Electric field-assisted high-pressure oil displacement monitoring device and method compatible with nuclear magnetic resonance imaging

By using a combination of a non-metallic high-voltage clamp, a magnetic susceptibility matching electrode, and an electromagnetic compatibility filter network, the electromagnetic compatibility problem of nuclear magnetic resonance imaging during electric field-assisted oil displacement was solved, achieving clear nuclear magnetic resonance imaging and flow field realism under a high-voltage electric field, and providing in-situ visualization monitoring of electric field-assisted oil displacement.

CN121805306BActive Publication Date: 2026-07-03XI'AN PETROLEUM UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI'AN PETROLEUM UNIVERSITY
Filing Date
2026-03-12
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

When electric field-assisted oil recovery technology and nuclear magnetic resonance imaging technology coexist during oil and gas extraction, electromagnetic compatibility issues arise, leading to image artifacts, signal black holes, and a decrease in signal-to-noise ratio, making it impossible to achieve clear and interference-free monitoring.

Method used

The device employs a combined structure of a high-voltage clamp body, a magnetic susceptibility matching electrode system, and an electromagnetic compatibility filter network. The high-voltage clamp body is made of non-metallic materials, the magnetic susceptibility matching electrode system is made of porous conductive composite material, and the electromagnetic compatibility filter network is composed of a non-magnetic inductor and a damping resistor connected in parallel for filtering and noise isolation.

Benefits of technology

Clear nuclear magnetic resonance imaging under high-voltage electric field was achieved, eliminating eddy current interference and background noise, ensuring the authenticity of the flow field and the signal-to-noise ratio, and providing in-situ visualization monitoring of the electric field-assisted oil displacement process.

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Abstract

This invention provides an electric field-assisted high-pressure oil displacement monitoring device and method compatible with nuclear magnetic resonance imaging, belonging to the field of oil and gas extraction monitoring technology. The device includes a high-pressure holder body, a magnetic susceptibility matching electrode system, and an electromagnetic compatibility filter network. The method includes loading a core, baseline acquisition, obtaining a first image through conventional displacement, obtaining a second image by applying an electric field, and comparing and analyzing the electric field utilization. This invention solves the imaging interference problem under the coexistence of strong electric and magnetic fields by using electrode magnetic susceptibility matching, a hydrogen-free insulating medium, and bidirectional filtering isolation, achieving high-resolution in-situ monitoring of the electric field-assisted oil displacement process and quantitative analysis of the degree of remaining oil utilization.
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