Rock and Fluid Properties - Reservoir Engineering - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2016

A core, with a length of 10 cm, breadth of 4 cm and width of 4 cm, weighs 282.4 g in its dry form. The core is then saturated 100% with brine of density 1.1 g/cm³. The brine saturated core weighs 300 g.
The porosity of this core sample is __________ %.

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2

2016 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2016

The porosities of cubic and hexagonal packings, respectively, are

A

47.6% and 25.9%.

B

39.5% and 29.5%.

C

47.6% and 39.5%.

D

39.5% and 25.9%.

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3

2016 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2016

A Differential Liberation Experiment (DLE) and a Constant Composition Expansion (CCE)/Flash liberation experiment were performed in a laboratory for a crude oil to find the formation volume factor (Bo) and the dissolved gas oil ratio (Rs). The pressure stages for both experiments were kept the same. At a pressure less than the bubble point pressure of the crude oil, which of the following statements is TRUE?

A

B_o(CCE) > B_o(DLE), R_s(CCE) > R_s(DLE)

B

B_o(CCE) > B_o(DLE), R_s(CCE) < R_s(DLE)

C

B_o(CCE) < B_o(DLE), R_s(CCE) > R_s(DLE)

D

B_o(CCE) < B_o(DLE), R_s(CCE) < R_s(DLE)

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4

2016 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2016

Brine is used to measure the absolute permeability of a core plug. The rock sample is 4 cm long and its cross-sectional area is 4 cm². The brine has a viscosity of 2 cp and is flowing at a constant rate of 0.5 cm³/s under a 4 atm pressure differential.
The absolute permeability is _____ Darcy.

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5

2016 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2016

During a production test in an oil reservoir, the oil production rate is 200 STB/day. The producing gas oil ratio (GOR) is 800 SCF/STB and dissolved GOR is 200 SCF/STB. The formation volume factor of gas is 0.01 ft³/SCF and the formation volume factor of oil is 1.2 reservoir-bbl/STB.
The down-hole GOR is ___________ ft³/reservoir-bbl.

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6

2017 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2017

The °API of a crude oil of density 950 kg/m³ is ________. (write answer with two decimal places)

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7

2017 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2017

The figure below shows the pressure measured in a well at different depths. AB is gas cap, B is gas oil contact and C is water-oil contact. Density of gas in gas cap is 2 kg/m³, oil density is 800 kg/m³ and water density is 1000 kg/m³. The difference between pressure at point D and point B (P_D – P_B) is ______ × 10⁵ N/m². (use g = 9.81 m/s², write answer with one decimal place)

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8

2017 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2017

A laboratory air-brine capillary pressure of \(1.20 \times 10^5\) N/m² has been measured in a reservoir core sample at residual water saturation. The air-brine surface tension is 0.070 N/m, and the brine-oil interfacial tension for the reservoir fluid is 0.025 N/m. The density values of brine and oil are 1080 kg/m³ and 780 kg/m³, respectively. Take g = 9.81 m/s², and assume identical wetting preferences for the core sample and reservoir. The height of the water-oil transition zone (up to the point of reservoir where connate water saturation is reached) from the free water level is ______ meters. (write answer with two decimal places)

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9

2017 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2017

A porous medium is blended with three types of sediment fractions, fine pebble gravel with porosity (\(\phi_{pebble}\) = 38%), sand (\(\phi_{sand}\) = 32%) and fine sand (\(\phi_{fine sand}\) = 30%). The three sediments are mixed in such proportions that the sand fills the pore volume of fine pebbles completely, and the fine sand fills the pore volume of sand completely. The total porosity of such an irregular system is ______%. (write answer with two decimal places)

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10

2017 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2017

The viscosity - shear rate curve for a fluid is shown in the following plot. Which one of the following options best describes the behavior of the fluid in the regions I, II, and III, respectively?

A

Newtonian, Shear thinning, Shear thickening

B

Shear thinning, Newtonian, Shear thickening

C

Shear thickening, Newtonian, Shear thinning

D

Shear thinning, Shear thickening, Newtonian

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11

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

A phase diagram of a black oil is shown in the figure (Y is the critical point).
Match the following:
(P) Curve XY                                     (I) Dew point curve
(Q) Curve YZ                                     (II) Single phase liquid
(R) Phase I                                       (III) Bubble point curve
(S) Phase II                                     (IV) Single phase gas

A

P-I, Q-III, R-II, S-IV

B

P-III, Q-I, R-II, S-IV

C

P-III, Q-I, R-IV, S-II

D

P-I, Q-II, R-III, S-IV

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12

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

Which one of the following curves represents behavior of oil phase viscosity as a function of pressure in the reservoir (where, \(P_b\) is the bubble point pressure of oil)?

A

Curve I

B

Curve II

C

Curve III

D

Curve IV

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13

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

Which one of the following options presents the correct combination?

A

P-II, Q-III, R-I, S-IV

B

P-IV, Q-I, R-III, S-II

C

P-III, Q-IV, R-I, S-II

D

P-I, Q-III, R-IV, S-II

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14

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

Relative permeability curve for the two rock types (X: solid line and Y: dashed line) are shown in the diagram, where \(S_w\) is the fractional water saturation. Which one of the following statements is correct about wettability and consolidated nature of the two rock types?

A

X is more consolidated and mixed wet, Y is less consolidated and water wet

B

X is more consolidated and water wet, Y is less consolidated and mixed wet

C

X is less consolidated and mixed wet, Y is more consolidated and water wet

D

X is less consolidated and water wet, Y is more consolidated and mixed wet

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15

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

At a particular temperature, the vapour pressure of benzene and toluene are 4 atm and 1.2 atm, respectively. The composition of the liquid at equilibrium is 0.5 moles of benzene and 0.5 moles of toluene. Assuming ideal gas and ideal solution, the equilibrium vapour phase mole fraction of benzene is __________. (rounded-off to two decimal places)

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16

2018 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2018

A heterogeneous rectangular rock of cross-sectional area 1 m² perpendicular to the flow is being flooded by water to measure the effective permeability from cross-section AA' to cross-section CC'. The pressure at the cross-sections AA', BB', and CC' is 2 bar, 1.5 bar, and 1 bar, respectively. The permeability in milli-Darcy and lengths AB and BC in meters are given in the figure. The effective permeability of the rock from AA' to CC' is _____mD. (rounded-off to two decimal places)

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17

2020 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2020

Shear stress versus shear rate plots for four different fluids are given in the Figure. Which curve represents a pseudoplastic fluid?

A

I

B

II

C

III

D

IV

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18

2020 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2020

Formation volume factor (B_o) versus Pressure (P) plot for an oil is given in the Figure. Match the following with the corresponding pressure given in the Figure. I. Bubble point II. Saturated oil III. Under-saturated oil

A

I- P₁, II- P₂, III- P₃

B

I- P₁, II- P₃, III- P₂

C

I- P₂, II- P₁, III- P₃

D

I- P₂, II- P₃, III- P₁

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19

2020 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2020

Two rigid spherical particles of the same density, with a diameter ratio D₁ : D₂ = 1:2, settle freely through a pool of liquid. The terminal settling velocity is given by the Stokes’ law. What is the ratio of their terminal settling velocities, V₁ : V₂?

A

1:2

B

2:1

C

1:4

D

4:1

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20

2020 · Petroleum Engineering · Reservoir Engineering · Rock and Fluid Properties

Petroleum Engineering (PE) 2020

A dry gas well is producing a gas stream of the following molar composition: 95% methane and 5% carbon dioxide. The molar mass of methane is 16 g/mol and that of carbon dioxide is 44 g/mol. Assuming ideal gas behavior, gas constant R = 8.31 J mol^-1 K^-1, the gas stream density at 10⁷ Pa and 350 K (rounded off to one decimal place) is ___________ kg/m³.

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