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A volumetric oil reservoir has initial pressure 3000 psi and bubble-point pressure 2500 psi. During depletion below bubble point, which mechanism contributes most directly to maintaining reservoir pressure?
A) Rock & connate-water expansion
B) Solution-gas expansion
C) Gas-cap expansion
D) Gravity drainage
💬 Comment your answer: A/B/C/D

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A pressure-derivative plot shows a horizontal derivative followed by an upward trend with approximately unit slope on a log-log plot. This most likely indicates:
A) Infinite-acting radial flow
B) Wellbore storage
C) Linear flow
D) Boundary-dominated flow
💬 Comment your answer: A/B/C/D

A producing well shows:
Reservoir pressure ↓
Water cut ↑
IPR curve shifts downward
VLP curve shifts upward
Which combination best explains the production decline?
A) Increased reservoir pressure + reduced hydrostatic head
B) Reduced reservoir pressure + increased fluid-column hydrostatic head
C) Increased permeability + reduced water cut
D) Reduced water density + increased reservoir pressure
💬 Comment your answer: A/B/C/D

For radial steady-state flow of a slightly compressible liquid, if the wellbore radius is reduced by a factor of 10 while all other parameters remain unchanged, the pressure drawdown required for the same production rate will:
A) Decrease 10×
B) Increase 10×
C) Increase approximately proportional to ln(10)
D) Remain unchanged
💬 Comment your answer: A/B/C/D

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A drilling fluid has density 10.5 ppg. Formation pressure at 10,000 ft TVD is 5,100 psi. Assuming negligible friction and surface pressure, the approximate pressure margin is:
A) 150 psi
B) 360 psi
C) 410 psi
D) 520 psi
💬 Comment your answer: A/B/C/D

If flow rate through a circulation system is doubled and turbulent flow is assumed, frictional pressure loss approximately becomes:
A) 2×
B) 2.5×
C) 4×
D) 8×
💬 Comment your answer: A/B/C/D

For an undersaturated oil reservoir, reservoir pressure is 3000 psi and productivity index is 2 STB/day/psi. What is the production rate at � psi?
A) 500 STB/day
B) 750 STB/day
C) 1000 STB/day
D) 1500 STB/day
💬 Comment your answer: A/B/C/D

At the operating point of a producing well:
A) IPR is always greater than VLP
B) VLP is always greater than IPR
C) IPR and VLP intersect
D) Their slopes must be identical
💬 Comment your answer: A/B/C/D

In a water-wet reservoir, spontaneous imbibition of water into an oil-saturated matrix primarily occurs because of:
A) Viscous forces
B) Gravity forces
C) Capillary forces
D) Compressibility forces
💬 Comment your answer: A/B/C/D

The primary mobility-related benefit of polymer flooding is:
A) Increasing oil API gravity
B) Reducing water viscosity
C) Increasing injected-water viscosity
D) Increasing reservoir permeability
💬 Comment your answer: A/B/C/D

A formation shows:
Low gamma ray
High resistivity
Significant porosity
Large neutron-density separation
The most likely interpretation is:
A) Shale
B) Clean water-bearing sandstone
C) Clean gas-bearing sandstone
D) Tight carbonate
💬 Comment your answer: A/B/C/D

During drilling, mud-pit volume increases and flow continues after pumps are stopped. The most probable immediate interpretation is:
A) Lost circulation
B) Formation influx/kick
C) Differential sticking
D) Bit balling
💬 Comment your answer: A/B/C/D

During drilling, mud-pit volume increases and flow continues after pumps are stopped. The most probable immediate interpretation is:
A) Lost circulation
B) Formation influx/kick
C) Differential sticking
D) Bit balling
💬 Comment your answer: A/B/C/D

Under favorable reservoir conditions, which drive mechanism generally provides the highest ultimate oil recovery?
A) Solution-gas drive
B) Gas-cap drive
C) Strong water drive
D) Rock/fluid expansion
💬 Comment your answer: A/B/C/D

For a volatile oil system, reducing separator pressure at approximately constant temperature generally causes:
A) More gas to remain dissolved
B) More gas to evolve from solution
C) Oil viscosity to become zero
D) Gas density to become zero
💬 Comment your answer: A/B/C/D

Why does Bo exhibit characteristic behavior around the bubble point?
A) Oil becomes completely immobile
B) Maximum dissolved gas is present in oil at bubble point
C) Gas viscosity becomes zero
D) Oil density becomes infinite
💬 Comment your answer: A/B/C/D