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Mechanism of Imbibition in Shale Pores Based on Imbibition Nuclear Magnetic Experiment and LBM Method

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Chemistry and Technology of Fuels and Oils Aims and scope

The spontaneous imbibition of fracturing fluid in the shale matrix is one of the main reasons for the low hydraulic fracturing flowback rate. The distribution characteristics of fracturing fluid in the shale spontaneous imbibition process are studied by the low field nuclear magnetic resonance (NMR) method. An improved pseudo-potential lattice Boltzmann model is proposed to simulate the spontaneous imbibition behavior in a three-dimensional porous shale structure. The results show that the viscosity, sample length, and permeability of the imbibition solution have an important influence on the imbibition characteristics of the samples. In the imbibition process based on the SC-LBM model, due to the capillary force effect, the imbibition liquid preferentially enters the larger pores of the wetting phase and then gradually distributes in the adjacent pores.

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Acknowledgments

The study has been performed with the financial support of the National Key R & D Program of China (2016YFC0600705), National Major Project for Science and Technology of China (2017ZX05003-006), National Natural Science Foundation of China (Grant No. U1562217, 51679251, 51727807), China Postdoctoral Science Foundation (Grant No. 2017M610877), and National Science and Technology Major Project on Oil and Gas (No.2017ZX05013001).

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Authors and Affiliations

  1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, 834000, China

    Hongjie Cheng, Jigang Zhang & Runxi Leng

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Shilei Chang

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  1. Hongjie Cheng
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  2. Jigang Zhang
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  3. Runxi Leng
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  4. Shilei Chang
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Correspondence to Runxi Leng.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 100 — 105, March — April, 2021.

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Cheng, H., Zhang, J., Leng, R. et al. Mechanism of Imbibition in Shale Pores Based on Imbibition Nuclear Magnetic Experiment and LBM Method. Chem Technol Fuels Oils 57, 387–395 (2021). https://doi.org/10.1007/s10553-021-01257-4

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