World Geothermal Congress 2020+1
March - October, 2021

High Temperature Testing of Materials and Corrosion Resistant Coatings for Geothermal Drilling Applications

Erlend Oddvin STRAUME, Gifty Oppong BOAKYE, Beatriz Alonso RODRIGUEZ, Sigrún Nanna KARLSDÓTTIR

[University of Iceland, Iceland]

Through the development and improvement of drilling methods and equipment, the Geo-Drill project aims to save time and reduce costs during drilling of geothermal wells. New materials and corrosion resistant coatings have been tested in a 3 L high pressure and temperature autoclave in the newly installed corrosion laboratory at the University of Iceland at pressure, temperature, and chemical conditions equivalent to those of a geothermal well. The aggressive geothermal environment requires the development of cost-effective corrosion resistant coatings and materials for drilling equipment and instrumentation to increase service life. Materials used in the drilling equipment and sensors, graphene oxide-based coatings, high entropy alloy coatings, and cement and composite based coatings were tested. The corrosion experiments performed in the project were done at two different temperatures; 120 °C and 250 °C, with the autoclave loaded with water vapor and liquid and added CO2 and H2S gas to simulate the geothermal environment. The duration of the tests was 10 and 21 days. Here we report the results from corrosion testing in the autoclave of novel graphene oxide-containing polymer coatings and for comparison low alloyed carbon steel, currently used for drilling components. Microstructural and chemical composition analyses were performed with optical and scanning electron microscope with energy-dispersive X-ray spectroscopy equipment before and after testing to investigate the corrosion resistance of materials.

        Topic: Corrosion and Scaling Paper Number: 27049

         Session 34C: Corrosion and Scaling 7 -- Plants, Drilling and Wells [Tuesday 15th June 2021, 12:00 pm] (UTC-8)
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