The standard method involves percussion drilling in which a drill is alternatively raised and dropped in the descending borehole. It is suited to the drilling of wells in any material from soft clay to the hardest rock.
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[pdf] The checklist combines the applicable requirements of 29 CFR 1910, American National Standards Institute (ANSI) Standards, American Petroleum Institute Recommended Practice 54 (API RP54), other more specific American Petroleum Institute Recommended Practices, and the current and previous checklists for drilling and well servicing rigs generated by the International Association of Drilling Contractors (IADC) and the Association of Energy Service Companies (AESC).
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