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51313-02252-Challenges for Metallic Materials Facing HTHP Geothermal Drilling

Picture for Challenges for Metallic Materials Facing HTHP Geothermal Drilling
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Product Number: 51313-02252-SG
ISBN: 02252 2013 CP
Author: Helmuth Sarmiento Klapper
Publication Date: 2013
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Geothermal drilling conditions are severe in terms of corrosion. Highly saline fluids and corrosive gases such as H2S and CO2 are typical of deep hydrothermal aquifers. The combination of this complex chemistry at high temperatures and drilling-related cyclical mechanical stresses significantly affect the performance of metallic materials. Consequently the use of corrosion resistant alloys with appropriate mechanical properties such as high strength stainless steels and precipitation hardening nickel-base alloys is required for geothermal applications. As geothermal wells increase in depth and complexity so too do temperature and cyclic bending loads increase which in turn raise material qualification requirements. Measurements of localized corrosion resistance and corrosion fatigue strength are valuable qualification tests to ensure a safe and reliable operation. This paper outlines some recent approaches for material testing at conditions observed during geothermal drilling and discusses the limits of suitability concerning localized corrosion of select metallic materials in highly saline fluids at high temperature with a view to maximize safety and reliability.

Keywords: geothermal drilling pitting corrosion corrosion fatigue stainless steels nickel base alloy
 

Geothermal drilling conditions are severe in terms of corrosion. Highly saline fluids and corrosive gases such as H2S and CO2 are typical of deep hydrothermal aquifers. The combination of this complex chemistry at high temperatures and drilling-related cyclical mechanical stresses significantly affect the performance of metallic materials. Consequently the use of corrosion resistant alloys with appropriate mechanical properties such as high strength stainless steels and precipitation hardening nickel-base alloys is required for geothermal applications. As geothermal wells increase in depth and complexity so too do temperature and cyclic bending loads increase which in turn raise material qualification requirements. Measurements of localized corrosion resistance and corrosion fatigue strength are valuable qualification tests to ensure a safe and reliable operation. This paper outlines some recent approaches for material testing at conditions observed during geothermal drilling and discusses the limits of suitability concerning localized corrosion of select metallic materials in highly saline fluids at high temperature with a view to maximize safety and reliability.

Keywords: geothermal drilling pitting corrosion corrosion fatigue stainless steels nickel base alloy
 

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