CN108538535A - Eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet - Google Patents
Eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet Download PDFInfo
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- CN108538535A CN108538535A CN201810182614.4A CN201810182614A CN108538535A CN 108538535 A CN108538535 A CN 108538535A CN 201810182614 A CN201810182614 A CN 201810182614A CN 108538535 A CN108538535 A CN 108538535A
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- permanent magnet
- top surface
- eccentric type
- main permanent
- magnetic resonance
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
- H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
- H01F7/0284—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles using a trimmable or adjustable magnetic circuit, e.g. for a symmetric dipole or quadrupole magnetic field
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
It includes the main permanent magnet of non-metallic material that the embodiment of the present application, which provides a kind of eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet, the eccentric type nuclear magnetic resonance permanent magnet,；The main permanent magnet both ends are symmetrically arranged the secondary permanent magnet of a metal material；The main permanent magnet is coaxial with the secondary permanent magnet and is separated from each other distance to a declared goal；Axial direction and direction specific direction of the magnetic direction of the main permanent magnet perpendicular to the main permanent magnet；On the specific direction, the pair permanent magnet has the magnetic direction consistent with the main permanent magnet.The embodiment of the present application can reduce or not increase the size of nuclear magnetic resonance permanent magnet while obtaining the axial uniform magnetic field for meeting preset length requirement.
Description
Technical field
This application involves NMR logging tools technical fields, more particularly, to a kind of eccentric type NMR logging instrument
And its nuclear magnetic resonance permanent magnet.
Background technology
Nuclear magnetic resonance permanent magnet is the critical component on NMR logging instrument.When carrying out nuclear magnetic resonance log, nuclear-magnetism
Resonance permanent magnet can generate gradient magnetic in the earth formation, the polarization of horizontal direction be carried out to the hydrogen atom in stratum, over the ground with this
Hydrogen atom in layer generates the polarization of different magnetic field intensity on different radial depths, with reach to the stratum of different depth into
The purpose of row petrophysical information measurement.
During realizing the application, present inventor, which studies, to be found：Current existing nuclear magnetic resonance permanent magnet
Mostly non-metallic material will make nuclear magnetic resonance permanent magnetism physical efficiency since the magnetic field intensity of the permanent magnet of non-metallic material is relatively weak
Enough reach the axial uniform magnetic field for meeting preset length requirement, the size for increasing nuclear magnetic resonance permanent magnet is generally required, to lead
The volume of NMR logging instrument is caused to increase.
Invention content
The embodiment of the present application is designed to provide a kind of eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet,
To realize while obtaining the axial uniform magnetic field for meeting preset length requirement, nuclear magnetic resonance permanent magnet is reduced or not increased
Size.
In order to achieve the above objectives, on the one hand, the embodiment of the present application provides a kind of eccentric type nuclear magnetic resonance permanent magnet, including
The main permanent magnet of non-metallic material；The main permanent magnet both ends are symmetrically arranged the secondary permanent magnet of a metal material；It is described
Main permanent magnet is coaxial with the secondary permanent magnet and is separated from each other distance to a declared goal；The magnetic direction of the main permanent magnet is perpendicular to described
The axial direction and direction specific direction of main permanent magnet；On the specific direction, the pair permanent magnet has with the master forever
The consistent magnetic direction of magnet.
In the eccentric type nuclear magnetic resonance permanent magnet of the embodiment of the present application, the main permanent magnet has top surface and the on first
One bottom surface, top surface is the poles N on described first and first bottom surface is the poles S, and the middle part of top surface forms core on described first
The transmitting antenna installation site of magnetic resonance logging instrument, the radial dimension of first bottom surface are more than the diameter of top surface on described first
To size.
In the eccentric type nuclear magnetic resonance permanent magnet of the embodiment of the present application, the main permanent magnet includes integrally formed top
Divide and lower part, the upper part are the straight quadrangulars that section is isosceles trapezoid, the lower part is that section is rectangular straight
Quadrangular, the bottom surface of the upper part are overlapped with the upper top surface of the lower part.
In the eccentric type nuclear magnetic resonance permanent magnet of the embodiment of the present application, the pair permanent magnet includes pillar support body, with
And the cylindrical magnet structure for coating the pillar support outside and being fixed thereon, the cylindrical magnet structure have second
Upper top surface and the second bottom surface, the radial dimension of top surface is identical as the radial dimension of top surface on described first on described second, institute
The radial dimension for stating the second bottom surface is identical as the radial dimension of the first bottom surface.
In the eccentric type nuclear magnetic resonance permanent magnet of the embodiment of the present application, the cylindrical magnet structure is bonded by SmCo magnetic sheet
It forms.
In the eccentric type nuclear magnetic resonance permanent magnet of the embodiment of the present application, the axial length of the main permanent magnet is 0.8~
The axial length of 1m, the main permanent magnet are 20cm.
On the other hand, the embodiment of the present application provides a kind of eccentric type NMR logging instrument, is configured with eccentric type nuclear-magnetism
Resonate permanent magnet, and the eccentric type nuclear magnetic resonance permanent magnet includes the main permanent magnet of non-metallic material；The main permanent magnet both ends
It is symmetrically arranged the secondary permanent magnet of a metal material；The main permanent magnet is coaxial with the secondary permanent magnet and is separated from each other finger
Set a distance；Axial direction and direction specific direction of the magnetic direction of the main permanent magnet perpendicular to the main permanent magnet；Institute
It states on specific direction, the pair permanent magnet has the magnetic direction consistent with the main permanent magnet.
In the eccentric type NMR logging instrument of the embodiment of the present application, the main permanent magnet has top surface and the on first
One bottom surface, top surface is the poles N on described first and first bottom surface is the poles S, and the middle part of top surface forms core on described first
The transmitting antenna installation site of magnetic resonance logging instrument, the radial dimension of first bottom surface are more than the diameter of top surface on described first
To size.
In the eccentric type NMR logging instrument of the embodiment of the present application, the main permanent magnet includes integrally formed top
Divide and lower part, the upper part are the straight quadrangulars that section is isosceles trapezoid, the lower part is that section is rectangular straight
Quadrangular, the bottom surface of the upper part are overlapped with the upper top surface of the lower part.
In the eccentric type NMR logging instrument of the embodiment of the present application, the pair permanent magnet includes pillar support body, with
And the cylindrical magnet structure for coating the pillar support outside and being fixed thereon, the cylindrical magnet structure have second
Upper top surface and the second bottom surface, the radial dimension of top surface is identical as the radial dimension of top surface on described first on described second, institute
The radial dimension for stating the second bottom surface is identical as the radial dimension of the first bottom surface.
In the eccentric type NMR logging instrument of the embodiment of the present application, the cylindrical magnet structure is bonded by SmCo magnetic sheet
It forms.
In the eccentric type NMR logging instrument of the embodiment of the present application, the axial length of the main permanent magnet is 0.8~
The axial length of 1m, the main permanent magnet are 20cm.
By the above technical solution provided by the embodiments of the present application as it can be seen that in the embodiment of the present application, since secondary permanent magnet is
Metal material, its magnetic field intensity is greater than the main permanent magnet of non-metallic material under same size, and specific direction (i.e.
The magnetic direction of main permanent magnet) on, secondary permanent magnet has the magnetic direction consistent with main permanent magnet, to not increase eccentric type
In the case of nuclear magnetic resonance magnet size (even reducing eccentric type nuclear magnetic resonance magnet size), by adjusting secondary permanent magnetism
The distance between body and main permanent magnet, so that it may preferably to adjust the Distribution of Magnetic Field of main permanent magnet in the axial direction, to can get
Meet the axial uniform magnetic field of preset length requirement.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.In the accompanying drawings：
Fig. 1 is the dimensional structure diagram of eccentric type nuclear magnetic resonance permanent magnet in one embodiment of the application；
Fig. 2 is the radial schematic cross-sectional view of the main permanent magnet of eccentric type nuclear magnetic resonance permanent magnet in one embodiment of the application；
Fig. 3 is the radial schematic cross-sectional view of the secondary permanent magnet of eccentric type nuclear magnetic resonance permanent magnet in one embodiment of the application；
Fig. 4 is the dimensional structure diagram of eccentric type nuclear magnetic resonance permanent magnet in another embodiment of the application；
The magnetic field axial direction isodynamic line distribution map that Fig. 5 is generated when being the independent permanent magnet using the prior art；
The magnetic field axial direction isodynamic line point that Fig. 6 is generated when being the eccentric type nuclear magnetic resonance permanent magnet using the embodiment of the present application
Butut；
Fig. 7 is the use state diagram of the NMR logging instrument of one embodiment of the application.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The every other embodiment that technical staff is obtained without creative efforts should all belong to the application protection
Range.Such as in being described below, second component is formed above the first component, may include the first component and second component
The embodiment formed in a manner of being in direct contact can also include the first component and second component in a manner of non-direct contact (i.e. the
Can also include additional component between one component and second component) embodiment etc. that is formed.
Moreover, for ease of description, some embodiments of the application can use such as " in ... top ", " ... under ",
The spatially relative terms such as " top ", " lower section ", with description such as each element shown in the drawings of embodiment or component and another
Relationship between (or other) element or component.It should be understood that other than the orientation described in attached drawing, space is opposite
Term, which also aims to, includes the different direction of device in use or operation.If such as the device in attached drawing is reversed, and is described
For the element or component of " " other elements or component " below " or " under ", it will then be positioned as " " other elements or portion
Part " top " or " on ".
Present inventor, which studies, to be found：Although the magnetic field intensity of the permanent magnet of metal material is relatively stronger, due to
Nuclear magnetic resonance principle requires transmitting antenna to be located in the middle part of permanent magnet, and the radiofrequency signal of transmitting antenna also will be perpendicular to permanent magnet
Magnetic field；And transmitting antenna, when being located at the center of metal material permanent magnet, the radiofrequency signal that can be sent out to transmitting antenna causes sternly
The shielding interference of weight.Therefore, existing eccentric type nuclear magnetic resonance permanent magnet is mostly non-metallic material (such as metal oxide at present
Material etc.).However, no matter the eccentric type nuclear magnetic resonance permanent magnet axial dimension of existing monomer structure have how long, both ends are attached
Close axial magnetic field can always deform (as shown in Figure 5), to influence the uniformity of its axial magnetic field.Therefore, for partially
Cardioid nuclear magnetic resonance permanent magnet can reach the axial uniform magnetic field for meeting preset length requirement, generally require and increase eccentric type core
The axial dimension of magnetic resonance permanent magnet increases so as to cause the volume of eccentric type NMR logging instrument.
In order to solve this problem, the eccentric type nuclear-magnetism of the eccentric type NMR logging instrument in some embodiments of the application is total
The permanent magnet that shakes may include the main permanent magnet of non-metallic material；The main permanent magnet both ends are symmetrically arranged a metal material
Secondary permanent magnet；The main permanent magnet is coaxial with the secondary permanent magnet and is separated from each other distance to a declared goal；The magnetic of the main permanent magnet
Axial direction and direction specific direction of the field direction perpendicular to the main permanent magnet；On the specific direction, the pair permanent magnetism
Body has the magnetic direction consistent with the main permanent magnet.
Since secondary permanent magnet is metal material, its magnetic field intensity is greater than the master of non-metallic material forever under same size
Magnet, and on specific direction (magnetic direction of i.e. main permanent magnet), secondary permanent magnet has the magnetic field consistent with main permanent magnet
Direction, to not increase eccentric type nuclear magnetic resonance magnet size (even reducing eccentric type nuclear magnetic resonance magnet size)
In the case of, by adjusting secondary the distance between permanent magnet and main permanent magnet, so that it may preferably to adjust main permanent magnet in axial direction
On Distribution of Magnetic Field, to can get the axial uniform magnetic field for meeting preset length requirement, such as shown in Fig. 6.Comparison diagram 5 and figure
6 as can be seen that the field strength distribution of the axial magnetic field near eccentric type nuclear magnetic resonance permanent magnet both ends shown in Fig. 6 is more equal
It is even.
It should be noted that if it is also worthless that secondary permanent magnet, which is replaced with non-metallic material,.Due to non-metallic material
The secondary permanent magnet magnetic field intensity of matter is weaker, still reaches to less than corresponding technique effect.Moreover, in the case, due to segmentation
The length of magnetic field of the permanent magnet of non-metallic material afterwards can be than the permanent magnet of the non-metallic material of the monomer-type before segmentation than generally
Magnetic field intensity it is weaker, corresponding technique effect is not only not achieved, the axis of eccentric type nuclear magnetic resonance permanent magnet can be deteriorated instead
To Distribution of Magnetic Field.
Referring to fig. 1 and fig. 2, in one embodiment, the main permanent magnet 1 can have top surface and the first bottom on first
Face, top surface is the poles N on described first and first bottom surface is the poles S, and the middle part of top surface forms nuclear magnetic resonance on described first
The transmitting antenna installation site of logging instrument, the radial dimension of first bottom surface are more than the radial ruler of top surface on described first
It is very little, in order to enhance the magnetic flux of transmitting antenna installed position, to be conducive to improve the resolution ratio of NMR logging instrument.
Correspondingly, in conjunction with shown in Fig. 1 and Fig. 3, the pair permanent magnetism 21,22 may include pillar support body 31, and the cladding cylindricality
31 lateral surface of supporter and the cylindrical magnet structure 32 being fixed thereon, the cylindrical magnet structure 32 have second on top surface and
Second bottom surface, the radial dimension of top surface is identical as the radial dimension of top surface on described first on described second, under described second
The radial dimension of bottom surface is identical as the radial dimension of the first bottom surface, in order to preferably adjust the main permanent magnet 1
Axis magnetic field.
Shown in Fig. 1 and Fig. 2, in one embodiment, the main permanent magnet 1 includes integrally formed upper part
And lower part, the upper part are the straight quadrangulars that section is isosceles trapezoid, the lower part is that section is rectangular straight four
Prism, the bottom surface of the upper part are overlapped with the upper top surface of the lower part.When manufacturing the main permanent magnet 1, can first make
The structure of a four-prism shape is caused, then, Fig. 1 and main permanent magnet 1 shown in Fig. 2 are formed by techniques such as cuttings.In this way,
The radial dimension that the first bottom surface of the main permanent magnet 1 can not only be met is more than the radial dimension of its top surface on first, also easy
In the main part for retaining four-prism shape processed and can be more, to meet magnetic field intensity needs.
In one embodiment, preferably, cylindrical magnet structure 32 shown in Fig. 3 can be bonded by SmCo magnetic sheet.Due to
SmCo magnetic sheet not only magnetic field intensity compared with it is strong also to temperature change it is insensitive, therefore cylindrical magnet structure 32 uses SmCo magnetic sheet can be with
It is advantageously implemented high-resolution stabilizing magnetic field.But due to SmCo magnetic sheet mechanical performance (such as shock resistance, strain resistant ability)
Difference, it is therefore desirable to support protection using the pillar support body 31 of the material (such as the metals such as iron) of the good mechanical property of cooperation.
In addition, in one embodiment, preferably, in order to reach preferably support protecting effect, the pillar support body 31 can be circle
Cylindricality, correspondingly, 32 main body of cylindrical magnet structure can be cylindrical shape.It during fabrication, can present cylindrical support
Cylinder magnet structure 32 is formed on 31, then as needed, is formed in cylinder magnet structure 32 using techniques such as cuttings
Required upper top surface and bottom surface.In general, cylinder magnet structure 32 on cut height be outside diameter of cylinder 1/16~1/12,
The incision height of cylinder magnet structure 32 be cut on the 1/8~1/6 of outside diameter of cylinder height be diameter, specifically can be according to reality
Border it needs to be determined that.
Certainly, in some other embodiment, eccentric type nuclear magnetic resonance permanent magnet can also manufacture the structure of other shapes,
Such as shown in Fig. 4, to meet actual needs.
In some embodiments, preferably, considering the actual needs of NMR logging instrument, the axis of the main permanent magnet
Can be 0.8~1m to length, the axial length of the main permanent magnet can be 20cm or so, eccentric type nuclear magnetic resonance permanent magnet
Total length can be 2~3m.
In some embodiments, in eccentric type NMR logging instrument, the main permanent magnetism of eccentric type nuclear magnetic resonance permanent magnet
Body and secondary permanent magnet are the axial alignments along NMR logging instrument.And in actual use, since eccentric type nuclear-magnetism is total
The well logging well used that shakes is usually straight well, and eccentric type NMR logging instrument is longitudinal is put into straight well (as shown in Figure 7).This
Sample, the main permanent magnet of eccentric type nuclear magnetic resonance permanent magnet and secondary permanent magnet are actually longitudinal arrangement, and what is utilized is such as Fig. 6
Shown in magnetostatic field detected.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
Including so that component or equipment including a series of elements include not only those elements, but also include not clear
The other element listed, or further include for this component or the intrinsic element of equipment.In the feelings not limited more
Under condition, the element that is limited by sentence "including a ...", it is not excluded that in process, method or equipment including the element
In there is also other identical elements.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments, and related place is referring to side
The part of method embodiment illustrates.
Above is only an example of the present application, it is not intended to limit this application.For those skilled in the art
For, the application can have various modifications and variations.It is all within spirit herein and principle made by any modification, equivalent
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (12)
1. a kind of eccentric type nuclear magnetic resonance permanent magnet, which is characterized in that the main permanent magnet including non-metallic material；The main permanent magnetism
Body both ends are symmetrically arranged the secondary permanent magnet of a metal material；The main permanent magnet with the secondary permanent magnet coaxially and each other
Detach distance to a declared goal；Axial direction and direction certain party of the magnetic direction of the main permanent magnet perpendicular to the main permanent magnet
To；On the specific direction, the pair permanent magnet has the magnetic direction consistent with the main permanent magnet.
2. eccentric type nuclear magnetic resonance permanent magnet as described in claim 1, which is characterized in that the main permanent magnet has on first
Top surface and the first bottom surface, top surface is the poles N on described first and first bottom surface is the poles S, on described first in top surface
Portion forms the transmitting antenna installation site of NMR logging instrument, and the radial dimension of first bottom surface is more than on described first
The radial dimension of top surface.
3. eccentric type nuclear magnetic resonance permanent magnet as claimed in claim 2, which is characterized in that the main permanent magnet include one at
The upper and bottom section of type, the upper part are the straight quadrangulars that section is isosceles trapezoid, and the lower part is that section is length
Rectangular straight quadrangular, the bottom surface of the upper part are overlapped with the upper top surface of the lower part.
4. eccentric type nuclear magnetic resonance permanent magnet as claimed in claim 2, which is characterized in that the pair permanent magnet includes cylindricality branch
Support body, and the cladding pillar support outside and the cylindrical magnet structure that is fixed thereon, the cylindrical magnet structure
With top surface and the second bottom surface on second, on described second on the radial dimension and described first of top surface top surface radial dimension
Identical, the radial dimension of second bottom surface is identical as the radial dimension of the first bottom surface.
5. eccentric type nuclear magnetic resonance permanent magnet as claimed in claim 4, which is characterized in that the cylindrical magnet structure is by SmCo
Magnetic sheet bonds.
6. eccentric type nuclear magnetic resonance permanent magnet as described in claim 1, which is characterized in that the axial length of the main permanent magnet
Axial length for 0.8~1m, the main permanent magnet is 20cm.
7. a kind of eccentric type NMR logging instrument is configured with eccentric type nuclear magnetic resonance permanent magnet, which is characterized in that described inclined
Cardioid nuclear magnetic resonance permanent magnet includes the main permanent magnet of non-metallic material；The main permanent magnet both ends are symmetrically arranged a gold
Belong to the secondary permanent magnet of material；The main permanent magnet is coaxial with the secondary permanent magnet and is separated from each other distance to a declared goal；The main permanent magnetism
Axial direction and direction specific direction of the magnetic direction of body perpendicular to the main permanent magnet；It is described on the specific direction
Secondary permanent magnet has the magnetic direction consistent with the main permanent magnet.
8. eccentric type NMR logging instrument as claimed in claim 7, which is characterized in that the main permanent magnet has on first
Top surface and the first bottom surface, top surface is the poles N on described first and first bottom surface is the poles S, on described first in top surface
Portion forms the transmitting antenna installation site of NMR logging instrument, and the radial dimension of first bottom surface is more than on described first
The radial dimension of top surface.
9. eccentric type NMR logging instrument as claimed in claim 8, which is characterized in that the main permanent magnet include one at
The upper and bottom section of type, the upper part are the straight quadrangulars that section is isosceles trapezoid, and the lower part is that section is length
Rectangular straight quadrangular, the bottom surface of the upper part are overlapped with the upper top surface of the lower part.
10. eccentric type NMR logging instrument as claimed in claim 8, which is characterized in that the pair permanent magnet includes cylindricality
Supporter, and the cladding pillar support outside and the cylindrical magnet structure that is fixed thereon, the cylindrical magnet knot
Structure has top surface and the second bottom surface on second, on described second on the radial dimension and described first of top surface top surface radial ruler
Very little identical, the radial dimension of second bottom surface is identical as the radial dimension of the first bottom surface.
11. eccentric type NMR logging instrument as claimed in claim 10, which is characterized in that the cylindrical magnet structure is by samarium
Cobalt magnetic sheet bonds.
12. eccentric type NMR logging instrument as claimed in claim 7, which is characterized in that the axial direction of the main permanent magnet is long
Degree is 0.8~1m, and the axial length of the main permanent magnet is 20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182614.4A CN108538535B (en) | 2018-03-06 | 2018-03-06 | Eccentric nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182614.4A CN108538535B (en) | 2018-03-06 | 2018-03-06 | Eccentric nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108538535A true CN108538535A (en) | 2018-09-14 |
| CN108538535B CN108538535B (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020196018A1 (en) * | 2000-04-25 | 2002-12-26 | Baker Hughes Inc. | A nuclear magnetic resonance apparatus and method having toroidal antenna windings |
| JP2003303714A (en) * | 2002-04-09 | 2003-10-24 | Sumitomo Special Metals Co Ltd | Bar magnet and magnetic material removing device |
| CN103928211A (en) * | 2014-04-24 | 2014-07-16 | 北京昔光节科贸有限公司 | Permanent magnet for double-sector nuclear magnetic resonance logging instrument |
| CN106285505A (en) * | 2015-06-26 | 2017-01-04 | 中国石油集团长城钻探工程有限公司 | Box cupling magnetic orientation well logging pipe nipple and there is high speed the spread of the rumours logging instrument of this pipe nipple |
| WO2017061992A1 (en) * | 2015-10-06 | 2017-04-13 | Halliburton Energy Services, Inc. | Permanent magnet configuration for nmr logging tool |
-
2018
- 2018-03-06 CN CN201810182614.4A patent/CN108538535B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020196018A1 (en) * | 2000-04-25 | 2002-12-26 | Baker Hughes Inc. | A nuclear magnetic resonance apparatus and method having toroidal antenna windings |
| JP2003303714A (en) * | 2002-04-09 | 2003-10-24 | Sumitomo Special Metals Co Ltd | Bar magnet and magnetic material removing device |
| CN103928211A (en) * | 2014-04-24 | 2014-07-16 | 北京昔光节科贸有限公司 | Permanent magnet for double-sector nuclear magnetic resonance logging instrument |
| CN106285505A (en) * | 2015-06-26 | 2017-01-04 | 中国石油集团长城钻探工程有限公司 | Box cupling magnetic orientation well logging pipe nipple and there is high speed the spread of the rumours logging instrument of this pipe nipple |
| WO2017061992A1 (en) * | 2015-10-06 | 2017-04-13 | Halliburton Energy Services, Inc. | Permanent magnet configuration for nmr logging tool |
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| Publication number | Publication date |
|---|---|
| CN108538535B (en) | 2020-08-07 |
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