Directional Drilling formatIsbn:Softcover 9789048158041 Chapters 1 7 bring previous studies O.P Chapters 1 7 bring previous studies up to date this book was written in response to the need to bring together in one volume contemporary developments in the calculus of variations During the intervening period it has become obvious to many of us that some of the most significant technical advances in the oil business have been made in drilling Indeed it is only after reading his comprehensive book that I realise the extent of my own ignorance of the latest techniques of directional drilling and how desirable it was to have an authoritative text on the subject