CN108533257A - NMR logging instrument magnet - Google Patents
NMR logging instrument magnet Download PDFInfo
- Publication number
- CN108533257A CN108533257A CN201810588879.4A CN201810588879A CN108533257A CN 108533257 A CN108533257 A CN 108533257A CN 201810588879 A CN201810588879 A CN 201810588879A CN 108533257 A CN108533257 A CN 108533257A
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- CN
- China
- Prior art keywords
- magnet
- polarizing
- main
- steel plate
- logging instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/32—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electron or nuclear magnetic resonance
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- High Energy & Nuclear Physics (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention relates to a kind of NMR logging instrument magnets, mainly it is made of main magnet, pre-polarizing magnet and transmitting antenna, wherein, main magnet is made of main magnet one and main magnet two, steel plate both sides are distributed in, pre-polarizing magnet is made of upper and lower two parts, and top is made of pre-polarizing magnet one, pre-polarizing magnet two, lower part is made of pre-polarizing magnet three, pre-polarizing magnet four, is respectively distributed to steel plate both sides.Magnet is made of the fritter magnet of length 5cm, and magnet is fixed by non-magnetic rustproof steel cage, and non-magnetic rustproof steel cage is weldingly fixed on steel plate, ensures that magnet fixes reliable, relative position stabilization, Distribution of Magnetic Field stabilization；There is pre-polarizing magnet that can improve logging speed；Magnet structure is compact, and magnet volume need not the too big magnetic field intensity that can meet well logging and need.
Description
Technical field
NMR logging instrument magnet of the present invention is the cable nuclear magnetic resonance log instrument applied to petroleum geology exploration
Equipment belongs to petroleum well logging technology field for the property and content of fluid in measurement stratum.
Background technology
Cable nuclear magnetic resonance log is the property and content of fluid in stratum to be measured using nuclear magnetic resonance principle, while can measure
Porosity, constraint fluid volume, free fluid volume, permeability and the fluid behaviour on stratum, the pore-size information of rock can
To be calculated using nuclear magnetic resonance log data.
Instrument currently on the market is mainly using measurement pattern placed in the middle or patch borehole wall measurement pattern.Measurement pattern placed in the middle is than inclined
The physical size of heart pattern magnet is big, and instrument outer diameter is big, and measuring signal is by conditions shadows such as wellbore size, instrument centering effects
Ring measurement result.
Invention content
To solve the above problems, designing a kind of NMR logging instrument magnet of misalignment measurement, measured using eccentric modes,
Magnet structure of popping one's head in is compact, and magnet volume need not the too big magnetic field intensity that can meet well logging and need；Pre-polarizing magnet and master
Magnet is all welded on one block of steel plate, ensures that magnet relative position is stablized, Distribution of Magnetic Field is also more stable, there is pre-polarizing magnet energy
Enough improve logging speed；Volume production, and the alternative similar imported product of foreign countries are easy under existing working condition at home, realizes instrument
Device domesticizes.
The technical solution adopted in the present invention is：
NMR logging instrument magnet is mainly made of main magnet, pre-polarizing magnet and transmitting antenna；Wherein, main magnet is by leading
Magnet one and main magnet two form, and are distributed in steel plate both sides, pre-polarizing magnet is made of upper and lower two parts, and top is by pre-polarizing magnetic
Body one, pre-polarizing magnet two form, and lower part is made of pre-polarizing magnet three, pre-polarizing magnet four, upper and lower part pre-polarizing
Magnet is respectively distributed to steel plate both sides.
Main magnet, pre-polarizing magnet are made of the trapezoidal fritter magnet of long 5cm, and magnet is fixed by non-magnetic rustproof steel cage,
Non-magnetic rustproof steel cage is weldingly fixed on steel plate.
Transmitting antenna is housed outside main magnet.
Beneficial effects of the present invention：
1, it is weldingly fixed on one block of steel plate, magnet is stablized, stable magnetic field；
2, there is pre-polarizing magnet, improve logging speed；
3, magnet body assembly size is small, and easily fabricated and dismounting is safeguarded；
4, domestic similar product blank is filled up.
Description of the drawings
Fig. 1 is magnet body assembly schematic diagram；
Fig. 2 is main magnet schematic cross-section；
Fig. 3 is Distribution of Magnetic Field schematic diagram.
Specific implementation mode
As shown in Figure 1 and Figure 2, NMR logging instrument magnet of the present invention is mainly by main magnet, pre-polarizing magnet and transmitting day
Line 8 forms；Wherein, main magnet is made of main magnet 1 and main magnet 22, is distributed in 7 both sides of steel plate, pre-polarizing magnet is by upper
Lower two parts are constituted, and top is made of pre-polarizing magnet 1, pre-polarizing magnet 24, and lower part is by pre-polarizing magnet 35, pre- pole
Change magnet 46 to form, upper and lower part pre-polarizing magnet is respectively distributed to 7 both sides of steel plate.
Main magnet, pre-polarizing magnet are made of the trapezoidal magnet of long 5cm, and magnet is fixed by non-magnetic rustproof steel cage 9, no magnetic
Stainless steel cage 9 is weldingly fixed on steel plate 7.
The polarity of the magnetic field of the main magnet of 7 both sides of steel plate is consistent, generates a gradient magnetic B radially changed jointly0, in advance
The magnetic direction of polarized magnets is identical with main magnet.
As shown in figure 3, main magnet forms one 120 degree of fan-shaped measured zone near wellbore stratum, fathom
It is ranging from 2.7 inches to 4.3 inches, 24 inches high, 0.06 inch of the fan-shaped thickness of the shell of measured zone.
Transmitting antenna 8 is housed, 8 tranmitting frequency of antenna determines fan-shaped from 450kHz ~ 900kHz, tranmitting frequency outside main magnet
The investigation depth in region can greatly improve the signal-to-noise ratio of data with cumulative method since the working frequency of instrument is more.
The above is presently preferred embodiments of the present invention and its technical principle used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simple replacement etc. is obvious changes, all fall within the protection scope of the present invention.
The above is presently preferred embodiments of the present invention and its technical principle used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simple replacement etc. is obvious changes, all fall within the protection scope of the present invention.
Claims (3)
1. a kind of NMR logging instrument magnet, it is characterised in that：Mainly by main magnet, pre-polarizing magnet and transmission antenna group
At；
Wherein, main magnet is made of main magnet one and main magnet two, is distributed in steel plate both sides, pre-polarizing magnet is by upper and lower two parts
It constitutes, top is made of pre-polarizing magnet one, pre-polarizing magnet two, and lower part is by four groups of pre-polarizing magnet three, pre-polarizing magnet
At upper and lower part pre-polarizing magnet is respectively distributed to steel plate both sides.
2. NMR logging instrument magnet according to claim 1, it is characterised in that：The main magnet, pre-polarizing magnet
It is made of the trapezoidal magnet of long 5cm, magnet is fixed by non-magnetic rustproof steel cage, and non-magnetic rustproof steel cage is weldingly fixed on steel plate.
3. NMR logging instrument magnet according to claim 1, it is characterised in that：Equipped with transmitting outside the main magnet
Antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810588879.4A CN108533257A (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810588879.4A CN108533257A (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108533257A true CN108533257A (en) | 2018-09-14 |
Family
ID=63470541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810588879.4A Withdrawn CN108533257A (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108533257A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020125885A1 (en) * | 2000-07-27 | 2002-09-12 | Baker Hughes Incorporated | Side-looking NMR probe for oil well logging |
| CN101328805A (en) * | 2007-06-19 | 2008-12-24 | 普拉德研究及开发股份有限公司 | Method and apparatus for measuring free induction decaying signals and their application in analysis |
| CN101343998A (en) * | 2008-09-03 | 2009-01-14 | 中国石油天然气股份有限公司 | High-temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof |
| CN201546719U (en) * | 2009-11-11 | 2010-08-11 | 中国海洋石油总公司 | Focusing nuclear magnetic resonance eccentric well-logging probe |
| CN102650208A (en) * | 2012-05-04 | 2012-08-29 | 中国石油大学(北京) | Nuclear magnetic resonance logger probe while drilling and nuclear magnetic resonance logger while drilling |
| 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 |
| CN204804835U (en) * | 2015-04-28 | 2015-11-25 | 西南石油大学 | Nuclear magnetic resonance surveys logging system |
| CN107525819A (en) * | 2017-07-17 | 2017-12-29 | 中国石油大学(北京) | Nuclear magnetic resonance analysis of fluid instrument probe and nuclear magnetic resonance analysis of fluid instrument |
| CN208310760U (en) * | 2018-06-08 | 2019-01-01 | 北京捷威思特科技有限公司 | NMR logging instrument magnet |
-
2018
- 2018-06-08 CN CN201810588879.4A patent/CN108533257A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020125885A1 (en) * | 2000-07-27 | 2002-09-12 | Baker Hughes Incorporated | Side-looking NMR probe for oil well logging |
| CN101328805A (en) * | 2007-06-19 | 2008-12-24 | 普拉德研究及开发股份有限公司 | Method and apparatus for measuring free induction decaying signals and their application in analysis |
| CN101343998A (en) * | 2008-09-03 | 2009-01-14 | 中国石油天然气股份有限公司 | High-temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof |
| CN201546719U (en) * | 2009-11-11 | 2010-08-11 | 中国海洋石油总公司 | Focusing nuclear magnetic resonance eccentric well-logging probe |
| CN102650208A (en) * | 2012-05-04 | 2012-08-29 | 中国石油大学(北京) | Nuclear magnetic resonance logger probe while drilling and nuclear magnetic resonance logger while drilling |
| 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 |
| CN204804835U (en) * | 2015-04-28 | 2015-11-25 | 西南石油大学 | Nuclear magnetic resonance surveys logging system |
| CN107525819A (en) * | 2017-07-17 | 2017-12-29 | 中国石油大学(北京) | Nuclear magnetic resonance analysis of fluid instrument probe and nuclear magnetic resonance analysis of fluid instrument |
| CN208310760U (en) * | 2018-06-08 | 2019-01-01 | 北京捷威思特科技有限公司 | NMR logging instrument magnet |
Non-Patent Citations (1)
| Title |
|---|
| 胡法龙, 肖立志: "核磁共振测井仪典型探头设计分析", 石油机械, vol. 34, no. 8, pages 76 - 79 * |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180914 |