Durability of Oilwell Cement in CO2-rich Environments

Mohammadreza Bagheri, Seyed Mohammad Shariatipour, Eshmaiel Ganjian

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    Abstract

    The anthropogenic emissions of carbon dioxide (CO2) into the atmosphere is considered as one of the main reasons for global warming. The injection of CO2 into underground formations is an immediate to mid-term option to decrease the level of this gas in the atmosphere. Depleted oil and gas reservoirs are among the best candidates for the carbon capture and storage projects (CCS). The reason for this is based on the well-characterised structure of these type of underground formations through the different periods of their life. One of the most concerned problems associated with CCS projects is CO2 leakage through well cements. Oilwell cements exposed to CO2-bearing fluids undergo geomechanical and geochemical changes which may endanger their integrity. This paper aims at providing a framework to predict the lifespan of a cement exposed to CO2-bearing fluid using numerical modelling based on coupling geochemical and geomechanical processes. The main processes of the radial compaction and the radial cracking are investigated. It was shown that the radial cracking process leads to a definite lifespan of the cement matrix after being exposed to CO2–bearing fluids, while the radial compaction process can increase the durability of the cement matrix. Generally, this process becomes more effective with increasing the radial stress on the cement sheath from the surrounding rocks.
    Original languageEnglish
    Title of host publicationFifth International Conference on Sustainable Construction Materials and Technologies (SCMT5)
    EditorsEshmaiel Ganjian, Mukesh Limbachiya, Nader Ghafoori, Peter Claisse, Mohammadreza Bagheri
    PublisherInternational Committee of the SCMT conferences
    Pages315-329
    Number of pages15
    Volume1
    ISBN (Print)978-1078314435
    Publication statusPublished - 15 Jul 2019
    EventFifth International Conference on Sustainable Construction Materials and Technologies - Kingston upon Thames, United Kingdom
    Duration: 14 Jul 201917 Jul 2019
    Conference number: 5
    https://www.kingston.ac.uk/events/item/2839/14-jul-2019-fifth-international-conference-on-sustainable-construction-materials-and-technologies-scmt5/

    Publication series

    NameSustainable Construction Materials and Technologies
    ISSN (Print)2515-3048

    Conference

    ConferenceFifth International Conference on Sustainable Construction Materials and Technologies
    Abbreviated titleSCMT5
    Country/TerritoryUnited Kingdom
    CityKingston upon Thames
    Period14/07/1917/07/19
    Internet address

    Keywords

    • Cement lifespan
    • Co storage
    • Oilwell cement

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Building and Construction
    • Mechanics of Materials
    • Materials Science(all)

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