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A visual evaluation method of gel retention in rock microchannels

An evaluation method and retention technology, applied in image data processing, measurement devices, suspension and porous material analysis, etc., can solve problems such as inability to accurately understand fluid movement

Active Publication Date: 2017-10-24
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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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 rock core is equivalent to a black box for researchers, and it is impossible to accurately understand the fluid movement inside it

Method used

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  • A visual evaluation method of gel retention in rock microchannels
  • A visual evaluation method of gel retention in rock microchannels
  • A visual evaluation method of gel retention in rock microchannels

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Embodiment Construction

[0027] Now the specific embodiment of the present invention in conjunction with accompanying drawing is described in the following.

[0028] A kind of visual evaluation method of the retention of gel in the rock microchannel of the present embodiment, the test procedure is:

[0029] (1) Turn on the nuclear magnetic resonance equipment, put the water-saturated core into the magnet, determine the position of the core through nuclear magnetic imaging, so that it is in the center of the magnetic field; set the slice thickness of the sagittal plane and cross section of the core to 0.7cm, and set the slice interval Set for 0.1cm and slice position, and use low-field nuclear magnetic resonance equipment to obtain fluid signals in rock microchannels in core displacement experiments;

[0030] (2) Grayscale image extraction. Grayscale images of the gel in the core were extracted by NMR.

[0031] (3) Region of interest (ROI) extraction. Extract a 90mm×25mm rectangle as the effective a...

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Abstract

The present invention relates to a visualization evaluation method of retention of gel in rock microchannel, and belongs the field of petroleum engineering enhanced oil recovery technology and experimental fluid mechanics. The invention uses a low-field magnetic resonance imaging technology to study the gel distribution in microchannel; magnetic resonance imaging technique and T2 spectral analysis technique are employed for direct observation of distribution of gel in a porous media channel in a core displacement experiment; then a gel image is extracted according to MRI image, so as to obtain the parameters including gel area, gel leading edge, gel trailing edge and gel center; and finally, the retention ratio of the gel is calculated, in order to quantitatively characterize the retention of gel in the core. The method can visually describe the characteristics of retention of gel in porous media.

Description

technical field [0001] The invention relates to a visual evaluation method for the retention of gel in rock microchannels, and belongs to the fields of petroleum engineering enhanced oil recovery technology and experimental fluid mechanics. Background technique [0002] The core displacement experiment in the laboratory is a recognized method for studying the fluid flow inside the core, and is widely used in petroleum development and environmental science. However, due to the invisible characteristics of the core, the fluid flow in the core can only be controlled by pressure It can be expressed indirectly by the two indexes of flow rate and pressure, or it can be represented indirectly by numerical simulation method according to the relationship between pressure and flow rate. Low-field nuclear magnetic resonance is a high-tech that has developed rapidly in recent years, and has been well applied in the medical and food industries. How to make the core displacement process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G06T7/00G06T7/62
Inventor 狄勤丰华帅顾春元叶峰张景楠王文昌蒋帆
Owner SHANGHAI UNIV