CN109236283A - NMR logging instrument probe and NMR logging instrument - Google Patents
NMR logging instrument probe and NMR logging instrument Download PDFInfo
- Publication number
- CN109236283A CN109236283A CN201811030439.3A CN201811030439A CN109236283A CN 109236283 A CN109236283 A CN 109236283A CN 201811030439 A CN201811030439 A CN 201811030439A CN 109236283 A CN109236283 A CN 109236283A
- Authority
- CN
- China
- Prior art keywords
- magnet
- coil
- logging instrument
- nmr logging
- pair
- 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.)
- Pending
Links
- 239000000523 sample Substances 0.000 title claims abstract description 47
- 230000001235 sensitizing effect Effects 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 30
- 230000035699 permeability Effects 0.000 claims description 24
- 230000004323 axial length Effects 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000005481 NMR spectroscopy Methods 0.000 abstract description 67
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 238000003384 imaging method Methods 0.000 abstract description 5
- 238000002595 magnetic resonance imaging Methods 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- 230000005284 excitation Effects 0.000 description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of NMR logging instrument probe and NMR logging instruments, comprising: magnet assembly, coil array and coil control switching circuit.Magnet assembly includes: magnet and support rod, and magnet is fixed on support rod, and magnet is used to generate the rotational symmetry magnetic field of radial radiation.Coil array includes multiple identical coils, coil array is set in qually spaced in the periphery of magnet assembly along axial direction, each coil can motivate and receive the signal of the sensitizing range of corresponding orientation angles range, the signal of the corresponding sensitizing range of each coil is not overlapped, coil control switching circuit is connect with coil array, switching of the coil control switching circuit for the coil in control coil array.By this programme, underground high resolution nuclear magnetic resonance scanning imagery may be implemented, so that user can accurately judge that formation information according to MRI scan imaging results, be conducive to the exploitation exploitation of diposits of petroleum.
Description
Technical field
The present invention relates to petroleum detection technical fields more particularly to a kind of NMR logging instrument probe and nuclear magnetic resonance to survey
Well instrument.
Background technique
Nuclear magnetic resonance (Nuclear Magnetic Resonance, abbreviation NMR) technology is widely used in physics, changes
The fields such as, material science, life science, medicine, well measurement.
NMR Logging Technology is detected using stratum of the nuclear magnetic resonance principle to wellbore.With electrical method, sound
Wave is compared with Developing Nuclear logging Instruments technology, and nuclear magnetic resonance log biggest advantage is the fluid information only measured in stratum, signal
It is not influenced by rock matrix, qualitative recognition and quantitative assessment ability with unique reservoir fluid.In addition, nuclear magnetic resonance is surveyed
Well information can also calculate clay-bound water, hollow billet irreducible water and free fluid content, estimate viscosity of crude and rock pore structure
Deng.
Currently, Nuclear Magnetic Resonance Measurement is mainly realized by following some steps, sensed by nuclear magnetic resonance log device
Device magnet generates magnetostatic field B0, it is used for so that spin Hydrogen Proton magnetization vector is along magnetostatic field B0Arrangement.In order to establish thermal balance,
Spin Hydrogen Proton must adequately be polarized in magnetostatic field, and the magnetic polarization time is relaxation time T1.The Hydrogen Proton that spins is obtaining
To after abundant polarization, by radio-frequency coil transmitting and magnetostatic field B0Perpendicular electromagnetic field B1Carry out switching.Initial radio frequency pulse is known as 90 °
Pulse.After the 90 pulse, spin proton start along magnetostatic field carry out precession, due to magnetostatic field heterogeneity and can not
Inverse proton precession, spin proton starts dephasing, to generate inductive signal.However, dephasing process is that part is reversible, pass through
Apply 180 ° of radio-frequency pulses, instantaneous phase can be inverted, to start rephasing.The reunion of proton phase can generate inductive signal, into
And continue that dephasing occurs, it repeats constantly, until signal completely disappears.
Existing NMR logging instrument is broadly divided into cable NMR logging instrument by function and surveys with brill nuclear magnetic resonance
Two kinds of well instrument.Wherein, probe is to excite nmr phenomena under oil/gas well and receive the critical component of NMR signal, is visited
The structure design of head determines measurement method, the resonance zone for generating nuclear magnetic resonance and NMR signal intensity of logging instrument etc.
Key performance.Probe mainly includes magnet and antenna, and magnet is for generating magnetostatic field in the stratum of wellbore, to stratum
In fluid oil air water in hydrogen atom excited, antenna be used for stratum transmitting radio-frequency pulse to form pulsed magnetic field, lead to
It crosses in pulsed magnetic field excitation stratum and nmr phenomena is generated by the polarized hydrogen atom of the magnetostatic field, be also used to simultaneously
Receive and acquire the NMR signal that the hydrogen atom on stratum generates.
Due to the proposition of frequency multiplexing technique, NMR logging instrument can only measure some direction or how deep comprehensive multifrequency is
The two-dimensional space information of degree, and existing nuclear magnetic resonance logging instrument is all based on simple homogenieity for the measurement on stratum
Stratigraphic model structure, it is believed that the one direction on a certain interval stratum or comprehensive average signal can correctly reflect the property on the stratum
Matter.However, stratum is not complete homogenieity stratum.Existing NMR logging instrument experience complicated heterogeneity stratum,
Part slurry compounding and wellbore collapse condition the case where it is very much, the appearance meeting of the above situation prevent staff from basis
Nuclear Magnetic Resonance Measurement result accurately judges that stratum.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of NMR logging instrument probe and NMR logging instrument, with
Just user can accurately judge that formation information according to Nuclear Magnetic Resonance Measurement result.
In a first aspect, the embodiment of the invention provides a kind of NMR logging instrument probes, comprising: magnet assembly, line
Enclose array and coil control switching circuit；
The magnet assembly includes: magnet and support rod, and the magnet is fixed on support rod, and the magnet is for producing
The rotational symmetry magnetic field of raw radial radiation；
The coil array includes multiple identical coils, and the coil array is set in qually spaced in the magnet along axial direction
The periphery of assembly；Each coil is used to motivate and receive the signal of the sensitizing range of corresponding orientation angles range, each
The signal of the corresponding sensitizing range of the coil is not overlapped；
The coil control switching circuit is connect with the coil array, and the coil control switching circuit is for controlling institute
State the switching of the coil in coil array.
With reference to first aspect, the embodiment of the invention provides the first possible embodiment of first aspect, the magnetic
Body assembly be hollow cylinder, the magnet of the magnet assembly is radially substantially symmetrical about its central axis, radially central axis by as far as
Closely it is disposed with a pair of of main magnet, a pair of of high permeability material magnet and a pair of of focusing magnet；
The magnetizing direction of the pair of main magnet is axial and contrary along the magnet assembly, the pair of main magnetic
The identical one end of two main magnet polarity is oppositely arranged in body；
The magnetizing direction of the pair of focusing magnet is along the radial center axis direction rotational symmetry；
The pair of high permeability material magnet is used to elongate the genesis analysis in the magnetic field.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides second of first aspect
Possible embodiment, the pair of focusing magnet include: a pair of long focusing magnet and a pair of short focusing magnet；
The pair of long focusing magnet is close to the radial central axis, and the pair of short focusing magnet is far from the radial direction
Mandrel.
The possible embodiment of second with reference to first aspect, the embodiment of the invention provides the third of first aspect
Possible embodiment, the magnet further include: without magnetic filling block；
The no magnetic filling block is arranged between the main magnet and the short focusing magnet, the short focusing magnet and institute
It states between long focusing magnet and between the long focusing magnet and the high permeability material magnet；
Wherein, the axial length without magnetic filling block between the main magnet and the short focusing magnet is the first present count
Value, the axial length without magnetic filling block between the short focusing magnet and the long focusing magnet are the second default value, institute
Stating the axial length between long focusing magnet and the high permeability material magnet without magnetic filling block is third default value.
The third possible embodiment with reference to first aspect, the embodiment of the invention provides the 4th kind of first aspect
The outer diameter of possible embodiment, the main magnet is greater than the focusing magnet, the high permeability material magnet and the nothing
The outer diameter of the outer diameter of magnetic filling block, the focusing magnet, the high permeability material magnet and the no magnetic filling block is equal.
With reference to first aspect, the embodiment of the invention provides the 5th kind of possible embodiment of first aspect, the branch
Strut runs through the magnet, fixes the support rod and the magnet in the upper and lower ends of the magnet assembly.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides the 6th kind of first aspect
Possible embodiment, the focusing magnet are spliced using the magnet of multiple preset vols.
With reference to first aspect, the embodiment of the invention provides the 7th kind of possible embodiment of first aspect, the lines
The structure for enclosing each coil in array is longitudinal coiling, and is in the special-shaped solenoid structure of arc surfaced.
The 7th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 8th kind of first aspect
Possible embodiment, each coil is formed by copper wire winding in the coil array.
With reference to first aspect, the embodiment of the invention provides the 9th kind of possible embodiment of first aspect, the lines
Circle control switching circuit is located at the upper end of the coil array.
With reference to first aspect, the embodiment of the invention provides the tenth kind of possible embodiment of first aspect, the lines
Each coil is electrically connected with the coil control switching circuit respectively by corresponding pin line in circle array.
Second aspect, the embodiment of the invention provides a kind of NMR logging instruments, comprising: a transmitter, one connects
Receive NMR logging instrument probe described in the tenth kind of possible embodiment of device and first aspect to first aspect；
Wherein, the transmitter and the receiver respectively with the coil switching control of the NMR logging instrument probe
Circuit connection；
The transmitter carries in the switching command for sending switching command to the coil control switching circuit
Switching coil mark；
The coil control switching circuit for receiving the switching command, and is identified according to the switching coil and is carried out
The switching of coil；
The receiver, the signal of the sensitizing range of the correspondence orientation angles range of the coil for receiving switching.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiment of second aspect, the cores
Magnetic resonance logging instrument further include: duplexer；
The duplexer is connect with the transmitter and the receiver respectively；
The duplexer is isolated for transmitter transmitting signal and the receiver to be received signal.
NMR logging instrument probe and NMR logging instrument provided by the invention, comprising: magnet assembly, coil battle array
Column and coil control switching circuit.Wherein, magnet assembly includes: magnet and support rod, and magnet is fixed on support rod, magnet
For generating the rotational symmetry magnetic field of radial radiation.Coil array includes multiple identical coils, and coil array is between axial wait
Away from the periphery that magnet assembly is arranged in, each coil can motivate and receive the letter of the sensitizing range of corresponding orientation angles range
Number, the signal of the corresponding sensitizing range of each coil is not overlapped, and coil control switching circuit is connect with coil array, and coil is cut
Change switching of the control circuit for the coil in control coil array.In the solution of the present invention, by the way that scanning probe signal is arranged
The coil array not overlapped, can carry out accurate scan comprehensive to NMR logging instrument probe stratum, to realize well
Lower high resolution nuclear magnetic resonance scanning imagery, so that user can carry out formation information according to MRI scan imaging results
It accurately judges that, is conducive to the exploitation exploitation of diposits of petroleum.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments be also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.
Fig. 1 is the structural schematic diagram for the NMR logging instrument probe that the embodiment of the present invention one provides；
The structural schematic diagram of magnet assembly in the NMR logging instrument probe that Fig. 2 provides for the embodiment of the present invention one；
Fig. 3 is the structural schematic diagram for the NMR logging instrument probe coil array that the embodiment of the present invention one provides；
More slice sensitizing ranges form signal of unicoil excitation in the coil array that Fig. 4 provides for the embodiment of the present invention one
Figure；
Fig. 5 is the multi-faceted detection sensitizing range form schematic diagram for the coil array excitation that the embodiment of the present invention one provides；
Fig. 6 is the structural schematic diagram of magnet assembly in NMR logging instrument probe provided by Embodiment 2 of the present invention；
Fig. 7 is the variation schematic diagram of magnetic field strength provided by Embodiment 2 of the present invention distance along longitudinal direction；
Fig. 8 is the matched schematic diagram in magnetic field provided by Embodiment 2 of the present invention；
Fig. 9 is the schematic diagram that NMR logging instrument probe provided by Embodiment 2 of the present invention is formed by Distribution of Magnetic Field；
Figure 10 is the structural schematic diagram for the NMR logging instrument that the embodiment of the present invention three provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Every other reality obtained based on the embodiments of the present invention
Example is applied, shall fall within the protection scope of the present invention.
NMR logging instrument in the embodiment of the present invention can be used in vertical well, slant well or even horizontal well, because
This, the drilling direction of NMR logging instrument is the extending direction of the central axis of NMR logging instrument probe, i.e., " axial direction ", but
It is not necessarily vertical；But it for convenience of explanation, in embodiment, will be illustrated for being used for vertical well, that is to say, that
" axial direction " refers to vertical in following embodiments.But the content of the present embodiment is not limitation of the invention.
For convenience of explanation, the size for the different layer and region that zoomed in or out, so size as shown in the figure and ratio
Actual size might not be represented, does not also reflect the proportionate relationship of size.
Embodiment one
In the embodiment of the present invention one, as shown in Figure 1, the NMR logging instrument probe 1, comprising: magnet assembly 11, line
Enclose array 12 and coil control switching circuit 13.
As shown in Fig. 2, magnet assembly 11 includes: magnet 110 and support rod 116, magnet 110 is fixed on support rod 116
On, magnet 110 is used to generate the rotational symmetry magnetic field of radial radiation.
As shown in figure 3, coil array 12 includes multiple identical coils 121, coil array 12 is along axial spaced set
In the periphery of magnet assembly 11.Each coil 121 is used to motivate and receive the letter of the sensitizing range of corresponding orientation angles range
Number, the signal of the corresponding sensitizing range of each coil 121 is not overlapped.
Coil control switching circuit 13 is connect with coil array 12, and coil control switching circuit 13 is used for control coil array
The switching of coil 121 in 12.
In the present embodiment, as shown in Fig. 2, specifically, magnet assembly 11 is made of a pair of magnets 110 and support rod 116,
A pair of magnets 110 is located at the most both ends of magnet assembly 11, and magnetizing direction is that along axial direction and on the contrary, can be formed in the earth formation
The rotational symmetry magnetic field of radial radiation.Support rod 116 runs through entire magnet assembly 11, with the NMR logging instrument probe 1
The component mechanical combination of upper and lower side is support and the load-supporting part of entire NMR logging instrument probe 1.
In the present embodiment, specifically, coil array 12 is used to realize the scanning imagery of NMR logging instrument probe 1
Excitation is received with signal.It is illustrated in figure 3 loop construction and the distribution of coil array 12.Coil array 12 can be by multiple structures
Coil unit identical with electrical property is composed, such as 8, to guarantee the consistency of measurement.Preferably, coil array 12
In the structure of each coil can be longitudinal coiling, and be in the special-shaped solenoid structure of arc surfaced, each line in coil array 12
Circle is formed by copper wire winding.Coil array 12 is set in qually spaced in the periphery of magnet assembly 11 along axial direction.Each coil 121 is used
In the signal of excitation and the sensitizing range for receiving corresponding orientation angles range, the signal of the corresponding sensitizing range of each coil 121
It is not overlapped.In the present embodiment, coil control switching circuit 13 is connect with coil array 12, and coil control switching circuit 13 is used
The switching of coil 121 in control coil array 12.Preferably, coil control switching circuit 13 is located at the upper of coil array 12
End.Preferably, each coil is electrically connected with coil control switching circuit 13 respectively by corresponding pin line in coil array 12.It is excellent
Choosing, coil control switching circuit 13 is using highly sensitive, high switching rate and high-temperature and high-presure resistent electronic switch is come control line
Switching between circle.
For example, coil array 12 is made of 8 coils 121, the ground around the scanning of NMR logging instrument probe 1
When layer, the sensitizing range of 8 different directions, homomorphosis but no signal overlapping region, the sensitizing range shape of excitation can be motivated
State is 45 ° of shell shapes.It is illustrated in figure 4 the form for the different depth sensitizing range that single coil is motivated, on transverse plane,
The sensitizing range form of different depth is all 45 ° of shell shapes.Further, in practical application, coil array 12 motivates not Tongfang
The sensitizing range of position no signal overlapping is as shown in Figure 5.Fig. 5 is reflected under single working frequency, the difference that coil array 12 motivates
Form of the sensitizing range in orientation on transverse plane.It can be seen that non-overlapping part between sensitizing range, therefore each region
No signal overlapping, and the sum of sensitizing range form in all directions is the cylindrical shell form of thin wall hollow type, therefore scanning imagery obtains
To realize.
NMR logging instrument probe provided in this embodiment, comprising: magnet assembly, coil array and coil switching control
Circuit processed.Wherein, magnet assembly includes: magnet and support rod, and magnet is fixed on support rod, and magnet is for generating radial spoke
The rotational symmetry magnetic field penetrated.Coil array includes multiple identical coils, and coil array is set in qually spaced in magnet dress along axial direction
The periphery of ligand, each coil can motivate and receive the signal of the sensitizing range of corresponding orientation angles range, each coil pair
The signal for the sensitizing range answered is not overlapped, and coil control switching circuit is connect with coil array, and coil control switching circuit is used
The switching of coil in control coil array.In the present solution, the coil array not overlapped by the way that scanning probe signal is arranged,
Can carry out accurate scan comprehensive to NMR logging instrument probe stratum, to realize that underground high resolution nuclear magnetic resonance is swept
Imaging is retouched, so that user can accurately judge that formation information according to MRI scan imaging results, is conducive to stone
The exploitation exploitation of oil field hiding.
Embodiment two
On the basis of the above embodiment 1, as shown in fig. 6, the NMR logging instrument that the embodiment of the present application two provides is visited
In head, magnet assembly 11 is hollow cylinder, and radially central axis r is symmetrical for the magnet of magnet assembly 11, radially center
Axis r is by as far as being closely disposed with a pair of of main magnet 111, a pair of of high permeability material magnet 114 and a pair of of focusing magnet.The a pair
Focusing magnet may include: a pair of long focusing magnet 113 and a pair of short focusing magnet 112.A pair of long focusing magnet 113 is close to diameter
To central axis r, a pair of short focusing magnet 112 is far from radial central axis.
The magnetizing direction of a pair of of main magnet 111 is along the axial and contrary of magnet assembly 11, a pair of of main magnet 111
The identical one end of two main magnet polarity is oppositely arranged.
The magnetizing direction of a pair of of focusing magnet radially the direction central axis r rotational symmetry.
A pair of of high permeability material magnet 114 is used to elongate the genesis analysis in magnetic field.
In practical application, specifically, a pair of of main magnet 111 is identical as above-mentioned magnet 110, and the magnetic field of generation is main magnetization
?.Increased a pair of focusing magnet may include: a pair of long focusing magnet 113 and a pair of short focusing magnet 112, magnetizing direction
The radially direction central axis r rotational symmetry generates enhanced magnetic field to play the role of focusing to main magnetization field, enhances main magnetization
Penetrating power of the field on stratum.Increased a pair of high permeability material magnet 114, the genesis analysis of main magnetization field can be elongated,
To improve the longitudinal uniformity of main magnetization field.
In practical application, 114 front and back of short focusing magnet 112, long focusing magnet 113 and high permeability material magnet is being introduced
The variation of magnetic field strength distance along longitudinal direction is as shown in Figure 7.Identical mark shape represents different target acquisition depth in Fig. 7,
Longitudinal magnetic field intensity distribution before filled marks representing optimized, the magnetic field distribution after open symbols representing optimized.300mm's
Changes of magnetic field degree (uniformity) in longitudinal extent is that the changes of magnetic field degree in the longitudinal extent of 4.7%, 200mm is
1.4%.Meanwhile by Fig. 7 it can be seen that, magnetic field strength is introducing short focusing magnet 112, long focusing magnet 113 and high magnetic conduction material
There is great promotion after material magnet 114.
In the present embodiment, since the magnetic field of the generation of magnet assembly 11 is the rotational symmetry magnetic field of radial radiation, thus
Good magnetic field can be formed with RF magnetic field caused by coil array 12 to match.As shown in figure 8, reflecting single coil institute
The radiofrequency field of generation is matched with magnetic field of the magnetic field caused by magnet assembly 11 in sensitizing range position 21.In transverse plane
On, the direction of radiofrequency field exists only in the front of coil as shown in the Distribution of Magnetic Field among Fig. 8, and radio frequency field direction follows
Fig. 8 outwardly direction is directed toward in right-hand rule, thumb direction.
It is noted that a pair of of main magnet 111, a pair of of high permeability material magnet 114 and a pair of long 113 and of focusing magnet
The distance between a pair of short focusing magnet 112 relative position is adjustable.
In order to be adjusted between main magnet 111, high permeability material magnet 114 and long focusing magnet 113 and short focusing magnet 112
Gap after whole is filled, and prevents magnet play and lateral displacement up and down, it is preferred that above-mentioned magnet can also include: no magnetic
Filling block 115.
No magnetic filling block 115 is arranged between main magnet 111 and short focusing magnet 112, short focusing magnet 112 and length focus
Between magnet 113 and between long focusing magnet 113 and high permeability material magnet 114.
Wherein, the axial length without magnetic filling block 115 between main magnet 111 and short focusing magnet 112 is first default
Numerical value, the axial length without magnetic filling block 115 between short focusing magnet 112 and long focusing magnet 114 are the second default value,
Axial length between long focusing magnet 113 and high permeability material magnet 114 without magnetic filling block 115 is third default value.
The making material of no magnetic filling block 115 can be high-intensity non-magnetic metal block or glass bloom, be also possible to it
His high-intensity non-magnetic material, the present invention is it is not limited here.
In practical application, specifically, using the gap between magnet after the filling adjustment of no magnetic filling block 115, it can prevent
Play and lateral displacement above and below magnet.By the way that no 115 axial length of magnetic filling block is adjusted flexibly, to optimize magnet assembly
Axial distance in body 11 between each magnet, can make magnet assembly 11 generate magnetic field reach maximum intensity, infiltration away from
And length longest optimization maximum from most deep, longitudinal uniformity.
Specifically, magnetic field distribution and the magnetic vector distribution in magnetic field are as shown in Figure 9 in the present embodiment.Fig. 9 left figure is anti-
It has reflected under axisymmetric coordinate, magnetic field strength distribution of contours caused by magnet assembly 11.The magnet assembly 11 generates
Magnetic field have stronger penetration power, in target measurement stratum, uniformity of magnetic field of the magnetic field strength in axially longer range
It is higher, it is located at the stratum inside wellbore on the outside of the NMR logging instrument probe 1, no Distribution of Magnetic Field, to guarantee that measurement will not be by
The interference of mud in wellbore.Fig. 8 right figure reflects under axisymmetric coordinate, and the two dimension of the magnetic direction of magnet assembly 11 is flat
EDS maps, it can be seen that radially central axis r rotational symmetry projects by 11 central part of magnet assembly in magnetic field, returns from upper end
Magnet assembly 11 is returned, and in certain longitudinal extent, magnetic direction always keeping parallelism.
Preferably, in order to guarantee optimal magnet assembling structure, in a kind of embodiment, the outer diameter of main magnet 111 is greater than
Short focusing magnet 112, long focusing magnet 113, high permeability material magnet 114 and the outer diameter without magnetic filling block 115, short focusing magnet
112, long focusing magnet 113, high permeability material magnet 114 and outer diameter without magnetic filling block 115 are equal.The length of main magnet 111
The ratio between the distance between a pair of of main magnet 111 interval can be 8 times of relationships.
In another embodiment, support rod 116 runs through magnet, magnet assembly 11 upper and lower ends by support rod
116 fix with magnet.
Specifically, the upper and lower ends of magnet assembly 11 by the fixed mode of support rod 116 and magnet can there are many,
For example fixed with titanium steel screw or other fixed forms, the present invention is it is not limited here.Preferably, support rod 116 can be adopted
With nonmagnetic steel or titanium steel to guarantee mechanical strength, other non-magnetic high-strength materials also can be used, the present invention does not limit herein
It is fixed.
In another embodiment, focusing magnet can be spliced using the magnet of multiple preset vols.
Specifically, focusing magnet can be spliced using the smaller size smaller magnet of multiple radial magnetizings, so that enhancing is poly-
The magnetic property of burnt magnet.
NMR logging instrument probe provided in this embodiment, magnet assembly are hollow cylinder, magnet assembly
Magnet is radially substantially symmetrical about its central axis, and radially central axis is by as far as being closely disposed with a pair of of main magnet, a pair of of high permeability material
Magnet and a pair of of focusing magnet, the magnetizing direction of a pair of of main magnet is along the axial and contrary of magnet assembly, a pair of main magnetic
The identical one end of two main magnet polarity is oppositely arranged in body, and radially central axis direction rotates the magnetizing direction of a pair of of focusing magnet
Symmetrically, a pair of of high permeability material magnet is used to elongate the genesis analysis in magnetic field.In the present solution, magnetic field strength is introducing focusing magnetic
There is great promotion after body and high permeability material magnet, is conducive to carry out NMR logging instrument probe surrounding formation full side
Position accurate scan, so that underground high resolution nuclear magnetic resonance scanning imagery is realized, so that user can be according to MRI scan
Imaging results accurately judge that formation information, are conducive to the exploitation exploitation of diposits of petroleum.
Embodiment three
Figure 10 is the structural schematic diagram for the NMR logging instrument that the embodiment of the present invention three provides, as shown in Figure 10, the core
Magnetic resonance logging instrument includes: a transmitter 131, the nuclear magnetic resonance in a receiver 132 and such as embodiment 1 and embodiment 2
Logging instrument probe 1.
Wherein, transmitter 131 and receiver 132 respectively with the coil control switching circuit of NMR logging instrument probe 1
13 connections.
Transmitter 131 carries switching coil in switching command for sending switching command to coil control switching circuit 13
Mark.
Coil control switching circuit 13 for receiving switching command, and identifies the switching for carrying out coil according to switching coil.
Receiver 132, the signal of the sensitizing range of the correspondence orientation angles range of the coil for receiving switching.
Preferably, interfering with each other when being carried out simultaneously in order to avoid transmitting signal with reception signal, the nuclear magnetic resonance log
Instrument can also include: duplexer 133.
Duplexer 133 is connect with transmitter 131 and receiver 132 respectively, for transmitter 131 to be emitted signal and reception
Device 132 receives signal and is isolated.
Preferably, in order to transmitter 131 in NMR logging instrument emit signal and receiver 132 receive signal and
Coil control switching circuit 13 is managed collectively, and a ground system 134 as shown in Figure 10 can be set.
In the present embodiment, specifically, the lead-foot-line of coil array 12 is directly accessed in coil control switching circuit 13, coil
The upper end of control switching circuit 13 is directly attached with transmitter 131 and receiver 132, all coils in coil array 12
A transmitter 131 and a receiver 132 are shared, the complexity of electronic circuit is reduced.It is cut by 134 control coil of ground system
It changes control circuit 13, transmitter 131 and receiver 132 and carries out the scanning and excitation of coil array 12, signal reception and image procossing.
The implementation of the magnetic resonance logging instrument probe may refer to embodiment one and embodiment two, and overlaps will not be repeated.
Magnetic resonance logging instrument provided in this embodiment can carry out NMR logging instrument probe surrounding formation comprehensive
Accurate scan, to realize underground high resolution nuclear magnetic resonance scanning imagery, so as to user can according to MRI scan at
As result accurately judges that formation information, be conducive to the exploitation exploitation of diposits of petroleum.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (13)
1. a kind of NMR logging instrument probe characterized by comprising magnet assembly, coil array and coil switching control
Circuit processed；
The magnet assembly includes: magnet and support rod, and the magnet is fixed on support rod, and the magnet is for generating diameter
To the rotational symmetry magnetic field of radiation；
The coil array includes multiple identical coils, and the coil array is set in qually spaced in the magnet assembly along axial direction
The periphery of body；Each coil is used to motivate and receive the signal of the sensitizing range of corresponding orientation angles range, each described
The signal of the corresponding sensitizing range of coil is not overlapped；
The coil control switching circuit is connect with the coil array, and the coil control switching circuit is for controlling the line
Enclose the switching of the coil in array.
2. NMR logging instrument probe according to claim 1, which is characterized in that the magnet assembly is hollow circle
The magnet of cylinder, the magnet assembly is radially substantially symmetrical about its central axis, and radially central axis is by being disposed with a pair as far as close
Main magnet, a pair of of high permeability material magnet and a pair of of focusing magnet；
The magnetizing direction of the pair of main magnet is axial and contrary along the magnet assembly, in the pair of main magnet
The identical one end of two main magnet polarity is oppositely arranged；
The magnetizing direction of the pair of focusing magnet is along the radial center axis direction rotational symmetry；
The pair of high permeability material magnet is used to elongate the genesis analysis in the magnetic field.
3. NMR logging instrument probe according to claim 2, which is characterized in that the pair of focusing magnet includes:
A pair of long focusing magnet and a pair of short focusing magnet；
The pair of long focusing magnet is close to the radial central axis, and the pair of short focusing magnet is far from the radial center
Axis.
4. NMR logging instrument probe according to claim 3, which is characterized in that the magnet further include: no magnetic is filled out
Fill block；
The no magnetic filling block is arranged between the main magnet and the short focusing magnet, the short focusing magnet and the length
Between focusing magnet and between the long focusing magnet and the high permeability material magnet；
Wherein, the axial length without magnetic filling block between the main magnet and the short focusing magnet is the first default value,
The axial length without magnetic filling block between the short focusing magnet and the long focusing magnet is the second default value, the length
Axial length between focusing magnet and the high permeability material magnet without magnetic filling block is third default value.
5. NMR logging instrument probe according to claim 4, which is characterized in that the outer diameter of the main magnet is greater than institute
State the outer diameter of focusing magnet, the high permeability material magnet and the no magnetic filling block, the focusing magnet, the high magnetic conduction
The outer diameter of material magnet and the no magnetic filling block is equal.
6. NMR logging instrument probe according to claim 1, which is characterized in that the support rod runs through the magnetic
Body fixes the support rod and the magnet in the upper and lower ends of the magnet assembly.
7. NMR logging instrument probe according to claim 2, which is characterized in that the focusing magnet is using multiple pre-
If the magnet of volume is spliced.
8. NMR logging instrument probe according to claim 1, which is characterized in that each coil in the coil array
Structure be longitudinal coiling, and be in the special-shaped solenoid structure of arc surfaced.
9. NMR logging instrument probe according to claim 8, which is characterized in that each coil in the coil array
It is formed by copper wire winding.
10. NMR logging instrument probe according to claim 1, which is characterized in that the coil control switching circuit
Positioned at the upper end of the coil array.
11. NMR logging instrument probe according to claim 1, which is characterized in that each line in the coil array
Circle is electrically connected with the coil control switching circuit respectively by corresponding pin line.
12. a kind of NMR logging instrument characterized by comprising a transmitter, a receiver and such as claim 1-
11 described in any item NMR logging instrument probes；
Wherein, the transmitter and the receiver respectively with the coil control switching circuit of the NMR logging instrument probe
Connection；
The transmitter carries switching in the switching command for sending switching command to the coil control switching circuit
Coil mark；
The coil control switching circuit for receiving the switching command, and identifies according to the switching coil and carries out coil
Switching；
The receiver, the signal of the sensitizing range of the correspondence orientation angles range of the coil for receiving switching.
13. NMR logging instrument according to claim 12, which is characterized in that further include: duplexer；
The duplexer is connect with the transmitter and the receiver respectively；
The duplexer is isolated for transmitter transmitting signal and the receiver to be received signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030439.3A CN109236283A (en) | 2018-09-05 | 2018-09-05 | NMR logging instrument probe and NMR logging instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030439.3A CN109236283A (en) | 2018-09-05 | 2018-09-05 | NMR logging instrument probe and NMR logging instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109236283A true CN109236283A (en) | 2019-01-18 |
Family
ID=65060634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811030439.3A Pending CN109236283A (en) | 2018-09-05 | 2018-09-05 | NMR logging instrument probe and NMR logging instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109236283A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030809A (en) * | 2021-02-27 | 2021-06-25 | 浙江大学 | Vertical aperture nuclear magnetic resonance tester |
| CN113216948A (en) * | 2021-05-19 | 2021-08-06 | 中国石油大学(北京) | Multi-coil-structure while-drilling nuclear magnetic resonance logging device and method |
| CN114089232A (en) * | 2021-11-25 | 2022-02-25 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
| CN115234219A (en) * | 2022-08-16 | 2022-10-25 | 中国海洋石油集团有限公司 | Nuclear magnetic resonance probe and downhole operation tool |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101860A (en) * | 1985-04-01 | 1987-01-10 | N·V·菲利浦光灯制造公司 | Nuclear magnetic resonance analyser |
| 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 |
| CN2823554Y (en) * | 2005-07-07 | 2006-10-04 | 中国石化集团胜利石油管理局测井公司 | Nuclear magnetic resonance logging instrument |
| 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 |
| 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 |
| CN105201496A (en) * | 2015-09-23 | 2015-12-30 | 中国石油大学(北京) | Nuclear magnetic resonance (NMR) logger probe with double layers of magnets and antenna excitation method |
| WO2016108851A1 (en) * | 2014-12-30 | 2016-07-07 | Halliburton Energy Services, Inc. | Combined nmr-resistivity measurement apparatus, systems, and methods |
-
2018
- 2018-09-05 CN CN201811030439.3A patent/CN109236283A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101860A (en) * | 1985-04-01 | 1987-01-10 | N·V·菲利浦光灯制造公司 | Nuclear magnetic resonance analyser |
| 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 |
| CN2823554Y (en) * | 2005-07-07 | 2006-10-04 | 中国石化集团胜利石油管理局测井公司 | Nuclear magnetic resonance logging instrument |
| 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 |
| WO2016108851A1 (en) * | 2014-12-30 | 2016-07-07 | Halliburton Energy Services, Inc. | Combined nmr-resistivity measurement apparatus, systems, and methods |
| 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 |
| CN105201496A (en) * | 2015-09-23 | 2015-12-30 | 中国石油大学(北京) | Nuclear magnetic resonance (NMR) logger probe with double layers of magnets and antenna excitation method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030809A (en) * | 2021-02-27 | 2021-06-25 | 浙江大学 | Vertical aperture nuclear magnetic resonance tester |
| CN113216948A (en) * | 2021-05-19 | 2021-08-06 | 中国石油大学(北京) | Multi-coil-structure while-drilling nuclear magnetic resonance logging device and method |
| CN114089232A (en) * | 2021-11-25 | 2022-02-25 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
| CN114089232B (en) * | 2021-11-25 | 2022-08-09 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
| CN115234219A (en) * | 2022-08-16 | 2022-10-25 | 中国海洋石油集团有限公司 | Nuclear magnetic resonance probe and downhole operation tool |
| CN115234219B (en) * | 2022-08-16 | 2024-08-16 | 中国海洋石油集团有限公司 | Nuclear magnetic resonance probe and downhole operation tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7733086B2 (en) | Systems and methods for deep-looking NMR logging | |
| RU2652046C2 (en) | Downhole nuclear magnetic resonance (nmr) tool with transversal-dipole antenna configuration | |
| AU2016226554B2 (en) | Nuclear magnetic resonance apparatus, systems, and methods | |
| US8373412B2 (en) | NMR-LWD imaging tool | |
| US6018243A (en) | NMR well logging apparatus and method | |
| CN109236283A (en) | NMR logging instrument probe and NMR logging instrument | |
| JP2517720B2 (en) | Nuclear magnetic resonance detector and its technology | |
| US6586931B2 (en) | NMR logging in the earth's magnetic field | |
| US6459262B1 (en) | Toroidal receiver for NMR MWD | |
| WO2002010799A1 (en) | Side-looking nmr probe for oil well logging | |
| NO323986B1 (en) | Apparatus and method for acquiring a nuclear magnetic resonance paint during drilling | |
| US8324895B2 (en) | MWD/LWD NMR imaging with long echo trains | |
| GB2324375A (en) | Longitudinal NMR well logging apparatus and method | |
| RU2318224C2 (en) | Method for azimuth nuclear-magnetic resonance visualization of rock properties from a well hole | |
| RU2367982C1 (en) | Method of logging with application of nuclear-magnetic resonance and device for its realisation | |
| CN110058320A (en) | A kind of adjustable active field nuclear magnetic resonance log probe of detecting area and its detection method | |
| US6525535B2 (en) | NMR apparatus for oil well logging of large and small diameter wells | |
| GB2324376A (en) | Nuclear magnetic resonance well logging | |
| GB2408584A (en) | NMR logging in the earth's magnetic field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190118 |