A Decrease of Calcium Carbonate Scaling Potential Due to an Increase of CO2, a 
case study: PGM-29, Miravalles, Costa Rica

Torres, Y.; Rodríguez, A.; Sánchez, E.

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A Decrease of Calcium Carbonate Scaling Potential Due to an Increase of CO2, a case study: PGM-29, Miravalles, Costa Rica

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Torres, Y.
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Rodríguez, A.
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Sánchez, E.
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https://www.geothermal-energy.org/pdf/IGAstandard/WGC/2010/2719.pdf
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Torres, Y., Rodríguez, A., Sánchez, E. (2010): A Decrease of Calcium Carbonate Scaling Potential Due to an Increase of CO2, a case study: PGM-29, Miravalles, Costa Rica - Proceedings, World Geothermal Congress (Bali, Indonesia 2010).

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_2679942

Abstract

Well PGM-29 is located in the southeastern sector of the Miravalles Geothermal Field; in this area all of the wells present high calcium carbonate scaling tendencies. From February 1997 to April 1998 a 5 MWe backpressure unit rented from the Comisión Federal de Electricidad of Mexico (CFE) was installed in this well. During that time, the mass production of PGM-29 was 200 kg/s and the chemical composition of the produce fluid was sodium-chloride-bicarbonate type waters with a content of non-condensable gases in the steam of 5% w/w at 7.0 bar absolute separation. Due to the high scaling potential (1296 kg of CaCO3 per day) dosages of calcium carbonate inhibitor were from 4 to 8 ppm. After several years of being out of commercial production, in January 2007 another 5 MWe backpressure unit owned by ICE (Instituto Costarricense de Electricidad) was installed in PGM-29.