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

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A water well contractor is drilling a 400-foot borehole using direct mud rotary in an unconsolidated sand aquifer with a formation fluid pressure of 190 psi. What mud weight is required to maintain a safe hydrostatic head margin without fracturing the formation?
Correct Answer:
9.2 lb/gal

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