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Alkali-activated aluminosilicate sealing system for deep high-temperature well applications

: Kruszewski, M.; Glissner, M.; Hahn, S.; Wittig, V.

Volltext ()

Geothermics 89 (2021), Art. 101935, 10 S.
ISSN: 0375-6505
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IEG ()

This study proposes potential replacement for the Portland-based cement, which is a common sealant used in deep high-temperature geothermal wellbore completions. The experimental laboratory studies were focussed on alkali-activated aluminosilicates. It was proven, that the so-called, geopolymer-based sealing systems exhibit high compressive and flexural strength at elevated temperatures, good resistance towards thermal cyclic loading, high ductility, acid insensitivity, and improved water permeability. Additionally, alkali-activated aluminosilicate sealing systems are economically feasible and their CO2 emission, during the manufacturing process, is significantly lower in comparison with the conventional Portland-based cement types, making them an environmentally friendly option for deep wellbore completions in unconventional high-temperature geothermal systems.