Reviewer 1 for MT

Question 1

What is the primary purpose of drilling fluids in a well?

A) Preventing water intrusion
B) Transporting cuttings to the surface
C) Increasing borehole size
D) Reducing formation pressure

Answer 1

B) Transporting cuttings to the surface

Question 2

Which drilling fluid system uses esters, ethers, or olefins as the main component?

A) Oil-based mud
B) Synthetic-based mud
C) Water-based mud
D) Gas-based mud

Answer 2

B) Synthetic-based mud

Question 3

What additive is commonly used to increase the density of drilling fluids?

A) Bentonite
B) Barite
C) Potassium chloride
D) Glycol

Answer 3

B) Barite

Question 4

How does a Marsh Funnel measure the viscosity of drilling fluids?

A) By recording fluid flow time
B) Using a filter press
C) By mixing drilling mud with barite
D) Through pressure measurements

Answer 4

A) By recording fluid flow time

Question 5

Which phase of drilling fluids is responsible for suspending particles?

A) Continuous phase
B) Disperse phase
C) Emulsion phase
D) Gaseous phase

Answer 5

A) Continuous phase

or idk

B) Disperse phase

Question 6

What is a typical method for reducing water loss in drilling fluids?

A) Adding biocides
B) Adding filtration control agents
C) Increasing the pH
D) Using seawater

Answer 6

B) Adding filtration control agents

Question 7

The addition of potassium chloride (KCl) in drilling fluids is primarily for:

A) Increasing density
B) Preventing shale swelling
C) Reducing viscosity
D) Enhancing filtration

Answer 7

B) Preventing shale swelling

Question 8

What is one disadvantage of using oil-based drilling fluids?

A) Higher toxicity
B) Low filtration loss
C) Reduced lubrication
D) Lower wellbore stability

Answer 8

A) Higher toxicity

Question 9

A filter press is primarily used to measure which property of drilling fluids?

A) Density
B) Gel strength
C) Filtration
D) Plastic viscosity

Answer 9

C) Filtration

Question 10

What type of formation commonly requires the use of synthetic-based mud?

A) High-temperature environments
B) Stable sandstones
C) Non-reactive shales
D) Low-temperature, shallow wells

Answer 10

A) High-temperature environments

Question 11

What is the effect of a high plastic viscosity (PV) in drilling fluids?

A) Indicates low solids content
B) Reduces risk of differential sticking
C) May suggest high solids or oil content
D) Enhances filtration properties

Answer 11

C) May suggest high solids or oil content

Question 12

What is the main difference between water-based mud (WBM) and oil-based mud (OBM) in terms of environmental impact?

A) WBMs are more harmful due to lower biodegradability
B) OBMs are less harmful due to lower toxicity
C) WBMs generally have lower environmental risk
D) OBMs are more environmentally friendly due to mineral oils

Answer 12

C) WBMs generally have lower environmental risk

Question 13

How is the yield point (YP) of a drilling fluid calculated using a Fann Viscometer?

A) (600 RPM reading) - (300 RPM reading)
B) (300 RPM reading) - PV
C) (600 RPM reading) + PV
D) (300 RPM reading) x PV

Answer 13

B) (300 RPM reading) - PV

Question 14

What kind of emulsion is formed in invert-emulsion oil-based mud?

A) Water droplets in an oil phase
B) Oil droplets in a water phase
C) Oil and water in equal parts
D) Gas bubbles in a liquid phase

Answer 14

A) Water droplets in an oil phase

Question 15

Which drilling fluid measurement can give an indication of cuttings suspension capacity?

A) Density
B) Yield point (YP)
C) Plastic viscosity (PV)
D) Marsh funnel viscosity

Answer 15

B) Yield point (YP)

Question 16

How does a high gel strength benefit drilling fluid performance?

A) Reduces fluid loss
B) Enhances lubrication
C) Increases suspension of solids at rest
D) Lowers formation damage

Answer 16

C) Increases suspension of solids at rest

Question 17

What are the effects of a thick filter cake on the wellbore?

A) Enhanced borehole stability
B) Risk of differential sticking
C) Reduced cuttings suspension
D) Increased corrosion resistance

Answer 17

B) Risk of differential sticking

Question 18

The API 13B-1 standard is primarily concerned with which aspect of drilling fluids?

A) Environmental impact
B) Measurement of properties
C) Composition standards
D) Additive guidelines

Answer 18

B) Measurement of properties

Question 19

Which of the following tests provides only an approximate measure of viscosity?

A) Fann Viscometer
B) Marsh Funnel
C) Mud balance
D) Filter press

Answer 19

B) Marsh Funnel

Question 20

In high-temperature drilling environments, what type of drilling fluid is typically preferred for its stability and low environmental impact?

A) Water-based mud
B) Non-inhibitive mud
C) Synthetic-based mud
D) Gas-based mud

Answer 20

C) Synthetic-based mud