A numerical simulation method considering vertical equilibrium mechanism

By conducting a test experiment on the vertical equilibrium time of oil and water on the loose sandstone reservoir, a calculation formula for vertical equilibrium time was established, and the vertical equilibrium mechanism was considered in the numerical simulation, and a multi-scale vertical equilibrium calculation model was constructed, which solved the problem of ignoring vertical equilibrium in the existing technology that caused inaccurate numerical simulation results, and achieved a more accurate description of the motion law of oil and water in the loose sandstone reservoir.

CN118607164BActive Publication Date: 2025-03-25CHINA UNIV OF GEOSCIENCES (BEIJING)
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Patent Information

Application Number
CN202410528167.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-29
Publication Date
2025-03-25
Estimated Expiration
2044-04-29

AI Technical Summary

Technical Problem

The equivalent numerical simulation method in the prior art ignores the vertical equilibrium inside a single grid in a loose sandstone reservoir, resulting in inaccurate numerical simulation results.

Method used

By conducting a test experiment on the vertical equilibrium time of oil and water two phases of loose sandstone reservoir experimental models with different viscosity and oil content combination methods, establishing a vertical equilibrium time calculation formula, and considering the vertical equilibrium mechanism in numerical simulation, constructing a multi-scale vertical equilibrium calculation model, introducing a pressure reconstruction function, and solving the phase saturation distribution and vertical pressure distribution of fine scales.

Benefits of technology

By considering the numerical simulation method of vertical equilibrium mechanism, the two-phase motion law of oil and water in loose sandstone reservoirs can be described more accurately, and the accuracy and reliability of numerical simulation can be improved.

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Abstract

In the technical field of reservoir numerical simulation, the present invention discloses a numerical simulation method considering the vertical balance mechanism, including the following steps: conducting an oil-water two-phase vertical balance time test experiment, analyzing and obtaining a vertical balance time calculation formula; establishing a vertical balance discrimination condition for numerical simulation of loose sandstone reservoirs; constructing a multi-scale vertical balance calculation model; introducing a pressure reconstruction function, and combining the multi-scale vertical balance calculation model to solve in sequence to obtain the coarse-scale phase pressure and fine-scale phase saturation distribution; updating the vertical pressure distribution based on the fine-scale phase saturation distribution. In the present invention, considering the vertical dynamic changes, a fine-scale vertical range one-dimensional domain is added to the two-dimensional domain of the plane after the coarse-scale vertical integration, and a multi-scale vertical balance calculation model is constructed. The numerical simulation of the fine-scale dimension is further optimized through dynamic reconstruction. The numerical simulation method considering vertical balance can more accurately describe the movement law of the oil-water two-phase in the loose sandstone reservoir.
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