Reservoir Flow and Drive Mechanisms - Reservoir Engineering - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2016

The figure shows the producing gas oil ratio (GOR) behaviour with time for an oil reservoir under primary production. At initial reservoir condition, P_b is the bubble point pressure of the crude oil. P_R(t) represents the reservoir pressure at time ‘t’. Which of the following statements is TRUE?

A

P_R(t_1) > P_b, P_R(t_2) > P_b

B

P_R(t_1) > P_b, P_R(t_2) < P_b

C

P_R(t_1) < P_b, P_R(t_2) > P_b

D

P_R(t_1) < P_b, P_R(t_2) < P_b

Open complete paper

2

2016 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2016

An oil well is drilled to cover a circular drainage area of radius 700 ft. The well is completed with a 7 inch production casing. Assume reservoir pressure of 1000 psig, permeability of 50 md, pay zone thickness of 20 ft, oil viscosity of 3 cp and oil formation volume factor of 1.25 reservoir-bbl/STB.
For a flowing bottom-hole pressure of 500 psig, the primary production rate is _____ STB/day.

Check answer

Open complete paper

3

2016 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2016

An oil well of wellbore radius 0.5 ft is shown to develop a skin due to formation damage. The damaged zone radius is 2.25 ft around the well. The formation permeability is 300 md and the permeability of the damaged zone is 100 md.
The effective well bore radius for this well is__________ ft.

Check answer

Open complete paper

4

2016 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2016

For a water-flood operation in a one-dimensional reservoir, the following data are given. Porosity, φ = 0.25; Cross-sectional area, A = 25,000 ft²; Horizontal distance between the vertical production and injection well = 600 ft; Water injection rate, i_w = 900 bbl/day; Slope of fractional flow curve at shock front water saturation = 1.97; Water formation volume factor = 1.0 bbl/STB.
[ 1 bbl = 5.615 ft³ ]
The cumulative water volume injected at breakthrough is__________ × 10⁵ bbl.

Check answer

Open complete paper

5

2017 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2017

Which one of the following curves shows a typical behavior of the producing gas oil ratio (GOR) with time for a reservoir under solution gas drive?

A

Graph A

B

Graph B

C

Graph C

D

Graph D

Open complete paper

6

2017 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2017

Which one of the following statements is correct for pseudo-steady state condition in a confined reservoir?

A

The pressure decline stops in the reservoir.

B

The pressure declines at the same rate across the reservoir.

C

The boundary pressure does not change.

D

The pressure starts increasing in the reservoir.

Open complete paper

7

2017 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2017

Relative permeability curves are shown in the following figure for a water-oil system in a porous medium. \(S_w\) is water saturation and \(k_r\) is relative permeability. Curve 1 is relative permeability of water and Curve 2 is relative permeability of oil. Assuming the porous medium is at irreducible water saturation initially, the maximum possible recovery of oil by water flooding is _____%. (write answer with one decimal place)

Check answer

Open complete paper

8

2017 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2017

A well of radius 0.25 m is drilled. Mud invasion in the formation caused a skin radius of 2 m and reduced the permeability of the damaged zone to 30 mD. Well test revealed that the skin factor of the damaged zone is 2.3. The permeability of the unaffected formation will be ______ mD. (write answer with one decimal place)

Check answer

Open complete paper

9

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

A fractional flow curve is given for a core for which the irreducible water saturation is 0.2 and the residual oil saturation is 0.3. The initial water saturation in the core is 0.3. If Welge’s method is applied to find the breakthrough saturation and fraction flow of water at breakthrough, which point should be used in the figure to draw a tangent line to the fractional flow curve.

A

I

B

II

C

III

D

IV

Open complete paper

10

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

Assume that viscous, gravity, and capillary are the only dominant forces for fluid flow in a given reservoir, a cone formed around the perforation zone will break into the well, when

A

capillary forces are more than viscous and gravity forces.

B

viscous forces are more than gravity forces.

C

gravity forces are more than capillary forces.

D

viscous and gravity forces are equal.

Open complete paper

11

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

In an oil reservoir the current average pressure is below bubble point pressure of the oil. The current oil production rate is 10³ m³/day and total gas production rate is 10⁵ m³/day at STP conditions (25°C and 1 atm). The formation volume factor of the oil is 1.2 m³ at reservoir pressure / m³ at STP and that of gas is 0.01 m³ at reservoir pressure / m³ at STP. The dissolved gas oil ratio is 10 m³ of gas at STP / m³ of oil at STP of oil. The gas flow rate at bottom-hole conditions is __________× 10⁵ m³ per day. (rounded-off to two decimal places)

Check answer

Open complete paper

12

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

Match the following:

A

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

B

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

C

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

D

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

Open complete paper

13

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

Which one of the following options presents the correct combinations?
(P) Borisov’s    (I) Critical rate correlation in vertical wells with coning
(Q) Schols’    (II) Horizontal well performance relation
(R) Efros’    (III) Vertical well performance relation
(S) Wiggins’    (IV) Critical rate correlation in horizontal wells with coning

A

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

B

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

C

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

D

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

Open complete paper

14

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

An oil well is tested at a flow rate (Q) of 50 BOPD. The bottom hole flowing pressure (P_wf) is 500 psia. The shut-in pressure is 1000 psia. If P_wf is lowered to 300 psia and assuming the Vogel’s correlation holds, the estimated flow rate in the oil well is ______BOPD (rounded-off to two decimal places). The Vogel’s correlation is:
\( \frac{Q}{Q_{max}} = 1 - 0.2 \left( \frac{P_{wf}}{\bar{P}} \right) - 0.8 \left( \frac{P_{wf}}{\bar{P}} \right)^2 \)

Check answer

Open complete paper

15

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

Oil is being transported between two reservoirs with the help of three parallel pipes at steady state. The diameters of these pipes are 2 cm, 3 cm and 4 cm, respectively. The pipes are equal in length and the flow is laminar. The discharge through the 4 cm diameter pipe is 50 litres/s. The discharge through the 2 cm diameter pipe is _____ litres/s. (rounded-off to two decimal places)

Check answer

Open complete paper

16

2018 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2018

The viscosity, \(\mu\) (in Pa.s) of a power law fluid as a function of shear rate, \(\dot{\gamma}\) (in s⁻¹) is given by the following relation: \[ \mu = \frac{1}{2} |\dot{\gamma}| \] This power law fluid lies between two infinitely large horizontal parallel plates separated by a distance (\(h\)) of \(10^{-3}\) m. The top plate is moving horizontally at a velocity (\(v\)) of \(10^{-3}\) m/s and the bottom plate is held stationary. Assuming laminar flow and neglecting gravity, the absolute value of steady-state shear stress acting on the bottom plate is _____ Pa. (rounded-off to two decimal places)

Check answer

Open complete paper

17

2020 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2020

Consider unidirectional, laminar flow of water through a homogeneous porous media as shown in the Figure. Here, H = 100 m, W = 500 m, L = 500 m, permeability of the porous media is 10^-12 m², and the driving pressure drop (across length L) is 10⁶ Pa. Use the viscosity of water as 10^-3 Pa.s.

At steady state, the volumetric flow rate of water (rounded off to two decimal places) is given by _____________ m³/s.

Check answer

Open complete paper

18

2020 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2020

The initial oil production from an offshore well is 1000 STB/day, which decreased to 960 STB/day in 30 days. Using the ‘exponential decline model’, the daily production rate after 360 days from the start (rounded off to one decimal place) will be ______________ STB/day.

Check answer

Open complete paper

19

2020 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2020

An incompressible fluid is flowing through a tube of radius, R and length, L. The shear rate dependence of the fluid viscosity is given by the power law, $\mu = k|\dot{\gamma}|^{n-1}$ where, $\dot{\gamma}$ is the scalar shear rate, $k$ is a constant, and $n$ is the flow behavior index. Assuming the flow to be steady, laminar, and fully developed, the velocity profile inside the tube for a pressure drop of $\Delta p$ applied across the tube is

A

$\left(\frac{\Delta p}{2kL}\right)^{\frac{1}{n}} \left(\frac{n}{n+1}\right) R^{\frac{n+1}{n}} \left[1-\left(\frac{r}{R}\right)^{\frac{n+1}{n}}\right]$

B

$\left(\frac{\Delta p}{2kL}\right)^{\frac{1}{n}} \left(\frac{n+1}{n+2}\right) R^{\frac{n+1}{n}} \left[1-\left(\frac{r}{R}\right)^{\frac{n+1}{n}}\right]$

C

$\left(\frac{\Delta p}{2kL}\right)^{\frac{1}{n}} \left(\frac{n}{n+2}\right) R^{\frac{n+2}{n}} \left[1-\left(\frac{r}{R}\right)^{\frac{n+2}{n}}\right]$

D

$\left(\frac{\Delta p}{8kL}\right)^{n} R^2 \left[1-\left(\frac{r}{R}\right)^{2n}\right]$

Open complete paper

20

2020 · Petroleum Engineering · Reservoir Engineering · Reservoir Flow and Drive Mechanisms

Petroleum Engineering (PE) 2020

A unidirectional, immiscible displacement of an oil is carried out with water in a cylindrical reservoir core sample (Buckley-Leverett theory is applicable). The connate water saturation is 0.25. A fractional flow of water (f_w) vs. water saturation (S_w) curve is drawn for the process. A line drawn from a point (S_w = 0.25, f_w = 0) on the fractional flow curve is tangent at the point (S_w = 0.8, f_w = 0.8) on the curve. The average water saturation (S̅_w) in the core at the time of breakthrough (rounded off to two decimal places) is ______ (in fraction).

Check answer

Open complete paper