Method for evaluating reservoir scaling during water flooding, and application and device thereof

By simulating the displacement process and analyzing the ion concentration and solid phase particle size distribution of the experimental fluid, the problem of scaling pollution in carbonate reservoirs during water injection development is solved, and the accurate evaluation and prediction of the scale condition of the reservoir is achieved, guiding water injection development and reducing pollution and blockage.

WO2025077598A1 Publication Date: 2025-04-17CHINA NAT PETROLEUM CORP
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Patent Information

Application Number
PCT/CN2024/121703
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-10-10
Filing Date
2024-09-27
Publication Date
2025-04-17

AI Technical Summary

Technical Problem

During the water injection development process of carbonate reservoirs, due to the chemical reaction between high hydrochloric acid production water and reservoir fluid, the reservoir scale and pollution are caused. The existing evaluation methods cannot effectively monitor the blockage situation online and evaluate the impact of pipe corrosion and water quality compatibility on the reservoir.

Method used

A reservoir scaling evaluation method is provided during water injection. By obtaining the ion concentration and solid phase particle size distribution of the experimental fluid, simulating the displacement process, measuring the multi-point pressure and permeability changes of the core, analyzing the ion concentration changes and solid phase particle size changes, to evaluate the reservoir scaling situation.

Benefits of technology

This method can effectively evaluate the location, degree of reservoir scale and its impact on reservoir permeability, provide accurate data to guide water injection development, reduce pollution and blockage, and improve development efficiency.

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Abstract

Provided are a method for evaluating reservoir scaling during water flooding, and an application and device thereof. The method comprises: acquiring the ion concentration, cumulative distribution of solid phase particle size counts, and core permeability before displacement; acquiring the multipoint pressure and core permeability of a core, cumulative distribution of solid phase particle size counts, and ion concentration during and / or after the displacement; acquiring ion concentration change, the minimum retained particle size within the core, scaling location, and the degree of core damage; completing evaluation of reservoir scaling during water flooding.
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