Drilling engineering has a diverse range of applications such as sedimentary rock dating, study of the earth's structure, processes happening in inner earth, etc. This book is compiled in such a manner, that it will provide in-depth knowledge about the theories and techniques of drilling. It discusses in detail the varied aspects of drilling such as seismology, types of drilling, methods of drilling, tectonic processes, geochemistry, etc. This book will serve as a reference to a broad spectrum of readers.