API- Ace Petroleum Engineering

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

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

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

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

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

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

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

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

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

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

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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

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

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

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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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