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Stability, Treatment, and Enhance Oil Recovery Ability of Fluorescent Preformed Gel CQDS@PPG, and its Migration Status Study

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
  • Published:
Chemistry and Technology of Fuels and Oils Aims and scope

The application of polymer gels in Enhance Oil Recovery has been developed for years. However, the methods of tracing and positioning them within the layers are lacking. The traditional tracers added into the treatment fluid would be affected by the size, potential, and viscosity differences with polymer gels. As a result, the monitoring results of the tracer and the actual movement of polymer gels are various. Therefore, by synthesizing fluorescent components with polymer gels, driving and tracking are integrated, which can play the role of a tracer while flooding. The stability of the fluorescent CQDs@PPG has been tested under reservoir conditions. The fluorescent peak value of CQDs@PPG would not be affected by swelling, salinity, pH, and temperature. Further, the CQDs@PPG has been used in a specific reservoir condition in east China to test its flooding and treatment ability. The plugging rate of the CQDs@PPG within 1000 mD porous media could reach 90% with a resistant factor Rf of 15 and a residual resistant factor Rff of 10. When applied CQDs@PPG into heterogeneous porous media, the Enhanced Oil Recovery achieved 25.33%. In addition, with the help of a fluorescence spectrophotometer, the concentration of CQDs@PPG in a different position is directly obtained. Finally, the plugging status of the CQDs@PPG has been studied, and the scanning electron microscope images show that it has elastic deformation properties.

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Acknowledgments

This paper is subsidized by the project of the key laboratory of well stability and fluid & rock mechanics in Oil and gas reservoir of Shaanxi Province, Xi’an Shiyou University (No. WSFRM20210402001); Also supported by the Opening Project of Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province (NO. YQKF202010).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, China

    Nanjun Lai & Dongdong Wang

  2. The key laboratory of well stability and fluid & rock mechanics in Oil and gas reservoir of Shaanxi Province, Xi’an, China

    Nanjun Lai, Dongdong Wang & Junqi Wang

  3. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, China

    Nanjun Lai & Dongdong Wang

  4. Sichuan Ruidong (China) Technology Co. Ltd, Chengdu, China

    Lei Tang

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  1. Nanjun Lai
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  2. Dongdong Wang
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Correspondence to Nanjun Lai.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 109–116 November – December, 2022.

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Lai, N., Wang, D., Wang, J. et al. Stability, Treatment, and Enhance Oil Recovery Ability of Fluorescent Preformed Gel CQDS@PPG, and its Migration Status Study. Chem Technol Fuels Oils 58, 1053–1066 (2023). https://doi.org/10.1007/s10553-023-01488-7

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  • DOI: https://doi.org/10.1007/s10553-023-01488-7

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