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Quantitative Study on Matching Relationship Between a Preformed Particle Gel Particle and a Pore Throat

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

In the process of oil flooding with the preformed particle gel (PPG) systems, the following problems may occur: in the process of injection, the particles may easily settle and block the end face, resulting in the pressure increase, and the matching relationship between the size of a PPG particle and a pore throat in the formation has not been comprehensively quantified. To have a better description of the matching relationship between the median particle size of the dispersed phase and the pore throat diameter of the formation, we have qualified the relationship through the combination of physical simulation and thin-tube experiments. Moreover, based on the principle of compact packing, we have proposed a calculation method of equivalent pore throat diameter, which is more suitable for a sand-filled pipe model. To improve the performance of the system, a polymer and a surfactant additives have been added into the PPG solution. The result indicates that when the pore throat diameter is 1-5 times higher than the median particle size of the dispersed phase, the dispersed phase can enter the pore throat, the plugging rate is over 50%, and the plugging effect is satisfactory. When the pore throat diameter exceeds the median particle size of the dispersed phase by over 12 times, the plugging rate is less than 30%, and the effective residual resistance coefficient cannot be established. To improve the suspension performance of the PPG particles, the polymer agent is added to the solution. In the presence of polymers, the suspension performance of the PPG particles is greatly enhanced. Under the same injection volume, the PPG + polymer + surfactant system shows the highest oil displacement performance.

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Authors and Affiliations

  1. China united coalbed Methane Corporation Ltd., Beijing, China

    Juan Zhao, Yinan Liu & Xinyang Sun

  2. CNOOC Research Institute Co., Ltd., Beijing, China

    Jian Zhang

  3. Institute of Petroleum Engineering, China University of Petroleum, Beijing, China

    Yiqiang Li

Authors
  1. Juan Zhao
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  2. Yinan Liu
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  3. Jian Zhang
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  4. Yiqiang Li
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  5. Xinyang Sun
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Correspondence to Yinan Liu.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 120–126 May–June, 2022.

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Zhao, J., Liu, Y., Zhang, J. et al. Quantitative Study on Matching Relationship Between a Preformed Particle Gel Particle and a Pore Throat. Chem Technol Fuels Oils 58, 561–574 (2022). https://doi.org/10.1007/s10553-022-01420-5

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