Cement self-healing as a result of CO2 leakage

Claus Kjøller, Lykourgos Sigalas, Peter Frykman, Ruben Bjørge, Malin Torsæter

Research output: Contribution to journalConference article in journalpeer-review

13 Citations (Scopus)

Abstract

Avoiding CO2 leakages from storage reservoirs is crucial to ensure safe and cost-efficient Carbon Capture and Storage (CCS). This can only be done if effort is made to maintain well integrity throughout the entire life-cycle of a well. Cement integrity is especially important, since the interfaces between cement and rock or casing have been identified as weak links in today's well construction. The present paper focuses on the healing of fractures in well cement when the material is exposed to a CO2-brine water-alternating-gas (WAG) flooding scheme. Specimen characterization using computed tomography combined with electron microscopy documents the self-healing procedure in detail for a composite cement-rock specimen subjected to a WAG flooding scheme. The study revealed volumetric data on self-healing of cement cracks and chemical changes in the specimen as well as in aqueous chemistry upon CO2 exposure. The measured aqueous chemistry suggests CO2-cement interaction to be less pronounced with time thereby together with the observed cement self-healing suggesting that the risk of compromising the safety of a storage site by cement-CO2 chemical reactions is minimal.

Original languageEnglish
Pages (from-to)342-351
Number of pages10
JournalEnergy Procedia
Volume86
DOIs
Publication statusPublished - 1 Jan 2016
Event8th Trondheim Conference on CO2 Capture, Transport and Storage - Trondheim, Norway
Duration: 16 Jun 201518 Jun 2015
Conference number: 8

Keywords

  • cement
  • chemistry
  • experiment
  • leakage
  • scCO
  • self-healing
  • storage safety
  • WAG flooding
  • well integrity

Programme Area

  • Programme Area 3: Energy Resources

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