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Corrosion Damage of Injection String From the Deep Geothermal Well IDDP-2 in Reykjanes Iceland

Picture for Corrosion Damage of Injection String From the Deep Geothermal Well IDDP-2 in Reykjanes Iceland
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The drilling of the second deep geothermal well drilled in the Iceland Deep Drilling Project (IDDP) at Reykjanes geothermal field was successfully completed in beginning of the year 2017. The previously drilled RN 15 production well 2500 m deep at the Reykjanes high temperature geothermal field was used as the base for the IDDP-2 well. The final depth of the IDDP-2 well reached 4650 m depth with a bottom hole temperature measured to be 427°C and a pressure around 340 bar. This made the bottom of the IDDP-2 well reach fluid at supercritical conditions and become the deepest geothermal well in Iceland. The well was then injected with coldwater for stimulation. During the injection the pumping was interrupted and the water in the well was able to heat up. When the injection string (pipe) was retrieved from the well extensive corrosion damages were apparent on the lowest part of the injection string. Cracks were also observed on a 500-meter interval of the injection string pipe starting from the bottom part. The injection string was visually inspected on-site and selected parts were chosen for further failure analysis. Specimens from the pipe and pipe connections were examined using an optical microscope scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) technique. This was done to investigate and discuss the most probably cause of the corrosion damages. Additionally the hardness of specimens of the pipe were measured and compared to the NACE MR 0175/ISO 15156 standard. This paper covers the procedure and results of the failure analysis of the injection string from IDDP-2 well.

Product Number: 51319-13247-SG
Author: Sigrun Karlsdottir
Publication Date: 2019
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