Drilling in the Permafrost

First published in 1991. This volume presents a brief description of the natural conditions of the permafrost regions, the properties of the permafrost and the processes occurring in it, the fundamentals of the heat transfer processes during drilling and the service temperature conditions of the tool. Methods and devices for cooling the flushing media, principles of quality control of flushing agents and the technology and commercial viability of their use during drilling in the permafrost have been considered. The main emphasis in this book is on the drilling technology which uses a variety of flushing agents. The text also includes a description of the technology of utilizing grouting solutions, the theory and practice of drilling with simultaneous freezing of weakly cohesive, moist ground as well as jdrilling holes in the ice-sheets of the circumpolar regions. This book is intended for engineers and technical personnel engaged in drilling for exploratory geological works.