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Development of a Corrosion Inhibitor Formulation for Acid Cleaning of Geothermal Wells

Calcium carbonate and other mineral scales form in geothermal wells leading to reduced efficiency and sometimes well closure. Hydrochloric acid is used to dissolve carbonate scales and improve efficiency. This acid is very aggressive to the underlying metal which is typically steel. Corrosion inhibitors are typically added to the acid in order to reduce the corrosion rate. This paper describes the development of a corrosion inhibitor formulation which reduced the corrosion rate of steel in 15% hydrochloric acid. A number of inhibitors were screened to select the best performing compounds. Combinations of inhibitors were also tested to look for synergies. The results showed that a tertiary combination of inhibitors provided superior protection to any single inhibitor alone.

Product Number: 51319-13376-SG
Author: Michael Todd
Publication Date: 2019
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