CN208310760U - NMR logging instrument magnet - Google Patents
NMR logging instrument magnet Download PDFInfo
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- CN208310760U CN208310760U CN201820887188.XU CN201820887188U CN208310760U CN 208310760 U CN208310760 U CN 208310760U CN 201820887188 U CN201820887188 U CN 201820887188U CN 208310760 U CN208310760 U CN 208310760U
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- logging instrument
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Abstract
The utility model 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 two 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 two 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, guarantees that magnet is fixed reliable, relative position is stablized, and Distribution of Magnetic Field is stablized；There is pre-polarizing magnet to can be improved logging speed；Magnet structure is compact, and magnet volume does not need just to be able to satisfy very much the magnetic field strength that well logging needs greatly.
Description
Technical field
The utility model relates to NMR logging instrument magnet be cable nuclear magnetic resonance log applied to petroleum geology exploration
Instrument and equipment belongs to petroleum well logging technology field for measuring the property and content of fluid in stratum.
Background technique
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 mode 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.
Summary of the invention
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 does not need just to be able to satisfy very much the magnetic field strength that well logging needs greatly；Pre-polarizing magnet and master
Magnet is all welded on one block of steel plate, guarantees 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 production domesticization.
The technology employed by the present utility model is
NMR logging instrument magnet is mainly made of main magnet, pre-polarizing magnet and transmitting antenna；Wherein, main magnet
It is made of main magnet one and main magnet two, is distributed in steel plate two sides, pre-polarizing magnet is made of upper and lower two parts, and top is by pre- pole
Change magnet one, the composition of pre-polarizing magnet two, lower part is made of pre-polarizing magnet three, pre-polarizing magnet four, and upper and lower part is pre-
Polarized magnets are respectively distributed to steel plate two 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.
The utility model has the beneficial effects that
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, easily fabricated and dismounting maintenance；
4, domestic similar product blank is filled up.
Detailed description of the invention
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 embodiment
As shown in Figure 1 and Figure 2, the utility model NMR logging instrument magnet is mainly by main magnet, pre-polarizing magnet and hair
Penetrate the composition of antenna 8；Wherein, main magnet is made of main magnet 1 and main magnet 22, is distributed in 7 two sides of steel plate, pre-polarizing magnet
Be made of upper and lower two parts, top is made of pre-polarizing magnet 1, pre-polarizing magnet 24, lower part by pre-polarizing magnet 35,
Pre-polarizing magnet 46 forms, and upper and lower part pre-polarizing magnet is respectively distributed to 7 two 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 two 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
Range is 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 the preferred embodiment of the utility model and its technical principle used, for the technology of this field
It is any to be based on technical solutions of the utility model base without departing substantially from the spirit and scope of the utility model for personnel
Equivalent transformation, simple replacement on plinth etc. obviously change, and belong within scope of protection of the utility model.
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 two 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 two 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 |
|---|---|---|---|
| CN201820887188.XU CN208310760U (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820887188.XU CN208310760U (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208310760U true CN208310760U (en) | 2019-01-01 |
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ID=64710631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820887188.XU Active CN208310760U (en) | 2018-06-08 | 2018-06-08 | NMR logging instrument magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208310760U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533257A (en) * | 2018-06-08 | 2018-09-14 | 北京捷威思特科技有限公司 | NMR logging instrument magnet |
-
2018
- 2018-06-08 CN CN201820887188.XU patent/CN208310760U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533257A (en) * | 2018-06-08 | 2018-09-14 | 北京捷威思特科技有限公司 | NMR logging instrument magnet |
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