CN101098047A - Nuclear magnetic resonance logging instrument probe antenna - Google Patents
Nuclear magnetic resonance logging instrument probe antenna Download PDFInfo
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- CN101098047A CN101098047A CNA2006100905979A CN200610090597A CN101098047A CN 101098047 A CN101098047 A CN 101098047A CN A2006100905979 A CNA2006100905979 A CN A2006100905979A CN 200610090597 A CN200610090597 A CN 200610090597A CN 101098047 A CN101098047 A CN 101098047A
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Abstract
A nuclear magnetic resonance well logging machine probe antenna used at the probe of nuclear magnetic resonance well logging machine, comprises magnetic steel (24), a main antenna copper skin (25), a beam (26), and a main antenna copper skin open portion (27). The invention is characterized in that the main antenna (25)comprises a copper skin coiled on the soft magnetic steel (24)to be adhered integrally via strong adhesive, the widths of the main antenna copper skin (25)and the main antenna copper skin beam (26)are 2.54cm, the width of the main antenna copper skin open portion (27)is 1mm, to avoid the effect of slurry mineralization rate in well. The single beam of the main antenna and the single-ring copper skin of the auxiliary antenna can reduce the demand on emission power, which are contacted with well wall to improve the signal-noise ratio of device, to improve the amplitude of received echo signal, reduce interference, reduce antenna length, and improve longitudinal resolution of well logging. The invention uses main and auxiliary antennas to realize ground layer porosity measurement and multi-dimension nuclear magnetic resonance well logging imaging technical, and improve well logging speed.
Description
Technical field:
The invention belongs to oil well logging instrument equipment, relate generally to the nuclear magnetic resonance logging instrument probe antenna of NMR logging instrument probe part, be used for nmr echo signal, be matched in NMR logging instrument and survey the stratum physical message to stratum emission radio-frequency pulse and the generation of reception stratum.
Background technology:
Nuclear magnetic resonance logging instrument probe antenna produces radio-frequency pulse in the stratum, the hydrogen atom in the stratum is carried out the polarization of B1 direction.The echo-signal that hydrogen atom in the stratum after the polarization is produced is measured simultaneously.
The antenna of NMR logging instrument employing at present mainly contains following two types: the annular copper sheet antenna of U.S. Halliburton Company, and inner in soft magnetic core.Be used for the measurement of type nuclear logging instrument placed in the middle, the transmitting power of circuit required big, be subjected to that mud salinity influences greatly in the well.The approximate echelon antenna of Schlumberger Ltd., the opening angle of antenna soft magnetic core is 135 °, and the main antenna copper sheet is wrapped on the soft magnetic core, and crossbeam is parallel two.Auxiliary antenna is for twining two ring copper sheets on the soft magnetic core.Because its opening angle is big, so the well mud salinity is influential to the signal echo amplitude of transmitted pulse and reception, the interference of signal is bigger.The transmitting power that this main and auxiliary antenna needs is big, to the requirement height of circuit, increases the cost of manufacture of circuit.
More than the signal of two kinds of antennas all be subjected to the influence of mud salinity in the well, and the transmitting power of circuit is required high, increased the cost of manufacture and the design difficulty of circuit.
Summary of the invention:
The object of the present invention is to provide a kind of antenna of NMR logging instrument probe, adopt the borehole wall mode of pasting, be divided into main and auxiliary two kinds of antennas, the opening angle of antenna soft magnetic core is moderate, the echo-signal of transmitted pulse and reception is not subjected to the influence of mud in the well, and transmitting power is moderate to the power requirement of circuit.
The present invention is such realization:
The antenna soft magnetic core adopts the FERRITE CORE of high saturation magnetic flux, is shaped as fan-shapedly, and opening angle adopts 90 °, and fan-shaped arc surface points to the stratum.The crossbeam of main antenna is one, and auxiliary antenna adopts the individual pen copper sheet.Main and auxiliary antenna can be launched B1 magnetic field and receive the echo-signal on stratum in pasting stratum, borehole wall fan section.
The present invention has the following advantages and effect: simple in structure, investigation depth is big.90 ° of the opening angles of main and auxiliary antenna have been exempted the influence of mud salinity in the well.The single crossbeam of main antenna and the monocycle copper sheet of auxiliary antenna have reduced the requirement to transmitting power, and the cost of manufacture of circuit is low, and circuit design is easy to realize.Paste the borehole wall and improved the signal to noise ratio of instrument, make the echo signal amplitude of reception big, disturb for a short time, antenna length is little, has improved the well logging longitudinal frame.Adopt main and auxiliary antenna to solve the realization of formation porosity measurement and multi-dimensional nmr well logging imaging technique effectively, can improve logging speed greatly.
Description of drawings:
Fig. 1 is the soft magnetic ferrite magnet steel vertical view of the main and auxiliary antenna of NMR logging instrument probe
Fig. 2 is the soft magnetic ferrite magnet steel structural representation of the main and auxiliary antenna of NMR logging instrument probe
Fig. 3 is the structural representation of NMR logging instrument probe main antenna
Fig. 4 is the structural representation of NMR logging instrument probe auxiliary antenna
Specific embodiments:
As shown in Figure 3, Fig. 3 is the main antenna structural representation, by among the figure as can be known, comprise magnet steel 24, main antenna copper sheet 25, crossbeam 26, the not closed place 27 of main antenna copper sheet, main antenna 25 is to be wrapped on the soft magnetism magnet steel 24 by copper sheet, be bonded as one through irritating seccotine, crossbeam 26 width of main antenna are 2.54cm, and the width at not closed place 27 is 1mm.
As shown in Figure 4, the auxiliary antenna structure as we know from the figure, comprise auxiliary antenna copper sheet 28, the not closed place 29 of auxiliary antenna copper sheet, auxiliary antenna 28 is to be wrapped on the soft magnetism magnet steel 24 by annular copper sheet, be bonded as one through irritating seccotine, the winding width of auxiliary antenna on magnet steel is 25cm, and the width at not closed place 29 is 1mm.
As shown in Figure 2, whole soft magnetism magnet steel 24 is by being numbered 4,5 ... 22,23 20 blocks of little magnet steel or more little magnet steel are formed, and form magnet steel 24 through the high strength glue bond, and the thickness of little magnet steel is 2.5cm.The arc surface of magnet steel 24 points to stratum to be measured.
As shown in Figure 1, the nuclear magnetic resonance logging instrument probe antenna employing is shaped as fan-shaped, and the figure of overlooking of soft magnetic ferrite magnet steel 24 is of a size of shown in the figure.The arc surface of magnet steel 24 is towards stratum to be measured, and the opening angle 1 of magnet steel 24 is 90 °, thereby has exempted the influence of mud salinity in the well.The effect of magnet steel is the amplitude that increases nmr echo signal.
Be fixed on the probe of NMR logging instrument through coiling, the main antenna 25 that is bonded to and auxiliary antenna 28, can in well, paste on the direction of the borehole wall emission radio-frequency pulse and carry out the measurement of nmr echo signal.
Claims (5)
1, a kind of antenna of NMR logging instrument, comprise magnet steel (24), main antenna copper sheet (25), crossbeam (26), the not closed place of main antenna copper sheet (27), it is characterized in that: main antenna (25) is to be wrapped on the soft magnetism magnet steel (24) by copper sheet, be bonded as one through irritating seccotine, main antenna copper sheet (25), the width of main antenna copper sheet crossbeam (26) is 2.54cm, and the width at the not closed place of main antenna copper sheet (27) is 1mm.
2, NMR logging instrument antenna according to claim 1, it is characterized in that: auxiliary antenna comprises auxiliary antenna copper sheet (28), the not closed place of auxiliary antenna copper sheet (29), auxiliary antenna (28) is to be wrapped on the soft magnetism magnet steel (24) by annular copper sheet, be bonded as one through irritating seccotine, the length that auxiliary antenna copper sheet (28) is entangled on the magnet steel (24) is 25cm, the width at the not closed place of auxiliary antenna copper sheet (28) (29) is 1mm, and the remainder of the magnet steel that auxiliary antenna does not encase (24) respectively is 12.5cm.
3, according to claims 1 or 2 described NMR logging instrument antennas, it is characterized in that: magnet steel (24) is that more than one little magnet steel forms through the glue bond of high temperature tension force, main antenna is sticked with glue at magnet steel (24) closely by copper sheet to be formed, and auxiliary antenna is sticked with glue on magnet steel (24) by copper sheet to be formed.
4, according to claims 3 described NMR logging instrument antennas, it is characterized in that: magnet steel (24) is by little magnet steel (4), (5) ... (22), (23) fritter magnet steel bonding forms little magnet steel (4), (5) ... (22), the magnet steel (24) of (23) composition is long is 50cm.
5, according to claims 3 described NMR logging instrument antennas, it is characterized in that: it is characterized in that: the fan-shaped opening angle (1) of magnet steel (24) is 90 °, arc radius (2) is grown for 63.5mm, circular arc opposite straight flange (3) is 43.18mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100905979A CN101098047A (en) | 2006-06-30 | 2006-06-30 | Nuclear magnetic resonance logging instrument probe antenna |
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| CNA2006100905979A CN101098047A (en) | 2006-06-30 | 2006-06-30 | Nuclear magnetic resonance logging instrument probe antenna |
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| CN101098047A true CN101098047A (en) | 2008-01-02 |
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| CNA2006100905979A Pending CN101098047A (en) | 2006-06-30 | 2006-06-30 | Nuclear magnetic resonance logging instrument probe antenna |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444400A (en) * | 2011-11-15 | 2012-05-09 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| CN101343998B (en) * | 2008-09-03 | 2012-05-30 | 中国石油天然气股份有限公司 | High-temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof |
| CN104854479A (en) * | 2013-02-05 | 2015-08-19 | 哈利伯顿能源服务公司 | Apparatus and methods to visualize formation related features |
| CN105114071A (en) * | 2015-09-23 | 2015-12-02 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method |
| 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 |
| CN105221145A (en) * | 2015-09-23 | 2016-01-06 | 中国石油大学(北京) | Multi-faceted NMR (Nuclear Magnetic Resonance) logging instrument and antenna excitation method |
| CN105240000A (en) * | 2015-09-23 | 2016-01-13 | 中国石油大学(北京) | Multi-detection-depth nuclear magnetic resonance logging instrument and probe thereof and antenna excitation method |
| CN105240002A (en) * | 2015-09-23 | 2016-01-13 | 中国石油大学(北京) | Multi-antenna excitation based three-dimensional nuclear magnetic resonance logging instrument |
| CN108138563A (en) * | 2015-10-01 | 2018-06-08 | 斯伦贝谢技术有限公司 | Active damping for nmr logging tools |
| CN109066049A (en) * | 2018-07-18 | 2018-12-21 | 卢氏县地质勘查研究所 | A kind of nuclear magnetic resonance efficient nano ceramics transmitting antenna |
| 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 |
| CN112526620A (en) * | 2020-11-26 | 2021-03-19 | 中国地质大学（北京） | Low signal-to-noise ratio nuclear magnetic resonance echo signal processing method |
-
2006
- 2006-06-30 CN CNA2006100905979A patent/CN101098047A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343998B (en) * | 2008-09-03 | 2012-05-30 | 中国石油天然气股份有限公司 | High-temperature magnet of nuclear magnetic resonance logging instrument and preparation method thereof |
| CN102444400A (en) * | 2011-11-15 | 2012-05-09 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| CN102444400B (en) * | 2011-11-15 | 2015-03-11 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| CN104854479A (en) * | 2013-02-05 | 2015-08-19 | 哈利伯顿能源服务公司 | Apparatus and methods to visualize formation related features |
| CN105240000B (en) * | 2015-09-23 | 2018-04-17 | 中国石油大学(北京) | The NMR logging instrument and its probe of more investigation depths, antenna excitation method |
| US10151852B2 (en) | 2015-09-23 | 2018-12-11 | China University Of Petroleum-Beijing | Multi-azimuth nuclear magnetic resonance logging instrument and antenna excitation method |
| CN105221145A (en) * | 2015-09-23 | 2016-01-06 | 中国石油大学(北京) | Multi-faceted NMR (Nuclear Magnetic Resonance) logging instrument and antenna excitation method |
| CN105240000A (en) * | 2015-09-23 | 2016-01-13 | 中国石油大学(北京) | Multi-detection-depth nuclear magnetic resonance logging instrument and probe thereof and antenna excitation method |
| CN105240002A (en) * | 2015-09-23 | 2016-01-13 | 中国石油大学(北京) | Multi-antenna excitation based three-dimensional nuclear magnetic resonance logging instrument |
| CN105114071B (en) * | 2015-09-23 | 2018-03-09 | 中国石油大学(北京) | NMR logging instrument probe and antenna excitation method with multi-layer magnet |
| CN105114071A (en) * | 2015-09-23 | 2015-12-02 | 中国石油大学(北京) | Nuclear magnetic resonance logging instrument probe with multiple layers of magnets and antenna excitation method |
| US10274634B2 (en) | 2015-09-23 | 2019-04-30 | China University Of Petroleum-Beijing | Nuclear magnetic resonance logging instrument probe with double-layered magnets and antenna excitation method |
| US10151808B2 (en) | 2015-09-23 | 2018-12-11 | China University Of Petroleum-Beijing | Multi-detecting depth nuclear magnetic resonance logging tool and probe, and antenna excitation method |
| 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 |
| US10274633B2 (en) | 2015-09-23 | 2019-04-30 | China University Of Petroleum-Beijing | Three dimensional nuclear magnetic resonance logging instrument based on multiple antenna excitation |
| US10254434B2 (en) | 2015-09-23 | 2019-04-09 | China University Of Petroleum-Beijing | Nuclear magnetic resonance logging instrument probe with multi-layered magnet and antenna excitation method |
| CN108138563A (en) * | 2015-10-01 | 2018-06-08 | 斯伦贝谢技术有限公司 | Active damping for nmr logging tools |
| CN108138563B (en) * | 2015-10-01 | 2021-09-21 | 斯伦贝谢技术有限公司 | Active damping for NMR logging tools |
| CN109066049A (en) * | 2018-07-18 | 2018-12-21 | 卢氏县地质勘查研究所 | A kind of nuclear magnetic resonance efficient nano ceramics transmitting antenna |
| 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 |
| CN112526620A (en) * | 2020-11-26 | 2021-03-19 | 中国地质大学（北京） | Low signal-to-noise ratio nuclear magnetic resonance echo signal processing method |
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Open date: 20080102 |