CN101343998B - High temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof - Google Patents
High temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high temperature magnet of a nuclear magnetic resonance well logger, which can be applied to the technical field of the oil well logging. The high temperature magnet of the nuclear magnetic resonance well logger is characterized in that the high temperature magnet comprises a magnet and a magnet frame, wherein, the magnet is composed of two separating magnetic bodies, the two separating magnetic bodies are parallelly and symmetrically fixed at both sides of the magnet frame, and the N-pole directions of the two separating magnetic bodies are identical. Each separating magnetic body is formed through parallelly sticking seven magnetic blocks, and the polarized angle range of the seven magnetic blocks is between minus 15 degrees to 30 degrees. The magnet frame is made of titanium alloy material. The high temperature magnet of the nuclear magnetic resonance well logger can provide a relative uniform magnetic field area for a nuclear magnetic resonance well logger system, the volume size of the uniform magnetic field area can meet the requirements of the nuclear magnetic resonance logging, and the volume of the uniform magnetic field area is larger. In addition, the high temperature magnet is safe and stable under the conditions of 175 DEG C and 140 MPa.
Description
Technical field
The present invention relates to the petroleum well logging technology field, particularly a kind of NMR logging instrument specifically is a kind of important component part of NMR logging instrument probe a---high temperature magnet.
Background technology
At present, using on the NMR logging instrument probe of used in oil well logging has magnet, classifies from the magnetic field structure of magnet, generally is divided into two types of gradient magnetic and uniform magnetic fields.The representative products of gradient magnetic and uniform magnetic field is respectively that U.S. NUMAR and this two company of Schlumberger produce.Abroad technical data such as magnet structure and manufacture craft are holded in close confidence.
Magnet is the most key parts of NMR logging instrument, and it provides a field region comparatively uniformly for a whole set of MR system.The primary signal of nuclear magnetic resonance produces in this field region exactly, so the size of the magnetic field deviation of magnet homogeneity range and the volume of homogeneity range is decision nuclear magnetic signal quality quality directly, also is the signal to noise ratio that directly has influence on a whole set of MR system.And the selection of magnetic material and magnet packaging technology be directly determine magnet can be in high temperature, hyperbaric environment the necessary condition of safety, steady operation.
Chinese patent, notice of authorization number are the patent of invention of CN1088791C, disclose a kind of permanent magnet for NMR logging instrument.Be made up of permanent magnetic steel, it is characterized in that four permanent magnetic steels constitute cylinder with seccotine bonding, interior circle is hollow, and interior circle is opposite with outer circular polarity, be respectively N ← → the S utmost point.Interior circular field intensity is zero, and cylindrical has the magnetic line of force that is evenly distributed, and is comprehensive to external radiation at 360 degree.The loop pillar body is fixed on the probe of nuclear magnetic resonance side well appearance, need only once logs well and just can accomplish the omnibearing detection of the whole borehole wall 360 degree.But in order to reduce the volume and weight of magnet, but reduced the scope of uniform magnetic field, and directly caused whole instrument magnetic field intensity, magnetic field homogeneity and stability all to reduce greatly.Do not consider how to ensure permanent magnet for NMR logging instrument in high temperature, hyperbaric environment, safety, steady operation.
Chinese patent, notice of authorization CN100399479C provides a kind of permanent magnet that the portable nuclear magnetic resonance device uses that is suitable for, and comprises the polylith yoke, and they form rectangular shape yoke body; A pair of permanent magnet block is installed on two relative upper and lower yokes, on the said a pair of permanent magnet block surfaces opposite to each other pole plate is installed respectively, and the grading ring identical with its outer rim shape is housed on another surface of said pole plate; It is characterized in that: said permanent magnet block is processed by samarium-cobalt permanent-magnetic material; The outer rim of said pole plate and grading ring is rectangular shape; And the mid portion of the side yoke except that the upper and lower yoke that said permanent magnet block is installed is excised, and forms the through hole of symmetrical geometric figure shape.Effect is: owing to use the pole plate of rectangular shape, thereby in the spatial dimension of identical limit, can obtain the pole plate area that increased than circular pole plate, thereby, increased the volume in shimming district, in the pole plate interstice coverage, form uniform magnetic field to greatest extent.On the other hand, the uniform magnetic field of same intensity be produced,, more this magnet of small size can be used according to the magnet of structure of the present invention.Side yoke core forms the hollow otch that is symmetric geometry, and this has alleviated the weight of whole magnet very effectively, so in light weight for processing, volume is little, the nuclear magnetic resonance device that is suitable for portable mobile use is given security condition.Its direct significance is, uses the nuclear magnetic resonance device that structure permanent magnet of the present invention is installed, and can be implemented in digging and the on-the-spot on-the-spot test of mine locating, realizes real-time direction and test to rock sample.
At present, design of NMR logging instrument down-hole high temperature magnet and making aspect exist following problem to be difficult to solve:
1, the general structure design of high temperature magnet;
2, high temperature magnet thermal stability problems;
3, the manufacture craft of high temperature magnet.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof, can be applied to NMR logging instrument; Change the high temperature magnet structure, acquisition can provide a field regions comparatively uniformly for NMR logging instrument, and the volume size of this comparatively uniform field regions is under the situation that can satisfy the nuclear magnetic resonance log needs, and the volume of homogeneity range is big as far as possible.And solve the magnet thermal stability problems, make the magnet can be in safe and stable operation under the high-temperature and high-pressure conditions.
The high temperature magnet general structure design
The general arrangement of high temperature magnet mainly comprises Computer Numerical Simulation and two parts of actual physics modeling; Wherein Computer Numerical Simulation can be determined the size of high temperature magnet basic size, DISTRIBUTION OF MAGNETIC FIELD form and field intensity, for the foundation of actual physics model provides theory and numerical basis; The actual physics model is set up the accuracy of can proof theory calculating.
1. Magnetic Field Numerical simulation
Electromagnetic field can be described by organizing Maxwell equation differential expression with next:
B＝μH……………………1-3
B is expressed as with magnetic flux density
Can obtain the second order differential equation formula by formula 1-1～1-4
In the formula, B is that magnetic flux density, H are magnetic induction intensity, are that current density, μ are that dielectric permeability, A are vector potential, regulation
Therefore, differential equation 1-5 and its corresponding fringe conditions just can be determined the unique numerical solution of A through finite element analysis computation.Through post processing, can derive magnetic flux density B then
0And other field amount.
2. the foundation of actual physics model
Confirm magnet each several part size according to Theoretical Calculation, utilize the comparatively cheap magnetic material of price to set up the actual physics model of a 1:1.Because Theoretical Calculation is under the ideal conditions; There are a certain distance in actual high temperature magnet model and calculation mathematic model; So the high temperature magnet model building also need pass through a series of debugging after accomplishing, accomplish the high temperature magnet of nuclear magnetic resonance logging instrument structure design.
The technical solution adopted for the present invention to solve the technical problems is: high temperature magnet of nuclear magnetic resonance logging instrument comprises magnet and magnet frame; Magnet is made up of two branch magnets; Two parallel symmetries of branch magnet are fixed on the both sides of magnet frame, and the extreme direction of two branch magnets N is identical.Every branch magnet is that the polarization angular range of seven magnetic patch is between-15 °～30 ° by seven parallel bonding forming of magnetic patch.Magnet frame adopts titanium alloy material, like TC11, TC9, TC6 or TC4.Those skilled in the art know the polarization angle of magnetic patch, here are not described in detail.
Described two parallel symmetries of branch magnet are fixed on the both sides of magnet frame, are to adopt sunk screw that two branch magnets are fixed on the magnet frame both sides.
The shape of described magnetic patch is identical, magnetic patch be shaped as arc cylinder, the thickness of magnetic patch is between 25～50mm.
For two branch magnets can be securely fixed on the magnet frame; Do not influence the magnetic of each magnetic patch again; Two branch magnets comprise parallel seven bonding magnetic patch, two contiguous blocks and two fixed blocks respectively; Two ends at parallel bonding seven magnetic patch are bonded with the contiguous block identical with the magnetic patch shape respectively, adopt attachment screw to be fixed with the fixed block identical with the magnetic patch shape respectively in the outside of two contiguous blocks, and radially dormant bolt fixing hole is arranged on the fixed block.Contiguous block and fixed block adopt titanium alloy material, like TC11, TC9, TC6 or TC4.
Before seven not bonding composition magnets of magnetic patch, need carry out burin-in process to seven magnetic patch, stable with the magnetic property that reaches each magnetic patch.
Obtain uniform magnetic field in order to regulate magnetic field intensity, the extreme portion of the N of each magnetic patch is stained with the magnetic sheet that cuts down from the extreme portion of the N of magnetic patch.The quantity of magnetic sheet is between 2～6.Behind the bonding magnetic sheet, two branch magnets are fixed on the magnet frame, and producing a cross section in the place apart from antenna surface 1.5～4cm is that quadrangle uniform magnetic field, the vertical section that caves inward is an arc uniform magnetic field, and its magnetic field deviation is 2～4Gss.High temperature magnet of nuclear magnetic resonance logging instrument of the present invention is like this said from textural classification to belong to the uniform magnetic field class.
Because high temperature magnet of nuclear magnetic resonance logging instrument is that 175 ℃, limiting pressure are 140MPa in the limiting temperature of underground work environment, so make the magnetic material of magnetic patch, selection is the necessary condition that can high temperature magnet of nuclear magnetic resonance logging instrument trouble free service.Through screening select at last that temperature stability is good for use, temperature coefficient is-0.03% the GYROS282:17SmCo magnetic material by the development of Beijing Iron and Steel Research Geueral Inst, as the magnetic material of the magnetic patch of high temperature magnet of nuclear magnetic resonance logging instrument.The GYROS282:17SmCo magnetic material has sale in Iron and Steel Research Geueral Inst functional Material Institute.
The preparation method of high temperature magnet of nuclear magnetic resonance logging instrument is:
The preparation method of high temperature magnet of nuclear magnetic resonance logging instrument comprises that magnetic patch is prepared, magnetic patch is bonding, fixing magnet, the magnetic intensity of dividing regulated and five steps of magnet embedding assembling.
1. magnetic patch is prepared
In order to obtain uniform magnetic field, adopt line cutting processing means to cut out arc magnetic patch the stock of GYROS282:17SmCo magnetic material, the polarization angular range of magnetic patch is between-15 °～30 °.2～6 magnetic sheets are downcut on the arc base of the vertical magnetic patch of the extreme portion of the N of each arc magnetic patch, and the thickness of every magnetic sheet is 3mm, and keeps the magnetic sheet that scales off, and uses when magnetic field is regulated to do.Magnetic patch and magnetic sheet magnetize respectively.Those skilled in the art know cutting and magnetization method, are not described in detail.
2. magnetic patch is bonding
Owing to receive the capacity of magnet charger and the restriction of coil dimension of magnetizing, so only after each magnetic patch magnetizes, just can carry out bonding.Each magnetic patch all has stronger magnetic, and the polarised direction between each magnetic patch has identical projecting direction in the same coordinate system, so the magnetic force between the magnetic patch shows repulsion.If be not difficult to be integral these magnetic patch are bonding by instrument, the present invention designs the bonding special tool of a cover magnetic patch for this reason.
The bonding special tool of magnetic patch is made up of casing, push pedal, screw rod and handle, and the mobile push pedal at the bottom of the vertical box is arranged in casing, and screw is arranged on box body wall, and screw rod is arranged in the screw, and an end of screw rod has handle, and the other end of screw rod is against a side that pushes away.At the bottom half of push pedal one side of the bonding special tool of magnetic patch, bonding magnetic patch is prepared in parallel discharging.On the bonding plane of magnetic patch, scribble bonding agent.Rotary handle, screw rod promote push pedal and move, and it is pinched together and bonding with seven magnetic patch to overcome magnetic field thrust, wait for that bonding agent solidifies.
3. the fixing magnet that divides
The bonding connection in magnetic patch two ends bonding to together is fast, adopts attachment screw that fixed block is fixed at the fast two ends of connection, adopts sunk screw will divide magnet to be fixed on the magnet frame.
4. magnet shimming
Dividing magnet can be to have certain deviation with Theoretical Calculation when making, and therefore divides magnet need carry out magnetic field and regulates, and makes the uniform magnetic field of magnet reach designing requirement.
To divide magnet to be fixed on the magnet frame.Adopt the magnetic field in the Hall instrumentation amount NMR logging instrument detecting area, detecting area length is 10cm.According to recording detecting area internal magnetic field distributional pattern data, carry out shimming and regulate.When the magnetic field in the measured zone of certain magnetic patch is low; Paste the magnetic sheet identical on this magnetic patch top with the magnet polarised direction; Strengthen the intensity of this regional magnetic field, the Distribution of Magnetic Field in reaching this magnetic patch measurement zone stops to paste magnetic sheet when identical with Distribution of Magnetic Field in adjacent two magnetic patch measurement zones; When certain magnetic patch measured zone is higher than other regional magnetic fields; Paste the opposite magnetic sheet of polarised direction on this magnetic patch top; Reduce this regional magnetic field intensity, the Distribution of Magnetic Field in reaching this magnetic patch measurement zone stops to paste magnetic sheet when identical with Distribution of Magnetic Field in adjacent two magnetic patch measurement zones.
Adopting this magnet control method that the homogeneity range in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field is adjusted to radius is that 2～5mm, length are 75～100mm homogeneity range.
5. high temperature magnet of nuclear magnetic resonance logging instrument embedding
Because the NMR logging instrument magnet is operated in high temperature, the hyperbaric environment,, after completion is regulated in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field, need carry out embedding to high temperature magnet of nuclear magnetic resonance logging instrument in order to guarantee magnet safety, steady operation.Make the space between high temperature magnet of nuclear magnetic resonance logging instrument and the magnet shell be full of by the high temperature casting glue fully, can withstand the pressure of 140MPa.
The high temperature magnet of nuclear magnetic resonance logging instrument embedding does not have specific (special) requirements, and those skilled in the art knows encapsulating method, is not described in detail.
The high temperature casting glue that in the embedding process, uses is the high temperature casting glue of the model of Harbin oil academy production as BJ-130.
The invention has the beneficial effects as follows, between the different magnetic patch of magnet, adopted different polarization angles, enlarge the even effect of magnet to reach; Magnetic material has been taked special burin-in process technology, so that magnet more stable work under hot conditions.This high temperature magnet can provide a field regions relatively uniformly for the NMR logging instrument system, and the volume size of this uniform field regions can satisfy the nuclear magnetic resonance log needs, and the volume of homogeneity range is bigger.And this high temperature magnet can be under 175 ℃, 140MPa condition, safe and stable operation.
Adopt advanced theory to calculate and simulation means; Solve the magnet that exists in the high temperature magnet general structure design and survey homogeneity range and cross near apart from antenna surface and problem such as the homogeneity range scope is too small, design a kind of distinguished high temperature magnet of nuclear magnetic resonance logging instrument; Adopt the practicable high temperature magnet manufacture craft of a cover, solve magnet can be in the environment of HTHP the problem of safe and stable operation; Adopt the shimming regulation technology, it is bigger to reach magnet homogeneity range volume, and the littler effect of magnet deviation in the homogeneity range makes NMR logging instrument entire system signal to noise ratio that bigger lifting arranged.
Description of drawings
Fig. 1 is a high temperature magnet of nuclear magnetic resonance logging instrument structural profile sketch map.
The schematic cross section of Fig. 2 Fig. 1.
Fig. 3 is the sketch map of bonding back of seven magnetic patch 6 and the branch magnet 2 formed with being connected of two ends fast 5 and fixed block 4.
Fig. 4 is the structural representation that a magnetic patch 6 and top are bonded with magnetic sheet 7.
Fig. 5 is the left view of Fig. 4.
Fig. 6 is magnetic patch 6 bonding special tool sketch mapes.
Fig. 7 high temperature magnet of nuclear magnetic resonance logging instrument Distribution of Magnetic Field form sketch map.
1. magnet frame wherein, 2. minute magnetic patch, 3. sunk screw, 4. fixed block, 5. contiguous block, 6. magnetic patch, 7. magnetic sheet, 8. attachment screw, 9. pushing block, 10. casing, 11. screw rods, 12. handles.
The specific embodiment
Embodiment 1:
According to above-mentioned high temperature magnet of nuclear magnetic resonance logging instrument design principle, the magnetic field intensity of utilizing finite element software to calculate the magnet home court is 550 Gausses, meets Distribution of Magnetic Field Structural Design Requirement form.Consult Fig. 7.
Consult Fig. 1.High temperature magnet of nuclear magnetic resonance logging instrument comprises magnet and magnet frame 1, and magnet is made up of two branch magnets 2, and two branch magnet 2 parallel symmetries are fixed on the both sides of magnet frame 1.Two branch magnet 2 parallel symmetries are fixed on the both sides of magnet frame 1, are to adopt sunk screw 3 that two branch magnets 2 are fixed on magnet frame 1 both sides, and the distance between two branch magnetic patch 2 is 55mm.Consult Fig. 2.The N extreme direction of two branch magnets 2 is identical.Consult Fig. 3.Every branch magnet 2 main bodys are by seven magnetic patch, 6 parallel bonding forming.The two ends of seven magnetic patch 6 are bonded with the contiguous block 5 identical with magnetic patch 6 shapes respectively, and the thickness of contiguous block 5 is 25mm.Adopt attachment screw 8 to be fixed with the fixed block 4 identical with the magnetic patch shape respectively in the outside of two contiguous blocks 5, the thickness of fixed block 4 is 50mm.Radially dormant bolt 3 fixing holes are arranged on the fixed block 4.Dividing the length of magnet 2 is 400mm.Contiguous block 5 adopts titanium alloy T C9 materials processing to become with fixed block 4.
Consult Fig. 4 and Fig. 5.Described magnetic patch 6 be shaped as arc cylinder, arc radius is 61.5mm, arc height is 92mm.The magnetic material of magnetic patch 6 is GYROS282:17SmCo magnetic materials.
Consult Fig. 3.From the magnetic patch 6 of left side 1#～7#, select different angle and the different-thickness of must polarizing for use, the 2#, the 6# magnetic patch 6 that wherein are positioned at two ends are selected little polarization angle for use, and the polarization angle is-3 °; 3#, 4# and 5# select bigger polarization angle for use, and the polarization angle is 6 °; 1#, 7# magnetic patch 6 are selected big polarization angle for use, and the polarization angle is 9 °.The thickness of 1#, 2#, 4#, 6# and 7# magnetic patch 6 is 50mm.The thickness of 3# and 5# is 25mm.This measure is applied in the magnetic field calculation, and the size that calculates the magnetic field homogeneity range at last is 6mm * 6mm * 90mm.Consult Fig. 1.Magnet frame 1 adopts titanium alloy T C9 material to process.
Before seven magnetic patch 6 are not bonding, need carry out burin-in process to seven magnetic patch 6, stable with the magnetic property that reaches each magnetic patch 6.
Consult Fig. 4 and Fig. 5.The extreme portion of the N of each magnetic patch 6 is stained with the magnetic sheet 7 that cuts down from the extreme portion of the N of magnetic patch 6.The quantity of magnetic sheet 7 is 6, the stickup quantity of decision magnetic sheet 7 when regulating magnetic field intensity.Two branch magnets 2 are fixed on the magnet frame 1, and producing a cross section in the place apart from high temperature magnet of nuclear magnetic resonance logging instrument surface 3cm is that quadrangle uniform magnetic field, the vertical section that caves inward is an arc uniform magnetic field, and its magnetic field deviation is 4Gss.
The preparation method of high temperature magnet of nuclear magnetic resonance logging instrument:
The preparation method of high temperature magnet of nuclear magnetic resonance logging instrument comprises that magnetic patch is prepared, magnetic patch is bonding, fixing magnet, the magnetic intensity of dividing regulated and five steps of magnet embedding assembling.
1. magnetic patch is prepared
Adopt line cutting processing means to cut out arc magnetic patch 6 stock of GYROS282:17SmCo magnetic material, the polarization angle and the thickness of magnetic patch 6 are seen above-mentioned.6 magnetic sheets 7 are downcut on the arc base of the vertical magnetic patch of the extreme portion of the N of each arc magnetic patch 6, and the thickness of every magnetic sheet is 3mm, and keeps the magnetic sheet 7 that scales off, and uses when magnetic field is regulated to do.Magnetic patch 6 magnetizes respectively with magnetic sheet 7.
2. magnetic patch is bonding
Consult Fig. 6.Preparation magnetic patch 6 bonding special tools.Magnetic patch 6 bonding special tools are made up of casing 10, push pedal 9, screw rod 11 and handle 12; Mobile push pedal 9 at the bottom of in casing 10, vertical box being arranged there is screw on casing 10 walls, screw rod 11 is arranged in the screw; One end of screw rod 11 has handle 12, and the other end of screw rod 11 is against a side of push pedal 9.
In casing 10 bottoms of push pedal 9 one sides of magnetic patch 6 bonding special tools, seven bonding magnetic patch 6 are prepared in parallel discharging.On the bonding plane of seven magnetic patch 6, scribble bonding agent.Rotary handle 12, screw rod 11 promote push pedal 9 and move, and it is pinched together and bonding with seven magnetic patch 6 to overcome magnetic field thrust, wait for that bonding agent solidifies.Bonding agent and setting time, no technical characterictic, those skilled in the art know.
3. the fixing magnet that divides
Consult Fig. 3.Together the bonding connection in magnetic patch 6 two ends is fast 5 bonding to, and adopts attachment screw 8 that fixed block 4 is fixing at the two ends that connect fast 5, adopts sunk screw 3 will divide magnet 2 to be fixed on the magnet frame.
4. magnet shimming
To divide magnet 2 to be fixed on the magnet frame 1.Adopt the magnetic field in the Hall instrumentation amount NMR logging instrument detecting area, detecting area length is 10cm.According to recording detecting area internal magnetic field distributional pattern data, carry out shimming and regulate.When the magnetic field in the measured zone of certain magnetic patch 6 is low; Paste the magnetic sheet 7 identical on these magnetic patch 6 tops with the magnet polarised direction; Strengthen the intensity of this regional magnetic field, the Distribution of Magnetic Field in reaching these magnetic patch 6 measurement zones stops to paste magnetic sheet 7 when identical with Distribution of Magnetic Field in adjacent two magnetic patch 6 measurement zones; When certain magnetic patch 6 measured zone is higher than other regional magnetic fields; Paste the opposite magnetic sheet 7 of polarised direction on these magnetic patch 6 tops; Reduce this regional magnetic field intensity, the Distribution of Magnetic Field in reaching these magnetic patch 6 measurement zones stops to paste magnetic sheet 7 when identical with Distribution of Magnetic Field in adjacent two magnetic patch 6 measurement zones.
Consult Fig. 7.Adopting this magnet control method that the homogeneity range in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field is adjusted to radius is 5mm, longly is the 85mm homogeneity range.Through after the adjusting of shimming, the homogeneity range size of magnetic field deviation in 4 Gausses is 5mm * 5mm * 85mm, so far accomplishes the structure design of high temperature magnet of nuclear magnetic resonance logging instrument, reached design objective originally.
5. high temperature magnet of nuclear magnetic resonance logging instrument embedding
After completion is regulated in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field, need carry out embedding to high temperature magnet of nuclear magnetic resonance logging instrument.The high temperature casting glue model of using is BJ-130.
Claims (7)
1. high temperature magnet of nuclear magnetic resonance logging instrument; It is characterized in that: comprise magnet and magnet frame (1), magnet is made up of two branch magnets (2), and the parallel symmetry of two branch magnets (2) is fixed on the both sides of magnet frame (1); The N extreme direction of two branch magnets (2) is identical; Every branch magnet (2) is by parallel bonding the forming of seven magnetic patch (6), and the polarization angular range of seven magnetic patch (6) is between-15 °～30 °, and magnet frame (1) adopts titanium alloy material.
2. high temperature magnet of nuclear magnetic resonance logging instrument according to claim 1 is characterized in that: the parallel symmetry of described two branch magnets (2) is fixed on the both sides of magnet frame (1), is to adopt sunk screw (3) that two branch magnets (2) are fixed on magnet frame (1) both sides.
3. high temperature magnet of nuclear magnetic resonance logging instrument according to claim 1 is characterized in that: described magnetic patch (6) be shaped as arc cylinder, the thickness of magnetic patch (6) is between 25～50mm.
4. high temperature magnet of nuclear magnetic resonance logging instrument according to claim 1; It is characterized in that: two branch magnets (2) comprise parallel bonding seven magnetic patch (6), two contiguous blocks (5) and two fixed blocks (4) respectively; Two ends at parallel bonding seven magnetic patch (6) are bonded with the contiguous block (5) identical with magnetic patch (6) shape respectively; Adopt attachment screw (8) to be fixed with the fixed block (4) identical respectively in the outside of two contiguous blocks (5) with the magnetic patch shape; Radially dormant bolt (3) fixing hole is arranged on the fixed block (4), and contiguous block (5) and fixed block (4) adopt titanium alloy material.
5. according to claim 1,2,3 or 4 described high temperature magnet of nuclear magnetic resonance logging instrument; It is characterized in that: the extreme portion of N of each magnetic patch (6) is stained with the magnetic sheet (7) that cuts down from the extreme portion of N of magnetic patch (6); The quantity of magnetic sheet (7) is between 2～6; Behind the bonding magnetic sheet (7); Two branch magnets (2) are fixed on the magnet frame (1), and producing a cross section in the place apart from antenna surface 1.5～4CM is that quadrangle uniform magnetic field, the vertical section that caves inward is an arc uniform magnetic field, and its magnetic field deviation is 2～4Gss.
6. according to claim 1,2,3 or 4 described high temperature magnet of nuclear magnetic resonance logging instrument, it is characterized in that: the magnetic material of magnetic patch (6) is the GYROS282:17SmCo magnetic material.
7. the preparation method of a high temperature magnet of nuclear magnetic resonance logging instrument is characterized in that:
The preparation method of high temperature magnet of nuclear magnetic resonance logging instrument comprises that magnetic patch is prepared, magnetic patch is bonding, fixing magnet, the magnetic intensity of dividing regulated and five steps of magnet embedding assembling;
1. magnetic patch is prepared
Adopt line cutting processing means to cut out arc magnetic patch (6) stock of GYROS282:17SmCo magnetic material; The polarization angular range of magnetic patch (6) is between-15 °～30 °; 2～6 magnetic sheets (7) are downcut on the arc base of the vertical magnetic patch of the extreme portion of N of each arc magnetic patch (6), and the thickness of every magnetic sheet (7) is 3mm, and keeps the magnetic sheet (7) that scales off; Use when magnetic field is regulated to do, magnetic patch (6) and magnetic sheet (7) magnetize respectively;
2. magnetic patch is bonding
Casing (10) bottom in push pedal (9) one sides of the bonding special tool of magnetic patch (6); Bonding magnetic patch (6) is prepared in parallel discharging; On the bonding plane of magnetic patch (6), scribble bonding agent, rotary handle (12), screw rod (11) promote push pedal (9) and move; It is pinched together and bonding with seven magnetic patch (6) to overcome magnetic field thrust, waits for that bonding agent solidifies; The bonding special tool of described magnetic patch (6) is made up of casing (10), push pedal (9), screw rod (11) and handle (12); Mobile push pedal (9) at the bottom of in casing (10), vertical box being arranged; On casing (10) wall, screw is arranged; Screw rod (11) is arranged in the screw, and an end of screw rod (11) has handle (12), and the other end of screw rod (11) is against a side of push pedal (9);
3. the fixing magnet that divides
At the bonding contiguous blocks in magnetic patch (6) two ends (5) that bond to together, adopt attachment screw (8) that fixed block (4) is fixing at the two ends of contiguous block (5), adopt sunk screw (3) will divide magnet (2) to be fixed on the magnet frame (1);
4. magnet shimming
To divide magnet (2) to be fixed on the magnet frame (1); Adopt the magnetic field in the Hall instrumentation amount NMR logging instrument detecting area; Detecting area length is 10cm, according to recording detecting area internal magnetic field distributional pattern data, carries out shimming and regulates; When the magnetic field in the measured zone of certain magnetic patch (6) is low; Paste the magnetic sheet (7) identical with the magnet polarised direction on this magnetic patch (6) top, strengthen the intensity of this regional magnetic field, the Distribution of Magnetic Field in reaching this magnetic patch (6) measurement zone stops to paste magnetic sheet (7) when identical with Distribution of Magnetic Field in adjacent two magnetic patch (6) measurement zone; When certain magnetic patch (6) measured zone is higher than other regional magnetic fields; Paste the opposite magnetic sheet (7) of polarised direction on this magnetic patch (6) top; Reduce this regional magnetic field intensity; Distribution of Magnetic Field in reaching this magnetic patch (6) measurement zone stops to paste magnetic sheet (7) when identical with Distribution of Magnetic Field in adjacent two magnetic patch (6) measurement zone
Adopting this magnet control method that the homogeneity range in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field is adjusted to radius is that 2～5mm, length are 75～100mm homogeneity range;
5. high temperature magnet of nuclear magnetic resonance logging instrument embedding
After completion is regulated in high temperature magnet of nuclear magnetic resonance logging instrument magnetic field, need carry out embedding to high temperature magnet of nuclear magnetic resonance logging instrument, the high temperature casting glue model of use is BJ-130.
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| CN101907586B (en) * | 2010-06-11 | 2012-03-07 | 中国石油天然气股份有限公司 | High-temperature high-pressure clamp for testing rock core by nuclear magnetic resonance |
| 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 |
| CN104912550B (en) * | 2015-05-05 | 2018-08-03 | 中国海洋石油集团有限公司 | A kind of NMR logging data quantitatively calculates reservoir production profile method |
| 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 |
| WO2018067767A1 (en) | 2016-10-05 | 2018-04-12 | Schlumberger Technology Corporation | Magnet design |
| 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757186A (en) * | 1996-02-23 | 1998-05-26 | Western Atlas International, Inc. | Nuclear magnetic resonance well logging apparatus and method adapted for measurement-while-drilling |
| CN1235236A (en) * | 1998-05-08 | 1999-11-17 | 中国科学院武汉物理与数学研究所 | Permanent magnet for NMR logging instrument |
| CN1564273A (en) * | 2004-04-05 | 2005-01-12 | 北京大学 | Permanent magnet used for portable NMR appts. |
| CN101098047A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Nuclear magnetic resonance logging instrument probe antenna |
| 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 |
-
2008
- 2008-09-03 CN CN2008101195618A patent/CN101343998B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757186A (en) * | 1996-02-23 | 1998-05-26 | Western Atlas International, Inc. | Nuclear magnetic resonance well logging apparatus and method adapted for measurement-while-drilling |
| CN1235236A (en) * | 1998-05-08 | 1999-11-17 | 中国科学院武汉物理与数学研究所 | Permanent magnet for NMR logging instrument |
| CN1564273A (en) * | 2004-04-05 | 2005-01-12 | 北京大学 | Permanent magnet used for portable NMR appts. |
| CN101098047A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Nuclear magnetic resonance logging instrument probe antenna |
| 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 |
Non-Patent Citations (3)
| Title |
|---|
| 刘卫等.核磁共振测井仪研制与开发.《现代科学仪器》.2008,(第04期), * |
| 王瑞清等.核磁共振成像测井仪磁体设计方法.《石油仪器》.2006,第20卷(第06期), * |
| 胡法龙等.核磁共振测井仪典型探头设计分析.《石油机械》.2006,第34卷(第08期), * |
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