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Portland cement compositions for use in high-temperature, high pressure wells are designed such that the lime-to-silica molar ratio is between 0.5 and 1.0, and the alumina-to-silica molar ratio is between 0.05 and 0.10. After curing and setting at temperatures between 85°C and 300°C, the cement compositions form tobermorite as an initial and permanent calcium silicate hydrate phase.
Portland cement compositions for use in high-temperature, high pressure wells are designed such that the lime-to-silica molar ratio is between 0.5 and 1.0, and the alumina-to-silica molar ratio is between 0.05 and 0.10. After curing and setting at temperatures between 85°C and 300°C, the cement compositions form tobermorite as an initial and permanent calcium silicate hydrate phase.
METHODS FOR CEMENTING THERMAL WELLS
VERFAHREN ZUR ZEMENTIERUNG VON THERMISCHEN BOHRLÖCHERN
PROCÉDÉS DE CIMENTATION DE PUITS THERMIQUE
TERRIER CYRIL (author)
2019-05-15
Patent
Electronic Resource
English
Methods for cementing wells, using foamed cementing compositions
| European Patent Office | 2015