About the Icelandic Deep Drilling Project (IDDP)
In recent years there has been increased interest in the world towards drilling deeper geothermal wells to obtain more energy output per well with the corresponding higher temperature, pressure and more corrosive geothermal environment. This increases the risk of corrosion damages and thermal shock of the casings due to large thermal stresses and strains that can break the well casings and joints during discharge and quenching. Drilling deeper geothermal wells also means that the strength of the casing becomes one of the limiting factors.
The Gerosion team has gained extensive experience after comprehensive material and corrosion testing in the superheated steam of the IDDP-1 deep drilled geothermal well. Which was the first well in the Icelandic Deep Drilling Project (IDDP) and one of the hottest recorded geothermal well in the world with a wellhead temperature of 450°C and 140 bar pressure.
Further information on IDDP can be obtained from the official website of the project: iddp.is
Supercritical v.s. conventional geothermal wells
If we compare these two well types together, theoretically you have to drill a lot deeper to reach the supercritical zone and in the supercritical well the temperature and pressure are a lot higher. This means that the materials of the wells have to sustain extremely harsh environment and very difficult chemical composition of the steam.
With IDDP-1 a new need has therefore been created for redefined material selection, for both steel and well cement slurries. Further demonstration on comparison can be seen in the video below.