CN108565087B - Nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof - Google Patents
Nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof Download PDFInfo
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- CN108565087B CN108565087B CN201810178414.1A CN201810178414A CN108565087B CN 108565087 B CN108565087 B CN 108565087B CN 201810178414 A CN201810178414 A CN 201810178414A CN 108565087 B CN108565087 B CN 108565087B
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 claims abstract description 122
- 239000002184 metal Substances 0.000 claims abstract description 122
- 238000000926 separation method Methods 0.000 claims abstract description 9
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 8
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 7
- 230000006698 induction Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- H01F7/0294—Detection, inspection, magnetic treatment
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Geophysics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The embodiment of the application provides a nuclear magnetic resonance logging instrument and a nuclear magnetic resonance permanent magnet thereof, wherein the nuclear magnetic resonance permanent magnet comprises a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of the separation space. According to the embodiment of the application, the volume of the nuclear magnetic resonance logging instrument is not increased or reduced while the stratum identification resolution of the nuclear magnetic resonance logging instrument is improved.
Description
Technical Field
The application relates to nuclear magnetic resonance logging equipment, in particular to a nuclear magnetic resonance logging instrument and a nuclear magnetic resonance permanent magnet thereof.
Background
The nuclear magnetic resonance permanent magnet is a key part on the nuclear magnetic resonance logging instrument. When nuclear magnetic resonance logging is carried out, the nuclear magnetic resonance permanent magnet can generate a gradient magnetic field in the stratum to polarize hydrogen atoms in the stratum in the transverse direction, so that the hydrogen atoms in the stratum can be polarized in different magnetic field strengths on different radial depths, and the purpose of measuring petroleum physical information of the stratum in different depths is achieved.
In the process of implementing the present application, the inventors of the present application have studied and found that: although the magnetic field intensity of the permanent magnet made of metal is relatively stronger, the nuclear magnetic resonance principle requires that the transmitting antenna is positioned in the center of the permanent magnet, and the radio-frequency signal of the transmitting antenna is vertical to the magnetic field of the permanent magnet; when the transmitting antenna is located at the center of the metal permanent magnet, serious shielding interference can be caused to radio frequency signals transmitted by the transmitting antenna. Therefore, most of the conventional nmr permanent magnets are made of a non-metal material (e.g., a metal oxide material).
However, since the magnetic field strength of the non-metallic permanent magnet is relatively weak, the size of the nmr permanent magnet generally needs to be increased to achieve a predetermined formation recognition resolution, which results in an increase in the volume of the nmr logging tool.
Disclosure of Invention
An object of the embodiment of the present application is to provide a nuclear magnetic resonance logging instrument and a nuclear magnetic resonance permanent magnet thereof, so as to improve the formation recognition resolution of the nuclear magnetic resonance logging instrument, and simultaneously, not increase or decrease the volume of the nuclear magnetic resonance logging instrument.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a nuclear magnetic resonance permanent magnet, including a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of the separation space.
In the nuclear magnetic resonance permanent magnet of the embodiment of the present application, the first metallic permanent magnet and the second metallic permanent magnet are separated from each other by a prescribed distance.
In the nuclear magnetic resonance permanent magnet of the embodiment of the application, the first metal permanent magnet and the second metal permanent magnet both comprise a cylindrical support body and a cylindrical magnet structure, wherein the cylindrical support body is coated on the outer side surface of the cylindrical support body and is fixed on the cylindrical support body.
In the nuclear magnetic resonance permanent magnet of the embodiment of the application, the cylindrical magnet structure is formed by bonding samarium cobalt magnetic sheets.
In the nuclear magnetic resonance permanent magnet according to the embodiment of the present application, the columnar support body has a cylindrical structure, and the cylindrical magnet structure has a cylindrical structure.
In the nuclear magnetic resonance permanent magnet of the embodiment of the application, the diameter of the first metal permanent magnet and the diameter of the second metal permanent magnet are 60-130 mm, and the axial length of the first metal permanent magnet and the axial length of the second metal permanent magnet are 300-800 mm.
On the other hand, the embodiment of the application also provides a nuclear magnetic resonance logging instrument which is provided with a nuclear magnetic resonance permanent magnet and a transmitting antenna, wherein the nuclear magnetic resonance permanent magnet comprises a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of a separation space; the transmitting antenna is arranged at the antenna mounting position.
In the nuclear magnetic resonance logging tool of the embodiment of the application, the first metal permanent magnet and the second metal permanent magnet are separated from each other by a specified distance.
In the nuclear magnetic resonance logging instrument of the embodiment of the application, the first metal permanent magnet and the second metal permanent magnet respectively comprise a cylindrical support body and a cylindrical magnet structure, wherein the cylindrical support body is coated on the outer side surface of the cylindrical support body and is fixed on the cylindrical support body.
In the nuclear magnetic resonance logging instrument of the embodiment of the application, the cylindrical magnet structure is formed by bonding samarium cobalt magnetic sheets.
In the nuclear magnetic resonance logging instrument of the embodiment of the application, the cylindrical support body is of a cylindrical structure, and the cylindrical magnet structure is of a cylindrical structure.
In the nuclear magnetic resonance logging instrument of the embodiment of the application, the diameter of the first metal permanent magnet and the diameter of the second metal permanent magnet are 60-130 mm, and the axial length of the first metal permanent magnet and the axial length of the second metal permanent magnet are 300-800 mm.
According to the technical scheme provided by the embodiment of the application, the nuclear magnetic resonance permanent magnet comprises a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of the separation space; the transmitting antenna can be arranged at the antenna mounting position, so that the requirements that the transmitting antenna is positioned in the center of the permanent magnet and the radio-frequency signal of the transmitting antenna is perpendicular to the magnetic field of the permanent magnet are met according to the nuclear magnetic resonance principle. The first metal permanent magnet and the second metal permanent magnet are both permanent magnets made of metal materials, and the magnetic field intensity of the first metal permanent magnet and the second metal permanent magnet is much stronger than that of the permanent magnet made of non-metal materials in the prior art; therefore, compared with the prior art, the nuclear magnetic resonance permanent magnet in the embodiment of the application can realize higher stratum identification resolution with smaller size, thereby realizing that the volume of the nuclear magnetic resonance permanent magnet is reduced while the stratum identification resolution is improved, and further being beneficial to reducing the volume of a nuclear magnetic resonance logging instrument.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort. In the drawings:
FIG. 1 is a schematic perspective view of a NMR permanent magnet according to an embodiment of the present disclosure;
FIG. 2a is a schematic radial cross-sectional view of a first metal permanent magnet according to an embodiment of the present application;
FIG. 2b is a schematic radial cross-sectional view of a second metal permanent magnet according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the magnetic induction distribution of an axial cross section of a NMR permanent magnet according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the distribution of the magnetic induction intensity equipotential surfaces of a radial cross section of a NMR permanent magnet according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an embodiment of an NMR tool.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. For example, in the following description, forming the second component over the first component may include embodiments in which the first and second components are formed in direct contact, embodiments in which the first and second components are formed in non-direct contact (i.e., additional components may be included between the first and second components), and so on.
Also, for ease of description, some embodiments of the present application may use spatially relative terms such as "above …," "below …," "top," "below," etc., to describe the relationship of one element or component to another (or other) element or component as illustrated in the various figures of the embodiments. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or components described as "below" or "beneath" other elements or components would then be oriented "above" or "over" the other elements or components.
Nmr tools are typically configured with an nmr permanent magnet and a transmitting antenna. In some embodiments of the present application, the nuclear magnetic resonance permanent magnet may include a first metallic permanent magnet and a second metallic permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of a separation space; the transmitting antenna can be arranged at the antenna mounting position, so that the requirements that the transmitting antenna is positioned in the center of the permanent magnet and the radio-frequency signal of the transmitting antenna is perpendicular to the magnetic field of the permanent magnet according to the nuclear magnetic resonance principle are met.
The first metal permanent magnet and the second metal permanent magnet are both permanent magnets made of metal materials, and the magnetic field intensity of the first metal permanent magnet and the second metal permanent magnet is much stronger than that of the permanent magnets made of non-metal materials in the prior art; therefore, compared with the prior art, the nuclear magnetic resonance permanent magnet in some embodiments of the present application can realize higher formation identification resolution with a smaller size, thereby realizing that the volume of the nuclear magnetic resonance permanent magnet is reduced while the formation identification resolution is improved, and further being beneficial to reducing the volume of the nuclear magnetic resonance logging instrument.
In some embodiments, although theoretically, the closer the distance between the first metal permanent magnet and the second metal permanent magnet is, the larger the magnetic field intensity is, the more beneficial the formation identification resolution is; but this also places higher demands on the transmitting antenna (e.g., greater transmit power, transmit antenna size, etc.); meanwhile, the closer the distance between the first metal permanent magnet and the second metal permanent magnet is, the smaller the space for accommodating the transmitting antenna is, and the smaller the space for accommodating the transmitting antenna with a larger size is difficult to accommodate, which forms a contradiction. Therefore, in order not to increase or decrease each other, the distance between the first metal permanent magnet and the second metal permanent magnet cannot be too large or too small, but a compromise is required, that is, the first metal permanent magnet and the second metal permanent magnet may be separated from each other to a specified distance according to the actual situation. The specified distance can be obtained through experimental or theoretical calculation under the actual condition.
Referring to fig. 1, in some embodiments, the magnetic field direction of the first metallic permanent magnet 1 may be vertically upward; accordingly, the magnetic field direction of the second metal permanent magnet 2 may be vertically downward. Of course, in another exemplary embodiment, the first metal permanent magnet 1 and the second metal permanent magnet 2 may also be interchanged in magnetic field direction. In the embodiment shown in fig. 1, the transmitting antenna 3 of the nmr tool is located right at the center of the separation space between the first metallic permanent magnet 1 and the second metallic permanent magnet 2, i.e., at the antenna installation position of the nmr tool formed at the center of the separation space.
Experiments have shown that the efficiency of the permanent magnet of a cylindrical structure is the highest for a nmr tool, and therefore, in some embodiments of the present application, the first metallic permanent magnet 1 and the second metallic permanent magnet 2 may adopt a cylindrical structure. As shown in fig. 2a and 2b, for example, in some embodiments of the present application, each of the first metal permanent magnet 1 and the second metal permanent magnet 2 may include a cylindrical support 11, 21 and a cylindrical magnet structure 12, 22 covering an outer side surface of the cylindrical support 11, 21 and fixed thereto, and the cylindrical magnet structure 12, 22 may be formed by bonding a plurality of samarium-cobalt magnetic sheets having the same magnetic field direction. Thus, the cylindrical magnet structures 12, 22 can be made of samarium cobalt magnetic sheets to facilitate the realization of a high resolution stable magnetic field, since samarium cobalt magnetic sheets are not only strong in magnetic field strength but also insensitive to temperature variations. However, samarium cobalt magnetic sheets have poor mechanical properties (e.g., impact resistance and strain resistance), and therefore need to be supported and protected by cylindrical supports 11 and 21 made of a material having good mechanical properties (e.g., a metal such as iron).
In some embodiments, the diameter of the first metal permanent magnet 1 and the second metal permanent magnet 2 can be 60-130 mm, and the axial length of the first metal permanent magnet 1 and the second metal permanent magnet 2 can be 300-800 mm in consideration of the actual requirement of the nuclear magnetic resonance logging instrument; the total length of the nuclear magnetic resonance permanent magnet including the first metal permanent magnet 1 and the second metal permanent magnet 2 may be 900 to 2000 mm. The cylindrical surface range of the axial isomagnetic lines of the nuclear magnetic resonance permanent magnet can be 200-600 mm, and the magnetic induction intensity at the position with the detection radius of 400mm can be 60 Gs. In a specific embodiment, the corresponding parameters may be selected according to actual needs, wherein the axial isomagnetic line cylindrical surface range, the detection range, and the like of the nuclear magnetic resonance permanent magnet may be determined by comprehensively considering the permanent magnet material, the diameters of the first metal permanent magnet 1 and the second metal permanent magnet 2, the distance between the first metal permanent magnet 1 and the second metal permanent magnet 2, and other factors.
In some embodiments, the magnetic induction intensity distribution in the axial section of the first metal permanent magnet and the second metal permanent magnet of the nuclear magnetic resonance permanent magnet may be as shown in fig. 3, and the magnetic induction intensity equipotential surface distribution in the radial section of each metal permanent magnet may be as shown in fig. 4.
In some embodiments, the first metallic permanent magnet and the second metallic permanent magnet of the nmr permanent magnet are aligned along an axial direction of the nmr logging tool. In actual use, the nmr tool is placed longitudinally into a vertical well (as shown in fig. 5), since the well used for nmr logging is typically a vertical well. Thus, the first metallic permanent magnet and the second metallic permanent magnet of the nuclear magnetic resonance permanent magnet are substantially longitudinally aligned, and are detected by a static magnetic field as indicated by a dashed line frame in fig. 3. In the dashed box shown in fig. 3, the magnetic induction lines are emitted from the N pole of one metal permanent magnet and enter from the S pole of the other metal permanent magnet, so that the two metal permanent magnets cooperate to form the desired static magnetic field.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a component or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such component or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments, and the relevant points may be referred to the part of the description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A nuclear magnetic resonance permanent magnet is characterized by comprising a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are axially separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of a separation space; the magnetic field direction of the first metal permanent magnet is one of the radial directions of the first metal permanent magnet; the magnetic field direction of the second metal permanent magnet is one of the radial directions of the second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet respectively comprise a cylindrical support body and a cylindrical magnet structure which coats the outer side surface of the cylindrical support body and is fixed on the cylindrical support body.
2. The permanent magnet according to claim 1, wherein the first metallic permanent magnet and the second metallic permanent magnet are axially separated from each other by a prescribed distance.
3. The nmr permanent magnet of claim 1, wherein the cylindrical magnet structure is bonded by samarium cobalt magnetic sheets.
4. The nmr permanent magnet of claim 1 or 3, wherein the cylindrical support body is a cylindrical structure, and the cylindrical magnet structure is a cylindrical structure.
5. The NMR permanent magnet according to claim 4, wherein the first and second permanent magnets have a diameter of 60 to 130mm, and the first and second permanent magnets have an axial length of 300 to 800 mm.
6. A nuclear magnetic resonance logging instrument is provided with a nuclear magnetic resonance permanent magnet and a transmitting antenna, and is characterized in that the nuclear magnetic resonance permanent magnet comprises a first metal permanent magnet and a second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet are coaxial and are symmetrical left and right; the magnetic field directions of the first metal permanent magnet and the second metal permanent magnet are both directional directions and opposite; the first metal permanent magnet and the second metal permanent magnet are axially separated from each other, so that an antenna mounting position of the nuclear magnetic resonance logging instrument is formed in the center of a separation space; the transmitting antenna is arranged at the antenna mounting position; the magnetic field direction of the first metal permanent magnet is one of the radial directions of the first metal permanent magnet; the magnetic field direction of the second metal permanent magnet is one of the radial directions of the second metal permanent magnet; the first metal permanent magnet and the second metal permanent magnet respectively comprise a cylindrical support body and a cylindrical magnet structure which coats the outer side surface of the cylindrical support body and is fixed on the cylindrical support body.
7. The nuclear magnetic resonance logging tool of claim 6, wherein the first metallic permanent magnet and the second metallic permanent magnet are axially separated from each other by a specified distance.
8. The nmr tool of claim 6, wherein the cylindrical magnet structure is bonded by samarium cobalt magnetic sheets.
9. The nmr tool of claim 6 or 8, wherein the cylindrical support body is a cylindrical structure and the cylindrical magnet structure is a cylindrical structure.
10. The nmr tool of claim 9, wherein the first metallic permanent magnet and the second metallic permanent magnet have a diameter of 60 mm to 130mm, and wherein the first metallic permanent magnet and the second metallic permanent magnet have an axial length of 300 mm to 800 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810178414.1A CN108565087B (en) | 2018-03-05 | 2018-03-05 | Nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810178414.1A CN108565087B (en) | 2018-03-05 | 2018-03-05 | Nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof |
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| CN108565087B true CN108565087B (en) | 2021-01-01 |
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| CN113161101B (en) * | 2020-01-20 | 2023-11-28 | 中国石油天然气股份有限公司 | Permanent magnet for nuclear magnetic resonance logging instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105114071A (en) * | 2015-09-23 | 2015-12-02 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method |
| CN107035367A (en) * | 2017-04-28 | 2017-08-11 | 北京捷威思特科技有限公司 | NMR while drilling instrument magnet |
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| US7501817B1 (en) * | 1998-03-03 | 2009-03-10 | Schlumberger Technology Corporation | Method and apparatus for generating an axisymmetric magnetic field |
| CN102650208B (en) * | 2012-05-04 | 2015-05-06 | 中国石油大学(北京) | Nuclear magnetic resonance logger probe while drilling and nuclear magnetic resonance logger while drilling |
| CN105240000B (en) * | 2015-09-23 | 2018-04-17 | 中国石油大学(北京) | The NMR logging instrument and its probe of more investigation depths, antenna excitation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105114071A (en) * | 2015-09-23 | 2015-12-02 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method |
| CN107035367A (en) * | 2017-04-28 | 2017-08-11 | 北京捷威思特科技有限公司 | NMR while drilling instrument magnet |
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