CN101294493A - Center type permanent magnet of nuclear magnetic resonance logging instrument probe - Google Patents
Center type permanent magnet of nuclear magnetic resonance logging instrument probe Download PDFInfo
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- CN101294493A CN101294493A CNA2007100988872A CN200710098887A CN101294493A CN 101294493 A CN101294493 A CN 101294493A CN A2007100988872 A CNA2007100988872 A CN A2007100988872A CN 200710098887 A CN200710098887 A CN 200710098887A CN 101294493 A CN101294493 A CN 101294493A
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- magnetic rod
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Abstract
The invention relates to a medium-duty permanent magnet for the nuclear magnetic resonance logging instrument probe, in particular to a permanent magnet for generating the gradient magnetic field underground, which is arranged on a nuclear magnetic resonance logging instrument. The permanent magnet is characterized in that the permanent magnet is formed by 10 to 50 numbers of small magnetic pillar bodies which are provided with identical cross sections and stuck together with strong adhesive after being radially charged with magnetism; the total length of the small magnetic pillar bodies after being stuck is between 1800 to 2500 mm. The small magnetic pillar bodies are made of ferrite material. Through-holes are arranged at the centers of the small magnetic pillar bodies. The cross section of each small magnetic pillar body is the middle part of the two symmetrical chords of a circle. The outer surfaces of the small magnetic pillar bodies form symmetrical planes. The two symmetrical planes of the small magnetic pillar bodies are S pole and N pole respectively. The outer diameter of the circle is between 50 to 70 mm; the length of the longest vertical line of the chords to the edge of the circle is between 5 to 30 mm. A titanium steel wire is arranged in the center hole of the medium-duty permanent magnet for the nuclear magnetic resonance logging instrument probe, and both ends of the titanium steel wire are 5 to 15 mm higher than the cross sections of the small magnetic pillar bodies. The permanent magnet has the advantages that a 360 DEG gradient magnetic field can be generated in peripheral formation of the well bore, and a detection blind area is arranged in the peripheral formation of the well bore.
Description
Technical field
The present invention relates to the petroleum well logging technology field, relate generally to a kind of critical component of NMR (Nuclear Magnetic Resonance) logging instrument, is a kind of magnet of type NMR logging instrument probe part placed in the middle, is arranged on the NMR (Nuclear Magnetic Resonance) logging instrument, can produce gradient magnetic in the down-hole.
Technical background
The NMR logging instrument probe magnet produces gradient magnetic in the stratum, the hydrogen atom in the stratum is carried out the polarization of longitudinal direction.With this to the hydrogen atom in the stratum on different radial depths, produce the polarization of different magnetic field intensity.To reach the measurement of the stratum of different depth being carried out the oil physical message.
The magnet of NMR (Nuclear Magnetic Resonance) logging instrument employing at present mainly contains following several: the cylindrical magnets of U.S. Halliburton Company, this magnet are cylinder magnet steel, and the disc both sides are respectively the N utmost point or the S utmost point.Gradient magnetic field distribution is that the magnetic line of force by the N utmost point and S interpolar closure forms.This magnet has simple in structure, easy processing, easy advantage such as magnetize, and is fit to make of ferrite magnetic materials, and this material magnetic energy rank is lower, can integral body magnetize.Three type uniform magnetic fields of CMR magnet that Schlumberger Ltd. is early stage, this magnet is made of three blocks of cuboid magnet steel, axial magnetic field, the front and back of each cuboid magnet steel are the N utmost point or the S utmost point, Distribution of Magnetic Field is that the magnetic line of force by magnet steel produces a uniform magnetic field in detecting area, this system can only detect at a little model circle of direction at every turn, and uniform field debugging and all very harsh to environment requirement.Its modified afterwards is samarium-cobalt gradient magnetic magnet, adopts and pastes borehole wall mode, and magnet shape is similar to trapezoidal.The magnetic energy product of magnet is not too high, and magnet volume is big, the probe complex process, and cost of manufacture increases.The bicylindrical type magnet of Britain Oxford company, this magnet is made of two ring cylinder magnet steel, axial magnetic field, each cylindrical two is the N utmost point or the S utmost point.DISTRIBUTION OF MAGNETIC FIELD is to produce uniform magnetic field by the cylindrical closed magnetic line of force at detecting area, and this system also can only detect in a direction at every turn among a small circle.Chinese patent notification number 1088791 provides a kind of permanent magnet for NMR logging instrument, constitutes cylinder by four or polylith permanent magnetic steel with the seccotine bonding, and the interior circle in the cylinder is hollow, and interior circle is opposite with outer circular polarity, and inside is the S utmost point, is the N utmost point outside justifying.This invention is simple in structure, does not have the limit blind area.But a magnetic pole is interior, and a magnetic pole outside.Fa Ming magnet weak point can not change magnet length according to the needs at scene in addition, makes it difficult with the instrument coupling, inapplicable NMR (Nuclear Magnetic Resonance) logging instrument.
Summary of the invention
The purpose of this invention is to provide a kind of type permanent magnet for NMR logging instrument probe placed in the middle, adopt nonconducting Ferrite Material to make magnet, magnet is the cylinder of stack combinations, two magnetic poles are on two symmetrical planes, can in wellbore 360 degree stratum, produce the gradient magnetic of designing requirement, measure different depth oil in place physical message, in the wellbore stratum, do not have detection blind area.
The technical solution used in the present invention is: type permanent magnet for NMR logging instrument probe placed in the middle is to be formed by the small magnetic rod body and function seccotine bonding behind the identical radial magnetizing in 10-50 cross section, bonding afterwards total length between the 1800-2500 millimeter.The small magnetic rod body adopts Ferrite Material to make.There is through hole at small magnetic rod body center.The cross section of small magnetic rod body is the mid portion of two symmetrical strings of circle, and promptly a circle has two symmetrical strings, two shape of cross sections that symmetrical string mid portion is the small magnetic rod body.The external surface of small magnetic rod body forms the plane of symmetry.Two symmetrical planes of small magnetic rod body are respectively the S utmost point or the N utmost point, produce the gradient magnetic of 360 degree in the wellbore stratum, do not have detection blind area in the wellbore stratum.The external diameter of described circle is between the 50-70 millimeter; Described string arrives the longest vertical line length in round edge between the 5-30 millimeter.In the centre bore of type permanent magnet for NMR logging instrument probe placed in the middle a titanium steel silk is arranged, the two ends of titanium steel silk grow magnetic cylinder small in ends (1) end face 5-15 millimeter.
The length of described small magnetic rod body is between the 50-200 millimeter.The diameter of small magnetic rod body central through hole is between the 2-5 millimeter.
Beneficial effect invention effect of the present invention: type permanent magnet for NMR logging instrument probe placed in the middle, adopt center on Page, adopting nonconducting Ferrite Material is magnet, two magnetic poles are on monosymmetric plane, therefore can reduce the influence of eddy current, can in wellbore 360 degree stratum, produce the gradient magnetic of designing requirement, in the wellbore stratum, not have detection blind area.Reduce the design difficulty of resonant circuit simultaneously, simplified sonde configuration, increased the whole weight capacity of probe.When strengthening pre-polarized magnets length, can strong raising test the speed.Center on Page is at the wellbore non-blind area, and the gradient magnetic that is produced can be realized the multidimensional well logging.
Description of drawings
Fig. 1 is the vertical view of the present invention's type permanent magnet for NMR logging instrument probe placed in the middle.
Fig. 2 is the front view of the present invention's type permanent magnet for NMR logging instrument probe placed in the middle, is partly to cut open schematic diagram.
Among the figure, 1. small magnetic rod body, 2. titanium steel silk.
The specific embodiment
Embodiment 1: consult accompanying drawing 2.Type permanent magnet for NMR logging instrument probe placed in the middle is to be formed by the small magnetic rod body and function seccotine bonding behind the identical radial magnetizing in 10 cross sections, and bonding back total length is at 2000 millimeters.Consult accompanying drawing 1.The small magnetic rod body adopts Ferrite Material to make.There is through hole at small magnetic rod body center, and the diameter of central through hole is 3 millimeters.The cross section of small magnetic rod body is the mid portion of two symmetrical strings of circle, and promptly a circle has two symmetrical strings, two shape of cross sections that symmetrical string mid portion is the small magnetic rod body.The external surface of small magnetic rod body forms the plane of symmetry.Two symmetrical planes of small magnetic rod body are respectively the S utmost point and the N utmost point, produce the gradient magnetic of 360 degree in the wellbore stratum, do not have detection blind area in the wellbore stratum.The sintering of small magnetic rod body does not belong to scope of the present invention with magnetizing, and is not described in detail.50 millimeters of the external diameters of the external circle of small magnetic rod; String arrives 15 millimeters of the longest vertical line length in round edge.Consult accompanying drawing 2.In the centre bore of type permanent magnet for NMR logging instrument probe placed in the middle a titanium steel silk is arranged, the two ends of titanium steel silk grow 10 millimeters of magnetic cylinder small in ends (1) end faces.
In the test process, the N utmost point of type permanent magnet for NMR logging instrument probe placed in the middle produces gradient magnetic to the wellbore stratum, and the magnetic line of force returns the S level, can produce the gradient magnetic of 360 degree in the wellbore stratum.
Embodiment 2: consult accompanying drawing 3.Substantially the same manner as Example 1, difference is: an end face of described small magnetic rod body is the taper seat of depression; Another end face is the taper seat of projection.The number of degrees of taper seat drift angle are between the 110-170 degree.The taper seat drift angle of present embodiment is 120 degree.
Claims (3)
1, a kind of type permanent magnet for NMR logging instrument probe placed in the middle, it is characterized in that: be to form with the seccotine bonding by the small magnetic rod body (1) behind the identical radial magnetizing in 10-50 cross section, small magnetic rod body (1) bonding back total length is between the 1800-2500 millimeter, small magnetic rod body (1) adopts Ferrite Material to make, there is through hole at small magnetic rod body (1) center, the cross section of small magnetic rod body (1) is the mid portion of two symmetrical strings of circle, i.e. circle, two symmetrical strings are arranged, two shape of cross sections that symmetrical string mid portion is the small magnetic rod body, the external surface of small magnetic rod body (1) forms the plane of symmetry, two symmetrical planes of small magnetic rod body (1) are respectively the S utmost point or the N utmost point, produce the gradient magnetic of 360 degree in the wellbore stratum, do not have detection blind area in the wellbore stratum, the external diameter of described circle is between the 50-70 millimeter; Described string arrives the longest vertical line length in round edge between the 5-30 millimeter, in the centre bore of type permanent magnet for NMR logging instrument probe placed in the middle a titanium steel silk (2) is arranged, and the two ends of titanium steel silk (2) grow magnetic cylinder small in ends (1) end face 5-15 millimeter.
2, type permanent magnet for NMR logging instrument probe placed in the middle according to claim 1 is characterized in that: the length of described single small magnetic rod body (1) is between the 50-200 millimeter, and the diameter of small magnetic rod body (1) central through hole is between the 2-5 millimeter.
3, type permanent magnet for NMR logging instrument probe placed in the middle according to claim 1 and 2 is characterized in that: an end face of described small magnetic rod body is the taper seat of depression; Another end face is the taper seat of projection, and the number of degrees of taper seat drift angle are between the 110-170 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100988872A CN101294493B (en) | 2007-04-29 | 2007-04-29 | Center type permanent magnet of nuclear magnetic resonance logging instrument probe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100988872A CN101294493B (en) | 2007-04-29 | 2007-04-29 | Center type permanent magnet of nuclear magnetic resonance logging instrument probe |
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| CN101294493A true CN101294493A (en) | 2008-10-29 |
| CN101294493B CN101294493B (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100988872A Active CN101294493B (en) | 2007-04-29 | 2007-04-29 | Center type permanent magnet of nuclear magnetic resonance logging instrument probe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331588A (en) * | 2011-08-03 | 2012-01-25 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument as well as probe magnet and probe thereof |
| CN102444400A (en) * | 2011-11-15 | 2012-05-09 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| 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 |
| CN103953337A (en) * | 2014-05-19 | 2014-07-30 | 沈阳工业大学 | Nuclear magnetic resonance logging instrument probe |
| CN105134200A (en) * | 2015-09-23 | 2015-12-09 | 中国石油大学(北京) | Azimuthal nuclear magnetic resonance logging instrument and probe thereof |
| CN106761727A (en) * | 2017-02-06 | 2017-05-31 | 中国石油天然气集团公司 | A kind of type NMR logging instrument test pit device placed in the middle |
| CN111472766A (en) * | 2020-05-06 | 2020-07-31 | 中国石油天然气集团有限公司 | Magnet of downhole nuclear magnetic resonance logging instrument |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088791C (en) * | 1998-05-08 | 2002-08-07 | 中国科学院武汉物理与数学研究所 | Permanent magnet for NMR logging instrument |
| GB2367130A (en) * | 2000-05-12 | 2002-03-27 | Halliburton Energy Serv Inc | Method of evaluating formation resistivity at a selected depth of investigation |
-
2007
- 2007-04-29 CN CN2007100988872A patent/CN101294493B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331588A (en) * | 2011-08-03 | 2012-01-25 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument as well as probe magnet and probe thereof |
| CN102331588B (en) * | 2011-08-03 | 2014-08-06 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument as well as probe magnet and probe thereof |
| CN102444400A (en) * | 2011-11-15 | 2012-05-09 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| CN102444400B (en) * | 2011-11-15 | 2015-03-11 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| 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 |
| CN103953337A (en) * | 2014-05-19 | 2014-07-30 | 沈阳工业大学 | Nuclear magnetic resonance logging instrument probe |
| CN103953337B (en) * | 2014-05-19 | 2017-08-11 | 沈阳工业大学 | A kind of NMR logging instrument probe |
| CN105134200A (en) * | 2015-09-23 | 2015-12-09 | 中国石油大学(北京) | Azimuthal nuclear magnetic resonance logging instrument and probe thereof |
| CN105134200B (en) * | 2015-09-23 | 2017-12-12 | 中国石油大学(北京) | The probe and orientation NMR logging instrument of orientation NMR logging instrument |
| CN106761727A (en) * | 2017-02-06 | 2017-05-31 | 中国石油天然气集团公司 | A kind of type NMR logging instrument test pit device placed in the middle |
| CN111472766A (en) * | 2020-05-06 | 2020-07-31 | 中国石油天然气集团有限公司 | Magnet of downhole nuclear magnetic resonance logging instrument |
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| Publication number | Publication date |
|---|---|
| CN101294493B (en) | 2011-12-07 |
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