A Visual Evaluation Method of Gel Migration in Rock Microchannels
An evaluation method, microchannel technology, applied in the direction of analysis by nuclear magnetic resonance, etc., can solve problems such as inability to accurately understand fluid migration
Active Publication Date: 2017-05-10
SHANGHAI UNIV
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Problems solved by technology
However, the current traditional core flow experiments can only use the macroscopic parameters of the end or boundary (such as outlet pressure, inlet pressure, flow velocity, etc.) to describe or deduce the flow status and displacement effect of the fluid inside the core.
The core is equivalent to a black box for researchers, and the fluid migration inside it cannot be accurately understood
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[0031] The specific embodiments of the present invention will now be described in conjunction with the accompanying drawings.
[0032] The method for visually evaluating the migration of gel in rock microchannels of this embodiment includes the following steps:
[0033] (1) Turn on the nuclear magnetic resonance equipment, put the water-saturated core into the magnet, and determine the core position through nuclear magnetic imaging to make it in the center of the magnetic field; set the slice thickness of the sagittal and cross-section of the core to 0.7cm and the slice interval Set for 0.1cm and slice position, use low-field NMR equipment to obtain the fluid signal in the rock microchannel in the core displacement experiment;
[0034] (2) Grayscale image extraction. The gray-scale image of the gel in the core was extracted by nuclear magnetic resonance.
[0035] (3) Region of interest (ROI) extraction. A rectangle of 90mm×25mm is extracted as the effective area of the grayscale i...
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Abstract
The present invention relates to a visualization evaluation method of the transportation property of a gel in a rock micro-channel, and belongs to the field of petroleum engineering recovery rate improving technology and experimental fluid mechanics. According to the present invention, the distribution of the gel in the micro-channel is researched by using the low-field nuclear magnetic resonance imaging technology, the distribution of the gel in the porous media micro-channel in the core flooding experiment is directly observed through the nuclear magnetic resonance imaging technology and the T2 spectral analysis technology, the gel image is extracted according to the nuclear magnetic resonance image to obtain the gel area, the gel front edge, the gel rear edge, the gel center and other parameters, and finally the transportation property of the gel in the core is subjected to quantitative characterization by calculating the gel transportation distance and the transportation speed. With the method of the present invention, the transportation property of the gel in the porous media can be intuitively described.
Description
Technical field [0001] The invention relates to a method for visually evaluating the migration of gel in rock microchannels, and belongs to the fields of enhanced oil recovery technology and experimental fluid mechanics in petroleum engineering. Background technique [0002] The core displacement experiment in the laboratory is a recognized method for studying the fluid flow inside the core. It is widely used in the fields of petroleum development and environmental science. However, due to the invisible characteristics of the core, the flow of the fluid in the core can only use pressure Indirectly expressed by the two indicators and flow rate, or indirectly characterized by the use of numerical simulation methods based on the pressure-flow relationship. Low-field nuclear magnetic resonance is a high-tech that has developed rapidly in recent years, and it has been widely used in the medical and food industries. How to make the core displacement process in the laboratory more dire...
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IPC IPC(8): G01N24/08
Inventor 狄勤丰顾春元华帅叶峰张景楠蒋帆王文昌
Owner SHANGHAI UNIV