NGWA CWD Practice Questions - NGWA Certified Well Driller Exam

Bentonite is commonly added to drilling mud primarily to:

Increase the pH of the mud above 11 Increase viscosity and build a filter cake on the borehole wall Reduce the sand content of returns Lower the density of the mud below water

Correct Answer:

Increase viscosity and build a filter cake on the borehole wall

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