Method for detecting gas-liquid diffusion processes by using magnetic resonance imaging (MRI) technique

Abstract

The invention relates to a device and a method for detecting gas-liquid diffusion processes by using an MRI technique, and belongs to the technical field of chemical engineering and petroleum engineering. The device comprises a magnetic resonance imaging system and a dual chamber pressure attenuation system. The magnetic resonance imaging system is provided with a rock core clamper in a magnetic resonance imaging instrument which is electrically connected with a data acquisition and processing system. According to the device and the method for detecting gas-liquid diffusion processes by using the MRI technique, proton density images, longitudinal and transverse relaxation and diffusion tensor distribution images of fluids in porous media can be measured in real time, visually and with no damage through the MRI technique. Quantitative analysis can be performed on porous medium porosity, permeability, saturation level and the like; an improved dual chamber pressure attenuation method can reduce the leakage rate, and confirm the initial gas density conveniently and accurately; and a magnetic suspension balance can monitor gas density changes in real time, and accordingly, deficiencies of traditional dual chamber pressure attenuation methods are compensated.

Description

technical field [0001] The invention relates to a device and a method for detecting a gas-liquid diffusion process using magnetic resonance imaging (MRI) technology, and belongs to the technical fields of chemical engineering and petroleum engineering. Background technique [0002] Accurately grasp the diffusion process of gas in the fluid existing in porous media, which is very useful for evaluating the migration of underground pollutants, coal bed gas migration, gas injection (carbon dioxide, N 2 , light hydrocarbon) flooding to enhance oil recovery, the diffusion loss of underground natural gas storage, and the catalytic reaction speed and efficiency of packed bed reactors in the chemical industry are also of great guiding significance. [0003] In recent years, many test methods have been proposed for the study of the diffusion coefficient of gas in liquid. At present, the single-chamber pressure decay method is mostly used in detection and research. Its advantages are...

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Problems solved by technology

[0004] In addition, due to the complex internal structure of porous media, different diffusion distances, pore space scales, and geometric properties have a great influence on the diffusion process.

At present, the detection and research of the porous media model is still at the stage of overall analysis, and the influence of the heterogeneity and anisotropy of the porous media cannot be fully considered.

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