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

Michal Kruszewski*, Marvin Glissner, Simon Hahn, Volker Wittig

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.
Original languageEnglish
Article number101935
JournalGeothermics
Volume89
Number of pages10
ISSN0375-6505
DOIs
Publication statusPublished - 2021

Keywords

  • EGS
  • Cementing
  • Geopolymers
  • Wellbore integrity
  • Geothermal wellbore completion
  • SHGS (Super-hot Geothermal Systems)

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