Investigation on low salinity waterflooding through core flooding experiments and numerical simulation

Tomoaki Ishiwata, Masanori Kurihara, Hiroki Taniguchi, Yoshihiro Tsuchiya, Jun Watanabe, Kentaro Matsumoto

    Research output: Contribution to conferencePaper

    1 Citation (Scopus)

    Abstract

    Low salinity water flooding (LSWF) is a relatively new enhanced oil recovery (EOR) technology which has been reported to improve oil recovery in several laboratory experiments and some field trials. LSWF is a very attractive EOR technique in terms of the lowness of operating costs and the smallness of the environmental influences around the reservoirs. Although several mechanisms involved in oil recovery by LSWF have been proposed, the validated mechanisms and the optimum conditions are still uncertain. We conducted the laboratory core flooding experiments in order to evaluate the potential of LSWF and to investigate the possible mechanisms that improve the oil recovery. Berea sandstone cores were flooded with high salinity formation water (FW) followed by low salinity water (LSW). To examine the effects of the compositions of LSW and the effects of the polar oil, LSW and crude oil that have different compositions were used. To investigate the reactions that had possibly happened in a core during water flooding, effluent fluid samples were analyzed for ionic concentrations and pH by using ICP-OES and pH meter, respectively. The results showed that the injection of LSW after FW increased the oil recovery by 7.5 %. Furthermore, in the experiment using the crude oil sample that contained double resin, LSWF improved the oil recovery by up to 15.7 %. However, by the injection of the adjusted LSW (ALSW) that does not contain the divalent cations, the remarkable oil recovery could not be observed. In these experiments, although the pH value and ionic concentration of the effluent fluids were higher than those of the injected LSW and ALSW, suggesting the exchange of ions, LSWF did not improve the oil recovery. In parallel with the experimental work, the numerical simulator that can reproduce the core flooding performances is being developed. The mechanism of LSWF is also examined by the numerical approach using this simulator, which suggested the role of the interaction among divalent cations, polar oil and clay minerals in improving oil recovery by LSWF. The above results reveal that the LSWF should improve the oil recovery when the ionic exchange and the adsorption and desorption between polar oil and clay minerals occurred. Furthermore, the content of polar oil in crude oil and the concentration and compositions of LSW may play a predominant role on the LSW effects.

    Original languageEnglish
    Publication statusPublished - 2016 Jan 1
    Event22nd Formation Evaluation Symposium of Japan 2016 - Chiba, Japan
    Duration: 2016 Sep 292016 Sep 30

    Other

    Other22nd Formation Evaluation Symposium of Japan 2016
    CountryJapan
    CityChiba
    Period16/9/2916/9/30

    Fingerprint

    Well flooding
    flooding
    salinity
    Oils
    Water
    Computer simulation
    simulation
    oil
    experiment
    Experiments
    Recovery
    Petroleum
    crude oil
    water salinity
    enhanced oil recovery
    formation water
    Crude oil
    Divalent Cations
    simulator
    clay mineral

    ASJC Scopus subject areas

    • Geology
    • Energy Engineering and Power Technology
    • Economic Geology
    • Geochemistry and Petrology
    • Geotechnical Engineering and Engineering Geology

    Cite this

    Ishiwata, T., Kurihara, M., Taniguchi, H., Tsuchiya, Y., Watanabe, J., & Matsumoto, K. (2016). Investigation on low salinity waterflooding through core flooding experiments and numerical simulation. Paper presented at 22nd Formation Evaluation Symposium of Japan 2016, Chiba, Japan.

    Investigation on low salinity waterflooding through core flooding experiments and numerical simulation. / Ishiwata, Tomoaki; Kurihara, Masanori; Taniguchi, Hiroki; Tsuchiya, Yoshihiro; Watanabe, Jun; Matsumoto, Kentaro.

    2016. Paper presented at 22nd Formation Evaluation Symposium of Japan 2016, Chiba, Japan.

    Research output: Contribution to conferencePaper

    Ishiwata, T, Kurihara, M, Taniguchi, H, Tsuchiya, Y, Watanabe, J & Matsumoto, K 2016, 'Investigation on low salinity waterflooding through core flooding experiments and numerical simulation' Paper presented at 22nd Formation Evaluation Symposium of Japan 2016, Chiba, Japan, 16/9/29 - 16/9/30, .
    Ishiwata T, Kurihara M, Taniguchi H, Tsuchiya Y, Watanabe J, Matsumoto K. Investigation on low salinity waterflooding through core flooding experiments and numerical simulation. 2016. Paper presented at 22nd Formation Evaluation Symposium of Japan 2016, Chiba, Japan.
    Ishiwata, Tomoaki ; Kurihara, Masanori ; Taniguchi, Hiroki ; Tsuchiya, Yoshihiro ; Watanabe, Jun ; Matsumoto, Kentaro. / Investigation on low salinity waterflooding through core flooding experiments and numerical simulation. Paper presented at 22nd Formation Evaluation Symposium of Japan 2016, Chiba, Japan.
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    title = "Investigation on low salinity waterflooding through core flooding experiments and numerical simulation",
    abstract = "Low salinity water flooding (LSWF) is a relatively new enhanced oil recovery (EOR) technology which has been reported to improve oil recovery in several laboratory experiments and some field trials. LSWF is a very attractive EOR technique in terms of the lowness of operating costs and the smallness of the environmental influences around the reservoirs. Although several mechanisms involved in oil recovery by LSWF have been proposed, the validated mechanisms and the optimum conditions are still uncertain. We conducted the laboratory core flooding experiments in order to evaluate the potential of LSWF and to investigate the possible mechanisms that improve the oil recovery. Berea sandstone cores were flooded with high salinity formation water (FW) followed by low salinity water (LSW). To examine the effects of the compositions of LSW and the effects of the polar oil, LSW and crude oil that have different compositions were used. To investigate the reactions that had possibly happened in a core during water flooding, effluent fluid samples were analyzed for ionic concentrations and pH by using ICP-OES and pH meter, respectively. The results showed that the injection of LSW after FW increased the oil recovery by 7.5 {\%}. Furthermore, in the experiment using the crude oil sample that contained double resin, LSWF improved the oil recovery by up to 15.7 {\%}. However, by the injection of the adjusted LSW (ALSW) that does not contain the divalent cations, the remarkable oil recovery could not be observed. In these experiments, although the pH value and ionic concentration of the effluent fluids were higher than those of the injected LSW and ALSW, suggesting the exchange of ions, LSWF did not improve the oil recovery. In parallel with the experimental work, the numerical simulator that can reproduce the core flooding performances is being developed. The mechanism of LSWF is also examined by the numerical approach using this simulator, which suggested the role of the interaction among divalent cations, polar oil and clay minerals in improving oil recovery by LSWF. The above results reveal that the LSWF should improve the oil recovery when the ionic exchange and the adsorption and desorption between polar oil and clay minerals occurred. Furthermore, the content of polar oil in crude oil and the concentration and compositions of LSW may play a predominant role on the LSW effects.",
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    AU - Ishiwata, Tomoaki

    AU - Kurihara, Masanori

    AU - Taniguchi, Hiroki

    AU - Tsuchiya, Yoshihiro

    AU - Watanabe, Jun

    AU - Matsumoto, Kentaro

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