The Icelandic Deep Drilling Project (IDDP) is a research program designed to evaluate improvements in the efficiency and economics of geothermal energy systems by harnessing Deep Unconventional Geothermal Resources. The goal is to generate electricity from natural supercritical hydrous geofluids from depths of around 3.5 to 5 km and temperatures of 450-600 C. In order to drill into the target zone of supercritical geofluids, one of the main challenges is to deal with high temperatures and pressures. This book describes geological and technical risks, in terms of drilling, in such an extreme...