Active field nuclear magnetic resonance logging probe with adjustable detection area and detection method thereof

A magnetic resonance logging and detection area technology, applied in the field of geophysical exploration, can solve the problems of low signal-to-noise ratio and small effective detection area, and achieve high signal-to-noise ratio, strong signal, and improved signal-to-noise ratio

Inactive Publication Date: 2019-07-26
JILIN UNIV
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  • Active field nuclear magnetic resonance logging probe with adjustable detection area and detection method thereof
  • Active field nuclear magnetic resonance logging probe with adjustable detection area and detection method thereof
  • Active field nuclear magnetic resonance logging probe with adjustable detection area and detection method thereof

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[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0036] See figure 1 , Active field nuclear magnetic resonance logging probe device with adjustable detection area, including: probe housing 1, rack 2, permanent magnet 3, permanent magnet housing 4, worm gear 5, worm 6, reduction motor 7, support frame 8 and a transceiver unit Coil 9.

[0037] The probe housing 1 has a cylindrical shape, which meets the requirements of logging dimensions. The specific shape of the probe shell standardizes the layout of its internal components and also provides protection for the internal components of the instrument.

[0038] The two permanent magnets 3 are placed with opposite polarities...

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Abstract

The invention belongs to the research field of geophysical exploration technology, and relates to an active field nuclear magnetic resonance logging probe with an adjustable detection area and a detection method thereof. The probe comprises a cylindrical probe shell, wherein layout of components in the probe is specified by a cylindrical structure with a specific diameter, the size requirement ofa well logging borehole is met, and the components in the probe are protected; two axially magnetized permanent magnets, which are oppositely arranged in polarity, an annular magnetic field which is strengthened firstly and then weakened is generated outside the probe, and the external hydrogen protons can be magnetized to form a detection area; a moving unit consisting of a speed reducing motor,a worm gear and a rack, which can change the distance between the two permanent magnets, thereby changing the position of the detection area outside the probe. The layout mode of the permanent magnetsin the invention can generate a detection area with larger space outside the probe, and the signal-to-noise ratio of nuclear magnetic signals can be enhanced. The invention also utilizes the characteristic of self-locking of worm transmission, and changes the distance between the permanent magnets by controlling the speed reducing motor, thereby changing the position of the detection uniform areaand obtaining the detection capability of more radial detection depths.

Description

Technical field [0001] The invention belongs to the research field of geophysical prospecting technology, and relates to an active field nuclear magnetic resonance logging probe with an adjustable detection area and a detection method thereof. Background technique [0002] Nuclear magnetic resonance detection technology is a method that can detect groundwater directly and non-destructively in the field of geophysics. However, the detection depth of ground nuclear magnetic resonance detection technology is limited, and the limit detection depth is 150 meters. The use of nuclear magnetic resonance logging technology can break through the depth limit of ground nuclear magnetic resonance. For nuclear magnetic resonance logging technology, increasing its radial detection range and enhancing signal-to-noise ratio are new challenges. The magnetization direction of the permanent magnets of traditional logging tools is radial magnetization, and the magnetic field strength decays as the ...

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Application Information

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IPC IPC(8): G01V5/04G01V5/08
CPCG01V5/04G01V5/08
Inventor 林君朱金宝王华梁滕飞林婷婷
Owner JILIN UNIV
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