Tight oil reservoirs are characterized by low porosity, low permeability, small seepage channels (micro-nano-scale pore development), and low pressure coefficient. The existing development technology can not solve the problems of low output, fast decline, difficulty in replenishing energy, and low recovery ratio. In this paper, the T2 spectrum of saturated oil samples is detected by NMR analyzer, and the spontaneous imbibition and pressurized imbibition experiments are carried out with deuterium water. By scanning the T2 spectrum of nuclear magnetic resonance, the peak value of T2 spectrum decreases with the imbibition process, which indicates that the oil in the core is gradually imbibed, and the change trend of spontaneous imbibition quality is basically consistent with that of the spectral area. The experimental results show that the effects of soaking wells on the oil recovery of different wells are obviously different. There are many factors that affect the effect of well soaking, including porosity, permeability, mineral composition, and so on, which together affect the final effect of the well soaking. From the experimental results, the clay minerals in the core, especially the illite-montmorillonite mixed layer, have an obvious influence on the imbibition rate. The higher the content of the illite-montmorillonite mixed layer, the faster the imbibition rate. This study is of great significance for the development of the tight oil.
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 1, pp. 172–175 January – February, 2022.
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Zhenping, L., Ming, Q., Jigang, Z. et al. Mechanism and Adaptability Evaluation of Well Soaking in Tight Reservoir. Chem Technol Fuels Oils 58, 181–184 (2022). https://doi.org/10.1007/s10553-022-01365-9
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DOI: https://doi.org/10.1007/s10553-022-01365-9