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

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Gas lift primarily increases production by:
A) Increasing reservoir permeability
B) Increasing oil viscosity
C) Reducing average density of the fluid column
D) Increasing formation pressure
💬 Comment your answer: A/B/C/D

For a favorable immiscible displacement, the mobility ratio M should generally be:
A) M>1
B) M=1only
C) M<1
D) M=0
💬 Comment your answer: A/B/C/D

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An ESP produces significantly less head than expected despite correct rotational speed. The most likely cause is:
A) Free gas interference at pump intake
B) Increased reservoir permeability
C) Reduced water cut
D) Higher oil API gravity
💬 Comment your answer: A/B/C/D

A sandstone well has low productivity because of near-wellbore formation damage caused by fines. The most appropriate approach is generally:
A) Hydraulic fracturing only
B) Acid treatment appropriate to the damage mechanism
C) Gas lift
D) Water injection
💬 Comment your answer: A/B/C/D

A positive skin factor � indicates:
A) Formation stimulation
B) Near-wellbore damage
C) Infinite permeability
D) Zero pressure drop
💬 Comment your answer: A/B/C/D

For immiscible water flooding, increasing the viscosity of injected water while keeping oil properties unchanged generally:
A) Increases mobility ratio
B) Decreases mobility ratio
C) Has no effect
D) Makes relative permeability equal to 1
💬 Comment your answer: A/B/C/D

During circulation, bottom-hole pressure is greater than static hydrostatic pressure primarily because of:
A) Formation temperature
B) Annular frictional pressure loss
C) Drillstring weight
D) Bit rotation
💬 Comment your answer: A/B/C/D

For gas material-balance calculations, which quantity is commonly used to account for gas compressibility?
A) p
B) p/z
C) z
D) zp
💬 Comment your answer: A/B/C/D