Corrosion Inhibitor Evaluation Using Autoclave Electrochemical Measurements in Geothermal Brine

Schott, Tiphaine; Bolmont, M.; Rouand, A.; Liautaud, F.

doi:10.3997/2214-4609.202021010

Cited by 2 publications

(11 citation statements)

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“…Recent autoclave acquisition allowed Schott et al [ 83 ] to measure steel corrosion rate in various brine chemistries at 170°C for a carbon dioxide partial pressure of 2.2 MPa using electrochemical techniques. By comparing short‐term electrochemical measurements with long‐term weight loss experiments, it was demonstrated how the corrosion rate decreased with time at such a temperature.…”

Section: Corrosion In Geothermal Systems and Related Fieldsmentioning

confidence: 99%

“…Other commercially‐available products, with eco‐friendly properties, were shown to be able to decrease steel corrosion rate in the geothermal brine of Rittershoffen at 80°C. [ 83 ] One product was even able to decrease the corrosion rate at 170°C and was considered for on‐site injection. Nevertheless, it was observed that overdosing a product leads to a counter‐intuitive corrosive effect.…”

Section: Mitigating Corrosion With Inhibitorsmentioning

confidence: 99%

“…It was for example found that corrosion of nickel gaskets leads to pollution on steel surfaces. [83] The experiments may be performed in static conditions (most of the studies) or under solution rotation. [64,71] A rotating cage assembly was even proposed.…”

Section: Hthp Electrochemical Measurements-experimental Protocolmentioning

confidence: 99%

“…However, there is a maximal inhibitor concentration for each inhibitor above which the corrosion rate will no longer be decreased [89,104,106,111,122,123] (Figure 10). Therefore, the inhibitor concentration to be added to a system should not be higher than this value to avoid unnecessary costs (or even the corrosive impact of overdosing on some products [83] ), although it was suggested that very high initial inhibitor amounts should be added to build up a protective coating on pipeline metal surface and then the inhibitor should be reduced when this protecting layer is established. [124] Another challenge is managing to quantify remaining inhibitor concentrations in the geothermal fluid for further injection.…”

Section: Geothermal Fluid Of Melunmentioning

confidence: 99%

“…[126] For smaller inhibitor amounts (100 ppm), the efficiencies at 149°C were only 38% for imidazoline and 72% for amide. Among two commercially available products which display reasonable efficiency at 80°C, one was not able to inhibit steel corrosion at 170°C, [83] which is the temperature experienced on-site on the production line. These results highlight the poor efficiency of standard inhibitor compounds at high temperatures, as illustrated in Figure 12.…”

Section: Temperature Rangesmentioning

confidence: 99%

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Monitoring and mitigating corrosion in geothermal systems

Schott

Liautaud

2022

Materials & Corrosion

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In terms of current needs for renewable resources, geothermal energy is one of the future solutions for heat and electricity generation. However, geothermal plants are exposed to very aggressive media (high-temperature [HT], salt-rich fluid, etc.), leading to extensive corrosion of the metallic parts. Should the corrosion inhibitors work at HT, their injection would be mandatory to ensure the reasonable lifetime of geothermal plants. The first part of this review concerns the degradations observed in geothermal plants, which depend on the site properties and the methods for evaluating the corrosion intensity of such systems. Autoclave experiments, although rarely used for geothermal applications, maybe the most appropriate to measure the representative corrosion rate, that is, under use temperature and pressure conditions. In the second part, clues to evaluate the performance and mechanism of corrosion inhibitors are mentioned, and molecules already used to protect steel are reported. However, this review also highlights the lack of data on HT inhibitors, especially for geothermal applications, where the efficiency of a given molecule is strongly related to the real medium. Thus, the protection of new geothermal plants where HT is reached requires the search for products that are stable and efficient under such conditions.Using the heat derived from the Earth's core, geothermal energy constitutes a renewable solution for future energy. It is already widely used worldwide, especially in Europe with several sites in Iceland and in the Dogger aquifer, Paris basin. Additional sites were recently identified, for example, in Upper Rhine Graben, where the composition of the media and use temperatures may differ from the already established plants.However, due to the aggressiveness of geothermal fluids, one major issue is the reduced lifetime of geothermal plants. Indeed, the steel tubes of such | © 2022 Wiley-VCH GmbH.

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Section: Corrosion In Geothermal Systems and Related Fieldsmentioning

confidence: 99%

Section: Mitigating Corrosion With Inhibitorsmentioning

confidence: 99%

Section: Hthp Electrochemical Measurements-experimental Protocolmentioning

confidence: 99%

Section: Geothermal Fluid Of Melunmentioning

confidence: 99%

Section: Temperature Rangesmentioning

confidence: 99%

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Monitoring and mitigating corrosion in geothermal systems

Schott

Liautaud

2022

Materials & Corrosion

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Scale Control in Geothermal Wells – What are the Options for Effective and Economic Scale Management?

Jarrahian,

Mackay,

Singleton

et al. 2024

Day 2 Thu, June 06, 2024

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The drive towards net zero by 2050 has instigated the development of alternative energy sources to fossil fuels which has resulted in a big focus on geothermal energy projects. Geothermal brines typically contain dissolved minerals and gases that can cause scale deposition in wells and topside plant equipment. The presence of scale within a geothermal system can cause various issues leading to decreased efficiency of thermal energy production due to inefficiency of heat exchangers and turbines and the potential for reduced flow capacity in injection wells. In geothermal systems, the conditions and brine chemistry of each geothermal plant can vary greatly, and the selection of a suitable scale management process will be crucial for the sustainable production of geothermal energy. As with all scaling issues in the energy industry, prevention via chemical inhibition and/or chemical removal is the preferable method of dealing with scale compared to costly mechanical removal although non-chemical methods now offer an attractive alternative especially for reducing CO2 footprint. Chemical treatment can be by continuous topside chemical injection, scale squeeze or batch treatment in the injection and/or production wells. The high temperatures of geothermal wells coupled with high water throughput can create quite a challenge for chemical scale control and removal. Any selected scale inhibitor/dissolver will need to be thermally stable to up to 250°C, preferably biodegradable (although this is not essential) and display good efficiency against calcium carbonate and silica/silicate scales. Geothermal brines contain dissolved CO2 and H2S and this can make fluids corrosive so the interaction between scale and corrosion inhibitors will also need to be considered as part of any scale or corrosion management strategy. This may also require modified laboratory test methods, especially for geothermal plants with water re-injection. This paper will review geothermal scale and its mechanisms of formation and will highlight the options available for scale management including both chemical and non-chemical treatments. In addition, the impact of well completion, high water production, corrosion, CO2 footprint and the challenges for chemical treatments in terms of thermal stability and laboratory testing will be discussed.

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Corrosion Inhibitor Evaluation Using Autoclave Electrochemical Measurements in Geothermal Brine

Cited by 2 publications

References 0 publications

Monitoring and mitigating corrosion in geothermal systems

Monitoring and mitigating corrosion in geothermal systems

Scale Control in Geothermal Wells – What are the Options for Effective and Economic Scale Management?

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