Low-salinity water-alternating-CO2 flooding enhanced oil recovery: Theory and experiments

Tadesse Weldu Teklu, Waleed Alameri, Ramona M. Graves, Hossein Kazemi, Ali M. Alsumaiti

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    27 Scopus citations

    Abstract

    Carbon dioxide flooding is currently the most technically and economically viable enhanced oil recovery (EOR) process in carbonate and sandstone reservoirs. Low-salinity waterflood is a relatively new EOR process; and our experiments in carbonate cores show significant oil recovery improvements. We propose a new EOR process to improve economics, which involves low-salinity water-alternating-CO2 (LS-WAG) injection. To evaluate the proposed idea, three core floods and several contact angle and IFT measurements were performed. The core floods include: seawater flood, followed by low-salinity waterflood, followed by CO2 injection, which yielded fourteen, twenty-five, and thirty-eight percent additional oil recovery by CO2 from two carbonate and one sandstone experiments. We performed contact angle measurements on several low-permeability carbonate, mediumpermeability Berea sandstone, and ultra-low permeability Three Forks mudstone core discs using different salinities. The contact angle measurements confirmed that favorable wettability alteration is achievable with the proposed EOR process. In addition, visual observations suggested that the proposed EOR process could be effective for cleaning the matrix-fracture interface in conventional and unconventional reservoirs. IFT measurments and modeling relevant to the EOR process is also included in this study.

    Original languageBritish English
    Title of host publicationSociety of Petroleum Engineers - 30th Abu Dhabi International Petroleum Exhibition and Conference, ADIPEC 2014
    Subtitle of host publicationChallenges and Opportunities for the Next 30 Years
    Pages893-916
    Number of pages24
    ISBN (Electronic)9781634398053
    DOIs
    StatePublished - 2014
    Event30th Abu Dhabi International Petroleum Exhibition and Conference: Challenges and Opportunities for the Next 30 Years, ADIPEC 2014 - Abu Dhabi, United Arab Emirates
    Duration: 10 Nov 201413 Nov 2014

    Publication series

    NameSociety of Petroleum Engineers - 30th Abu Dhabi International Petroleum Exhibition and Conference, ADIPEC 2014: Challenges and Opportunities for the Next 30 Years
    Volume2

    Conference

    Conference30th Abu Dhabi International Petroleum Exhibition and Conference: Challenges and Opportunities for the Next 30 Years, ADIPEC 2014
    Country/TerritoryUnited Arab Emirates
    CityAbu Dhabi
    Period10/11/1413/11/14

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