Method for calculating oil field casing damage under fluid-solid coupling effect

Abstract

The invention discloses a method for calculating oil field casing damage under the fluid-solid coupling effect. The method is based on a fluid-solid coupling theory, research is performed through a method of combining indoor experiments, numerical calculation and theoretical analysis; a seepage flow mathematical model in the petroleum reservoir exploitation process and a stress field calculation mathematical model are established according to the fluid mechanics theory and the elastic-plastic theory, and an elastic-plastic constitutive model of reservoir rock is established according to indoor experiment analysis; and a fluid-solid coupling mathematical model is established by means of the effective stress principle. According to the fluid-solid coupling mathematical model and the solving thinking, a numerical simulation method for reservoir fluid-solid coupling ground stress prediction and casing damage prevention is established on the basis of existing commercial software; with a Qudi oilfield typical block as an example, the concrete method for oil field casing damage prediction and prevention under the fluid-solid coupling effect is given, detailed measures are provided, and the method is of great application value for improving oil field casing damage conditions and prolonging service life of an oil well.

Description

technical field [0001] The invention belongs to the technical field of oilfield equipment, and relates to a method for calculating oilfield casing damage under the action of fluid-solid coupling. Background technique [0002] Casing damage in various oilfields in my country is very serious, and casing damage also exists in foreign countries. According to the literature research at home and abroad in the past 30 years and the dynamic tracking research in the past 10 years, it is found that casing damage is a long-standing problem at home and abroad, and has been Not resolved. For oil fields with water injection production, long-term water injection production changes the initial geological environment of the reservoir, resulting in an imbalance of formation pressure. After the injected water enters the mudstone layer, it will affect the mechanical properties of the mudstone; the injected water enters the fault and induces the fault slippage, etc., all of which make the geolog...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a calculation method for oil field casing damage under the action of fluid-solid coupling, which solves the problem that it is difficult to simulate the stress and deformation process of casing in complex formations in current physical model experiments

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