NGWA CWD Practice Questions - NGWA Certified Well Driller Exam

In mud rotary drilling, what is the primary purpose of drilling fluid (mud)?

To lubricate the drill pipe threads To cool the surface pump only To remove cuttings, cool the bit, and stabilize the borehole wall To chemically dissolve formation materials ahead of the bit

Correct Answer:

To remove cuttings, cool the bit, and stabilize the borehole wall

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