Drilling Fluids and Cementing - Oil and Gas Well Drilling Technology - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2016

One thousand sacks of cement are required for cementing a protection casing of setting depth of 12,000 ft (top float collar) and annular capacity of 0.40 ft³ per linear ft. The cementing truck has a mixing capacity of 20 sacks per min. A 1.15 ft³/cycle capacity rig mud pump having an 18 inch stroke and a 6 1/2 inch liner operating at 60 rpm with 90% efficiency is used for the cementing job.
The total cementing time is __________ min.

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2

2016 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2016

It is desired to increase the density of 200 bbl of 10 ppg mud to 12 ppg mud using API Barite of density 35 ppg. The final volume is not limited.
[1 bbl = 42 gallons]
The amount of API Barite required is __________ lbm.

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3

2016 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2016

Using the High Pressure High Temperature (HPHT) filter press data given below, the estimated API filtration loss is __________ cm³.

Data given:

Time (min)	Filtrate volume (cm³)
1.0	6.5
7.5	14.0

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4

2016 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2016

A producing well has a shut-in tubing pressure of 3,950 psig for crude oil of specific gravity 0.69. [1 g/cm³ = 8.33 ppg]
The kill fluid density for a workover job at 11,600 ft (TVD) is__________ ppg.

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5

2017 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2017

A self-flowing production well of depth 3,000 m having oil with density 850 kg/m³ is shut-in for workover job. The shut-in pressure at the surface is 70 × 10⁵ N/m². The density of the mud required to kill the well will be ______ kg/m³. (g = 9.81 m/s², write answer with one decimal place)

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6

2018 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2018

Match the following chemicals to their respective oilfield applications:
(P) Hydrate inhibitor                                 (I) Formaldehyde
(Q) Well stimulation                             (II) Xanthan gum
(R) Drilling fluid biocide                        (III) Methanol
(S) Viscosifier                                     (IV) Hydrochloric acid

A

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

B

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

C

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

D

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

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7

2018 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2018

Which one of the following is INCORRECT about oil based drilling muds?

A

Good rheological properties at higher temperatures (as high as 250°C)

B

Effective against corrosion

C

Detection of gas kick is difficult

D

Less inhibitive than water based muds

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8

2018 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2018

A driller finds an oil reservoir with a gas cap starting at a depth of 1000 m from the surface. The gas-oil contact was found at 1100 m depth and water-oil contact was found at 1300 m depth. The water pressure in the aquifer below the oil zone varies with depth from the surface (\(h\), in meters) as, \(P = h \times 10^4\) Pa. The density of the oil is 900 kg/m³ and that of the gas is 5 kg/m³ at the reservoir condition. The minimum density of the mud needed to stop the gas kick when the driller reaches at the top of the gas cap is _____kg/m³. (rounded-off to two decimal places. Use g = 9.81 m/s²)

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9

2020 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2020

Which one of the following additives is commonly added to drilling fluids to remove hydrogen sulfide?

A

Sodium chloride

B

Calcium chloride

C

Zinc carbonate

D

Bentonite

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10

2020 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2020

Consider fluid flow through the annular space between two cylindrical tubes. The outer diameter of the inner tube is 40 mm and the inner diameter of the outer tube is 50 mm. The hydraulic mean diameter for fluid flow calculations (rounded off to one decimal place) is ______________ mm.

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11

2020 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2020

A pre-flush of 15 wt% HCl solution (density = 1070 kg/m³) is used to dissolve dolomite in a sandstone reservoir. The molecular formula, molar mass, and density of dolomite are CaMg(CO₃)₂, 184.3 g/mol, and 2840 kg/m³, respectively. The molar mass of HCl is 36.5 g/mol. If the pre-flush has to remove all the dolomite, the volumetric dissolving power of the pre-flush (rounded off to three decimal places) is ______ (m³ of dolomite/m³ of 15 wt% HCl solution).

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12

2020 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2020

It is desired to prepare a Class H cement slurry having a density of 2100 kg/m³ using hematite as an additive. The water requirement for the Class H cement is 20 litre/50 kg cement and that for hematite is 3 litre/1000 kg hematite.
Given:
Density of class H cement = 3125 kg/m³
Density of hematite = 5000 kg/m³
Density of water = 1000 kg/m³
Weight of one sack of cement = 50.0 kg
Assuming zero volume change of mixing, the amount of hematite that should be blended with one sack of cement (rounded off to two decimal places) is ______ kg.

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13

2021 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2021

Oil and gas pipelines, which are at an elevated pressure (about 3 MPa) and sub-ambient temperature (below 298 K), may get blocked by the formation of solid hydrates. One of the strategies adopted to inhibit the formation of hydrates is the injection of Thermodynamic Hydrate Inhibitors (THIs) into the reservoir fluid.
Identify all suitable chemicals that are commonly used as THIs.

A

Sodium Chloride

B

Methanol

C

Polyvinylpyrrolidone

D

Sodium Dodecyl Sulphate

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14

2021 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2021

A double acting duplex pump with a rod diameter of 2.5 inch and a stroke of 20 inch is to be operated at 60 strokes per minute for drilling down to 10000 ft. The flow rate is 600 gpm. If the volumetric efficiency of the pump is 80%, the liner size is __________ inch (round off to one decimal place).
[1 gallon = 231 inch³]

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15

2022 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2022

A drilling mud with high gel strength is undesirable because it

A

retards the separation of cuttings and entrained gas at the surface.

B

leads to the lost circulation.

C

creates swabbing action beneath the bit while pulling the string.

D

leads to the hole ballooing.

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16

2022 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2022

A brine solution is being injected at a velocity \(u\) downward through a tubing of diameter \(d\) inclined at an angle of \(\theta\) from vertical with gravitational acceleration g. Which ONE of the following options is CORRECT for the velocity \(u\) and the angle \(\theta\) such that the ratio of frictional pressure drop to the gravitational pressure drop is four times the Fanning friction factor?

A

\(u = (2gd)^{1/2}; \theta = 30^{\circ}\)

B

\(u = gd; \theta = 30^{\circ}\)

C

\(u = (gd)^{1/2}; \theta = 60^{\circ}\)

D

\(u = gd^{1/2}; \theta = 30^{\circ}\)

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17

2024 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2024

Marsh funnel viscosity is reported as number of seconds required for one quart of drilling fluid sample to flow out of a Marsh funnel. The time of efflux of one quart of fresh water from a Marsh funnel at 70±5 °F is ______ seconds.

A

21±0.5

B

26±0.5

C

31±0.5

D

36±0.5

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18

2024 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2024

Which mud type will have the highest acoustic velocity from the following options?

A

Mud with live oil at low temperature

B

Mud with dead oil at high temperature

C

Mud with live oil at high temperature

D

Mud with dead oil at low temperature

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19

2024 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2024

A field rotational viscometer containing a drilling fluid gives a dial reading of 12° and 20° at rotor speeds of 300 rpm and 600 rpm, respectively. The drilling fluid is assumed to obey power law model, \( \tau = K \dot{\gamma}^n \), where, \( \tau \) is the shear stress, \( \dot{\gamma} \) is the shear rate, \( K \) is the consistency index and \( n \) is the power law index.
The power law index, \( n \), is ________ (round off to two decimal places).

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20

2024 · Petroleum Engineering · Oil and Gas Well Drilling Technology · Drilling Fluids and Cementing

Petroleum Engineering (PE) 2024

The settling velocity (\(v_s\)) of a spherical particle in a Newtonian fluid using Stokes' law is \[ v_s = \frac{g d_s^2 (\rho_s - \rho_f)}{18\mu} \] where, \(d_s\) is the particle diameter, \(\rho_s\) is the particle density, \(\rho_f\) is the drilling fluid density, \(\mu\) is the drilling fluid viscosity, and \(g\) is acceleration due to gravity. The density of barite and a drilled solid particle are 4200 kg/m³ and 2600 kg/m³, respectively. The density of the drilling fluid is 1300 kg/m³. The diameter of a drilled spherical solid particle that has the same settling velocity as a spherical barite particle of 0.1 mm diameter in the drilling fluid is _________mm (round off to two decimal places).

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