NGWA General Drilling Review Guide
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. A water well is best defined as:
A. A reservoir for surface water storage
B. An excavation constructed for extracting groundwater
C. A pipe used to transport water
D. A storage tank below grade
Answer: B. An excavation constructed for extracting groundwater
2. Which of the following methods may be used to construct a water well?
A. Drilled, bored, dug, driven, jetted
B. Cast, forged, welded, molded
C. Pumped, filtered, distilled
D. Injected, compressed, evaporated
Answer: A. Drilled, bored, dug, driven, jetted
3. Which components make up a cable tool drill string?
A. Drill pipe, stabilizer, mud motor
B. Socket, jars, stem, drill bit
C. Pump, casing, screen
D. Kelly, swivel, pump
Answer: B. Socket, jars, stem, drill bit
,4. The drill string is best described as:
A. The casing installed in the well
B. The entire column transmitting rotational power to the bit
C. The pump assembly
D. The well screen
Answer: B. The entire column transmitting rotational power to the bit
5. Which components are included in a rotary drill string?
A. Drill bit, drill collar, drill pipe, Kelly
B. Bailor, jars, socket
C. Pump, casing, screen
D. Air compressor and hose
Answer: A. Drill bit, drill collar, drill pipe, Kelly
6. Porosity refers to:
A. Permeability of soil
B. Percentage of void space in geologic formation
C. Density of rock
D. Grain size of formation
Answer: B. Percentage of void space in geologic formation
7. Barite is used in drilling fluids to:
A. Reduce viscosity
B. Increase weight of drilling mud
C. Increase foam production
D. Decrease density
Answer: B. Increase weight of drilling mud
,8. Air rotary drilling uses which circulating medium?
A. Water
B. Mud
C. Compressed air
D. Oil
Answer: C. Compressed air
9. Surfactants are used in drilling to:
A. Increase casing strength
B. Improve flushing of cuttings and create foam
C. Reduce pump pressure
D. Harden the borehole wall
Answer: B. Improve flushing of cuttings and create foam
10.The constant 2.31 is used to convert:
A. Flow to pressure
B. PSI to feet of head
C. Velocity to pressure
D. Gallons to cubic feet
Answer: B. PSI to feet of head
11.Well development is performed to:
A. Install casing
B. Remove fine materials and optimize production
C. Drill deeper
D. Install pump
Answer: B. Remove fine materials and optimize production
, 12.Which of the following is a well development method?
A. Surging
B. Jetting
C. Over pumping
D. All of the above
Answer: D. All of the above
13.Over pumping during well development involves:
A. Pumping at a lower rate
B. Pumping at a higher rate than normal operation
C. Pumping intermittently
D. Pumping air into well
Answer: B. Pumping at a higher rate than normal operation
14.Mechanical surging involves:
A. Injecting acid into formation
B. Rapid movement of a surge block to move water in and out of formation
C. Pumping at low rate
D. Using compressed air only
Answer: B
15.Air surging is performed by:
A. Injecting chemicals
B. Injecting compressed air to lift water and sediment
C. Pumping mud into formation
D. Using only water jets
Answer: B
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. A water well is best defined as:
A. A reservoir for surface water storage
B. An excavation constructed for extracting groundwater
C. A pipe used to transport water
D. A storage tank below grade
Answer: B. An excavation constructed for extracting groundwater
2. Which of the following methods may be used to construct a water well?
A. Drilled, bored, dug, driven, jetted
B. Cast, forged, welded, molded
C. Pumped, filtered, distilled
D. Injected, compressed, evaporated
Answer: A. Drilled, bored, dug, driven, jetted
3. Which components make up a cable tool drill string?
A. Drill pipe, stabilizer, mud motor
B. Socket, jars, stem, drill bit
C. Pump, casing, screen
D. Kelly, swivel, pump
Answer: B. Socket, jars, stem, drill bit
,4. The drill string is best described as:
A. The casing installed in the well
B. The entire column transmitting rotational power to the bit
C. The pump assembly
D. The well screen
Answer: B. The entire column transmitting rotational power to the bit
5. Which components are included in a rotary drill string?
A. Drill bit, drill collar, drill pipe, Kelly
B. Bailor, jars, socket
C. Pump, casing, screen
D. Air compressor and hose
Answer: A. Drill bit, drill collar, drill pipe, Kelly
6. Porosity refers to:
A. Permeability of soil
B. Percentage of void space in geologic formation
C. Density of rock
D. Grain size of formation
Answer: B. Percentage of void space in geologic formation
7. Barite is used in drilling fluids to:
A. Reduce viscosity
B. Increase weight of drilling mud
C. Increase foam production
D. Decrease density
Answer: B. Increase weight of drilling mud
,8. Air rotary drilling uses which circulating medium?
A. Water
B. Mud
C. Compressed air
D. Oil
Answer: C. Compressed air
9. Surfactants are used in drilling to:
A. Increase casing strength
B. Improve flushing of cuttings and create foam
C. Reduce pump pressure
D. Harden the borehole wall
Answer: B. Improve flushing of cuttings and create foam
10.The constant 2.31 is used to convert:
A. Flow to pressure
B. PSI to feet of head
C. Velocity to pressure
D. Gallons to cubic feet
Answer: B. PSI to feet of head
11.Well development is performed to:
A. Install casing
B. Remove fine materials and optimize production
C. Drill deeper
D. Install pump
Answer: B. Remove fine materials and optimize production
, 12.Which of the following is a well development method?
A. Surging
B. Jetting
C. Over pumping
D. All of the above
Answer: D. All of the above
13.Over pumping during well development involves:
A. Pumping at a lower rate
B. Pumping at a higher rate than normal operation
C. Pumping intermittently
D. Pumping air into well
Answer: B. Pumping at a higher rate than normal operation
14.Mechanical surging involves:
A. Injecting acid into formation
B. Rapid movement of a surge block to move water in and out of formation
C. Pumping at low rate
D. Using compressed air only
Answer: B
15.Air surging is performed by:
A. Injecting chemicals
B. Injecting compressed air to lift water and sediment
C. Pumping mud into formation
D. Using only water jets
Answer: B
