AZ ROC C-53 Water Well Drilling Practice Questions - Arizona ROC C-53 Water Well Drilling Examination Exam

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In air rotary drilling, what minimum annular air velocity is recommended to efficiently lift drill cuttings to the surface from a 600-foot deep borehole?

500 to 1,000 ft/min 1,500 to 2,000 ft/min 3,000 to 4,000 ft/min 8,000 to 10,000 ft/min

Correct Answer:

3,000 to 4,000 ft/min

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