CN103928211A - Permanent magnet for double-sector nuclear magnetic resonance logging instrument - Google Patents
Permanent magnet for double-sector nuclear magnetic resonance logging instrument Download PDFInfo
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- CN103928211A CN103928211A CN201410169102.6A CN201410169102A CN103928211A CN 103928211 A CN103928211 A CN 103928211A CN 201410169102 A CN201410169102 A CN 201410169102A CN 103928211 A CN103928211 A CN 103928211A
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- permanent magnet
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- logging instrument
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Abstract
The invention provides a permanent magnet for a double-sector nuclear magnetic resonance logging instrument. The permanent magnet is formed by bonding a plurality of small magnetic pieces in an adhesive mode, the cross section of the permanent magnet is elliptic, and the polarization direction of the small magnetic pieces is the same as the direction of the minor axis of the ellipse; in other words, the two ends of the minor axis of the elliptic cross section of the permanent magnet serve as the S pole and the N pole respectively. A hole with the diameter of 30 mm is reserved in the center of a magnet body, a magnet body mandrel is arranged in the hole, and the two ends of the magnet body mandrel respectively extend out of the magnet body by 100 mm to 200 mm. The permanent magnet is used for the probe portion of the novel double-sector nuclear magnetic resonance logging instrument, a gradient magnetic field with a 140-degree part in the S pole direction and a 140-degree part in the N pole direction can be generated in the stratum around a borehole, the cylindrical surface range of the axial isodynamic lines can reach 1200 mm, the weight of the whole logging instrument is greatly reduced, the polarization direction of the small magnetic pieces is the same as the direction of the minor axis of the ellipse, the cylindrical surface of the axial isodynamic lines is optimized, and no suddenly-changing interruption points exist on the cylindrical surface. The pre-polarization magnet body is arranged on the side, in the advancing direction of logging, of the main magnet body mandrel and used for increasing the logging speed.
Description
Technical field
The present invention relates to mineral exploration engineering and petroleum well logging technology field, relate in particular to a kind of biparting permanent magnet for NMR logging instrument.
Background technology
Nulcear magnetic resonance (NMR) permanent magnet is the critical component on NMR logging instrument, the measuring principle of carrying out oil physical message of NMR logging instrument magnet is, NMR logging instrument magnet can produce gradient magnetic in stratum, hydrogen atom in stratum is carried out to the polarization of horizontal direction, with this to the hydrogen atom in 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 to oil physical message.
The magnet of U.S. Halliburton Co., axial detection district 600mm, surveys stratigraphic resolution 600mm, therefore tests the speed very slow, and dtr signal; The magnet of France Schlumberger company, is uniform field magnet, tests the speed extremely slow, and investigation depth is extremely shallow, the requirement of inadaptable modern well logging; Chinese patent magnet 1088791, inside is cavity, so the polarization intensity of magnet is very low, effective scope of detection is minimum, can only test few oil well, is difficult to reach the demand of common well logging, stops using in the market; Chinese patent magnet 101294493A, this magnet is identical with the magnet of U.S. Halliburton Co., and axial detection district 600mm surveys stratigraphic resolution 600mm, tests the speed very slow, and dtr signal;
The magnet that NMR logging instrument adopts at present mainly contains following several:
The cylindrical magnets of U.S. Halliburton Co., this magnet is a cylinder magnet steel, 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.The early stage tri-type uniform magnetic field magnets of CMR of France Schlumberger company, this magnet consists 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;
The third is China Patent Publication No. 1088791, a kind of permanent magnet for NMR logging instrument is provided, by four or polylith permanent magnetic steel, with seccotine is bonding, form cylinder, inner circle in cylinder is hollow, inner circle is contrary with outer circular polarity, and inside is the S utmost point, and circle outside is the N utmost point, but this invention is simple in structure, there is no limit blind area;
At China Patent Publication No. 101294493A, a kind of permanent magnet for NMR logging instrument is also provided, by the small magnetic rod body after the identical radial magnetizing in 10-50 cross section, by seccotine bonding, formed, after small magnetic rod body bonding, total length is between 1800-2500 millimeter.
Summary of the invention
For above-mentioned defect of the prior art and problem, the object of the embodiment of the present invention is to provide a kind of biparting permanent magnet for NMR logging instrument, adopt high-performance magnetism material to make, the S utmost point and the N utmost point are respectively at magnet minor axis two ends, this permanent magnet can produce the gradient magnetic of each 140 degree of S utmost point N extreme direction in wellbore stratum, axially isodynamic line face of cylinder scope can reach 1200 millimeters, stratum detecting resolution 200mm-800mm, testing the speed improve 3 times in the situation that, signal quality has also obtained obvious improvement, not only enhance productivity, and can expand its range of application.
In order to achieve the above object, the embodiment of the present invention provides following technical scheme:
A kind of biparting permanent magnet for NMR logging instrument, it is characterized in that, by bonding the forming of little magnetic sheet stack, it does not have continuous bonding plane in the radial direction, its cross section is oval, the polarised direction of little magnetic sheet is oval short-axis direction, and the minor axis two ends of its oval cross section are respectively the S utmost point and the N utmost point; Magnet center leaves the hole of 30 millimeters of diameters, and magnet mandrel is installed in hole, and magnet mandrel two ends respectively exceed magnet 100-200 millimeter.
As technique scheme preferably, the major axis length of the oval cross section of described permanent magnet is between 100-116 millimeter, minor axis length is between 90-110 millimeter.
As technique scheme preferably, the magnet mandrel of described permanent magnet is being connected with pre-polarized magnets along well logging direct of travel one side, pre-polarized magnets adopts samarium-cobalt material to make, pre-polarized magnets is open circles column type, external diameter is between 110-120 millimeter, internal diameter is between 90-100 millimeter, and cylinder height is between 150-300 millimeter; Pre-polarized magnets has 0-200 millimeter apart from permanent magnet, and the magnetic field of pre-polarized magnets generation is 3 times of magnetic field of permanent magnet.
As technique scheme preferably, the material of the little ceramics of described formation permanent magnet is ferrite magnetic sheet.
A kind of biparting the permanent magnet for NMR logging instrument that the embodiment of the present invention provides, it is a kind of permanent magnet of brand-new biparting NMR logging instrument probe part, can in wellbore stratum, produce the gradient magnetic of each 140 degree of S utmost point N extreme direction, axially isodynamic line face of cylinder scope can reach 1200 millimeters, greatly alleviated the weight of whole logger, the polarised direction of little magnetic sheet is oval short-axis direction, has optimized the axial isodynamic line face of cylinder, and discontinuous point does not suddenly change on the face of cylinder.Main magnet mandrel along well logging direct of travel one side connects pre-polarized magnets, for improving logging speed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the cross-sectional structure schematic diagram of a kind of biparting permanent magnet for NMR logging instrument of the embodiment of the present invention.
Fig. 2 is the main TV structure schematic diagram of a kind of biparting permanent magnet for NMR logging instrument of the embodiment of the present invention.
Fig. 3 is that the magnet of a kind of biparting permanent magnet for NMR logging instrument of the embodiment of the present invention is measured the gradient magnetic equipotential surface schematic diagram of each 140 degree of radially S utmost point N extreme direction around.
Fig. 4 is the test data schematic diagram of axial isodynamic line face of cylinder scope of a kind of biparting permanent magnet for NMR logging instrument of the embodiment of the present invention.
In figure, magnet mandrel-1, permanent magnet for NMR logging instrument-2, pre-polarized magnets-3.
Embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1-2, permanent magnet for NMR logging instrument 2 is by some blocks of high performance ferrite magnetic sheets (polarised direction is ellipse short shaft direction) bonding the forming that superpose, 1670 millimeters of the main magnet total lengths after bonding, and cross section is oval, long 100 millimeters of transverse, long 95 millimeters of minor axis.Magnet center has the through hole of 30 millimeters of diameters, be used for installing magnet mandrel 1, mandrel 1 two ends respectively grow 200 millimeters of permanent magnets, be used for connecting logging instrument miscellaneous part, this permanent magnet 1 can produce the gradient magnetic of each 140 degree of S utmost point N extreme direction in wellbore stratum, and axially isodynamic line face of cylinder scope can reach 1200 millimeters.
Permanent magnet mandrel along well logging direct of travel one side connects pre-polarized magnets 3, and pre-polarized magnets 3 adopts samarium-cobalt material to make, and pre-polarized magnets 3 is open circles column type, 100 millimeters of external diameters, 90 millimeters of internal diameters, body length is 200 millimeters, pre-polarized magnets 3 is apart from 50 millimeters of permanent magnets.
As shown in Figure 1-2, permanent magnet for NMR logging instrument is that the little magnetic patch after magnetizing by some forms by seccotine bonding, main magnet total length after bonding is at 1670 millimeters, little magnetic patch adopts Ferrite Material to make, the magnetizing direction of ferrite magnetic patch is magnet cross section ellipse short shaft direction as shown in Figure 1, the main magnet center of permanent magnet for NMR logging instrument having bondd has through hole, central through hole diameter is 30 millimeters, the cross section of main magnet is oval, long 100 millimeters of transverse, long 95 millimeters of minor axis, the minor axis two ends of main magnet are respectively the S utmost point and the N utmost point, in wellbore stratum, produce the gradient magnetic of each 140 degree of S utmost point N extreme direction, axially isodynamic line face of cylinder scope can reach 1200 millimeters, the sintering of the little magnetic patch of ferrite does not belong to scope of the present invention with magnetizing, do not describe in detail.
As shown in Figure 2, have a stainless steel mandrel in the centre bore of the main magnet of permanent magnet for NMR logging instrument, the two ends of mandrel respectively grow 200 millimeters of main magnet end faces, for connecting logging instrument miscellaneous part.
Main magnet mandrel along well logging direct of travel one side connects pre-polarized magnets, and pre-polarized magnets adopts samarium-cobalt material to make, and pre-polarized magnets is open circles column type, 100 millimeters of external diameters, and 90 millimeters of internal diameters, body length is 200 millimeters.50 millimeters of the main magnets of pre-polarized magnets distance.
In test process, the N utmost point of the main magnet of permanent magnet for NMR logging instrument produces gradient magnetic to wellbore stratum, and the magnetic line of force returns to the S utmost point, produces the gradient magnetic of each 140 degree of S utmost point N extreme direction in wellbore stratum.Fig. 3 is that magnet is measured the gradient magnetic equipotential surface schematic diagram of each 140 degree of radially S utmost point N extreme direction around, from scheming, can clearly see, produces biparting gradient magnetic of each 140 degree of S utmost point N extreme direction in wellbore stratum.
Fig. 4 is the test data schematic diagram of axial isodynamic line face of cylinder scope of a kind of biparting permanent magnet for NMR logging instrument of the embodiment of the present invention, and on figure, transverse axis represents magnetic field range, unit: mm; The longitudinal axis represents magnetic field magnetic induction, unit: Gs; Every group of lines are test data one time, and data show, for magnet is surveyed axial isodynamic line face of cylinder scope 0-1200mm, magnetic field error ± 2Gs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (4)
1. biparting permanent magnet for NMR logging instrument, it is characterized in that, by bonding the forming of little magnetic sheet stack, it does not have continuous bonding plane in the radial direction, its cross section is oval, the polarised direction of little magnetic sheet is oval short-axis direction, and the minor axis two ends of its oval cross section are respectively the S utmost point and the N utmost point; Magnet center leaves the hole of 30 millimeters of diameters, and magnet mandrel is installed in hole, and magnet mandrel two ends respectively exceed magnet 100-200 millimeter.
2. a kind of biparting permanent magnet for NMR logging instrument according to claim 1, is characterized in that, the major axis length of the oval cross section of described permanent magnet is between 100-116 millimeter, and minor axis length is between 90-110 millimeter.
3. a kind of biparting permanent magnet for NMR logging instrument according to claim 1, it is characterized in that, the magnet mandrel of described permanent magnet is being connected with pre-polarized magnets along well logging direct of travel one side, pre-polarized magnets adopts samarium-cobalt material to make, pre-polarized magnets is open circles column type, external diameter is between 110-120 millimeter, and internal diameter is between 90-100 millimeter, and cylinder height is between 150-300 millimeter; Pre-polarized magnets has 0-200 millimeter apart from permanent magnet, and the magnetic field of pre-polarized magnets generation is 3 times of magnetic field of permanent magnet.
4. a kind of biparting permanent magnet for NMR logging instrument according to claim 1, is characterized in that, the material of the little magnetic sheet of described formation permanent magnet is ferrite magnetic sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169102.6A CN103928211A (en) | 2014-04-24 | 2014-04-24 | Permanent magnet for double-sector nuclear magnetic resonance logging instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169102.6A CN103928211A (en) | 2014-04-24 | 2014-04-24 | Permanent magnet for double-sector nuclear magnetic resonance logging instrument |
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| CN103928211A true CN103928211A (en) | 2014-07-16 |
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| CN201410169102.6A Pending CN103928211A (en) | 2014-04-24 | 2014-04-24 | Permanent magnet for double-sector nuclear magnetic resonance logging instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201498A (en) * | 2015-09-23 | 2015-12-30 | 中国石油大学(北京) | Nuclear magnetic resonance downhole fluid analyzer |
| CN108538535A (en) * | 2018-03-06 | 2018-09-14 | 中国石油天然气股份有限公司 | Eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet |
| CN108533257A (en) * | 2018-06-08 | 2018-09-14 | 北京捷威思特科技有限公司 | NMR logging instrument magnet |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050030021A1 (en) * | 2003-05-02 | 2005-02-10 | Prammer Manfred G. | Systems and methods for NMR logging |
| CN1760508A (en) * | 2005-07-07 | 2006-04-19 | 中国石化集团胜利石油管理局测井公司 | Well logger of nuclear magnetic resonance |
| CN101097799A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Permanent magnet for NMR logging instrument probe |
| CN101294493A (en) * | 2007-04-29 | 2008-10-29 | 中国石油天然气集团公司 | Center type permanent magnet of nuclear magnetic resonance logging instrument probe |
| 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 |
| CN102360703A (en) * | 2011-10-12 | 2012-02-22 | 上海神开石油化工装备股份有限公司 | Magnet structure of petroleum underground nuclear magnetic resonance logging while drilling apparatus |
-
2014
- 2014-04-24 CN CN201410169102.6A patent/CN103928211A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050030021A1 (en) * | 2003-05-02 | 2005-02-10 | Prammer Manfred G. | Systems and methods for NMR logging |
| CN1760508A (en) * | 2005-07-07 | 2006-04-19 | 中国石化集团胜利石油管理局测井公司 | Well logger of nuclear magnetic resonance |
| CN101097799A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Permanent magnet for NMR logging instrument probe |
| CN101294493A (en) * | 2007-04-29 | 2008-10-29 | 中国石油天然气集团公司 | Center type permanent magnet of nuclear magnetic resonance logging instrument probe |
| 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 |
| CN102360703A (en) * | 2011-10-12 | 2012-02-22 | 上海神开石油化工装备股份有限公司 | Magnet structure of petroleum underground nuclear magnetic resonance logging while drilling apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201498A (en) * | 2015-09-23 | 2015-12-30 | 中国石油大学(北京) | Nuclear magnetic resonance downhole fluid analyzer |
| CN105201498B (en) * | 2015-09-23 | 2018-03-09 | 中国石油大学(北京) | Nuclear magnetic resonance downhole fluid analysis instrument |
| CN108538535A (en) * | 2018-03-06 | 2018-09-14 | 中国石油天然气股份有限公司 | Eccentric type NMR logging instrument and its nuclear magnetic resonance permanent magnet |
| CN108538535B (en) * | 2018-03-06 | 2020-08-07 | 中国石油天然气股份有限公司 | Eccentric nuclear magnetic resonance logging instrument and nuclear magnetic resonance permanent magnet thereof |
| 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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Effective date of registration: 20141226 Address after: 100107 Beijing city Chaoyang District Qing Road No. 7 Building No. 8 hospital 13 floor 2 unit 1601 Applicant after: Beijing Orangelamp Navigation Technology Development Co., Ltd. Address before: 100000, unit 2, building 8, 7 Ching Ching Road, Beijing, Chaoyang District 1601, China Applicant before: BEIJING XIGUANGJIE TECHNOLOGY TRADE CO., LTD. |
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Application publication date: 20140716 |