CN117724090A - Drilling radar system for directional detection - Google Patents
Drilling radar system for directional detection Download PDFInfo
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- CN117724090A CN117724090A CN202311523873.6A CN202311523873A CN117724090A CN 117724090 A CN117724090 A CN 117724090A CN 202311523873 A CN202311523873 A CN 202311523873A CN 117724090 A CN117724090 A CN 117724090A
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
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Abstract
The invention discloses a drilling radar system for directional detection, which comprises a transmitting antenna and a receiving antenna which are sequentially arranged along a drilling direction, wherein the transmitting antenna can radiate signals to a geological body around the drilling, the receiving antenna is used for receiving signals reflected by geological abnormal bodies around the drilling, the receiving antenna comprises a plurality of first dipole antenna units which are arranged along the inner circumference, the first dipole antenna units comprise a first metal arm and a second metal arm which are sequentially arranged along the drilling direction, the first metal arm comprises a first upper metal arm and a first lower metal arm which are arranged at intervals along the drilling direction, a first loading resistor is arranged between the first upper metal arm and the first lower metal arm for electric connection, the second metal arm comprises a second upper metal arm and a second lower metal arm which are arranged at intervals along the drilling direction, and a second loading resistor is arranged between the second upper metal arm and the second lower metal arm for electric connection.
Description
Technical Field
The invention is used in the field of borehole radar detection, and particularly relates to a borehole radar system for directional detection.
Background
The drilling radar is an important means for geophysical exploration, and is widely applied to detection of karst cave, stratum fracture zone, underground pipeline, petroleum and mineral distribution and the like around a drilling hole, wherein the drilling radar antenna is an important component for transmitting and receiving signals of a drilling radar system for directional detection, the performance of the drilling radar antenna plays an important role in the drilling radar system for directional detection, but is limited by the size of the drilling hole in practical application, an omnidirectional dipole antenna for radiating electromagnetic waves to 360 DEG is often selected as a transmitting antenna and a receiving antenna of the drilling radar, so that the conventional single-hole reflection radar can obtain depth, size, distance and other information of an underground target, but cannot obtain azimuth of the underground target, and in order to obtain azimuth information of the target, a plurality of drilling holes are required to be measured in a crossing mode or the directional radar antenna with a reflecting plate is used for 360 DEG mechanical rotation, and the methods can lead to significant increase of detection and construction cost and difficulty and low directional accuracy.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a drilling radar system for directional detection, which can judge the specific azimuth of geological anomalies around a drilling hole and realize a directional function.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a drilling radar system for directional detection, includes transmitting antenna and receiving antenna that sets gradually along the drilling direction, transmitting antenna can be to the geological body around the drilling radiation signal, receiving antenna is used for receiving the geological body reflection around the drilling signal, receiving antenna includes a plurality of first dipole antenna units that set up along the inner circumference, first dipole antenna unit includes first metal arm and the second metal arm that set gradually along the drilling direction, first metal arm includes first upper metal arm and the first metal arm that set up along the drilling direction interval, first upper metal arm with be equipped with first loading resistor between the first metal arm and carry out the electricity and be connected, second metal arm includes second upper metal arm and the second metal arm that set up along the drilling direction interval down, second upper metal arm with be equipped with second loading resistor between the second metal arm and carry out the electricity and be connected.
Preferably, the transmitting antenna comprises a second dipole antenna unit, the second dipole antenna unit comprises a third metal arm and a fourth metal arm which are sequentially arranged along the drilling direction, the third metal arm comprises a third upper metal arm and a third lower metal arm which are arranged along the drilling direction at intervals, a third loading resistor is arranged between the third upper metal arm and the third lower metal arm for electric connection, the fourth metal arm comprises a fourth upper metal arm and a fourth lower metal arm which are arranged along the drilling direction at intervals, and a fourth loading resistor is arranged between the fourth upper metal arm and the fourth lower metal arm for electric connection.
Preferably, the coaxial cable comprises a coaxial cable extending along the drilling direction, a first power supply device is connected between the first metal arm and the second metal arm, a second power supply device is connected between the third metal arm and the fourth metal arm, the coaxial cable is connected with the first power supply device and the second power supply device, a radar host is arranged on the ground outside the drilling hole, the top end of the coaxial cable is connected with the radar host, and a computer for processing signals is connected to the radar host.
Preferably, the receiving antenna comprises a first shell, a plurality of first dipole antenna units are arranged around the inner periphery of the first shell, a first fixing material pipe is arranged in the first shell, the first fixing material pipe is located at the inner periphery of the plurality of first dipole antenna units, a first channel is arranged in the first fixing material pipe along the drilling direction, the transmitting antenna comprises a second shell, a third metal arm and a fourth metal arm are arranged in the second shell, a second channel is arranged in the third metal arm and the fourth metal arm along the drilling direction, and a coaxial cable penetrates through the first channel to be connected with the first feeding device and penetrates through the second channel to be connected with the second feeding device.
Preferably, the inner periphery of the second shell is provided with a second fixed material pipe, the third metal arm and the fourth metal arm are both positioned between the second fixed material pipe and the second shell, the second channel is arranged at the axis position of the second fixed material pipe, and the second fixed material pipe is provided with a groove for placing the coaxial cable.
Preferably, the lower end of the first lower metal arm is conical from top to bottom, the upper end of the second upper metal arm is conical from bottom to top, the lower end of the third lower metal arm is conical from top to bottom, and the upper end of the fourth upper metal arm is conical from bottom to top.
Preferably, the first loading resistor, the second loading resistor, the third loading resistor and the fourth loading resistor have resistance values ranging from 10Ω to 350Ω, and the outer surface of the coaxial cable is provided with scales along the drilling direction.
Preferably, the first loading resistor is located at a middle position of the first metal arm, the second loading resistor is located at a middle position of the second metal arm, the third loading resistor is located at a middle position of the third metal arm, and the fourth loading resistor is located at a middle position of the fourth metal arm.
Preferably, a casing is arranged in the borehole, the transmitting antenna and the receiving antenna are both positioned in the casing, the transmitting antenna is an omni-directional dipole transmitting antenna in the well, and the receiving antenna is an array receiving antenna in the well.
Preferably, the number of the first dipole antenna units is 6, the 6 first dipole antenna units are sequentially distributed at intervals of 60 degrees along the circumferential direction of the sleeve, and the diameter of each first dipole antenna unit is smaller than one fifth of the diameter of the sleeve.
One of the above technical solutions has at least one of the following advantages or beneficial effects: the transmitting antenna for the directional detection is used for drilling the geological body around the hole for 360-degree radiation electromagnetic waves, the receiving antenna is used for receiving electromagnetic waves reflected by geological abnormal bodies around the hole, and processing reflected electromagnetic wave signals from a target object which are received by a plurality of first dipole antenna units in the receiving antenna at the same time, so that the specific azimuth of the geological abnormal bodies around the hole can be judged with high precision, the directional function is realized, wherein the arrangement of the first loading resistor and the second loading resistor remarkably improves the impedance matching of the antenna, the working bandwidth of the antenna is widened, the waveform is clean, the tailing is small, the radiation capacity of the antenna is maximized, and the directional detection drilling radar system has the characteristics of small volume, light weight, high fidelity of a transmitting signal, high working frequency bandwidth and strong anti-interference capacity, can acquire stratum information by transmitting electromagnetic waves to the stratum, and particularly has the capability of measuring the target azimuth with high precision, the detection range is wide, the anti-interference capacity is strong, and the application prospect is good in the geological exploration field.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of one embodiment of the present invention;
fig. 2 is a schematic diagram of the structure of the first dipole antenna element in fig. 1;
fig. 3 is a schematic diagram of a structure of the second dipole antenna element in fig. 1;
fig. 4 is a graph of return loss of a transmitting antenna in one embodiment of the invention;
FIG. 5 is a graph of return loss for a receiving antenna in one embodiment of the invention;
fig. 6 is an E-plane directivity diagram of a transmitting antenna at 100MHz in one embodiment of the invention;
fig. 7 is an H-plane pattern of a transmitting antenna at 100MHz in one embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the present invention, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present invention, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present invention, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the invention can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Wherein, fig. 1 shows a reference direction coordinate system of an embodiment of the present invention, and the embodiment of the present invention is described below with reference to directions shown in fig. 1, fig. 2 and fig. 3.
An embodiment of the present invention provides a borehole radar system for directional sounding, referring to fig. 1, 2 and 3, including a transmitting antenna 100 and a receiving antenna 200 sequentially disposed along a borehole direction, the transmitting antenna 100 being capable of radiating a signal to a geological body around the borehole, the receiving antenna 200 being for receiving a signal reflected by a geological body 700 around the borehole, the receiving antenna 200 including a plurality of first dipole antenna units 300 disposed along an inner circumference, the first dipole antenna units 300 including first and second metal arms 310 and 320 sequentially disposed along the borehole direction, the first metal arm 310 including first upper and lower metal arms 311 and 312 disposed at intervals along the borehole direction, a first loading resistor 313 disposed between the first upper and lower metal arms 311 and 312 for electrical connection, the second metal arm 320 including second upper and lower metal arms 321 and 322 disposed at intervals along the borehole direction, the second upper metal arm 321 and the second lower metal arm 322 are electrically connected by a second loading resistor 323, the transmitting antenna 100 of the drilling radar system for directional detection radiates electromagnetic waves in 360 degrees around the drilling hole, the receiving antenna 200 receives electromagnetic waves reflected by the geological anomalies 700 around the drilling hole, and the receiving antenna 200 processes reflected electromagnetic wave signals from objects received by a plurality of first dipole antenna units 300 in the receiving antenna 200 at the same time, so that the specific orientation of the geological anomalies 700 around the drilling hole can be judged with high precision, and the directional function is realized, wherein the arrangement of the first loading resistor 313 and the second loading resistor 323 remarkably improves the impedance matching of the antenna, widens the working bandwidth of the antenna, ensures clean waveforms and small trailing, ensures that the radiation capacity of the antenna reaches the strongest, and the drilling radar system for directional detection has the advantages of small volume, the method has the characteristics of light weight, high fidelity of the transmitted signal, wide working frequency band and strong anti-interference capability, can acquire formation information by transmitting electromagnetic waves to the formation and utilizing the propagation characteristics of the electromagnetic waves in the formation, thereby explaining underground structures, and has the capability of measuring the target azimuth angle with high precision, wide detection range, strong anti-interference capability and good application prospect in the field of geological exploration.
In some embodiments, the first upper metal arm 311, the first lower metal arm 312, the second upper metal arm 321 and the second lower metal arm 322 are all metal columns, and the receiving antenna 200 is cut off at the middle position of the first upper metal arm 311 and the first lower metal arm 312 and is electrically connected with the first loading resistor 313 and the second loading resistor 323, so that impedance matching of the antenna is significantly improved, working bandwidth of the antenna is widened, waveforms are clean, tailing is small, and radiation capability of the antenna is strongest.
Preferably, the transmitting antenna 100 includes a second dipole antenna unit 400, the second dipole antenna unit 400 includes a third metal arm 410 and a fourth metal arm 420 that are sequentially disposed along a drilling direction, the third metal arm 410 includes a third upper metal arm 411 and a third lower metal arm 412 that are disposed at intervals along the drilling direction, a third loading resistor 413 is disposed between the third upper metal arm 411 and the third lower metal arm 412 to perform electrical connection, the fourth metal arm 420 includes a fourth upper metal arm 421 and a fourth lower metal arm 422 that are disposed at intervals along the drilling direction, a fourth loading resistor 432 is disposed between the fourth upper metal arm 421 and the fourth lower metal arm 422 to perform electrical connection, and the third upper metal arm 411, the third lower metal arm 412, the fourth upper metal arm 421 and the fourth lower metal arm 422 are hollow tubes.
The borehole radar system for directional detection further comprises a coaxial cable 500 extending along the drilling direction, a first feeding device 331 is arranged between the first metal arm 310 and the second metal arm 320, a second feeding device 431 is arranged between the third metal arm 410 and the fourth metal arm 420, the coaxial cable 500 is connected with the first feeding device 331 and the second feeding device 431, a radar host is arranged on the ground outside the drilling hole, the top end of the coaxial cable 500 is connected with the radar host, a computer for processing signals is connected with the radar host, when encountering the abnormal body 700 of the well Zhou Dexia, the detection result is transmitted to the ground through the coaxial cable 500, and subsequent data processing work is carried out through the computer, the position information of the abnormal body 700 of the well Zhou Dexia can be known with high precision, it is understood that in some embodiments, the first feeding device 331 is connected with the first metal arm 310 and the second metal arm 320 through a first connecting part 330, the second feeding device 431 is connected with the third metal arm 410 and the fourth metal arm 420 through a second connecting part 430, preferably, the first connecting part 330 and the second connecting part 430 comprise a solder, and the echo receiving antenna 200 is transmitted to the ground.
Preferably, a radar host is connected to the coaxial cable 500, and the radar host is used for controlling the transmitting antenna and converting electromagnetic echo signals into digital signals, and the computer is used for realizing control of the radar host and data acquisition and processing so as to acquire the position information of the abnormal body of the well Zhou Dexia.
In some embodiments, the receiving antenna 200 includes a first casing 210, a plurality of first dipole antenna units 300 are disposed around an inner circumference of the first casing 210, a first fixed material pipe 230 is disposed in the first casing 210, the first fixed material pipe 230 is disposed on an inner circumference of the plurality of first dipole antenna units 300, a first channel 220 is disposed in the first fixed material pipe 230 along a drilling direction, the transmitting antenna 100 includes a second casing 110, a third metal arm 410 and a fourth metal arm 420 are disposed in the second casing 110, a second channel 120 is disposed in the third metal arm 410 and the fourth metal arm 420 along the drilling direction, the coaxial cable 500 is connected to the first feeding device 331 through the first channel 220, and is connected to the second feeding device 431 through the second channel 120, the first channel 220 and the second channel 120 are used for placing the coaxial cable 500, that is, the receiving antenna 200 and the transmitting antenna 100 are hollow structures so as to connect to the feeding device 331 in the center, so as to effectively reduce coupling effect between the coaxial cable and the omni-directional dipole transmitting antenna in the well, clean waveforms thereof, and simultaneously reduce the weight of the omni-directional dipole transmitting antenna in the well.
Referring to fig. 1, the second housing 110 is provided with a second fixed material tube 130 at an inner periphery thereof, the third metal arm 410 and the fourth metal arm 420 are located between the second fixed material tube 130 and the second housing 110, the second channel 120 is disposed at an axial position of the second fixed material tube 130, a groove for placing the coaxial cable 500 is preferably formed in the second fixed material tube 130, the second housing 110 encloses the second fixed material tube 130 for protecting an internal antenna structure, preferably, a relative dielectric constant of the first housing 210 and the second housing 110 is 3-8 (e.g. glass fiber reinforced plastic), and a relative dielectric constant of the second fixed material tube 130 is 3-8, so as to improve impedance matching of the antenna, widen an operating bandwidth of the antenna, and improve radiation capability of the antenna, and the groove in the second fixed material tube 130 is used for connecting the coaxial cable 500 and the central feeding device 331.
Referring to fig. 2 and 3, the lower end of the first lower metal arm 312 is tapered conical from top to bottom, the upper end of the second upper metal arm 321 is tapered conical from bottom to top, the lower end of the third lower metal arm 412 is tapered conical from top to bottom, the upper end of the fourth upper metal arm 421 is tapered conical from bottom to top, preferably, two ends of the first connection portion 330 are respectively electrically connected with the narrow end of the first lower metal arm 312 and the narrow end of the third lower metal arm 412, and the tapered and conical structures can effectively attenuate the currents propagated outwards from the end portions, increase the bandwidths of the omni-directional dipole transmitting antenna in the well and the receiving antenna in the well, reduce the end portion reflection, realize the currents propagated outwards from the end portions, increase the bandwidths of the antennas, reduce the end portion reflection, and facilitate the placement of the coaxial cable and the connection of the feeding device.
As a preferred embodiment of the present invention, the resistance values of the first loading resistor 313, the second loading resistor 323, the third loading resistor 413 and the fourth loading resistor 432 are all in the range of 10Ω -350Ω, so as to improve impedance matching, expand bandwidth, and have graduations on the outer surface of the coaxial cable 500 along the drilling direction, so as to assist in determining the distances of the transmitting antenna 100 and the receiving antenna 200 penetrating into the drilling hole.
In some embodiments, the first loading resistor 313 is located at a middle position of the first metal arm 310, the second loading resistor 323 is located at a middle position of the second metal arm 320, the third loading resistor 413 is located at a middle position of the third metal arm 410, and the fourth loading resistor 432 is located at a middle position of the fourth metal arm 420.
Referring to fig. 1, a casing 600 is disposed within a borehole, and both the transmitting antenna 100 and the receiving antenna 200 are positioned within the casing 600. In some embodiments, the transmitting antenna 100 is positioned on top of the receiving antenna 200, the transmitting antenna 100 is a borehole omni-directional dipole transmitting antenna, and the receiving antenna 200 is a borehole array receiving antenna.
As a preferred embodiment of the present invention, the first dipole antenna units 300 are provided with 6, 6 first dipole antenna units 300 are sequentially distributed at 60 ° intervals along the circumferential direction of the sleeve 600, the 6 first dipole antenna units 300 simultaneously receive reflected electromagnetic waves from a target, the receiving antenna 200 does not need to be rotated, the six dipole antenna units 300 do not need to sequentially transmit and receive electromagnetic waves to and from the transmitting antenna 100, the detection efficiency is greatly improved, preferably, the diameter of the first dipole antenna units 300 is smaller than one fifth of the diameter of the sleeve 600, the volume and the weight of the array antenna in a well are reduced, the detection and construction are convenient, the mutual coupling effect between the array antennas (i.e. the 6 dipole antenna units 300) is reduced, the waveform is clean, the tailing is small, the difference of the arrival time of the electromagnetic waves received by the six dipole antenna units 300 is obvious during the subsequent signal processing, the target position calculation is convenient, and the antenna miniaturization technology of resistor loading is matched, so that the volume of the antenna is reduced, the use is convenient in the detection and construction process, and the applicability is strong.
Preferably, the transmitting antenna 100 uses the running return loss (S11) curve graph of the CST simulation as shown in fig. 4, and the operating band of the transmitting antenna is greater than 80MHz and the operating band of the transmitting antenna is smaller than-10 dB, so that the transmitting antenna has higher bandwidth, good impedance matching, higher radiation efficiency, meets the requirement of the return loss index of the antenna, and has good antenna operating performance.
As shown in fig. 6 and 7, the E-plane and H-plane patterns of the transmitting antenna 100 at 100MHz show that the transmitting antenna 100 in this embodiment has good omni-directional characteristics.
In this embodiment, a graph of a return loss (S11) curve of the receiving antenna 200 running by using CST simulation is shown in fig. 5, and the operating frequency band of the receiving antenna 200 is smaller than-10 dB in the range of 80MHz to 125MHz, so that the impedance matching is good, the radiation efficiency is high, the requirement of the return loss index of the antenna is satisfied, and the working performance of the antenna is good.
In the description of the present specification, reference to the terms "example," "embodiment," or "some embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present invention is, of course, not limited to the above-described embodiments, and one skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and these equivalent modifications or substitutions are intended to be included in the scope of the present invention as defined in the claims.
Claims (10)
1. A borehole radar system for directional probing, characterized by: including transmitting antenna and the receiving antenna that sets gradually along the drilling direction, transmitting antenna can be to the geological body radiation signal around the drilling, the receiving antenna is used for receiving the signal of geological body reflection around the drilling, the receiving antenna includes a plurality of first dipole antenna units that set up along the inner periphery, first dipole antenna unit include with along the first metal arm and the second metal arm that the drilling direction set gradually, first metal arm includes first upper metal arm and the first metal arm that sets up along the drilling direction interval, first upper metal arm with be equipped with first loading resistor between the first metal arm and carry out the electricity and be connected, second metal arm includes along the second upper metal arm and the second metal arm that the drilling direction interval set up, second upper metal arm with be equipped with second loading resistor between the second metal arm and carry out the electricity and be connected.
2. The borehole radar system for directional probing as recited in claim 1 wherein: the transmitting antenna comprises a second dipole antenna unit, the second dipole antenna unit comprises a third metal arm and a fourth metal arm which are sequentially arranged along the drilling direction, the third metal arm comprises a third upper metal arm and a third lower metal arm which are arranged along the drilling direction at intervals, a third loading resistor is arranged between the third upper metal arm and the third lower metal arm to be electrically connected, the fourth metal arm comprises a fourth upper metal arm and a fourth lower metal arm which are arranged along the drilling direction at intervals, and a fourth loading resistor is arranged between the fourth upper metal arm and the fourth lower metal arm to be electrically connected.
3. A borehole radar system for directional probing as recited in claim 2 wherein: including the coaxial cable that extends along drilling direction, first metal arm with be connected with first power supply unit between the second metal arm, third metal arm with be connected with second power supply unit between the fourth metal arm, coaxial cable with first power supply unit with second power supply unit links to each other, is equipped with the radar host computer on the outside subaerial of drilling, coaxial cable's top even with the radar host computer links to each other, be connected with the computer that is used for handling the signal on the radar host computer.
4. A borehole radar system for directional probing as recited in claim 3 wherein: the receiving antenna comprises a first shell, a plurality of first dipole antenna units are arranged around the inner periphery of the first shell, a first fixed material pipe is arranged in the first shell and is positioned on the inner periphery of the plurality of first dipole antenna units, a first channel is arranged in the first fixed material pipe along the drilling direction, the transmitting antenna comprises a second shell, a third metal arm and a fourth metal arm are arranged in the second shell, a second channel is arranged in the third metal arm and the fourth metal arm along the drilling direction, and a coaxial cable penetrates through the first channel and is connected with the first feeding device and penetrates through the second channel and is connected with the second feeding device.
5. The borehole radar system for directional probing as recited in claim 4 wherein: the inner periphery of second casing is equipped with the fixed material pipe of second, the third metal arm with the fourth metal arm all is located the fixed material pipe of second with between the second casing, the second passageway is established the axis position department of the fixed material pipe of second, be equipped with on the fixed material pipe of second and be used for placing the recess of coaxial cable.
6. A borehole radar system for directional probing as recited in claim 3 wherein: the lower end of the first lower metal arm is conical gradually narrowing from top to bottom, the upper end of the second upper metal arm is conical gradually narrowing from bottom to top, the lower end of the third lower metal arm is conical gradually narrowing from top to bottom, and the upper end of the fourth upper metal arm is conical gradually narrowing from bottom to top.
7. A borehole radar system for directional probing as recited in claim 3 wherein: the resistance values of the first loading resistor, the second loading resistor, the third loading resistor and the fourth loading resistor are all in the range of 10 omega-350 omega, and scales are arranged on the outer surface of the coaxial cable along the drilling direction.
8. A borehole radar system for directional probing as recited in claim 2 wherein: the first loading resistor is located at the middle position of the first metal arm, the second loading resistor is located at the middle position of the second metal arm, the third loading resistor is located at the middle position of the third metal arm, and the fourth loading resistor is located at the middle position of the fourth metal arm.
9. The borehole radar system for directional probing as recited in claim 1 wherein: the casing is arranged in the borehole, the transmitting antenna and the receiving antenna are both positioned in the casing, the transmitting antenna is an omni-directional dipole transmitting antenna in the well, and the receiving antenna is an array receiving antenna in the well.
10. The borehole radar system for directional probing as recited in claim 9 wherein: the number of the first dipole antenna units is 6, the 6 first dipole antenna units are sequentially distributed at 60-degree intervals along the circumferential direction of the sleeve, and the diameter of each first dipole antenna unit is smaller than one fifth of the diameter of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311523873.6A CN117724090A (en) | 2023-11-15 | 2023-11-15 | Drilling radar system for directional detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311523873.6A CN117724090A (en) | 2023-11-15 | 2023-11-15 | Drilling radar system for directional detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117724090A true CN117724090A (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311523873.6A Pending CN117724090A (en) | 2023-11-15 | 2023-11-15 | Drilling radar system for directional detection |
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| Country | Link |
|---|---|
| CN (1) | CN117724090A (en) |
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2023
- 2023-11-15 CN CN202311523873.6A patent/CN117724090A/en active Pending
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