Chemical and Miscible Flooding - Enhanced Oil Recovery Techniques - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2016

Identify the pair of CORRECT statements for surfactant-micellar-polymer flooding.
I. It reduces interfacial tension between crude oil and water.
II. It influences mobility ratio unfavourably.
III. It improves microscopic displacement efficiency.
IV. It increases isothermal compressibility of the crude oil.

A

I & II

B

I & III

C

III & IV

D

II & IV

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2

2016 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2016

A heavy oil reservoir is being flooded with a line drive (assume one-dimensional flooding). The fractional flow of water is found to be 0.75 bbl/bbl at water saturation (S_w) of 60%. A polymer solution with twice the viscosity of water is used as displacing phase. Assume the relative permeability curves for water flooding and polymer flooding are the same.
The fractional flow of polymer solution at a saturation of 60% is__________ bbl/bbl.

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3

2017 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2017

The problem of viscous fingering is encountered when:

A

A low viscosity fluid is injected in a high viscosity fluid.

B

A high viscosity fluid is injected in a low viscosity fluid.

C

A fluid of equal viscosity but lower density is injected in a fluid of higher density.

D

None of the above.

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4

2018 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2018

\(CO_2\) foams are used for enhanced oil recovery due to which of the following reasons?
(I) It can be used for \(CO_2\) sequestration
(II) \(CO_2\) can exist in the form of a dense fluid at reservoir conditions
(III) \(CO_2\) can convert to hydrocarbon at the reservoir temperature and pressure
(IV) Solubility of \(CO_2\) in oil is higher compared to gases like \(N_2\)

A

Only I, II, and III

B

Only I, II, and IV

C

Only II, III, and IV

D

Only I, III, and IV

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5

2020 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2020

Match the following for Enhanced Oil Recovery operations \n (P) Surfactant flooding (I) Prevent viscous fingering \n (Q) Polymer flooding (II) Decrease oil viscosity \n (R) Alkali flooding (III) Reduce interfacial tension \n (S) Steam injection (IV) Reaction with naphthenic acid

A

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

B

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

C

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

D

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

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6

2021 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2021

A measure of the potential of crude oil to form surfactants for Enhanced Oil Recovery (EOR) is given by the Total Acid Number (TAN). TAN is the mass of ______ (in milligrams) that is required to neutralize one gram of crude oil.

A

Ca(OH)₂

B

NaCl

C

KOH

D

NaOH

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7

2021 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2021

In Water-Alternating-Gas (WAG) injection, the purpose of the injection is to ____I____ the “relative permeability” of gas and to ____II____ the “mobility” of the gas.

A

I = reduce, II = enhance

B

I = reduce, II = reduce

C

I = enhance, II = reduce

D

I = enhance, II = enhance

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8

2021 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2021

Heavy oil recovered from reservoirs can be represented by CₓH₁.₅ₓ.
Suitable processes to reduce the density of heavy oil are

A

Carbon Rejection

B

Pyrolysis

C

Hydrogenation

D

Filtration

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9

2021 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2021

Select the INCORRECT statement related to Enhanced Oil Recovery (EOR) techniques from the following options.

A

Alkaline flooding recovers crude oil by reduction of interfacial tension (IFT) and reversal of wettability of rocks.

B

In-situ combustion recovers crude oil by the application of heat, thus lowering the viscosity of the crude oil.

C

Nitrogen flue gas flooding recovers crude oil by vaporizing the lighter components of the crude oil.

D

Polymer flooding recovers crude oil by reducing the viscosity and increasing the mobility of water.

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10

2022 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2022

Which of the following statements related to the 'enriched gas drive' are CORRECT?

A

The enriching components are transferred from the oil to the gas.

B

The enriched gas drive is an example of immiscible enhanced oil recovery.

C

A miscible zone is formed between the injected gas and the reservoir oil.

D

In enriched gas drive, the viscous fingering results in poor sweep efficiency.

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11

2024 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2024

A surfactant enhanced oil recovery process has been employed using a five-spot injection pattern on a sandstone reservoir. The reservoir has the following properties.
Reservoir area, A = 20 acres
Reservoir thickness, h = 25 ft
Porosity of the reservoir, φ = 0.20
Residual oil saturation at the termination of waterflood, S_orw = 0.30
Residual oil saturation left by surfactant flood, S_orc = 0.10
Oil formation volume factor, B_o = 1.05 reservoir bbl/STB
Volumetric sweep efficiency, E_v = 1
The initial oil saturation of the reservoir = 0.75.
The ratio of oil displaced due to surfactant flood to the original oil in place at reservoir condition is __________ (round off to two decimal places).
(Take: 1 acre = 43560 ft², 1 bbl = 5.615 ft³).

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12

2025 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2025

Which of the following statement(s) is/are CORRECT about polymer flooding?

A

Viscous fingering in the reservoir decreases.

B

Viscosity of the displaced fluid increases.

C

Mobility of the displacing fluid increases.

D

Mobility ratio decreases.

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13

2023 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2023

Polymer flooding enhances oil recovery from an oil reservoir by

A

increasing the mobility ratio

B

reducing the mobility ratio

C

reducing the viscous fingering

D

increasing the viscous fingering

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14

2023 · Petroleum Engineering · Enhanced Oil Recovery Techniques · Chemical and Miscible Flooding

Petroleum Engineering (PE) 2023

Consider a micellar displacement process in a homogeneous reservoir with a porosity of 30%. The volume of the microemulsion slug to be injected is 4% of the pore volume. The slug contains 4 vol% surfactant. The density of the rock and the surfactant is 2.7 g/cm³ and 1.1 g/cm³, respectively.
Assuming that the average surfactant adsorption is 0.25 mg/g of the reservoir rock, the fraction of the injected surfactant that will be adsorbed is ______ (rounded to two decimal places).

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