Experimental Study of Wellbore Integrity for CO2 Geological Storage

Montserrat Recasens, S. Garcia, E. Mackay, J. Delgado, M. Mercedes Maroto-Valer

Research output: Contribution to journalArticle

2 Citations (Scopus)
82 Downloads (Pure)

Abstract

Storing CO2 into a suitable underground geological formation is considered the most effective way for a safe and definitive CO2 sequestration. Depleted hydrocarbon reservoirs are potential sites for injection and permanent CO2 storage. The wells drilled which have been duly plugged and abandoned constitute one of the main risks directly affecting permanent and safe CO2 storage, due to possible material deterioration around the wellbore, including the durability of the cement. Therefore, deep abandoned wells represent the greatest risk for potential leakage pathways along the wellbore's structure. Accordingly, a new experimental procedure is proposed here to improve our understanding of reactivity of CO2-brine-well cement systems. For the experimental tests, API Class G cement samples were prepared by following the same industrial cementing process conditions used in the depleted Goldeneye gas condensate reservoir (North Sea). The analysis further shows variations of permeability with confining pressure and depth. The permeability increases with depth, from 2.06 x 10-21 m2 (at 1296 m depth) to 1.17 x 10-20 m2 (at 2560 m depth).

Original languageEnglish
Pages (from-to)5249-5255
Number of pages7
JournalEnergy Procedia
Volume114
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • abandoned wells
  • API Class G cement
  • CO leakage
  • CO sequestration

ASJC Scopus subject areas

  • Energy(all)

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