Modeling method and system for emulsification blockage damaged hydrocarbon reservoir, and spatio-temporal evolution 4D quantitative and intelligent diagnosis method and system fordamage degree

Abstract

The invention relates to the technical field of oil field exploration, and discloses a modeling method and system for an emulsion blockage damaged reservoir and a method and system for determining the damage degree of the reservoir. The modeling method comprises the steps: determining the Darcy apparent velocity of fluid in a reservoir in a preset area of a to-be-diagnosed well is determined; determining the viscosity of the oil phase according to the temperature field of the reservoir and the function relationship between the viscosity and the temperature of the oil phase in the reservoir; according to the Darcy apparent velocity of the fluid, the viscosity of the oil phase and the emulsification condition of the fluid, determining the radius of an emulsion droplet formed by emulsification of the fluid; and according to the pore size distribution function of the pores of the reservoir and the radius of the emulsified liquid drop, determining a spatio-temporal evolution simulation equation of the emulsified blockage damaged reservoir. According to the method, the four-dimensional spatiotemporal evolution process of reservoir damage characteristics caused by emulsion blockage can be quantitatively simulated, so that reservoir damage quantitative prediction and damage law spatiotemporal deduction are carried out on wells without reservoir damage.

Description

technical field [0001] The invention relates to the technical field of oilfield exploration, in particular to a modeling method and system for emulsification plugging and damage reservoirs and a method and system for determining the degree of reservoir damage. Background technique [0002] In each period of oilfield exploration and development, due to the influence of various internal and external factors, the original physical, chemical, thermodynamic and hydrodynamic equilibrium state of the reservoir will change, which will inevitably make the reservoir near the wellbore wall and even the far wellbore wall The internal permeability of the reservoir is reduced, blocking fluid flow, causing reservoir damage and oil well production decline, or even "shooting" the reservoir. The causes of reservoir damage are diverse and complex, especially during the production process, the reservoir rock storage and seepage space, surface wettability, hydrodynamic field, temperature field, ...

AI Technical Summary

Problems solved by technology

The core flow test method is to understand the degree of damage through the change of permeability before and after core displacement. Although it is more suitable for studying single-factor reservoir damage, it is difficult to reflect the law of reservoir damage on a large scale

In addition, due to the ideal conditions of the indoor core experiment, the cores used for evaluation are all original state cores, and the dynamic changes of reservoir properties cannot be considered, so the experimental results are quite different from the real damage of the downhole reservoir.

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