CN103953337A - Nuclear magnetic resonance logging instrument probe - Google Patents
Nuclear magnetic resonance logging instrument probe Download PDFInfo
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- CN103953337A CN103953337A CN201410209924.2A CN201410209924A CN103953337A CN 103953337 A CN103953337 A CN 103953337A CN 201410209924 A CN201410209924 A CN 201410209924A CN 103953337 A CN103953337 A CN 103953337A
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- permanent magnet
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Abstract
The invention discloses a nuclear magnetic resonance logging instrument probe. The nuclear magnetic resonance logging instrument probe is fixed on a nuclear magnetic resonance logging instrument and comprises a permanent magnet and antennas, wherein the permanent magnet is of a plain-sawed cylinder shaped structure, the antennas are symmetrically arranged on the two sides of a non-arc-shaped part of the permanent magnet, and a magnet piece used for extending a magnetic pole is fixed on the arc-shaped edge of the permanent magnet. The nuclear magnetic resonance logging instrument probe can log in a multidimensional mode around a borehole, and the detecting depth of the ground layer corresponding to the arc-shaped edge is effectively increased.
Description
Technical field
The invention belongs to oil well logging device field, relate generally to logging instrument probe, particularly relate to a kind of NMR logging instrument probe.
Background technology
Nuclear magnetic resonance log utilizes proton in the liquid (oil, water) that is rich in hydrogen atom in formation pore and gas (natural gas) to be subject to exciting the NMR signal of rear generation, by well log interpretation, can be used for quantitatively determining the parameters such as effecive porosity, free fluid porosity, irreducible water degree of porosity, pore-size distribution, permeability and former oil viscosity and wettability.
The probe designs of nuclear magnetic resonance log is at present mainly based on " Inside-out " thought, the CMR wall-attaching type scheme of Schlumberger company, the material improvement of the MAIL series probe of Numar company and the structure optimization of probe, and the bias of MRX and MREx series probe.Its difference is: " Inside-out " at least adopts two parts permanent magnet, respectively two permanent magnets are axially oppositely magnetized, obtain best annular search coverage by the adjustment of the permanent magnet spacing to axial placement, permanent magnet is for generation of the magnetostatic field B of nuclear magnetic resonance
0, between two cylindricality permanent magnets, place for generation of RF magnetic field B
1antenna, antenna package vinculum circle and magnetic core, coil is generally the improvement of solenoid structure, magnetic core be soft magnetic materials its to select more be soft magnetic ferrite or magnet steel, so just at a magnetostatic field B of wellbore formation
0with RF magnetic field B
1strict orthogonal, and B
0size is near-ring shape search coverage evenly.At the stratum of different depth, B
0vary in size, form gradient magnetic, can obtain the annular search coverage on different depth stratum by changing radiofrequency signal.Due to the limited length of instrument, the search coverage of this scheme is less, and logging speed is also slower.CMR wall-attaching type probe adopts three rectangular permanent magnet radial magnetizings, and three parallel homopolarities of permanent magnet are placed, and only lay antenna in a side of permanent magnet pole, produce RF magnetic field so only face antenna side in stratum, form nearly cylindrical search coverage.CMR probe only produces uniform magnetostatic field in a zonule of a direction, and search coverage is little, can only carry out single-frequency measurement.MAIL series probe adopts cylindrical structure permanent magnet radial magnetizing to lay antenna at cylindrical outer surface place, realizes B at radial section
0with B
1strict orthogonal.In the antenna of MRIL probe, do not place magnetic core, the stability of RF magnetic field is bad, and radio-frequency power is high.
Summary of the invention
Goal of the invention:
The present invention relates to a kind of NMR logging instrument probe, its object is, by the probe structure design of magnet and the position of sound production of radio-frequency coil, can produce gradient fields in down-hole, obtains far and near different search coverage.
Technical scheme:
A kind of NMR logging instrument probe, is fixed in NMR (Nuclear Magnetic Resonance) logging instrument, it is characterized in that: comprise permanent magnet and antenna; Permanent magnet is flat-cut column structure, and antenna symmetry is arranged on the both sides of the non-circular arc portion of permanent magnet, is fixed with the magnetic sheet for extending magnetic pole at the arc-shaped edges of permanent magnet.
Permanent magnet is formed by the magnetic post bonding of 10-20 piece flat-cut column structure, and the total length after bonding is 200cm, and magnetic post adopts sintered NdFeB or samarium-cobalt material to make, and the cross section of magnetic post is the mid portion of two symmetrical strings of circle, and cross section forms symmetrical arc; Lay in the outside of magnetic post circular arc with it with high cylinder hull shape magnetic sheet monomer, be close to permanent magnet magnetic post arc-shaped edges and place, magnetic sheet monomer thickness is 10mm, and magnetic sheet entirety is formed by 10-20 piece magnetic sheet monomer bonding, and the quantity of quantity and magnetic post is consistent.
The cross section of magnetic post is that a radius is 60-70mm circle, and the string spacing of two symmetrical strings is 90-100mm.
The flat-cut limit that antenna is close to permanent magnet arranges, and comprises magnetic core and radio-frequency coil, and magnetic core is close to permanent magnet, and radio-frequency coil is around the home on magnetic core; Magnetic core adopts soft magnetic ferrite, and stacked forming piecewise.
Magnetic core is close to two side planes of permanent magnet and is placed between two parties, stacked the forming of 40-50 piece magnetic core lamination that magnetic core is 60mm × 20mm by sectional dimension, and its overall length is identical with permanent magnet.
Advantage and effect:
This NMR logging instrument probe of the present invention, has the following advantages and beneficial effect:
(1) adopt center on Page well logging, the sintered NdFeB that employing magnetic energy product is higher or samarium-cobalt material, as the material of permanent magnet, are fixed with the magnetic sheet for extending magnetic pole effect at the arc-shaped edges of permanent magnet;
(2) antenna makes full use of the remaining space generation RF magnetic field of magnet, the eddy-current loss that the lamination of antenna magnetic core produces for reducing RF magnetic field;
(3) probe produces gradient magnetic in the stratum of wellbore, realizes the multidimensional well logging to wellbore stratum different depth, increase magnet arc-shaped edges the investigation depth on corresponding stratum.
brief description of the drawings:
Fig. 1 is the present invention's type NMR logging instrument probe placed in the middle front view, is half sectional view;
Fig. 2 is the present invention's type NMR logging instrument probe placed in the middle structure top view;
Fig. 3 is the present invention's type NMR (Nuclear Magnetic Resonance) logging instrument placed in the middle antenna magnetic core partial view;
Fig. 4 improves the radial section half sectional view of popping one's head in after antenna structure.
Description of reference numerals:
1, magnetic post; 2, magnetic core; 3, radio-frequency coil; 4, magnetic sheet monomer; 5, magnetic core lamination; 2-1, the first magnetic core; 2-2, the second magnetic core; 2-3, the 3rd magnetic core.
detailed description of the invention:
Below in conjunction with the drawings and specific embodiments, the present invention is described further:
The present invention relates to a kind of NMR logging instrument probe, permanent magnet adopts sintered neodymium iron boron material or samarium-cobalt material, magnet is flat-cut column structure, along two circular arc opposite side radial magnetizings, search coverage corresponding two arc-shaped edges can be pushed away far, increase the party's investigation depth upwards, can realize measurement placed in the middle.Antenna is close to the flat-cut limit placement of permanent magnet, and its magnetic core is close to permanent magnet placement, coiling saddle coil on magnetic core.Magnetic core adopts soft magnetic ferrite, and stacked forming piecewise.Place fan-shaped shelly magnet at permanent magnet pole arc-shaped edges, adopt magnetic steel material or amorphous magnetic material.
NMR logging instrument probe of the present invention, is fixed in NMR (Nuclear Magnetic Resonance) logging instrument, comprises permanent magnet and antenna; Permanent magnet is flat-cut column structure, and antenna symmetry is arranged on the both sides of the non-circular arc portion of permanent magnet, is fixed with the magnetic sheet for extending magnetic pole at the arc-shaped edges of permanent magnet.
Permanent magnet is formed by magnetic post 1 bonding of 10-20 piece flat-cut column structure, and the total length after bonding is 200cm, and magnetic post 1 adopts sintered NdFeB or samarium-cobalt material to make, and the cross section of magnetic post 1 is the mid portion of two symmetrical strings of circle, and cross section forms symmetrical arc; Lay in the outside of magnetic post 1 circular arc with it with high cylinder hull shape magnetic sheet monomer 4, being close to permanent magnet magnetic post arc-shaped edges places, magnetic sheet monomer thickness is 10mm, magnetic sheet entirety is formed by 10-20 piece magnetic sheet monomer bonding, quantity be consistent with the quantity of magnetic post the main magnet of magnetostatic field (produce the consistent stacked bonding of magnetic sheet monomer forms by 10-20 piece magnetic post with its quantity); Magnetic sheet monomer adopts magnetic steel material or amorphous magnetic material.
The cross section of magnetic post 1 is the part in the middle of symmetrical string, and circular radius is 60-70mm, and the string spacing of two symmetrical strings is 90-100mm, and two circular arc opposite side are respectively the N utmost point and the S utmost point.
The flat-cut limit that antenna is close to permanent magnet arranges, and comprises magnetic core 2 and radio-frequency coil 3, and magnetic core 2 is close to permanent magnet, and radio-frequency coil 3 is on magnetic core 2 (radio-frequency coil 3 around the home on the wire wrap adapting with its shape and be fixed on magnetic core 2) around the home; Magnetic core 2 adopts soft magnetic ferrite, and stacked forming piecewise.
Antenna is close to magnet and is placed between two parties, and two side planes that magnetic core 2 is close to permanent magnet are placed between two parties, 40-50 piece magnetic core lamination 5 stacked the forming that the long 200cm of magnetic core 2 is 60mm × 20mm by sectional dimension, and its overall length is identical with permanent magnet.
The present invention can log well in wellbore multidimensional.Increased arc-shaped edges the investigation depth on corresponding stratum.
embodiment 1:
As shown in Figure 1, center type permanent magnet of nuclear magnetic resonance logging instrument probe adopts 10, and sectional dimension is identical, volume equal, along circular arc, the magnetic post bonding of edge direction radial magnetizing is formed, total length is 200cm, magnetic post adopts sintered neodymium iron boron material to make, the cross section of magnetic post is the mid portion of two symmetrical strings of circle, and cross section forms symmetrical arc.The external surface of magnetic post forms symmetrical curved surface and plane, and along magnetizing with parallel plane direction, two curved surface directions of magnetic post are respectively the N utmost point and the S utmost point, form fan-shaped gradient magnetic in wellbore, and increase arc the investigation depth on corresponding stratum.The diameter of magnetic post is 140mm, and the distance between two strings is 100mm, sees Fig. 2.
As shown in Figure 1, the antenna of type NMR logging instrument probe placed in the middle is made up of magnetic core 2 and radio-frequency coil 3, and magnetic core is formed by 40 stacked bondings of magnetic core lamination 5, sees Fig. 3.Its objective is the eddy-current loss producing in order to reduce radio-frequency current, radio-frequency coil is wound on coil housing.
As shown in Figure 1, magnetic sheet is posted at the permanent magnet arc magnetic pole two ends of type NMR logging instrument probe placed in the middle, magnetic sheet is to be formed by identical 10 magnetic sheet monomers, 4 bondings of specification, and then with permanent magnet magnetic post bonding, its effect is the magnetic field that produces in stratum of even permanent magnet and search coverage is pushed away far.
embodiment 2:
Substantially the same manner as Example 1, difference is that antenna is gradient antenna, and one end size of pressing close to permanent magnet is larger, less away from one end size of permanent magnet, sees Fig. 4.The radial dimension of magnetic core that the present embodiment adopts is: the first magnetic core 2-1 is 80mm × 8mm, and the second magnetic core 2-2 is 70mm × 8mm, and the 3rd magnetic core 2-3 is 60mm × 5mm, at axial mode lamination as shown in Figure 3 still.
Claims (5)
1. a NMR logging instrument probe, is fixed in NMR (Nuclear Magnetic Resonance) logging instrument, it is characterized in that: comprise permanent magnet and antenna; Permanent magnet is flat-cut column structure, and antenna symmetry is arranged on the both sides of the non-circular arc portion of permanent magnet, is fixed with the magnetic sheet for extending magnetic pole at the arc-shaped edges of permanent magnet.
2. NMR (Nuclear Magnetic Resonance) logging instrument according to claim 1, it is characterized in that: permanent magnet is formed by magnetic post (1) bonding of 10-20 piece flat-cut column structure, total length after bonding is 200cm, magnetic post (1) adopts sintered NdFeB or samarium-cobalt material to make, the cross section of magnetic post (1) is the mid portion of two symmetrical strings of circle, and cross section forms symmetrical arc; Lay with it with high cylinder hull shape magnetic sheet monomer (4) in the outside of magnetic post (1) circular arc, being close to permanent magnet magnetic post arc-shaped edges places, magnetic sheet monomer thickness is 10mm, and magnetic sheet entirety is formed by 10-20 piece magnetic sheet monomer bonding, and the quantity of quantity and magnetic post is consistent.
3. NMR (Nuclear Magnetic Resonance) logging instrument according to claim 2, is characterized in that: the cross section of magnetic post (1) is that a radius is 60-70mm circle, and the string spacing of two symmetrical strings is 90-100mm.
4. NMR (Nuclear Magnetic Resonance) logging instrument according to claim 1, is characterized in that: the flat-cut limit that antenna is close to permanent magnet arranges, and comprises magnetic core (2) and radio-frequency coil (3), and magnetic core (2) is close to permanent magnet, and radio-frequency coil (3) is around the home on magnetic core (2); Magnetic core (2) adopts soft magnetic ferrite, and stacked forming piecewise.
5. NMR (Nuclear Magnetic Resonance) logging instrument according to claim 4, it is characterized in that: magnetic core (2) is close to two side planes of permanent magnet and is placed between two parties, stacked the forming of 40-50 piece magnetic core lamination (5) that magnetic core (2) is 60mm × 20mm by sectional dimension, its overall length is identical with permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410209924.2A CN103953337B (en) | 2014-05-19 | 2014-05-19 | A kind of NMR logging instrument probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410209924.2A CN103953337B (en) | 2014-05-19 | 2014-05-19 | A kind of NMR logging instrument probe |
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| CN103953337A true CN103953337A (en) | 2014-07-30 |
| CN103953337B CN103953337B (en) | 2017-08-11 |
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| CN201410209924.2A Expired - Fee Related CN103953337B (en) | 2014-05-19 | 2014-05-19 | A kind of NMR logging instrument probe |
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Cited By (6)
| 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 |
| CN108802836A (en) * | 2018-05-28 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of nuclear magnetic resonance device and its logging |
| CN111472766A (en) * | 2020-05-06 | 2020-07-31 | 中国石油天然气集团有限公司 | Magnet of downhole nuclear magnetic resonance logging instrument |
| CN111810134A (en) * | 2019-12-26 | 2020-10-23 | 北京默凯斯威能源技术有限公司 | Petroleum nuclear magnetic resonance logging instrument probe magnet device |
| CN111827995A (en) * | 2020-07-31 | 2020-10-27 | 中国石油天然气集团有限公司 | Method for calculating permeability of overpressure conglomerate reservoir based on nuclear magnetic resonance |
| CN113161101A (en) * | 2020-01-20 | 2021-07-23 | 中国石油天然气股份有限公司 | Permanent magnet for nuclear magnetic resonance logging instrument |
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| 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 |
| CN201546719U (en) * | 2009-11-11 | 2010-08-11 | 中国海洋石油总公司 | Focusing nuclear magnetic resonance eccentric well-logging probe |
| CN203867568U (en) * | 2014-05-19 | 2014-10-08 | 沈阳工业大学 | Nuclear magnetic resonance well logger probe |
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| CN2192615Y (en) * | 1994-05-24 | 1995-03-22 | 苗世玉 | Magnetic water apparatus |
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Cited By (8)
| 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 |
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| CN108802836A (en) * | 2018-05-28 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of nuclear magnetic resonance device and its logging |
| CN111810134A (en) * | 2019-12-26 | 2020-10-23 | 北京默凯斯威能源技术有限公司 | Petroleum nuclear magnetic resonance logging instrument probe magnet device |
| CN111810134B (en) * | 2019-12-26 | 2024-03-26 | 北京默凯斯威能源技术有限公司 | Probe magnet device of petroleum nuclear magnetic resonance logging instrument |
| CN113161101A (en) * | 2020-01-20 | 2021-07-23 | 中国石油天然气股份有限公司 | Permanent magnet for nuclear magnetic resonance logging instrument |
| CN111472766A (en) * | 2020-05-06 | 2020-07-31 | 中国石油天然气集团有限公司 | Magnet of downhole nuclear magnetic resonance logging instrument |
| CN111827995A (en) * | 2020-07-31 | 2020-10-27 | 中国石油天然气集团有限公司 | Method for calculating permeability of overpressure conglomerate reservoir based on nuclear magnetic resonance |
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| CN103953337B (en) | 2017-08-11 |
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