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Corrosion Scaling and Material Selection in Deep Geothermal Wells – A Case Study of IDDP-2

In order to make the world’s energy consumption sustainable there is a need for reducing emissions of CO2 and to shift towards renewable energy sources. Geothermal energy has a large potential in certain parts of the world. One example is Iceland where the reservoir in IDDP-2 is around 450°C and 270 bar. This makes it attractive as a geothermal reservoir of high enthalpy supercritical water with the potential for conversion of large amounts of environmentally friendly energy.The IDDP-2 geothermal well has not been produced yet and hence the fluid composition is not known. Using available data for nearby wells and in particular IDDP-1 an estimate can still be made. A combination of high temperature and pressure the presence of corrosive agents (such as HCl and H2S) a low pH and (at least initially) reducing conditions gives rise to challenges related to materials selection.This paper summarizes part of a desktop case study that addresses corrosion and scaling issues for conditions relevant for the IDDP-2 geothermal well. Based on measured water pressure a depth of 4500 meters and assuming a hydrostatic model is valid the temperature and pressure profile along the well is estimated. Knowledge gaps such as lacking solubility data and corrosion rates at supercritical conditions are pointed out.

Product Number: 51319-13299-SG
Author: Morten Tjelta
Publication Date: 2019
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