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NGWA - Study Guide - Air Rotary | Questions with 100 % Correct Answers | Verified

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Institution NGWA - Air Rotary
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Precautions for sand seams • Reduce air pressure • Use foam/polymers • Monitor cuttings • Advance casing • Slow drilling rate How are samples obtained? • Continuous cuttings • Split-spoon sampling • Drilling fluids/polymers Factors affecting hole cleaning/penetration rates • Air pressure/volume • Formation type • Bit type/condition • Drill pipe size/depth • Cutting size/volume Methods to clean cuttings • Airflow • Foam injection • Polymer use How to control caving• Foam/polymers • Reduce air pressure • Advance casing

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NGWA - Study Guide - Air Rotary

Precautions for sand seams

• Reduce air pressure
• Use foam/polymers
• Monitor cuttings
• Advance casing
• Slow drilling rate



How are samples obtained?

• Continuous cuttings
• Split-spoon sampling
• Drilling fluids/polymers



Factors affecting hole cleaning/penetration rates

• Air pressure/volume
• Formation type
• Bit type/condition
• Drill pipe size/depth
• Cutting size/volume



Methods to clean cuttings

• Airflow
• Foam injection
• Polymer use



How to control caving

, • Foam/polymers
• Reduce air pressure
• Advance casing



When is gravel packing necessary?

• To prevent sand intrusion in unconsolidated formations



How does air pressure change with depth?

• Must increase to maintain cuttings removal



Advantages/disadvantages of high-pressure air rotary

Advantages:

• Faster drilling
• Efficient cuttings

Disadvantages:

• Formation collapse risk
• Blowouts



Cost per foot vs. mud rotary

• Air rotary is cheaper due to speed
• Mud rotary stabilizes boreholes better



Uphole annular velocity range

• 3,000–5,000 ft/min

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