The Petroleum Engineering Handbook has long been recognized as a valuable, comprehensive reference that offers practical day-to-day applications for students and experienced engineering professionals alike. The Petroleum Engineering Handbook is a series of 7 volumes sold individually or as a complete set. Drilling technology has evolved substantially over the years, from slide rules and hand calculations to advanced computer science and numerical analysis. Volume II: Drilling Engineering, the first drilling content to be included in the Petroleum Engineering Handbook, is intended to provide a snapshot of the drilling state of the art at the beginning of the 21st century.