How Hot Is the Deepest Part of the IDDP2 Well in Iceland?

Abstract

The target of the RN-15/IDDP-2 well at Reykjanes is to find geothermal resources at supercritical temperatures. The well was drilled down to 4560 m MD (4390 m true depth) and encountered supercritical temperature. Temperature log have been run in the well during drilling, in connection to activities in the well, and during short warm up period in May 2017. During the warm up period, several temperature logs were run in the well down to the bottom of the well measuring temperature at several intervals below 3400 m depth. This data was used to estimate the formation temperature using the Horner-plot method. Even though the warm up period was relatively short, good data was acquired and the estimated temperatures are in good correlation to temperature estimated with other methods, such as modeling using surface geophysical methods. The highest temperature measured in the well was 424 °C at 4560 m MD, while the estimated temperature at that depth is around 540 °C.