Permanent magnet for NMR logging instrument probe

A nuclear magnetic resonance and permanent magnet technology, applied in the direction of permanent magnets, etc., can solve the problems of high production cost and large size of magnets, and achieve the effect of improving speed measurement, small size of magnets, and strong magnetic field

Inactive Publication Date: 2008-01-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The volume of the magnet is too large, and the production cost is relatively high

Method used

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  • Permanent magnet for NMR logging instrument probe

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Experimental program
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Effect test

Embodiment Construction

[0011] As shown in Figure 2, the magnetic column 86 is bonded by 80 or more radially magnetized permanent magnet small magnetic steel superglue with numbers 6, 7, ... 84, 85 to form a permanent magnet magnet. Column 86.

[0012] As shown in Figure 1, the permanent magnet of the NMR logging tool probe adopts a radial magnetic field, and the top view dimensions of the magnetic columns are 1, 3, and 5, respectively. The magnetization direction is radial, and the magnetic poles are S pole 2 and N pole 4 respectively. The small magnetic steels are 6, 7, ... 84, 85. The top view size is shown in 1, 3, 5 of Fig. 1, the thickness is 2.5cm, and the magnetic material is a samarium-cobalt permanent magnet with a magnetic energy product N30. 80 pieces of permanent magnetic small magnetic steel with a thickness of 2.5cm or more are bonded by super glue to form a permanent magnet magnetic column 86,

[0013] 2 and 4 in Fig. 1 are the S-level and N-poles with opposite levels respectively. ...

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Abstract

A nuclear magnetic resonance well logging machine probe permanent magnet for generating gradient magnetic field in ground layer, engaged with nuclear magnetic resonance well logging machine to check the physical information of ground layer, is characterized in that a magnet post (86)is composed of adhered at least one small magnetic block (6), wherein the magnet is one portion of one cylinder. The invention sticks the magnet on well wall, while the magnet is N30 high-energy-accumulation samarium-cobalt magnet, with small volume, strong magnetic field, and high detection length. The invention simplifies the probe structure, improves the bearing strength of whole probe, improves the length of pre-polarized magnet, and improves detection speed, which can avoid blind area at the well wall direction, to improve detection accuracy, and generate gradient magnetic field along the well wall, to realize multi-dimension well logging.

Description

Technical field: [0001] The invention belongs to petroleum logging instruments and equipment, and mainly relates to a permanent magnet in the probe part of a nuclear magnetic resonance logging instrument, which is used to generate a gradient magnetic field in a formation and is matched with the nuclear magnetic resonance logging instrument to detect formation physical information. Background technique: [0002] The permanent magnet of the NMR logging tool probe generates a gradient magnetic field in the formation, which polarizes the hydrogen atoms in the formation in the longitudinal direction. In order to generate polarization of different magnetic field strengths for hydrogen atoms in the formation at different radial depths. In order to achieve the measurement of petroleum physical information on formations of different depths. [0003] At present, the magnets used in nuclear magnetic resonance logging tools mainly include the following types: the cylindrical magnet of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02
Inventor 张本庭王瑞清肖立志孙伯勤
Owner BC P INC CHINA NAT PETROLEUM CORP
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