Multi-zone polymer injection well injection capability evaluation method according to polymer viscoelasticity

Abstract

The invention relates to a multi-zone polymer injection well injection capability evaluation method according to polymer viscoelasticity. The method comprises 1, building an effective shear rate model of a polymer solution flowing in a rock porous medium, 2, building a polymer solution viscoelasticity apparent viscosity model, 3, constructing conditions of a polymer injection well polymer injection capability evaluation model, 4, building a multi-zone polymer injection well geologic model, and providing model parameters, 5, building a polymer injection well flowing control equation, a multi-zone seepage control equation and polymer injection well and multi-zone contact surface continuity equations, 6, listing polymer injection well and multi-zone boundary conditions, 7, constructing an equation set of the effective shear rate model, the viscoelasticity apparent viscosity model, the polymer injection well flowing control equation, the multi-zone seepage control equation and the polymer injection well and multi-zone contact surface continuity equations, and solving the equation set under different polymer injection well injection pressures, and 8, calculating an injection amount and injection intensity of the result and evaluating the polymer injection well injection capability according to the injection intensity.

Description

Technical field [0001] The invention relates to a method for evaluating the injection capacity of a polymer injection well, in particular to a method for evaluating the injection capacity of a polymer injection well with multiple oil layers considering the viscoelasticity of the polymer in the process of using polymer flooding to develop an oil field. Background technique [0002] At present, polymer flooding has become the main technology for enhancing oil recovery in onshore high water-cut oilfields, and it has also become an important means for enhancing oil recovery in offshore oilfields. In the process of large-scale industrial application of polymer flooding, some technical problems have gradually been exposed. One of the prominent problems is: serious blockage of polymer injection wells, resulting in an unreasonable and sharp increase in injection pressure, resulting in a serious decline in injection capacity and failure of polymer injection wells. The betting is completed...

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Problems solved by technology

[0005] In view of the problems referred to above, the purpose of the present invention is to provide a method for evaluating the injection capacity of polymer injection wells that simultaneously considers the characteristics of polymer viscoelasticity and multi-reservoir, which can quickly and accurately evaluate the injection capacity of polymer injection wells, guide the reasonable allocation of injection in polymer injection wells, and prevent Problems such as formation clogging and injection stoppage

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