The field of petroleum engineering has changed radically the past decade. The easy oil is produced, and new discoveries are often found at challenging locations. Examples are deeper waters, high pressure and high temperature regimes and at offshore locations. This put higher demands on the design and the execution of the drilling operations.Pipe buckling is an issue that has many aspects. For extended reach and horizontal wells the string is sometimes put in compression. Too high axial force leads to stuck pipe and casing. In particular coiled tubing operations suffers from buckling constraints. There is no doubt that the buckling of oil well tubulars is one of the key challenges for future advanced wells.A number of publications are written on pipe buckling. However, readers may become confused because the models often looks similar, but with a different scaling factor. Which solution is correct and which is wrong? The answer is that they are all correct based on their assumptions. Furthermore, most of the published literature assumes a frictionless environment, and, they assume perfectly straight and symmetric tubulars. This indicates that there is still work required to arrive at buckling models applicable for real wells.Dr. Mesfin Belayneh analyzed published buckling literature to sort out these issues. The results are presented in this book. He has systemized the various approaches in a clear and concise way. This makes this book even more important; it can be used to build new and more realistic models in the future. Furthermore, the book contains new models never published before. I foresee that new or revised buckling solutions will be published in the years to come, with this book as an important reference.Bernt S. Aadnoy, PhD Professor of Petroleum Engineering University of Stavanger