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Post: Graduate Trainee (E1 Level)
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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