Modeling method of stress sensitive damaged hydrocarbon reservoir, damage degree spatio-temporal evolution 4D quantitative and intelligent diagnosis method and system thereof

Abstract

The invention relates to the technical field of oil field exploration, and discloses a modeling method for a reservoir damaged by stress sensitivity and a method and system for determining the damage degree of the reservoir. The modeling method comprises the steps that effective stress borne by a reservoir in a preset area of a to-be-diagnosed well is determined; the flow of fluid in the reservoir is determined according to the pore size distribution characteristics of pores of the reservoir, the diameter and length of each capillary bundle of the reservoir under the effective stress and a fluid flow formula, and each capillary bundle is composed of multiple solid matrixes and pores among the multiple solid matrixes; and according to the permeability model of the reservoir and the flow of the fluid in the reservoir, a spatio-temporal evolution simulation equation of the stress sensitivity damaged reservoir is determined. According to the method, the four-dimensional spatio-temporal evolution process of reservoir damage characteristics caused by stress sensitivity can be quantitatively simulated, so that reservoir damage quantitative prediction and damage law spatio-temporal 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 stress-sensitivity damaged 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, rock typ...

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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