1.
Which one is an essential part of the rotary drilling system
a) Drilling fluid
b) Drilling engineer
c) Landman
d) Derrick man
2. Objectives of any mud program are
a) Allow the target depth to be reached
b) Minimize well costs
c) Maximize production from the hpay zone
d) All of the above
3. In mud program, factors needing to be considered are
a) Location of wells
b) Expected lithology
c) Mud properties
d) All of the above
4. No one could successfully drill wells with the rotary method without using
a) Drilling mud
b) Bailer
c) Water
d) Acid
5. Which one is not a function of drilling mud?
a) Remove cuttings
b) Formation of mud cake
c) Cooling of bit
d) Drill pipe lubrication
6. The first-ever drilling fluid used was
a) Oil
b) Water
c) Emulsion
d) None of the above
7. Water was used as first drilling fluid in
a) 1840
b) 1845
c) 1850
d) 1855
8. Water was used as the first drilling fluid in 1845 in
a) France
b) Norway
c) Saudi Arabia
d) None of the above
9. Drilling fluids are classified as
a) Liquid
b) Gases
c) Liquid-gas mixtures
d) All of the above
10. In rotary drilling, drill cuttings are removed by
a) Drilling mud
b) Bailer
c) Water
d) Acidizing
11. Which one is responsible for circulating mud to the formation?
a) Hoisting system
b) Power system
c) Circulating system
d) Rotary system
12. A fresh water based drilling fluid with additives is commonly called
a) Drilling mud
b) Acid
c) Chemical agents
d) None of the above
13. must often be added to these fluids to overcome specific downhole problems.
a) Chelating agents
b) Acids
c) Additives
d) None of the above
14. Drilling mud in which the continuous phase is water is called
a) Oil-based muds
b) Water-based muds
c) Emulsion-based muds
d) All of the above
15. Salt water drilling fluids are prepared from
a) Brine water
b) Sea water
c) Dry sodium chloride
d) All of the above
16. Salt water drilling fluids have a chloride content of
a) 6,000 mg/lt to less 189,000 mg/lt
b) 5,500 mg/lt to less 190,000 mg/lt
c) 4,500 mg/lt to less 200,000 mg/lt
d) None of the above
17. A mud with salt or calcium to reduce active clays hydration is called
a) Oil-based mud
b) Inhibited mud
c) Dehydrated mud
d) None of the above
18. Distinction between fresh-water and inhibited muds is based on
a) Salt concentration
b) Oil concentration
c) Additive concentration
d) None of the above
19. Sodium ion concentration in fresh-water mud is
a) Less than 5000 ppm
b) Less than 3000 ppm
c) Greater than 3000 ppm and less than 5000 ppm
d) None of the above
20. Low solid muds are those where solid contents are
a) Less than 5%
b) Between 5–10 %
c) Less than 3%
d) None of the above
21. The drilling mud with oil as solvent carrier for the solids content is known as
a) Oil-based mud
b) Water-based mud
c) Emulsion-based mud
d) None of the above
22. Which of the following is used as base fluids in OBM?
a) Diesel
b) Kerosene
c) Fuel oils
d) All of the above
23. Which of the following is used as drilling fluids in directional and horizontal
wells?
a) Oil-based mud
b) Water-based mud
c) Emulsion-based mud
d) None of the above
24. Which of the following is the type of OBM?
a) Invert emulsion oil-based mud
b) Pseudo oil-based mud
c) Full oil mud
d) All of the above
25. Water content in OBM is less than
a) 10%
b) 3%
c) 7%
d) 5%
26. Which of the following is the continuous phase in invert emulsion oil-based?
a) Mineral oil
b) Brine
c) CaCl2 Brine
d) None of the above
27. Air with additives is referred to as .
a) Pollution
b) Foam
c) Vapors
d) None of the above
28. Biodegradable mixtures of surfactants are generally known as
a) Chelating agents
b) Additives
c) Foaming agents
d) None of the above
29. Bentonite mixed with water produces slurry with greater than water.
a) Viscosity
b) Density
c) Salt concentration
d) All of the above
30. Use of additives are characterized mainly under,
a) Chemical additives
b) Additives for WBM
c) Additives for OBM
d) All of the above
31. The correct selection of drilling fluid directly affects
a) The rate of penetration
b) Drilling fluids cost
c) Overall drilling cost
d) All of the above
32. The following objectives are set for mud engineering. Which one is not the
correct answer?
a) Reach the target depth
b) Minimize well cost
c) Maximize the rate of penetration
d) Enhance the oil production
33. One of the following mud properties is responsible for suspending the drill
cuttings. Which one is the correct answer?
a) Gel strength
b) Mud density
c) Yield strength
d) Mud viscosity
34. The main purpose of preparing drilling mud during well control situations is
to
a) Remove the cuttings out of the well
b) Provide sufficient hydrostatic pressure to control formation fluids
c) Cool and lubricate the drill bit
d) Form a low permeable mud cake
35. The mud property that is responsible for providing the necessary hydrostatic
pressure is
a) Mud viscosity
b) Gel strength
c) Mud weight
d) All of the above
36. The mud properties that are responsible for removing the cutting out of the
well are
a) Gel strength and viscosity
b) Gel strength and density
c) Viscosity and density
d) None of the above
37. What is the importance of removing drill cutting off the well?
a) Reducing the horsepower required to run the circulating system
b) Knowing some information about the drilled formation
c) Reducing the needed circulating rate
d) All of the above
38. Which of the following mud types is not commonly used in drilling?
a) Liquid-based muds
b) Oil-based muds
c) Gas-based muds
d) None of the above
39. What is the common drilling fluid type which is widely used in drilling?
a) Compressed air
b) Oil-based mud
c) Foam-based mud
d) Water-based mud
40. The main governing factor for selecting the type of drilling fluid is the
a) Type of expected formation fluid
b) Type of mud pumps
c) Type of the formation
d) All of the above
