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In-Situ Erosion-Corrosion Testing Equipment for Geothermal Environment and Comparative Results for T

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Material used in geothermal power plant components can experience damage during direct contact to geothermal steam. This applies specifically to turbines components as they can be prone to erosion and erosion-corrosion due to droplet formation and corrosive species present in the steam. Development of coating material as protection against such damage is being investigated. To test such effects on coatings a device was developed for in-situ testing in geothermal fluid. This device is capable of creating an erosive environment from geothermal fluid through pressure drop created by an orifice. The corrosive species present in the fluid then subsequently lead to the creation of an erosive-corrosive environment. This paper describes the development of the test setup and its potential for creating an adequate environment to test erosion-corrosion experienced by geothermal turbine components. The final setup allows for simultaneous testing of six samples. The variance between the locations of the sample holders in the device was analysed to determine its effect on results for the tested coated samples. This device was used to test different types of coatings among which electric arc sprayed titanium coatings were tested. They were located in different sample holders and their results compared in light of the differences between the environments present in the holders.

Product Number: 51319-13457-SG
Author: Helen Haraldsdottir
Publication Date: 2019
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$20.00
$20.00
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Addressing Integrity Issues in Downhole Equipment by Corrosion Inhibition in Sweet Geothermal Brines

Product Number: 51319-13364-SG
Author: Helmuth Sarmiento Klapper
Publication Date: 2019
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Geothermal resources have been successfully used in the Netherlands for heating districts in agriculture. Due to the high chloride content and the presence of carbon dioxide in some of the geothermal fluids in combination with the intrinsic elevated temperatures these production environments represent a considerable challenge for the integrity of the technical equipment in the geothermal plant. Localized corrosion damage in downhole equipment reported by several operators confirmed the need for a corrosion strategy to mitigate the impact of the aggressiveness of the geothermal fluid under the current operational conditions. To address this a corrosion inhibitor was characterized in the laboratory using a rotating cage to simulate high temperature and high shear stress conditions. Based on the positive outcome of these tests the corrosion inhibitor was successfully implemented in the field. This paper documents the corrosion damage observed in downhole equipment before the use of corrosion inhibition the obtained laboratory test results as well as the experiences from monitoring the field performance of the corrosion inhibitor in this geothermal demanding application.
Picture for Development of New Titanium Products and Alloys for Geothermal Well Casing
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51318-11547-Development of New Titanium Products and Alloys for Geothermal Well Casing

Product Number: 51318-11547-SG
Author: William MacDonald
Publication Date: 2018
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This paper will focus on the laboratory corrosion testing of UNS R53400, R56404 and N06625 in a simulated hypersaline geothermal system, such as found in the Salton Sea KGRA.
Picture for Development of New Titanium Alloys for Use in Aggressive Geothermal Environments
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Development of New Titanium Alloys for Use in Aggressive Geothermal Environments

Product Number: 51319-12871-SG
Author: William MacDonald
Publication Date: 2019
$20.00

The Salton Sea KGRA has long been known for its power generating potential however the corrosivity of the hypersaline fluid has limited power generation as well as the production casing material choices. In the 1990’s titanium grade 29 was utilized very successfully to line nearly all of the energy producing wells in this field. The material proved to be an excellent choice and has given 20-25 years’ service life to date. Despite its excellent performance grade 29 is a high strength titanium alloy that is expensive to manufacture and finish. Recent wells (2012 and beyond) have utilized other materials that were less expensive upfront but appear to be degrading at a much faster rate than the grade 29 titanium alloy. To date these newer wells have required repairs in as little as 2-3 years after start-up. TIMET has recently developed several new alloys that will address both the cost and performance issues seen in this geothermal field. This paper will highlight the corrosion performance of these new alloys along with their more cost effective manufacturing processes.
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