Method for determining increase range of conglomeratic oil pool polymer flooding injection pressure

Abstract

The invention provides a method for determining an increase range of the conglomeratic oil pool polymer flooding injection pressure. The method comprises the following steps of a, collecting the reservoir thickness h, the injector producer distance r, the wellbore radius rw, the polymer injection viscosity mu and the injection speed q of a polymer injection well group; b, calculating the average permeability k which is an average value of the permeability ki of an injection well and a production well of the polymer injection well group; c, calculating an average heterogeneity coefficient of permeability Tk which is an average value of the heterogeneity coefficient of permeability of the injection well and the production well of the polymer injection well group according to the average permeability k obtained in the step a; d, calculating the increase range delta Pmax of the maximum injection pressure. The method for determining the increase range of the conglomeratic oil pool polymer flooding injection pressure is clear in principle, quantified, strong in operability and convenient to use, avoids determining injection parameters through in-site injection test in the present, solves the problem that different well groups of a conglomerate reservoir use different injection parameters, greatly improves efficiency and saves cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum development reservoir engineering, and in particular relates to a method for determining the increase rate of injection pressure of polymer flooding in conglomerate reservoirs. Background technique [0002] Enhanced oil recovery has become a common concern around the world. With the popularization and application of polymer flooding industrialization, it is undeniable that polymer solution can significantly enhance oil recovery. The basic principle of polymer flooding is to increase the viscosity of the displacement phase, improve the oil-water mobility ratio, and use polymers to reduce the permeability of high-permeability layers in injection wells, thereby expanding the swept volume and improving oil displacement efficiency. Injection pressure calculation is an important part of polymer flooding parameter design, and it is of great significance to rationally formulate polymer flooding process...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a method for determining the increase in injection pressure of polymer flooding in conglomerate reservoirs, so as to solve the problem of the inability to accurately predict the pressure increase and the blindness of injection parameter adjustment in the development process of polymer flooding. Material flooding injection parameter optimization, efficient development provides strong technical support

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