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reviewer Flashcards

1
Q
  1. In reservoir engineering, steady state flow refers to a condition where:

a. The reservoir pressure remains constant over time.
b. The flow rate of fluids within the reservoir fluctuates.
c. The production rate matches the reservoir recharge rate.
d. There is no fluid flow occurring within the reservoir.

A

a

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2
Q
  1. Which of the following statements is true regarding steady state flow in reservoir engineering?

a. Steady state flow is a transient flow condition.
b. Steady state flow occurs when the production rate matches the reservoir recharge rate.
c. Steady state flow is characterized by a constant production rate throughout the life of the
reservoir.
d. Steady state flow can only occur in homogeneous reservoirs.

A

b

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3
Q
  1. Which of the following factors can disrupt steady state flow in a reservoir?

a. Changes in reservoir temperature.
b. Fluctuations in oil composition.
c. Variation in fluid viscosity…
d. Alterations in reservoir

A

d

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4
Q
  1. Steady state flow is an idealized concept used in reservoir engineering because:

a. It accurately represents all real-life reservoir behavior.
b. It simplifies the analysis of fluid flow behavior in complex reservoirs.
c. It ensures maximum recovery of hydrocarbons from the reservoir.
d. It eliminates the need for well testing and monitoring.

A

b

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5
Q
  1. Unsteady state flow is commonly observed during which stage of reservoir production?

a. Initial production.
b. Steady-state production.
c. Enhanced oil recovery.
d. Abandonment phase.

A

a

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5
Q
  1. What is the primary characteristic of unsteady state flow in reservoir engineering?

a. Constant pressure throughout the reservoir.
b. Varying pressure with time in the reservoir.
c. Constant temperature throughout the reservoir.
d. Varying temperature with time in the reservoir.

A

b

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5
Q
  1. Which of the following statements is true regarding steady state flow in reservoir engineering?

a. Steady state flow occurs when the reservoir pressure remains constant over time.
b. Steady state flow is characterized by a constant production rate throughout the life of the
reservoir.
c. Steady state flow occurs when the production rate matches the reservoir recharge rate.
d. Steady state flow is a transient flow condition that only occurs during the initial production
phase.

A

b

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6
Q

7.During unsteady state flow, pressure changes in the reservoir can be influenced by which of
the following factors?

a. Fluid composition.
b. Reservoir permeability.
c. Wellbore geometry.
d. All of the above.

A

d

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7
Q
  1. Which of the following statements is true regarding unsteady state flow in reservoir
    engineering?

a. It occurs only in naturally fractured reservoirs.
b. It is a result of equilibrium between fluid phases in the reservoir.
c. It requires constant injection of fluid into the reservoir.
d. It can lead to pressure propagation within the reservoir.

A

d

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7
Q
  1. During unsteady state flow, which of the following is NOT typically considered?

a. Pressure changes over time.
b. Fluid flow rates in the reservoir.
c. Temperature variations within the reservoir.
d. Fluid composition change

A

c

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7
Q
  1. Which of the following is true about pseudo-steady state flow?

a. It occurs when the reservoir pressure remains constant over time.
b. It occurs when the reservoir is depleted and no more fluid can be produced.
c. It occurs when the flow rate remains constant over time.
d. It occurs when the reservoir rock is impermeable.

A

c

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7
Q
  1. Pseudo-steady state flow is a concept used to describe which of the following conditions in
    reservoir engineering?

a. Transient flow
b. Steady-state flow
c. Radial flow
d. Turbulent flow

A

c

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7
Q
  1. In pseudo-steady state flow, which parameter is assumed to remain constant?

a. Flow rate
b. Pressure gradient
c. Permeability
d. Porosity

A

b

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7
Q
  1. Which of the following conditions is required for pseudo-steady state flow to be applicable?

a. Low reservoir permeability
b. High reservoir porosity
c. Constant flow rate
d. Unconsolidated reservoir rock

A

c

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7
Q
  1. The correct sequence of steps for analyzing pseudo-steady state flow in reservoir
    engineering is:

a. Estimate permeability, calculate flow rate, determine pressure drop.
b. Calculate pressure drop, estimate permeability, determine flow rate.
c. Determine flow rate, estimate permeability, calculate pressure drop.
d. Determine pressure drop, estimate permeability, calculate flow rate.

A

c

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8
Q
  1. The diffusivity equation is used to model the flow of fluids in a reservoir based on which
    principle?

a. Darcy’s law
b. Bernoulli’s principle
c. Stokes law
d. Pascal’s law

A

a

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9
Q
  1. Which term in the diffusivity equation represents the pressure gradient in a reservoir?

a. Transmissibility
b. Permeability
c. Porosity
d. Compressibility

A

a

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9
Q
  1. What is the unit of transmissibility?
    a. Darcy
    b. Millidarcy
    c. Darcy-meter
    d. Darcy-day
A

c

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9
Q
  1. Which factor affects the transmissibility of a reservoir?

a. Viscosity
b. Temperature
c. Fluid density
d. Permeability

A

d

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10
Q
  1. In the diffusivity equation, what does the term ‘A’ represent?

a. Cross-sectional area
b. Flow rate
c. Reservoir thickness
d. Compressibility factor

A

a

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11
Q
  1. According to the continuity equation, the rate of mass flow through a pipe is equal to:

a.The product of the cross-sectional area and the velocity of the fluid
b. The product of the pressure and the velocity of the fluid
c. The product of the density and the velocity of the fluid
d. The product of the viscosity and the velocity of the fluid

A

a

12
Q
  1. The continuity equation is based on the principle of:

a. Conservation of momentum
b. Conservation of energy
c. Conservation of mass
d. Conservation of volume

A

c

13
Q
  1. Which equation represents the general form of the oil material balance equation?

a. Arps’ equation
b. Darcy’s equation
c. The diffusivity equation
d. The material balance equation

A

d

13
Q
  1. If the cross-sectional area of a pipe decreases, according to the continuity equation, what
    happens to the fluid velocity?

a. It decreases
b. It increases
c. It remains constant
d. It depends on the fluid’s density

A

b

13
Q
  1. For incompressible flow, the continuity equation can be expressed as:

a. Mass flow rate = Cross-sectional area x Velocity
b. Mass flow rate = Density × Cross-sectional area x Velocity
c. Mass flow rate - Pressure × Velocity
d. Mass flow rate = Density × Velocity

A

a

13
Q
  1. In a steady-state flow, the continuity equation simplifies to:

a. Mass flow rate = Cross-sectional area × Velocity
b. Mass flow rate = Density × Cross-sectional area × Velocity
c. Mass flow rate = Pressure x Velocity
d. Mass flow rate = Density × Velocity

A

d

14
Q
  1. What is the primary purpose of the oil material balance equation?

a. To calculate the formation volume factor
b. To determine the water saturation in the reservoir
c. To estimate the initial oil in place
d. To evaluate the rock permeability

A

c

14
Q
  1. Which factor is typically assumed to be constant in the oil material balance equation?

a. Reservoir temperature
b. Fluid viscosity
c. Formation permeability
d. Reservoir pressure

A

d

15
Q
  1. Which parameter is often used to estimate the original oil in place in the oil material balance
    equation?

a. Cumulative water production
b. Gas-oil ratio
c. Reservoir porosity
d. Reservoir pressure

A

b

15
Q
  1. What does the term “formation volume factor” represent in the oil material balance
    equation?

a. The volume change of oil due to compressibility effects
b. The ratio of the oil volume at reservoir conditions to surface conditions
c. The ratio of the water volume to the oil volume in the reservoir
d. The change in oil saturation over time

A

b

15
Q
  1. Which equation is commonly used to account for water influx in the oil material balance
    equation?

a. The water saturation equation
b. The water influx equation
c. The aquifer influx equation
d. The formation volume factor equation

A

c

15
Q
  1. Which term represents the cumulative produced oil in the oil material balance equation?

a. Reservoir voidage
b. Reservoir compressibility
c. Reservoir permeability
d. Cumulative water influx

A

a

16
Q
  1. Which factor is often neglected in the oil material sc balance equation for reservoirs with no
    gas cap?

a. Rock compressibility
b. Water saturation
c. Rock permeability
d. Gas expansion factor

A

d

17
Q
  1. What is the significance of the “cumulative water influx” term in the oil material balance
    equation?

a. It represents the amount of water produced from the reservoir
b. It accounts for the water that enters the reservoir from an adjacent aquifer
c. It measures the water saturation in the reservoir
d. It represents the change in water-oil contact over time

A

b

18
Q
  1. Which equation is commonly used to estimate the original oil in place in the oil material
    balance equation for reservoirs with strong water drive?

a. The water-oil ratio equation
b. The aquifer strength equation
c. The water encroachment equation
d. The P/Z plot equation

A

c

19
Q
  1. Which parameter is NOT required for the application of the gas material balance equation?

a. Initial gas in place (GIIP)
b. Reservoir pressure
c. Formation volume factor (Bo)
d. Permeability

A

d

20
Q
  1. The gas material balance equation is primarily used to determine:

a. Reservoir permeability
b. Reservoir pressure
c. Reservoir temperature
d. Reservoir porosity

A

b

21
Q
  1. Which statement is TRUE regarding the gas material balance equation?

a. It assumes constant reservoir temperature.
b. It is only applicable to oil reservoirs.
c. It does not consider the effect of gas compressibility.
d. It is used to estimate the oil saturation in a reservoir.

A

a

22
Q
  1. In the gas material balance equation, the term “P/Z” represents:

a. Gas formation volume factor
b. Reservoir porosity
c. Gas compressibility factor
d. Reservoir thickness

A

c

23
Q
  1. When applying the gas material balance equation, a decline in reservoir pressure indicates:

a. An increase in gas saturation
b. An increase in gas production rate
c. A decrease in gas saturation
d. A decrease in reservoir thickness

A

c

23
Q
  1. What is the primary mechanism of water influx in an oil reservoir?

a. Capillary pressure
b. Gravity drainage
c. Aquifer influx
d. Relative permeability

A

c

24
Q
  1. What is the typical behavior of water influx in a solution-gas-drive reservoir?

a. Continuous water influx throughout the production life
b. No water influx until the reservoir pressure drops below the aquifer pressure
c. Initial water influx followed by a decline
d. Water influx only during drilling and completion operations

A

b

25
Q
  1. Which factor does NOT influence water influx into a reservoir?

a. Aquifer size and properties
b. Permeability of the reservoir rock
c. Oil viscosity
d. Reservoir pressure

A

d

26
Q
  1. Which statement is true regarding water influx control methods?

a. Water influx control is always achieved by reducing the reservoir permeability.
b. Water influx control methods primarily target increasing oil recovery.
c. Mechanical barriers can be used to prevent water influx into the reservoir.
d. Water influx control is not economically viable.

A

c

26
Q
  1. What is the term used to describe the situation when the reservoir pressure exceeds the
    aquifer pressure, causing water to flow from the reservoir into the aquifer?

a. Water encroachment
b. Aquifer influx
c. Water coning
d. Reservoir depletion

A

b

27
Q
  1. In immiscible fluid displacement, the capillary number is a dimensionless number that
    represents the ratio of:

a. Viscous forces to gravitational forces
b. Viscous forces to capillary forces
c. Capillary forces to gravitational forces
d. Capillary forces to viscous forces

A

b

27
Q
  1. Which of the following factors does NOT influence immiscible fluid displacement in a
    reservoir?

a. Capillary pressure
b. Permeability contrast
c. Viscosity ratio
d. Porosity

A

d

28
Q
  1. During immiscible fluid displacement, a high capillary number (Ca) indicates:

a. Favorable displacement conditions
b. Unfavorable displacement conditions
c. High reservoir pressure
d. High viscosity ratio

A

a

29
Q
  1. Which of the following statements about the Buckley-Leverett theory for immiscible fluid
    displacement is correct?

a. It assumes gravity effects are negligible
b. It is based on the concept of fractional flow
c. It is only applicable to waterflooding processes
d. It ignores the impact of capillary pressure

A

b

30
Q
  1. Which of the following factors is most likely to lead to fingering or channeling during
    immiscible fluid displacement?

a. High viscosity ratio
b. Low permeability contrast
c. Low interfacial tension
d. Low capillary number

A

a

RES ENG (6 decks)

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