. Which of the following provides energy for the compaction drive reservoir?
a) Contraction of connate water and expansion of pore volume
b) Expansion of oil
c) Expansion of gas
d) Reduction of pore volume and expansion of connate water
View Answer
Explanation: The reduction of pore volume and expansion of connate water provides energy for the compaction drive reservoir. This drive mechanism is common in highly compressible and unconsolidated reservoirs.
2. What is the full form of STOOIP?
a) Stock tank oil originally in place
b) Stock tank original oil in place
c) Surface tank original oil in place
d) Stock tank original oil in place
View Answer
Explanation: The full form of STOOIP is Stock tank original oil in place. The amount of oil present in the reservoir prior to production is termed as STOOIP. Before starting any type of activity to the virgin reservoir the geologists and petroleum engineers should have quality information about the amount of oil present there in the reservoir.
3. What is Effective porosity?
a) It is that Porosity when the pores are interconnected
b) It is that Porosity when the pores are not connected
c) Porosity arises after the deposition of the sediments
d) Porosity arises before the deposition of the sediments
View Answer
Explanation: Effective porosity is that Porosity when the pores are interconnected and provide microchannels for the fluid to flow through it. Secondary porosity is that porosity which arises after the sediment was deposited and the porosity which arises before the sediment was deposited.
4. Which of the following is correct for the “Black Oil” reservoir?
a) Reservoir pressure = Bubble point pressure
b) Reservoir pressure > Bubble point pressure
c) Reservoir pressure < Dew point pressure
d) Reservoir pressure = Dew point pressure
View Answer
Explanation: For a “Black Oil” reservoir the Reservoir pressure is greater than the Bubble point pressure which lies on the top left corner region of P-T envelope above the Bubble point curve.
5. The reservoir drive mechanism is called a Solution gas drive reservoir when the ____
a) Reservoir pressure < Bubble point reservoir
b) Reservoir pressure > Bubble point reservoir
c) Reservoir pressure > Dew point reservoir
d) Reservoir pressure = Dew point reservoir
View Answer
Explanation: The reservoir drive mechanism is called a Solution gas drive reservoir when the Reservoir pressure < Bubble point reservoir. This reservoir lies inside the P-T envelope and which lies below the bubble point curve.
6. Which of the following is correct for the Solution gas drive reservoir?
a)
b)
c) 
d)
View Answer
Explanation: When the pressure is below the bubble point pressure then the Gas Oil ration is constant but as soon as the pressure reaches the bubble point pressure the gas bubbles start to come out of the solution but it won’t move until it reaches the critical gas saturation so the GOR seems to come down and move up for a little time but after that the GOR increases and then finally comes down as all of the gases are already produced along with the oil.
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