Study on the Variation Law of Relative Permeability Curves of Water Flooding Polymer Flooding and ASP Flooding

The relative permeability curves of Water flooding describe the movement law of oil and water in the process of Water flooding reservoir development, the application of relative permeability curves can calculate the dynamic state of reservoirs, water cut, water cut rise speed, etc., and play an important guiding role in the development of water flooding oil reservoirs. With the rise of Polymer flooding ASP flooding and other tertiary oil recovery methods, the chemical flooding relative permeability curves are also needed to guide the tertiary oil development. With all kinds of variety factors, it is difficult to measure the relative permeability curve of Polymer flooding and ASP flooding, and there are few results for application. In response to the above issue, the relative permeability curves of Water flooding Polymer flooding and ASP flooding are measured by a non-steady method in this paper. And the relative permeability curves of different displacement ways of the same rock core are compared. Draw the following conclusion: Since the polymer viscosity is higher than the viscosity of water, the ratio of the viscosity of the displaced and displacing phases is narrowed, and the affected volume is slightly expanded, residual oil saturation is slightly reduced, curvature radius of the oil phase relative permeability curve is reduced, water phase relative permeability is reduced; The viscosity of the ASP flooding is slightly lower than that of the Polymer flooding, but the interfacial tension is reduced, resulting in ASP flooding the residual oil saturation is significantly reduced, the two-phase permeable zone is greatly expanded, curvature radius of the oil-phase relative permeability curve is reduced, greater than Polymer flooding amplitude, water phase relative permeability is reduced, but less than Polymer flooding. According to the variety characteristics of the relative permeability curves of Water flooding Polymer flooding and ASP flooding, the ratio of the viscosity of the displacing and displaced phases (or the displaced and displacing phases) has been returned, and established the quantitative relationship in the Willhite model’s index, and the quantitative relationship with the maximum value of water-phase permeability, and develop an improved Willhite model, hence, can be obtained by the known water flooding relative permeability curves, calculate the relative permeability curves of Polymer flooding and ASP flooding, solving the problem of few permeability curves for application in chemical flooding process.