Book excerpt: This book is an expanded and corrected version of the author's "Formulas and Calculation for Drilling Operations - Edition 1" book. It is the most comprehensive practical handbook with calculations and solved problems for drilling operations. This central premise of this book is easy to use step-by-step calculations which can be used by students, lecturers, drilling engineers, consultants, software programmers, operational managers, and researchers. Apart from a basic introductory chapter giving a brief treatment of calculations on rig math, this book consists entirely of problems and solutions on focused topics encountered in drilling operations. 501 solved Problems and calculations will help you to connect relevant engineering theories associated with drilling operations and quickly identify the parameters influencing the operations.