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Rapid detection method for magnetic interference of core on low-field nuclear magnetic resonance image

A low-field nuclear magnetic resonance and nuclear magnetic resonance technology, which is applied in the direction of using nuclear magnetic resonance for analysis, can solve time-consuming and labor-intensive problems

Inactive Publication Date: 2015-12-16
SHANGHAI UNIV
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Problems solved by technology

The original method is to saturate the core to be tested with water, and then perform nuclear magnetic imaging to determine whether there is magnetic interference in the core to be tested. The whole process takes about 3 to 4 days, which is time-consuming and laborious, and has a certain impact on the physical properties of the core (such as The core has magnetic interference, if it is not used for experiments immediately, it needs to be dried for preservation, otherwise hydration may occur), which will affect other experiments using the tested core

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Embodiment Construction

[0021] Now the specific embodiment of the present invention in conjunction with accompanying drawing is described in the following.

[0022] A method for rapidly detecting magnetic interference of rock cores on low-field nuclear magnetic resonance images in this embodiment, the test steps are:

[0023] (1) Put the 3# test coil in the NMR magnet, and turn on the NMR radio frequency switch.

[0024] (2) Put the standard sample of copper sulfate aqueous solution in the 3# coil, and calibrate the center frequency to 23MHz and the offset frequency to 100kHz.

[0025] (3) After adjustment, the parameters of the instrument are: TE is 9.5ms, TR is 1000ms, the number of echoes is 10000, the offset of RF signal frequency is 28965Hz, the number of sampling points is 1000, and the width of 180-degree RF pulse is 58μm, the sampling start point control parameter is 0.005ms.

[0026] (4) Open the nuclear magnetic resonance imaging software to obtain the image of the copper sulfate standard...

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Abstract

The present invention relates to a rapid detection method for the magnetic interference of core on a low-field nuclear magnetic resonance image, and belongs to the technical field of low-magnetic field nuclear magnetic resonance detection and petroleum engineering recovery rate improving. With the development of the low-field nuclear magnetic resonance core flooding system online detection technology and the nuclear magnetic resonance image post-processing software, the nuclear magnetic resonance technology are increasingly being used for detecting the flowing condition of the fluid inside the core porous media, the detection of the nuclear magnetic resonance technology on the fluid flowing process inside the core is convenient and intuitive and meets the actual flow field condition of the fluid, and the development of the technology provides important theoretical and practical significance for the petroleum engineering research on the recovery rate improving mechanism. According to the present invention, the core and the standard water sample are subjected to bundled test, and the intensity of the magnetic interference of the core is determined through the deformation condition of the standard water sample image; and the testing method is fast and intuitive, has strong reliability, and is the effective method for detecting the core magnetic interference.

Description

technical field [0001] The invention relates to a rapid detection method for magnetic interference of rock cores on low-field nuclear magnetic resonance images, and belongs to the technical fields of low-field nuclear magnetic resonance detection and petroleum engineering recovery factor enhancement. Background technique [0002] Magnetic Resonance Imaging (MRI) technology is to use the principle of nuclear magnetic resonance to obtain the internal structure image of the object by detecting the electromagnetic waves emitted by the external gradient magnetic field. This technology is currently widely used in medical treatment, food and archaeology. With the development of low-field nuclear magnetic resonance core displacement system online detection technology and magnetic resonance image post-processing software, nuclear magnetic resonance technology is more and more used to detect the fluid flow inside the core porous medium. It is very intuitive and convenient to detect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 狄勤丰华帅顾春元蒋帆叶峰张景楠王文昌
Owner SHANGHAI UNIV
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