The characteristics of oil-water two-phase flow in low-permeability reservoirs have been insufficiently studied. In the present article, we estimate the oil-water seepage parameters using a flow stress gradient model with a nonuniform radial distribution of the water saturation coefficient in a low-permeability reservoir. We apply the oil-water relative permeability curves and the Buckley-Leverett equation to determine the oil-water mobility ratio and the functional relationship between the two-phase flow stress gradient, the radial distribution, and the oil saturation. In this way, we construct an oil-water radial flow model based on the oil-water two-phase flow stress to derive the pressure distribution equation. Calculation results show that there is a linear relationship between the oil-water two-phase flow stress gradient and the oil saturation and a quadratic relationship between the oil-water two-phase mobility ratio and the oil saturation. The strata/ pressure distribution for low-permeability reservoirs is highly sensitive to the oil-water two-phase flow stress gradient, and the effect is more noticeable near the wellbore.
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Acknowledgements
The authors wish to express their appreciation to the National Innovation and Entrepreneurship Training Program for College Students (Grant 201510710064), The Yan'an Municipal Bureau of Science and Technology Project: Research and Demonstration Extension of Key Technologies for Improving Oil Recovery ( Project No. 2017WZZ - 01 - 02 ), Project of Yan'an University for Support of Young Scientists: Optimization of Air-Foam Flooding Parameters for Low-Permeability and High Water Content Reservoirs (Grant YDQ2017 - 21).
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 53 — 56, March — April, 2019.
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Tianjin, Z., Xinping, Y., Xuecheng, Y. et al. Deriving the Oil-Water Seepage Pressure Distribution from Two-Phase Oil-Water Flow Stress Gradient. Chem Technol Fuels Oils 55, 199–205 (2019). https://doi.org/10.1007/s10553-019-01021-9
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DOI: https://doi.org/10.1007/s10553-019-01021-9