CN102361171A - Radar well logging antenna of oil field - Google Patents
Radar well logging antenna of oil field Download PDFInfo
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- CN102361171A CN102361171A CN2011103047576A CN201110304757A CN102361171A CN 102361171 A CN102361171 A CN 102361171A CN 2011103047576 A CN2011103047576 A CN 2011103047576A CN 201110304757 A CN201110304757 A CN 201110304757A CN 102361171 A CN102361171 A CN 102361171A
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- ferrite
- dipole antenna
- well logging
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Abstract
The invention relates to a radar well logging antenna of an oil field, comprising a dipole antenna loaded with a resistor, a ferrite and a metal baffle. The ferrite is fixed at one side of the dipole antenna and the metal baffle is fixed at the back side of the ferrite. When the radar well logging is proceeded, main energy is radiated towards one side of the dipole antenna after electromagnetic waves are reflected by the metal baffle, and other energies are converted into other forms of energies in the ferrite and are consumed, so that the directional aim is achieved, the ratio of a main peak of a received signal waveform to the main peak of a trailing signal is more than 10:1, and the amplitude ratio of a forward waveform to a backward waveform is more than 3:1. According to the radar well logging antenna provided by the invention, the positions of mediums including petroleum, water and the like can be determined after signals are processed.
Description
Technical field
The present invention relates to a kind of oil field radar well logging antenna.
Background technology
Antenna directly affects the investigative range and the precision of radar as the core component of boring radar imagery system.The boring radar system generally adopts the ultra wideband narrow-pulse signal, therefore requires antenna should have good shape-retaining ability and directivity.The boring radar antenna mainly is to adopt dipole antenna at present; Improve the tailing problem of pulses of radiation through the mixing of electrode couple sub antenna loading resistor or resistance capacitance; Aspect directivity, normally antenna is done forming V-shape, but obtain certain directivity; But the v antenna volume is bigger, is difficult in extensive use in the well logging.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of good directionality is provided, receives the oil field radar well logging antenna that in boring radar imagery system, uses that the signal waveform hangover is little, volume is little, simple in structure.
The present invention provides a kind of oil field radar well logging time domain directional antenna for solving its technical problem; Described dipole antenna one side is fixed with the ferrite of column; And ferritic two ends are not less than the two ends of dipole antenna; The two ends of ferritic cross section are not less than the two ends of dipole antenna cross section, and ferritic central axis is parallel with the central axis of dipole antenna.
Described ferrite is fixed with metal baffle with respect to the back side and the side of dipole antenna; The ferritic one side of described fixedly dipole antenna be shaped as plane or negative cruvature face; Described ferrite is a cuboid, and the ferrite that is fixed with dipole antenna simultaneously is provided with groove; The length of described dipole antenna is 440mm; The impedance of described antenna is 50 Ω.
The invention has the beneficial effects as follows,, make the waveform hangover that receives less through to fixing ferrite of a side of the dipole antenna of loading resistor and metal baffle; Good directionality, resolution is high, and this antenna structure is simple; Volume is little, is adapted at using in the well of all size.
Description of drawings
Fig. 1 ferrite dual-mode antenna of the present invention front view;
Fig. 2 is the left view of the embodiment of the invention one;
Fig. 3 is the left view of the embodiment of the invention two;
Fig. 4 is the left view of the embodiment of the invention three;
Fig. 5 is the left view of the embodiment of the invention four;
Fig. 6 is the oscillogram of the ferrite antenna forward wave of the embodiment of the invention four;
Fig. 7 is the contrast oscillogram of the ferrite antenna forward wave and the backward wave of the embodiment of the invention four.
Embodiment
Below in conjunction with accompanying drawing the embodiment of invention is done further explanation.
Embodiments of the invention one
This antenna comprises among Fig. 1: dipole antenna 1, loading resistor 2 and ferrite 3, wherein be loaded with loading resistor 2 on the dipole antenna 1, and dipole antenna 1 is fixed on the face of ferrite 3, the equal in length of the length of ferrite 3 and dipole antenna 1.Left view according to present embodiment is as shown in Figure 2, and the one side that is fixed with the ferrite 3 of dipole antenna 1 is a parabolic shape, and dipole antenna 1 is positioned at ferrite 3 paraboloidal centers, and the parallel axes of the axis of dipole antenna 1 and ferrite 3.When electromagnetic wave signal when ferrite 3 materials because the absorbing property of ferrite 3, it can be converted into electromagnetic wave energy the energy (mainly being heat energy) of other form and be consumed; This loss mainly is the mangneto loss and the dielectric loss of ferrite 3; So, when antenna 1 radiated electromagnetic wave, filled the electromagnetic wave that ferrite 3 one side antennas 1 are radiate and absorbed in a large number by ferrite 3; 1 on an other side antenna gives off the electromagnetic wave normal propagation and goes out, thereby reaches directed effect.
Embodiments of the invention two
In conjunction with Fig. 1 and shown in Figure 3; Be loaded with loading resistor 2 on the dipole antenna 1; Ferrite 3 is a cuboid, and dipole antenna 1 is fixed on the plane of ferrite 3, is provided with semicircular groove on this plane; Dipole antenna 1 is fixed in this groove, and the parallel axes of the axis of dipole antenna 1 and ferrite 3.When electromagnetic wave signal when ferrite 3 materials because the absorbing property of ferrite 3, it can be converted into electromagnetic wave energy the energy (mainly being heat energy) of other form and be consumed; This loss mainly is the mangneto loss and the dielectric loss of ferrite 3; So, when antenna 1 radiated electromagnetic wave, filled the electromagnetic wave that ferrite 3 one side antennas 1 are radiate and absorbed in a large number by ferrite 3; 1 on an other side antenna gives off the electromagnetic wave normal propagation and goes out, thereby reaches directed effect.
Embodiments of the invention three
In conjunction with Fig. 1 and shown in Figure 4; This enforcement is the optimization of on the basis of embodiment one, carrying out; Through the back side and side fixing metal baffle plate 4 with respect to dipole antenna 1 at ferrite 3, metal baffle 4 sticks with glue at the ferritic back side, and is wrapped in 3 sidewalls of ferrite 3; The shape of metal baffle 4 is consistent with ferrite 3 shapes, and size is as the criterion with the back side and the side that covers ferrite 3.When electromagnetic wave signal when ferrite 3 materials because the absorbing property of ferrite 3, it can be converted into electromagnetic wave energy the energy (mainly being heat energy) of other form and be consumed; This loss mainly is the mangneto loss and the dielectric loss of ferrite 3; So, when antenna 1 radiated electromagnetic wave, filled the electromagnetic wave that ferrite 3 one side antennas 1 are radiate and absorbed in a large number by ferrite 3; 1 on an other side antenna gives off the electromagnetic wave normal propagation and goes out, thereby reaches directed purpose.Be added in the metal baffle 4 of ferrite 3 back sides and side, can reflection electromagnetic wave, make directional effect better.
Embodiments of the invention four
In conjunction with Fig. 1 and shown in Figure 5, this enforcement is the optimization of on the basis of embodiment two, carrying out, and dipole antenna 1 is fixed on the plane of ferrite 3 of rectangular shape; Be provided with semicircular groove on this plane; Dipole antenna 1 is fixed in this groove, and the parallel axes of the axis of dipole antenna 1 and ferrite 3, is fixed with metal baffle 4 at the ferritic back side and side; Metal baffle 4 is rectangular, and size is as the criterion to cover the ferritic back side and side.When electromagnetic wave signal when ferrite 3 materials because the absorbing property of ferrite 3, it can be converted into electromagnetic wave energy the energy (mainly being heat energy) of other form and be consumed; This loss mainly is the mangneto loss and the dielectric loss of ferrite 3; So, when antenna 1 radiated electromagnetic wave, filled the electromagnetic wave that ferrite 3 one side antennas 1 are radiate and absorbed in a large number by ferrite 3; 1 on an other side antenna gives off the electromagnetic wave normal propagation and goes out, thereby reaches directed purpose.Be added in the metal baffle 4 of ferrite 3 back sides and side, can reflection electromagnetic wave, make directional effect better.Analyze in the face of the directional properties of this antenna in the lime stone environment down.
In order to be beneficial to and clock and receiver coupling, the impedance of antenna is chosen as 50 Ω.Its centre frequency of length decision of dipole antenna 1, the long more centre frequency of length is low more, reserves but waveform differs, so through optimized choice length 440mm.Clock gives off the pulse of 3ns, carries out spectrum analysis through the output waveform in paired pulses source, and obtaining its centre frequency is 115MHz.Take all factors into consideration the length and the waveform of antenna, the central task Frequency Design of antenna is 130MHz, and antenna not only can be gone out most of energy emission of clock and can keep waveform preferably.Fig. 6 and Fig. 7 are that we utilize the ferrite directional antenna in the lime stone environment, to carry out directed resulting antenna oscillogram.Fig. 6 is the oscillogram of the received forward wave of reception antenna, therefrom can find out, the main peak of forward wave waveform is 16.5 with hangover ratio; Fig. 7 is the oscillogram of received forward wave of reception antenna and backward wave contrast, and as can be seen from the figure, the peak-to-peak value of forward wave and backward wave ratio is 3.2, and promptly the ratio of front and back wave-shape amplitude is greater than 10dB.The value that these two values all can reach greater than present antenna, this ferrite directional antenna can be good at satisfying in the oil well to be used.
Claims (6)
1. oil field radar well logging antenna; The dipole antenna that comprises loading resistor; It is characterized in that: described dipole antenna one side is fixed with the ferrite of column; And ferritic two ends are not less than the two ends of dipole antenna, and the two ends of ferritic cross section are not less than the two ends of dipole antenna cross section, and ferritic central axis is parallel with the central axis of dipole antenna.
2. antenna according to claim 1 is characterized in that: described ferrite is fixed with metal baffle with respect to the back side and the side of dipole antenna.
3. antenna according to claim 1 and 2 is characterized in that: the ferritic one side of described fixedly dipole antenna be shaped as plane or negative cruvature face.
4. antenna according to claim 3 is characterized in that: described ferrite is a cuboid, and the ferrite that is fixed with dipole antenna simultaneously is provided with groove.
5. antenna according to claim 4 is characterized in that: the length of described dipole antenna is 440mm.
6. according to claim 4 or 5 described antennas, it is characterized in that: the impedance of described antenna is 50 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103047576A CN102361171A (en) | 2011-10-10 | 2011-10-10 | Radar well logging antenna of oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103047576A CN102361171A (en) | 2011-10-10 | 2011-10-10 | Radar well logging antenna of oil field |
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| Publication Number | Publication Date |
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| CN102361171A true CN102361171A (en) | 2012-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103047576A Pending CN102361171A (en) | 2011-10-10 | 2011-10-10 | Radar well logging antenna of oil field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994161A (en) * | 2019-12-31 | 2020-04-10 | 电子科技大学 | Asymmetric broadband dipole antenna for borehole radar |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960032799A (en) * | 1995-02-04 | 1996-09-17 | 이돈신 | Radio Radiation Classic Rear-facing Directional Antenna |
| CN1697257A (en) * | 2005-06-15 | 2005-11-16 | 东南大学 | Delay line loaded impulse antenna |
| CN101055781A (en) * | 2006-03-14 | 2007-10-17 | Nec东金株式会社 | Ferrite material, ferrite film formed thereof, and radio frequency identification tag with ferrite film |
| US7692598B1 (en) * | 2005-10-26 | 2010-04-06 | Niitek, Inc. | Method and apparatus for transmitting and receiving time-domain radar signals |
| CN202308324U (en) * | 2011-10-10 | 2012-07-04 | 中国石油化工股份有限公司 | Oil field radar logging antenna |
-
2011
- 2011-10-10 CN CN2011103047576A patent/CN102361171A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960032799A (en) * | 1995-02-04 | 1996-09-17 | 이돈신 | Radio Radiation Classic Rear-facing Directional Antenna |
| CN1697257A (en) * | 2005-06-15 | 2005-11-16 | 东南大学 | Delay line loaded impulse antenna |
| US7692598B1 (en) * | 2005-10-26 | 2010-04-06 | Niitek, Inc. | Method and apparatus for transmitting and receiving time-domain radar signals |
| CN101055781A (en) * | 2006-03-14 | 2007-10-17 | Nec东金株式会社 | Ferrite material, ferrite film formed thereof, and radio frequency identification tag with ferrite film |
| CN202308324U (en) * | 2011-10-10 | 2012-07-04 | 中国石油化工股份有限公司 | Oil field radar logging antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994161A (en) * | 2019-12-31 | 2020-04-10 | 电子科技大学 | Asymmetric broadband dipole antenna for borehole radar |
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Application publication date: 20120222 |