NGWA STUDY QUESTIONS - GENERAL
DRILLING FINAL EXAM STUDY GUIDE
2025/2026 COMPLETE QUESTIONS |
VERIFIED ANSWERS | 100% CORRECT |
GRADED A+| PASS GUARANTEED
1. Define a water well. - ANSWER An excavation or structure created in the
ground by digging, driving, boring, or drilling to access groundwater.
2. What measures can be used to keep corrosion to a minimum in a water
system? - ANSWER Water Quality Management: Regularly monitoring
and adjusting pH and alkalinity to maintain neutral conditions, which can
help reduce corrosive effects.
3. Use of Corrosion Inhibitors: Adding chemicals that form protective films on
the surfaces of pipes and fixtures to minimize corrosion.
4. Material Selection: Using corrosion-resistant materials, such as stainless
steel, PVC, or polyethylene, for pipes and fittings.
5. Cathodic Protection: Implementing systems that use sacrificial anodes or
impressed current to prevent corrosion of metal surfaces.
,6. Regular Maintenance: Conducting routine inspections and maintenance to
identify and address corrosion issues before they escalate.
7. Avoiding Stagnation: Ensuring regular flow in the water system to prevent
stagnant water, which can contribute to corrosion.
8. Incrustations in a water well can cause complete plugging. How can this be
best treated? - ANSWER Chemical Treatment: Using acids (such as
hydrochloric or phosphoric acid) to dissolve mineral deposits like calcium
carbonate or iron oxide. The well should be properly neutralized after
treatment.
9. Mechanical Removal: Employing tools like scrapers, brushes, or hydro
jetting to physically remove incrustations from the well casing and screens.
10.Well Rehabilitation: Conducting a comprehensive cleaning process that may
involve both chemical and mechanical methods to restore the well's
performance.
11.Preventative Measures: After treatment, implementing measures such as
using a chemical inhibitor or adjusting water chemistry to prevent future
incrustations.
12.Wearing apparel around the drill rig should consist of what basic
components? - ANSWER Hard Hat: To protect against falling objects and
head injuries.
,13.Safety Glasses: To shield eyes from dust, debris, and potential chemical
splashes.
14.High-Visibility Clothing: Brightly colored shirts or vests to ensure visibility,
especially in busy areas.
15.Steel-Toed Boots: To protect feet from heavy equipment and falling objects.
16.Gloves: Suitable gloves for handling tools and materials, providing grip and
protection.
17.Hearing Protection: Earplugs or earmuffs to guard against noise from
drilling equipment.
18.Weather-Appropriate Gear: Depending on conditions, this may include rain
gear, insulated clothing, or sun protection.
19.What is a pitless adaptor? - ANSWER A pitless adaptor is a device used
to connect a well's casing to the water supply line while allowing for a
watertight seal. It enables the water to be drawn from the well without the
need for a pit or underground storage tank.
20.Explain the difference between the two common types of Kelly bars on
auger bucket rigs. - ANSWER Square Kelly Bar: This type has a square
cross-section and fits into a corresponding square drive on the rig. It
provides good torque transfer and is commonly used for standard drilling
operations. The square design helps with alignment and reduces slippage.
, 21.Hexagonal Kelly Bar: This type has a hexagonal cross-section and allows for
more torque transmission compared to a square bar. The hexagonal shape
provides better grip and alignment in the drive system, making it suitable for
deeper or more challenging drilling operations where greater force is
required.
22.Well drilled using guar gums and several polymers can achieve better
development by using ________ mixes in the development water. -
ANSWER Sodium or calcium hypochlorite.
23.(T/F) Aquifer development is not an effective way to increase yields
substantially. - ANSWER False.
24.What precautions must be used when sand seams are encountered in air
rotary drilling in unconsolidated formation? - ANSWER 1. Reduce Air
Pressure
2. Use of Foam or Polymers
3. Monitor Cuttings
4. Casing Advancement
5. Slow Drilling Rate
25.How are samples obtained in air rotary drilling in unconsolidated
formations? - ANSWER Continuous Sampling of Cuttings:
Split-Spoon Sampling
Drilling Fluids/Polymers
26.Hole cleaning and penetration rates will vary with air rotary. What factors
affect cleaning and penetration? - ANSWER Air Pressure and Volume
Formation Type
DRILLING FINAL EXAM STUDY GUIDE
2025/2026 COMPLETE QUESTIONS |
VERIFIED ANSWERS | 100% CORRECT |
GRADED A+| PASS GUARANTEED
1. Define a water well. - ANSWER An excavation or structure created in the
ground by digging, driving, boring, or drilling to access groundwater.
2. What measures can be used to keep corrosion to a minimum in a water
system? - ANSWER Water Quality Management: Regularly monitoring
and adjusting pH and alkalinity to maintain neutral conditions, which can
help reduce corrosive effects.
3. Use of Corrosion Inhibitors: Adding chemicals that form protective films on
the surfaces of pipes and fixtures to minimize corrosion.
4. Material Selection: Using corrosion-resistant materials, such as stainless
steel, PVC, or polyethylene, for pipes and fittings.
5. Cathodic Protection: Implementing systems that use sacrificial anodes or
impressed current to prevent corrosion of metal surfaces.
,6. Regular Maintenance: Conducting routine inspections and maintenance to
identify and address corrosion issues before they escalate.
7. Avoiding Stagnation: Ensuring regular flow in the water system to prevent
stagnant water, which can contribute to corrosion.
8. Incrustations in a water well can cause complete plugging. How can this be
best treated? - ANSWER Chemical Treatment: Using acids (such as
hydrochloric or phosphoric acid) to dissolve mineral deposits like calcium
carbonate or iron oxide. The well should be properly neutralized after
treatment.
9. Mechanical Removal: Employing tools like scrapers, brushes, or hydro
jetting to physically remove incrustations from the well casing and screens.
10.Well Rehabilitation: Conducting a comprehensive cleaning process that may
involve both chemical and mechanical methods to restore the well's
performance.
11.Preventative Measures: After treatment, implementing measures such as
using a chemical inhibitor or adjusting water chemistry to prevent future
incrustations.
12.Wearing apparel around the drill rig should consist of what basic
components? - ANSWER Hard Hat: To protect against falling objects and
head injuries.
,13.Safety Glasses: To shield eyes from dust, debris, and potential chemical
splashes.
14.High-Visibility Clothing: Brightly colored shirts or vests to ensure visibility,
especially in busy areas.
15.Steel-Toed Boots: To protect feet from heavy equipment and falling objects.
16.Gloves: Suitable gloves for handling tools and materials, providing grip and
protection.
17.Hearing Protection: Earplugs or earmuffs to guard against noise from
drilling equipment.
18.Weather-Appropriate Gear: Depending on conditions, this may include rain
gear, insulated clothing, or sun protection.
19.What is a pitless adaptor? - ANSWER A pitless adaptor is a device used
to connect a well's casing to the water supply line while allowing for a
watertight seal. It enables the water to be drawn from the well without the
need for a pit or underground storage tank.
20.Explain the difference between the two common types of Kelly bars on
auger bucket rigs. - ANSWER Square Kelly Bar: This type has a square
cross-section and fits into a corresponding square drive on the rig. It
provides good torque transfer and is commonly used for standard drilling
operations. The square design helps with alignment and reduces slippage.
, 21.Hexagonal Kelly Bar: This type has a hexagonal cross-section and allows for
more torque transmission compared to a square bar. The hexagonal shape
provides better grip and alignment in the drive system, making it suitable for
deeper or more challenging drilling operations where greater force is
required.
22.Well drilled using guar gums and several polymers can achieve better
development by using ________ mixes in the development water. -
ANSWER Sodium or calcium hypochlorite.
23.(T/F) Aquifer development is not an effective way to increase yields
substantially. - ANSWER False.
24.What precautions must be used when sand seams are encountered in air
rotary drilling in unconsolidated formation? - ANSWER 1. Reduce Air
Pressure
2. Use of Foam or Polymers
3. Monitor Cuttings
4. Casing Advancement
5. Slow Drilling Rate
25.How are samples obtained in air rotary drilling in unconsolidated
formations? - ANSWER Continuous Sampling of Cuttings:
Split-Spoon Sampling
Drilling Fluids/Polymers
26.Hole cleaning and penetration rates will vary with air rotary. What factors
affect cleaning and penetration? - ANSWER Air Pressure and Volume
Formation Type
