51313-02550-Corrosion Testing Downhole in Sour High Temperature Geothermal Well in Iceland

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Product Number: 51313-02550-SG

ISBN: 02550 2013 CP

Author: Sigrun Karlsdottir

Publication Date: 2013

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Corrosion tests of various metal alloys were carried out in a high temperature sour geothermal well in Krafla. The tests were done following a failure analysis of a broken liner from the well. The failure analysis revealed that the liner was severely corroded and parts of it situated at 1600 m depth had experienced hydrogen damage in the form of hydrogen embrittlement. The corrosion tests were done in the down-hole geothermal environment. Two identical test racks were made and exposed to the down-hole geothermal environment for two different periods of time (4 days and 14 days). The following materials were tested: API-K55 TN-95 13Cr SAF 2507 254 SMO Sanicro 28 and SM 2550. The corrosion resistance of the alloys that were tested was measured and elongation at brake was measured to evaluate the susceptibility of the materials to hydrogen damage. The chemical composition and structure of the corrosion scales that formed on the samples during testing were analyzed. Majority of the materials tested had decrease in elongation at brake both after 4 days and 14 days in the down-hole geothermal environment. The corrosion rates were above acceptable limits for the carbon steels API-K55 and TN-95 and the stainless steel 13Cr. The stainless steels 254 SMO SAF 2507 Sanicro 28 and the nickel alloy SM 2550 all measured with corrosion rates below the acceptable limits (0.1 mm/year). The results from the corrosion testing and analysis are described and discussed in this paper.