AZ ROC A-4 Drilling Practice Questions - Arizona ROC A-4 Drilling Examination Exam

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A drill rig operator tests bentonite mud using a standard Marsh Funnel and a 1-quart measuring cup. If the measured funnel viscosity is 40 seconds, what does this value represent relative to clear water at 70°F?

Clear water takes approximately 26 seconds; 40 seconds indicates moderate fluid viscosity and solids carrying capacity Clear water takes 40 seconds; the mud has the exact viscosity of fresh water Clear water takes 60 seconds; 40 seconds indicates severe fluid thinning Clear water takes 12 seconds; 40 seconds indicates excessive sand content

Correct Answer:

Clear water takes approximately 26 seconds; 40 seconds indicates moderate fluid viscosity and solids carrying capacity

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