Determination method for conglomerate oil reservoir polymer-flooding relative permeability curve

Abstract

The invention provides a determination method for a conglomerate oil reservoir polymer-flooding relative permeability curve. The determination method comprises the following steps that 1, the total water cut fw of a polymer-flooding oil well is calculated; 2, a first-level linear fitting relational expression y1=ax+b is established, and fitting parameters a and b are obtained; 3, the polymer-flooding oil-water relative permeability ratios Kro/Krw under different polymer-flooding water saturations Sw are calculated according to a relational expression Kro/Krw=me<-nSw> between the relative permeability and the polymer-flooding water saturations; 4, a second-level linear fitting relational expression y2=k1x1+k2x2+k3 is established, and fitting parameters k1, k2 and k3 are obtained; 5, the oil-water two-phase relative permeability Kro and Krw under the different polymer-flooding water saturations Sw are calculated; 6, a polymer-flooding oil-water two-phase relative permeability curve is drawn. According to the determination method for the conglomerate oil reservoir polymer-flooding relative permeability curve, the more precise conglomerate oil reservoir polymer-flooding relative permeability curve can be quickly obtained, the cost is reduced, the efficiency is high, and the workload is greatly decreased.

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 relative permeability curves of polymer flooding in conglomerate reservoirs. Background technique [0002] Conglomerate reservoirs have different sedimentary properties from conventional sandstone reservoirs, conventional physical properties, complex pore structure, and serious heterogeneity on the plane and vertical section, which brings great difficulty to the development of conglomerate reservoirs . The permeability of conglomerate reservoirs is one of the important contents of reservoir development evaluation. The relative permeability curve reflects the change law of the seepage capacity of each phase fluid in the oil layer, and is an important index to predict the development and production indicators and dynamic changes of oilfields. [0003] During the process of polymer flooding in conglomerate res...

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Problems solved by technology

[0008] Aiming at the above technical problems, in order to describe the relative permeability curve of polymer flooding in conglomerate oil reservoirs, using the development data of conglomerate oil reservoirs, the present invention provides a method for determining relative permeability curves of polymer flooding in conglomerate oil reservoirs. Calculate the relative permeability curve of conglomerate reservoirs for polymer flooding to accurately characterize the dynamic characteristics of conglomerate reservoirs, overcome the shortcomings of the large deviation between the effective permeability of the laboratory core and the actual formation effective It is of great practical significance to establish an effective permeability calculation model based on the characteristics of strong heterogeneity to provide effective support for oilfield development prediction

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