Evaluation method for minimum miscible pressure of carbon dioxide and shale oil under confinement effect

Through molecular simulation and data processing technology, the minimum mixed pressure of carbon dioxide and shale oil under the boundary effect is calculated, which solves the problem of the inability to accurately calculate this problem in the existing technology, and achieves efficient and accurate pressure calculations, providing important theoretical support for oil extraction.

CN119538610AActive Publication Date: 2025-02-28CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202510105182.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-23
Publication Date
2025-02-28
Estimated Expiration
2045-01-23

AI Technical Summary

Technical Problem

The prior art is difficult to accurately calculate the minimum mixed pressure of carbon dioxide and shale oil under the limiting effect, and traditional methods cannot effectively solve this problem in nanoscale reservoir pores.

Method used

By constructing a molecular model, describing the interaction forces between molecules and within molecules, dividing the simulation region and boundary conditions, determining the simulation parameters and calculation parameters, performing molecular simulations to calculate the interaction energy, and processing the data through interpolation and Gaussian fitting, first-order central differential operation is used to obtain the minimum mixed phase pressure.

Benefits of technology

The minimum mixed pressure of carbon dioxide and shale oil is accurately and efficiently calculated under the boundary effect, overcoming the difficulty of traditional methods in determining mixed pressure, and providing a theoretical basis to optimize the oil flooding scheme and improve recovery rate.

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Abstract

The invention discloses a method for evaluating the minimum miscible pressure of carbon dioxide and shale oil under a confinement effect, and belongs to the field of minimum miscible pressure measurement. The technical scheme comprises the following steps: constructing a molecular model; selecting force field parameters, and describing interaction force between molecules and in the molecules; dividing simulation areas and boundary conditions; determining simulation parameters and calculation parameters, and performing molecular simulation on the molecular model; and calculating the minimum miscible pressure according to the interaction energy. The method is applied to the aspect of determining the minimum miscible pressure of the carbon dioxide and the shale oil under the confinement effect, the technical problem that the miscible pressure of the two-phase interface of the carbon dioxide and the shale oil under the confinement effect cannot be accurately calculated through an existing calculation method is solved, and the minimum miscible pressure of the carbon dioxide and the shale oil under the confinement effect can be accurately and efficiently calculated.
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Citation Information

Patent Citations

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