What is the primary function of a packer in a production well completion string?


A.
To measure continuous downhole multi-phase flow rates

B.
To increase bottomhole reservoir pressure artificially

C.
To isolate the annulus from the production tubing and protect the casing from high pressures and corrosive fluids

D.
To filter out sand grains entering the wellbore

Which enhanced oil recovery (EOR) method primarily relies on lowering interfacial tension (IFT) to near-zero values to mobilize trapped residual oil?


A.
Cyclic steam stimulation

B.
Waterflooding

C.
In-situ combustion

D.
Surfactant flooding

When designing hydraulic fracturing treatments, what parameter dictates the width of the created hydraulic fracture under plane-strain assumptions?


A.
Proppant density and specific gravity exclusively

B.
Fluid filtration rate alone independent of rock mechanics

C.
Drill string rotation speed and mud weight window

D.
Net pressure (p−σ
h
​
) and formation elastic properties (Young's modulus E, Poisson's ratio ν)

You open a gas well's choke wider and the wellhead temperature rises. Why?
A) Joule-Thomson heating at the choke
B) Higher rate carries more reservoir heat up the tubing
C) Gas composition changes
D) Pressure increases upstream

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In gas reservoir engineering, what is the purpose of utilizing real gas pseudopressure (m(p)) instead of standard pressure (p) when analyzing gas well test data?


A.
To account for the pressure dependency of gas viscosity and gas compressibility factor (z)

B.
To simplify calculations assuming ideal gas behavior at high pressures

C.
To eliminate the need for skin factor corrections

D.
To convert dry gas metrics directly into black oil volumetric equivalents

Why is the pore pressure and fracture gradient window narrow in deepwater?
A) Seawater has high density
B) Formations are always overpressured
C) Seawater replaces rock in the overburden, lowering fracture gradient
D) Mud weight is always too low

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Core porosity is 20% but density log reads 28%. A valid non-tool-failure reason is:
A) Wrong matrix density assumed in the log
B) Core is always more accurate
C) Log measures permeability
D) Mud filtrate has no effect

A well flows naturally, yet the operator adds gas lift. The most likely reason is:
A) To increase reservoir pressure
B) To raise oil viscosity
C) To lighten the fluid column and increase drawdown and rate
D) To reduce GOR

Pr = 3000 psi, Pb = 2500 psi, J = 2 stb/d/psi, Pwf = 1500 psi. Total rate using the Vogel combined IPR is closest to:
A) 1000 stb/d
B) 1644 stb/d
C) 2644 stb/d
D) 3500 stb/d

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Which well is more sensitive to tubing size?
A) Dry gas well
B) High-GOR oil well, because tubing size affects both friction and hydrostatic gradient
C) Both equally
D) Neither

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Below bubble point, a well's PI falls though absolute permeability is unchanged. Why?
A) Rock compaction
B) Increased oil viscosity at surface
C) Gas saturation rises, reducing oil relative permeability
D) Tubing friction increases

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An abandoned oil well is being evaluated for geothermal energy recovery. Which parameter is most critical when assessing its thermal potential?
A. Historical oil API gravity alone
B. Formation temperature and sustainable heat extraction rate
C. Original drilling mud colour
D. Historical water cut alone

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A machine-learning model predicts bottom-hole pressure using historical production data. However, its predictions violate mass conservation under certain operating conditions. Which approach is most suitable to overcome this limitation?

A. Increase the number of hidden layers
B. Use Physics-Informed Neural Networks (PINNs)
C. Increase the training dataset without constraints
D. Apply conventional linear regression

During CO₂ injection into a depleted oil reservoir, which condition is most important for achieving miscible displacement?
A. Reservoir pressure exceeds the minimum miscibility pressure (MMP)
B. Reservoir temperature is below the critical temperature of CO₂
C. CO₂ density becomes zero
D. Reservoir pressure falls below bubble-point pressure