Method for quantitatively predicting dynamic permeability of fractured oil and gas reservoir fractures

By using finite element models and artificial fracture creation technology of downhole core samples, combined with permeability relationship charts and imaging logging data, the problem of quantitative prediction of permeability of fractured oil and gas reservoirs was solved, and the accurate prediction of dynamic permeability of fractures was achieved, guiding the formulation of development measures.

CN120688661APending Publication Date: 2025-09-23PETROCHINA CO LTD
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Patent Information

Application Number
CN202410318240.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-03-20
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

Existing technologies are unable to quantitatively predict the dynamic permeability of fractures in fractured oil and gas reservoirs at the reservoir scale. They can only provide qualitative development measures and cannot guide long-term high and stable production.

Method used

By establishing a finite element model and combining artificial fracture creation and confining pressure testing of downhole fracture-free core samples, a permeability relationship chart is obtained. Combined with imaging logging data and effective stress simulation, a fracture permeability-time relationship curve is established to achieve quantitative prediction.

Benefits of technology

The quantitative prediction of the dynamic permeability of fractures in the development process of fractured oil and gas reservoirs is achieved, which guides the formulation of development measures and improves the practicality and operability of the prediction.

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Abstract

The invention relates to the technical field of oil exploration, in particular to a quantitative prediction method for dynamic permeability of fractures of fractured oil and gas reservoirs. According to the method, an underground crack-free rock core sample is adopted for artificial crack forming, and a relation chart of the confining pressure and the actually-measured crack permeability is obtained; the method comprises the following steps: predicting effective stress change in a development process by utilizing actual measurement formation pressure data of a single well, carrying out numerical simulation of effective stress in the development process on the basis of finite element modeling, and determining a relationship between effective stress of a target well and production time; and establishing a relationship between the effective stress of the target well and the fracture permeability in combination with a calculation result of the fracture permeability of the single well imaging logging, and further establishing a relationship between the production time and the fracture dynamic permeability, thereby realizing quantitative prediction of the change of the fracture dynamic permeability in the development process.
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