Hybrid eor technology: Carbonated water-smart water flood improved recovery in oil wet carbonate formation: Part-ii

Alibi Kilybay, Bisweswar Ghosh, Nithin Chacko Thomas, Nuhu Turosung Sulemana

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

    18 Scopus citations

    Abstract

    Search for an alternative, cheap and environmental friendly EOR method has resulted in the development and subsequent field implementation of Smart Water Injection (SWI) and CO2 injection (COI). Though miscible COI has multi-fold advantages, carbonated water injection (CWI) may surpass COI in terms of volume requirement and efficiency. This research work is intended to investigate the advantages of combined application of SWI & CWI in terms of reduced residual saturations in oil wet carbonate formation. In order to measure the recovery efficiency, core flooding experiments are conducted with SWI as tertiary recovery following sea water as secondary recovery mode. This is followed by quaternary recovery using carbonated smart water (CSWI), i.e. smart water saturated with CO2. Three high potential smart water compositions are screened and the best one is chosen for the recovery studies. Produced water samples are analyzed using ICP-MS. The higher recovery efficiency of CSWI are analyzed in support of the NMR porosity distribution, interfacial tension and zeta-potential studies. The underlying physical processes and the pore-scale mechanisms of fluid-fluid and fluid-solid interactions during SWI-CWI are explained in terms of surface potential, electrical double layer, oil swelling factor, droplet coalescence, wettability alteration and flow diversion due to fluid redistribution within the pore network. Core flooding results showed that tertiary recovery with SWI resulted in 4.8 - 9.5% recovery, whereas the quaternary recovery with CSWI resulted in 5.7 % to 13.6% additional oil. From this study it is established that CSWI could be a promising EOR technique among the latest EOR methods. CSWI has an advantage over COI due to the fact that it exists as a dissolved gas instead of free phase. It reduces the requirement for high pressure injection system, the problems of gravity segregation and poor sweep efficiency. A hybrid of CWI with SWI can make it an effective EOR solution with significant cost advantage, higher oil recovery in addition to the environmental benefits of CO2 sequestration.

    Original languageBritish English
    Title of host publicationSociety of Petroleum Engineers - SPE Oil and Gas India Conference and Exhibition 2017
    Pages552-569
    Number of pages18
    ISBN (Electronic)9781510842021
    DOIs
    StatePublished - 2017
    EventSPE Oil and Gas India Conference and Exhibition 2017 - Mumbai, India
    Duration: 4 Apr 20176 Apr 2017

    Publication series

    NameSociety of Petroleum Engineers - SPE Oil and Gas India Conference and Exhibition 2017

    Conference

    ConferenceSPE Oil and Gas India Conference and Exhibition 2017
    Country/TerritoryIndia
    CityMumbai
    Period4/04/176/04/17

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