CN107453020B - A kind of matching reception device with brill electromagnetic wave receiving antenna - Google Patents
A kind of matching reception device with brill electromagnetic wave receiving antenna Download PDFInfo
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- CN107453020B CN107453020B CN201610369565.6A CN201610369565A CN107453020B CN 107453020 B CN107453020 B CN 107453020B CN 201610369565 A CN201610369565 A CN 201610369565A CN 107453020 B CN107453020 B CN 107453020B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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Abstract
The invention discloses a kind of with the matching reception device for boring electromagnetic wave receiving antenna, receiving module is matched including front end, it is arranged on the outer surface of the drill collar at receiving antenna end, for receiving electromagnetic wave signal and amplifying the electromagnetic wave signal and the synthesis before transmission；Remote processor module is arranged far from the inside of the drill collar of receiving antenna, receives the output signal that the front end matches receiving module by coaxial cable, decomposes to the output signal, while matching receiving module for the front end and providing power supply signal.The problem of which solves the number of the writing decaying due to the transmission of long range in the prior art, and then signal-to-noise ratio is deteriorated.The quality that ensure that electromagnetic wave signal is improved with the precision for boring Electromagnetic Wave Detection.
Description
Technical field
The invention belongs to oil and gas development and Exploration Domain more particularly to a kind of matching receptions with brill electromagnetic wave receiving antenna
Device.
Background technique
Electromagnetic wave signal is commonly used in measurement while drilling field, on the one hand carries out resistivity measurement using electromagnetic wave signal,
On the other hand the wireless data short pass of nearly drill bit is carried out using electromagnetic wave signal.But in subsurface environment, due to drilling fluid,
The relative atmospherics such as layer are all the extremely low media of conductivity, therefore electromagnetic wave is emitted by transmitting coil, by drilling fluid and stratum
It is transferred to receiving coil, the signal that receiving coil receives all is very faint signal.In order to be extracted from these signals
Effective formation resistivity information, or the data information of nearly drill bit wireless transmission, it is necessary to which signal receiving antenna is tuned
It matches and signal is amplified.
During signal receiving antenna is tuned matching and is amplified to signal, the signal-to-noise ratio of signal is very heavy
It wants.Signal-to-noise ratio is higher, and received signal quality is better.The signal-to-noise ratio of signal is received for handling the resistivity calculated
Precision, or the bit error rate of the transmission data of decoding out, are crucial.
In actual engineering, receiving antenna is all mounted in inside the groove of drill collar, corresponding receiving processing circuit
It is mounted on the electronics skeleton in the farther away drill collar of antenna.And electronics skeleton due to structure and interference the problem of, Bu Nengzhi
It connects and is mounted on the inside of drill collar antenna slot, can be only installed at the inside of drill collar other than all antennas.In this case, antenna receives
To signal require to guide on the circuit board of circuit framework by very long cable using the deep hole inside drill collar.By
Very faint in signal that antenna receives itself, after the cable through long-distance, signal will necessarily further decline
Subtract.But noise source is various in the transmission process of signal, and will not be decayed, therefore the signal-to-noise ratio of signal can further become
Difference.Meanwhile subsequent resonance matching circuit is tuned to the circuit system collectively formed by antenna and long-distance cable line,
It tunes effect and also necessarily has a greatly reduced quality.
To sum up, the application propose it is a kind of raising While drilling system in electromagnetic wave receive signal signal-to-noise ratio method to solve on
State problem.
Summary of the invention
The first technical problem to be solved by the present invention is to need to provide electromagnetic wave in a kind of raising While drilling system to receive letter
Number signal-to-noise ratio method
In order to solve the above-mentioned technical problem, embodiments herein provides a kind of with the matching for boring electromagnetic wave receiving antenna
Reception device, including front end match receiving module, are arranged on the outer surface of the drill collar at receiving antenna end, for receiving electromagnetic wave
Signal and by the electromagnetic wave signal amplify with transmit before synthesis；Remote processor module is arranged far from reception day
The inside of the drill collar of line receives the output signal that the front end matches receiving module by coaxial cable, to the output signal
It is decomposed, while matching receiving module for the front end and power supply signal is provided.
Preferably, matching receiving module in front end includes: antenna matching unit, and adjustment, which receives frequency, makes receiving antenna and electromagnetism
Wave signal matches；Front end amplifying unit is connected, for what is received to antenna matching unit with the antenna matching unit
Electromagnetic wave signal carries out low noise amplification；Signal synthesis unit is connected, for believing electromagnetic wave with the front end amplifying unit
Number synthesize and transmitted via coaxial cable with the power supply signal of the front end amplifying unit.
Preferably, remote processor module includes: power supply unit, provides DC power supply for the front end amplifying unit；Signal
Decomposition unit, for being decomposed to the signal received by coaxial cable.
Preferably, signal synthesis unit includes first capacitor, the first inductance and coaxial cable, and the one of the first capacitor
End is connected with the output end of the front end amplifying unit, and the other end is connected with one end of first inductance；Described
The other end of one inductance is connected with the power end of the front end amplifying unit；The tie point of the first capacitor and the first inductance
It is connected with the inner core of the coaxial cable；The ground terminal of the outer shield line of the coaxial cable and the front end amplifying unit
It is connected.
Preferably, signal decomposition unit include the second inductance, the second capacitor and coaxial cable, the one of second inductance
End is connected with the output end of said supply unit, and the other end is connected with one end of second capacitor；Second electricity
The other end of appearance is for connecting subsequent process circuit to provide it electromagnetic wave signal；The company of second inductance and the second capacitor
Contact is connected with the inner core of the coaxial cable；The outer shield line of the coaxial cable and the ground terminal of subsequent process circuit
It is connected.
Preferably, signal synthesis unit includes first capacitor, the first inductance, third capacitor, third inductance and coaxial electrical
Cable, the first capacitor are connected with the third inductance, the output end phase of one end of series arm and the front end amplifying unit
Connection, the other end are connected with first inductance with one end of the shunt circuit of the third capacitor；The shunt circuit
The other end be connected with the power end of the front end amplifying unit；The tie point of the series arm and shunt circuit with it is described
The inner core of coaxial cable is connected；The outer shield line of the coaxial cable is connected with the ground terminal of the front end amplifying unit
It connects.
Preferably, signal decomposition unit includes the second inductance, the second capacitor, the 4th inductance, the 4th capacitor and coaxial electrical
Cable, second inductance is in parallel with the 4th capacitor, and one end of shunt circuit is connected with the output end of said supply unit,
Its other end is connected with second capacitor with one end of the series arm of the 4th inductance；The series arm it is another
End is for connecting subsequent process circuit to provide it electromagnetic wave signal；The tie point and institute of the shunt circuit and series arm
The inner core for stating coaxial cable is connected；The outer shield line of the coaxial cable is connected with the ground terminal of subsequent process circuit.
Preferably, the inductance value and electricity in the signal synthesis unit and signal decomposition unit are determined according to following expression
Capacitance:
Wherein, f is with the frequency for boring electromagnetic wave, and L is each inductance in the signal synthesis unit and signal decomposition unit
Inductance value, C are the capacitance of each capacitor in the signal synthesis unit and signal decomposition unit.
Preferably, signal synthesis unit include first capacitor, the first inductance, third capacitor, third inductance, the 5th capacitor,
5th inductance, the 7th capacitor, the 7th inductance and coaxial cable, the first capacitor, third inductance with by the 7th capacitor
With the shunt circuit series connection of the 7th inductance composition, one end of series arm is connected with the output end of the front end amplifying unit,
Its other end and first inductance, third capacitor are in parallel with composed by the series arm comprising the 5th capacitor and the 5th inductance
The inner core of the one end in circuit and the coaxial cable is connected, and should include the first inductance, third capacitor, the 5th capacitor and the 5th
The other end of the shunt circuit of inductance is connected with the power end of the front end amplifying unit；The outer shield of the coaxial cable
Line is connected with the ground terminal of the front end amplifying unit.
Preferably, signal decomposition unit include the second inductance, the second capacitor, the 4th inductance, the 4th capacitor, the 6th inductance,
6th capacitor, the 8th inductance, the 8th capacitor and coaxial cable, second inductance, the 4th capacitor with by the 6th inductance
In parallel with the series arm of the 6th capacitor composition, one end of shunt circuit is connected with the output end of said supply unit, another
Series arm composed by one end and second capacitor, the 4th inductance and the shunt circuit comprising the 8th capacitor and the 8th inductance
One end and the inner core of the coaxial cable be connected, should include the second capacitor, the 4th inductance, the 8th capacitor and the 8th inductance
Series arm the other end for connecting subsequent process circuit to provide it electromagnetic wave signal；The outer layer of the coaxial cable
Shielding line is connected with the ground terminal with subsequent process circuit.
Compared with prior art, one or more embodiments in above scheme can have following advantage or beneficial to effect
Fruit:
Local amplification is carried out to electromagnetic wave signal by the way that front end amplifying unit is arranged in nearly antenna end, and utilizes coaxial electrical
Cable is completed at the same time the conllinear transmission of power supply signal and electromagnetic wave signal, solves and is caused in the prior art due to the transmission of long range
Signal decaying, and then the problem of signal-to-noise ratio variation.The quality that ensure that electromagnetic wave signal is improved with the essence for boring Electromagnetic Wave Detection
Degree.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target and other advantages of the invention can be wanted by following specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide to the technical solution of the application or further understanding for the prior art, and constitutes specification
A part.Wherein, the attached drawing for expressing the embodiment of the present application is used to explain the technical side of the application together with embodiments herein
Case, but do not constitute the limitation to technical scheme.
Fig. 1 is the structural schematic diagram according to the drill collar mounting arrangement of the embodiment of the present invention；
Fig. 2 is the structural representation with the matching reception device for boring electromagnetic wave receiving antenna according to first embodiment of the invention
Figure；
Fig. 3 is the structural representation with the matching reception device for boring electromagnetic wave receiving antenna according to second embodiment of the invention
Figure；
Fig. 4 a- Fig. 4 b is the resonance circuit schematic diagram with the matching reception device for boring electromagnetic wave receiving antenna；
Fig. 5 a- Fig. 5 b is the use with the matching reception device for boring electromagnetic wave receiving antenna according to third embodiment of the invention
In the resonance circuit schematic diagram of transmission double frequency electromagnetic wave signal.
The reference numerals are as follows:
10: drill collar ontology
20: receiving antenna slot
30: receiving antenna
40: antenna match receiving module with front end between cable hole
50: antenna match receiving module with front end between connecting line
60: the placing groove of the front end matching receiving module of nearly antenna end
70: the front end of nearly antenna end matches receiving module
71: antenna matching unit
72: front end amplifying unit
73: the power end of front end amplifying unit
74: the output end of front end amplifying unit
75: the ground terminal of front end amplifying unit
76: the first inductance
77: first capacitor
78: third capacitor
79: third inductance
80: coaxial cable
81: the inner core of coaxial cable
82: the outer shield line of coaxial cable
90: coaxial cable moves towards hole
100: remote processor module
101: the second capacitors
102: the second inductance
103: the aftertreatment systems comprising power supply unit
104: the power output end of aftertreatment systems
105: the input terminal of aftertreatment systems
106: the ground terminal of aftertreatment systems
107: the four capacitors
108: the four inductance
110: the placing groove of remote processor module
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching relevant art effect can fully understand and implement.This Shen
Please each feature in embodiment and embodiment, can be combined with each other under the premise of not colliding, be formed by technical solution
It is within the scope of the present invention.
First embodiment:
Fig. 1 is according to the structural schematic diagram of the drill collar mounting arrangement of the embodiment of the present invention, and Fig. 2 is real according to the present invention first
The structural schematic diagram with the matching reception device for boring electromagnetic wave receiving antenna for applying example, is described in detail below with reference to Fig. 1 and Fig. 2.
In the first embodiment of the present invention, the drill collar outer surface first near receiving antenna processes one and can place
The slot of circuit board (as shown in the 60 of Fig. 1).This slot is under the premise of guaranteeing drill collar mechanical strength, as close possible to antennal interface
Position.Arrange that resonance matching receives circuit in the slot, resonance matching receives circuit and is only tuned to receiving antenna, can
Greatly improve tuning effect.In the matching reception device with brill electromagnetic wave receiving antenna of the embodiment of the present invention, by electromagnetism
The reception amplification of wave signal is separated with subsequent processing module, matching receiving module 70 is arranged in nearly antenna end, to guarantee electricity
The further place of the complete pair signals of remote processor module 100 is arranged in distal end in the reliable reception and low noise amplification of magnetostatic wave signal
Reason.
Specifically, as shown in Figure 1, carrier of the drill collar ontology 10 as entire instrument, receiving antenna 30 are wound on reception
In antenna slot 20, receiving antenna slot 20 and receiving antenna 30 are filled and are protected by composite material, are wrapped up in the stainless steel with gap outside and are protected
Shield.
On the outer surface for the drill collar that receiving antenna end is arranged in front end matching receiving module 70, that is, it is located at the brill of nearly antenna end
In placing groove 60 on outer surface quickly, the placing groove 60 of the front end matching receiving module of nearly antenna end is protected by cover board.It receives
It is connected between antenna 30 and front end matching receiving module 70 by connecting line 50, is matched in receiving antenna 30 with front end and receive mould
The cable hole 40 for 50 cabling of connecting line is additionally provided between block 70.
Front end matching receiving module 70 is connected by coaxial cable 80 with remote processor module 100, coaxial cable it is interior
Core is the transmission channel being made of inner conductor, dielectric and outer conductor three parts with common central axis, in inner core
There is one layer of shielding line outside outer conductor.In an embodiment of the present invention, believed using coaxial cable simultaneous transmission Electromagnetic Wave Detection
Number and power supply signal, one side power supply is connected to the circuit board of nearly antenna from receiving processing circuit plate, and will be even
The circuit board for being connected to nearly antenna handles amplified reception electromagnetic wave signal and is connected to receiving processing circuit plate.
It matches in front end and is provided on the drill collar bar between receiving module 70 and remote processor module 100 for coaxial cable 80
The cable hole 90 of wiring, remote processor module 100 are remotely from the placing groove 110 of the inside of the drill collar of receiving antenna, put
Setting slot 110 also has the cover board of protection internal circuit.
Front end matching receiving module 70 is mainly used for receiving electromagnetic wave signal, and the signal received is amplified and passed
Signal synthesis before defeated.It includes that antenna matching unit 71, front end amplifying unit 72 and signal close that front end, which matches receiving module 70,
At unit (the first inductance 76, first capacitor 77 and coaxial cable 80).
Specifically, as shown, the both ends of receiving antenna 30 are connected to the input terminal of antenna matching unit 71, antenna match
The output end of unit 71 is connected to the input terminal of front end amplifying unit 72.Wherein, antenna matching unit 71 is generally resonance matching
Circuit is received, for the reception frequency according to the frequency of electromagnetic wave signal adjustment antenna matching unit 71, antenna is matched,
Antenna is enabled to obtain optimal performance under received electromagnetic wave signal frequency.Front end amplifying unit 72 is generally low noise fortune
Unit is put, the electromagnetic wave signal for exporting to antenna matching unit 71 carries out low noise amplification.
Signal synthesis unit includes the first inductance 76, first capacitor 77 and coaxial cable 80, the connection between each element
Relationship is that the output end 74 of front end amplifying unit 72 is connected with one end of first capacitor 77, the power supply of front end amplifying unit 72
End 73 is connected with one end of the first inductance 76.77 other end of first capacitor is connected with the other end of the first inductance 76, and with
The inner core 81 of coaxial cable 80 connects, the transmission for power supply signal and the composite signal of Electromagnetic Wave Detection signal.Coaxial cable
80 outer shield line 82 is connected with the ground terminal 75 of front end amplifying unit 72 as signal ground.
Receiving antenna 30 receives the electromagnetic wave signal transmitted by stratum, obtains most by the matching of antenna matching unit 71
Good reception, then obtained detection signal is input to front end amplifying unit 72 and is amplified, improve the signal-to-noise ratio of signal.
The power supply signal and electromagnetic wave signal of front end amplifying unit 72 are transmitted via coaxial cable 80, and pass through first capacitor 77 and the
Connection relationship between one inductance 76 and first capacitor and the first inductance and coaxial cable carries out the synthesis of signal, realizes power supply
The multiplexing of signal and electromagnetic wave signal.
Specifically, power supply signal is direct current signal, electromagnetic wave signal is the higher AC signal of frequency.On the one hand, first
Inductance 76 directly can prevent AC signal by direct current signal, and first capacitor 77 then prevents direct current signal, therefore coaxial electrical
The power end 73 that the DC feedback signal of cable can directly be connected to front end amplifying unit 72 powers to it, and by front end amplifying unit
The electromagnetic wave signal of the exchange of 72 outputs is kept off other than power end 73, will not be had an impact to power supply.On the other hand, first capacitor
77 directly can prevent direct current signal by AC signal, therefore the DC feedback signal of coaxial cable will not be connected to front end amplification
The output end 74 of unit 72 keeps off the power supply signal of direct current other than output end 74, and what the process of the output end 74 was exaggerated
Electromagnetic wave signal can directly be connected to the inner core of coaxial cable 80.The inductance of the capacitance of first capacitor 77 and the first inductance 76
The frequency of value, the electromagnetic wave signal that can be exported according to front end amplifying unit 72 is suitably chosen.
In the prior art, the signal itself that antenna receives is very faint, is passing through very long cable, inevitable signal meeting
Further decaying, but noise source be it is various, will not decay, and then signal-to-noise ratio can further be deteriorated.And the present invention is implemented
The front end of example matches receiving module 70, carries out local put to the electromagnetic wave signal received provided with a front end amplifying unit 72
Greatly, and using coaxial cable 80 it is completed at the same time power supply and the transmission of electromagnetic wave signal, in this way by the signal of amplification, even if through
The transmission of the coaxial cable of long-distance, signal-to-noise ratio is also smaller by being influenced, and ensure that the quality of electromagnetic wave signal.Together
When, subsequent conditioning circuit is arranged in farther away circuit storehouse, both ensure that the mechanical strength of drill collar, and also do not increased processing cost.
In other embodiments of the invention, it is also set between the first inductance 76 and the power end 73 of front end amplifying unit 72
It is equipped with voltage regulation unit (not shown), voltage regulation unit is for adjusting the power supply signal being sent to from coaxial cable 80.
Remote processor module 100 is mainly used for the subsequent processing to received electromagnetic wave signal, due to the embodiment of the present invention
In use the conllinear transmission of power supply signal and electromagnetic wave signal, therefore be correspondingly arranged and be used at remote processor module 100
The power supply unit 103 and be used for power supply signal and electromagnetic wave signal that receiving module 70 is powered are matched to the front end near line end
The signal decomposition unit (the second capacitor 101, the second inductance 102 and coaxial cable 80) decomposed, as shown in Figure 2.
Power supply unit is generally power module, and the power supply signal in the embodiment of the present invention is direct current signal, it requires confession
The power module of electric unit has the output interface of DC power supply.It should be noted that in Fig. 2, with 103 table of functional block
What is shown is comprising the aftertreatment systems including power supply unit.Subsequent processing to signal may include filtering to signal, turn
It changes, formation resistivity is calculated using the signal received or obtains transmit one signal etc..
Signal decomposition unit includes the second capacitor 101, the second inductance 102 and coaxial cable 80, the company between each element
The relationship of connecing is that one end of the second capacitor 101 is connected with one end of the second inductance 102, and is connected to the inner core 81 of coaxial cable 80.
The outer shield line 82 of coaxial cable 80 is connected with the ground terminal 106 comprising the aftertreatment systems 103 including power supply unit.
The other end of second capacitor 101 is connected with the input terminal 105 comprising the aftertreatment systems 103 including power supply unit, and second
The other end of inductance 102 is connected with the power end 104 comprising the aftertreatment systems 103 including power supply unit.
On the one hand, remote processor module 100 is needed to match receiving module 70 by 80 forward end of coaxial cable and be fed, and second
Inductance 102 directly can prevent AC signal by direct current signal, and the second capacitor 101 then prevents direct current signal, therefore powers
The inner core that the DC power signal of unit output can directly be connected to coaxial cable 80 is that front end amplifying unit 72 provides direct current
Source, and the second capacitor 101 can prevent direct current signal, therefore DC power signal can be kept off to the input in aftertreatment systems
Other than end 105, i.e., the DC power signal will not have an impact the receiving end of aftertreatment systems.On the other hand, far-end
Reason module 100 receives the electromagnetic wave signal sent via coaxial cable 80, and the second capacitor 101 can directly pass through exchange letter
Number, simultaneously because the electromagnetic wave signal of received exchange, can be kept off the electricity in aftertreatment systems by the effect of the second inductance 102
Other than source 104, power supply unit will not be had an impact.
In an embodiment of the present invention, due to the received electromagnetic wave signal of subsequent process circuit be by being exaggerated signal,
Therefore it can guarantee to occur in transmission process even if signal to maintain certain signal strength decaying, simultaneously effective improve
The signal-to-noise ratio of the signal received.
Apply the present invention in the measurement with brill electromagnetic resistivity, is beneficial to improve measurement accuracy.Such as it is applied to
Nearly drill bit radio magnetic wave transmission is beneficial to reduce the bit error rate for the transmission data for decoding out.For electric with electromagnetic wave is bored
The measurement of resistance rate, nearly drill bit radio magnetic wave transmission communication etc..
Second embodiment:
Fig. 3 is the structural representation with the matching reception device for boring electromagnetic wave receiving antenna according to second embodiment of the invention
Figure, is illustrated below for the difference of itself and first embodiment.
If fixed in the measurement of electromagnetic resistivity using specific frequency (such as letter of common 2MHz
Number) electromagnetic wave signal, then signal synthesis unit and signal decomposition unit can take structure as shown in Figure 2 respectively.
On the basis of the signal synthesis unit of first embodiment, in the both ends parallel connection third capacitor 78 of the first inductance 76,
In 77 place branch of first capacitor series connection third inductance 79.Further, on the basis of the signal decomposition unit of first embodiment
On, in 101 place branch of the second capacitor the 4th inductance 108 of series connection, in the both ends of the second inductance 102 the 4th capacitor 107 in parallel.
When the used frequency with brill electromagnetic wave is f=2MHz, if taking the capacitance of all capacitors is C=
6.33nF, taking the inductance value of all inductance is that L=1uF, then capacitance and inductance value meet following relational expression:
As can be seen that the first inductance 76 and the shunt circuit of third capacitor 78 and the second inductance 102 and the 4th are electric at this time
In the frequency of 2MHz parallel resonance occurs for the shunt circuit for holding 107, that is to say, that at this moment equivalent resistance is for 2MHz
Infinity, i.e. shunt circuit are equivalent to for 2MHz and are directly disconnected, and the isolation effect of the AC signal of 2MHz is reached
It is best.The series arm of first capacitor 77 and third inductance 79 and the second capacitor 101 and the 4th inductance 108 are connected simultaneously
In the frequency of 2MHz series resonance occurs for branch, that is to say, that at this moment equivalent resistance is infinitesimal for 2MHz, that is, is gone here and there
Connection branch is equivalent to direct short-circuit for 2MHz, reaches best for the turn-on effect of the AC signal of 2MHz.
In the present embodiment, by being powered the conjunction of signal and electromagnetic wave signal using series resonance and parallel resonance
At with decomposition, the conllinear transmission of signal can be effectively realized.
Further, it is generally operational in due to measurement while-drilling instrument in the environment of condition very severe, such as by shallowly entering
In deep drilling process, operating ambient temperature can be from 30 DEG C to more than 175 DEG C.Therefore to devices such as inductance, the capacitors used
Performance requirement it is very high.And the inductance value size of high performance inductance is serial, capacitor capacitance size series selection is limited.
Therefore in other embodiments of the invention, using as shown in figures 4 a and 4b more capacitor combinations and more inductor combinations come
It realizes, realizes the capacitor of 6.33nF using three capacitor parallel connections of 6nF, 0.3nF and 0.03nF, and with three electricity of parallel connection
Hold the capacitor replaced in shunt-resonant circuit and series resonance branch respectively.
3rd embodiment:
It, can also be simultaneously using the electromagnetic wave signal of two kinds of frequencies to realize difference with electromagnetic resistivity is bored in Practical Project
The resistivity measurement of characteristic, such as 2MHz and 400KHz are generallyd use as signal frequency.Therefore, implement in third of the invention
In example, a kind of resonance circuit for being used for transmission double frequency electromagnetic wave signal is proposed to complete the synthesis of power supply signal and electromagnetic wave signal
With decomposition, as shown in figure 5 a and 5b.
Capacitor in Fig. 3 and inductance in parallel and concatenated part are replaced with the circuit of Fig. 5 a and Fig. 5 b respectively.Wherein, such as
Shown in Fig. 5 a, on the basis of the shunt circuit of the first inductance 76 and third capacitor 78 it is again in parallel one by capacitor and inductance group
At series arm, which may be implemented the parallel resonance of two frequency signals, it can while realize two frequencies
Equivalent resistance on point is infinitely great.As shown in Figure 5 b, one is increased in first capacitor 77 and the series arm of third inductance 79
The series resonance of two frequency signals may be implemented in a shunt circuit being made of inductance and capacitor, the series arm, it can
Realize that the equivalent resistance on two Frequency points is infinitely small simultaneously.Therefore the circuit in the present embodiment can be achieved at the same time 2MHz and
The equivalent resistance of 400KHz is infinitely great and infinitely small, while meeting being effectively isolated and effectively passing through for 2MHz and 400KHz.
It should be noted that Fig. 5, which is only gived, is used for transmission the humorous of double frequency electromagnetic wave signal in signal synthesis unit
Shake circuit, and for the form of the unit for the signal decomposition being set in remote processor module, those skilled in the art can lead to
It crosses understanding and is arranged in correspondence with its structure.In addition, the parameter of above-mentioned signal synthesis and the detailed process and capacitor and inductance decomposed
The determination of value can be found in previous embodiment or be obtained according to the correlation theory of circuit, repeat no more herein.
The embodiment of the present invention can greatly improve electromagnetic wave reception with the matching reception device for boring electromagnetic wave receiving antenna
The signal receiving performance of system, the i.e. signal-to-noise ratio of raising signal and corresponding sensitivity.Exist using the device of the embodiment of the present invention
With boring in electromagnetic resistivity measuring instrument, measurement accuracy or measurement range can be greatly improved, is further geology
Guiding provides more efficient data supporting.The application range of nearly drill bit wireless data transmission instrument receives limitation, especially exists
In low-resistance stratum or water-base drilling fluid, electromagnetic wave signal decaying is very serious, and it is very faint that antenna receives signal, often goes out
Existing signal transmission failure.In terms of applying the present invention to nearly drill bit wireless data transmission, nearly drill bit wireless data can effectively improve
The adaptability of transmission can be applied in low-resistance stratum or water-base drilling fluid.
Although disclosed herein embodiment it is as above, the content is only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (9)
1. a kind of with the matching reception device for boring electromagnetic wave receiving antenna, comprising:
Front end match receiving module, be arranged on the outer surface of the drill collar at receiving antenna end, for receive electromagnetic wave signal and
The electromagnetic wave signal is amplified and the synthesis before transmission, wherein the front end matches receiving module and includes:
Antenna matching unit, adjustment, which receives frequency, makes receiving antenna match with electromagnetic wave signal；
Front end amplifying unit is connected with the antenna matching unit, the electromagnetic wave letter for receiving to antenna matching unit
Number carry out low noise amplification；
Signal synthesis unit is connected with the front end amplifying unit, for by the electromagnetic wave signal through low noise amplification and institute
The power supply signal for stating front end amplifying unit synthesize and transmitted via coaxial cable；
Remote processor module is arranged far from the inside of the drill collar of receiving antenna, receives the front end by coaxial cable and matches
The output signal of receiving module decomposes the output signal, while matching receiving module for the front end and providing power supply
Signal.
2. the apparatus according to claim 1, which is characterized in that the remote processor module includes:
Power supply unit provides DC power supply for the front end amplifying unit；
Signal decomposition unit, for being decomposed to the signal received by coaxial cable.
3. the apparatus of claim 2, which is characterized in that the signal synthesis unit includes first capacitor, the first electricity
Sense and coaxial cable,
One end of the first capacitor is connected with the output end of the front end amplifying unit, the other end and first inductance
One end be connected；
The other end of first inductance is connected with the power end of the front end amplifying unit；
The first capacitor is connected with the tie point of the first inductance with the inner core of the coaxial cable；
The outer shield line of the coaxial cable is connected with the ground terminal of the front end amplifying unit.
4. device according to claim 3, which is characterized in that the signal decomposition unit includes the second inductance, the second electricity
Appearance and coaxial cable,
One end of second inductance is connected with the output end of said supply unit, and the one of the other end and second capacitor
End is connected；
The other end of second capacitor is for connecting subsequent process circuit to provide it electromagnetic wave signal；
Second inductance is connected with the tie point of the second capacitor with the inner core of the coaxial cable；
The outer shield line of the coaxial cable is connected with the ground terminal of subsequent process circuit.
5. the apparatus of claim 2, which is characterized in that the signal synthesis unit includes first capacitor, the first electricity
Sense, third capacitor, third inductance and coaxial cable,
The first capacitor is connected with the third inductance, the output end phase of one end of series arm and the front end amplifying unit
Connection, the other end are connected with first inductance with one end of the shunt circuit of the third capacitor；
The other end of the shunt circuit is connected with the power end of the front end amplifying unit；
The series arm is connected with the tie point of shunt circuit with the inner core of the coaxial cable；
The outer shield line of the coaxial cable is connected with the ground terminal of the front end amplifying unit.
6. device according to claim 5, which is characterized in that the signal decomposition unit includes the second inductance, the second electricity
Appearance, the 4th inductance, the 4th capacitor and coaxial cable,
Second inductance is in parallel with the 4th capacitor, and one end of shunt circuit is connected with the output end of said supply unit
It connects, the other end is connected with second capacitor with one end of the series arm of the 4th inductance；
The other end of the series arm is for connecting subsequent process circuit to provide it electromagnetic wave signal；
The shunt circuit is connected with the tie point of series arm with the inner core of the coaxial cable；
The outer shield line of the coaxial cable is connected with the ground terminal of subsequent process circuit.
7. device according to claim 6, which is characterized in that according to following expression determine the signal synthesis unit with
Inductance value and capacitance in signal decomposition unit:
Wherein, f is with the frequency for boring electromagnetic wave, and L is the inductance of each inductance in the signal synthesis unit and signal decomposition unit
Value, C are the capacitance of each capacitor in the signal synthesis unit and signal decomposition unit.
8. the apparatus of claim 2, which is characterized in that the signal synthesis unit includes first capacitor, the first electricity
Sense, third capacitor, third inductance, the 5th capacitor, the 5th inductance, the 7th capacitor, the 7th inductance and coaxial cable,
The first capacitor, third inductance are connected with the shunt circuit being made of the 7th capacitor and the 7th inductance, series connection branch
The one end on road is connected with the output end of the front end amplifying unit, the other end and first inductance, third capacitor and packet
One end of shunt circuit composed by series arm containing the 5th capacitor and the 5th inductance and the inner core phase of the coaxial cable
Connection should be put comprising the other end of the shunt circuit of the first inductance, third capacitor, the 5th capacitor and the 5th inductance with the front end
The power end of big unit is connected；
The outer shield line of the coaxial cable is connected with the ground terminal of the front end amplifying unit.
9. device according to claim 8, which is characterized in that the signal decomposition unit includes the second inductance, the second electricity
Appearance, the 4th inductance, the 4th capacitor, the 6th inductance, the 6th capacitor, the 8th inductance, the 8th capacitor and coaxial cable,
Second inductance, the 4th capacitor are in parallel with the series arm being made of the 6th inductance and the 6th capacitor, and parallel connection is returned
The one end on road is connected with the output end of said supply unit, the other end and second capacitor, the 4th inductance and includes the
One end of series arm composed by the shunt circuit of eight capacitors and the 8th inductance and the inner core of the coaxial cable are connected,
This includes the other end of the series arm of the second capacitor, the 4th inductance, the 8th capacitor and the 8th inductance for connecting subsequent processing
Circuit is to provide it electromagnetic wave signal；
The outer shield line of the coaxial cable is connected with the ground terminal of subsequent process circuit.
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| CN108880601B (en) * | 2018-06-20 | 2020-09-04 | 深圳无线电检测技术研究院 | Communication frequency selection method and device based on USRP |
| CN110085972B (en) * | 2019-05-06 | 2020-07-24 | 中国科学院地质与地球物理研究所 | Antenna transceiving circuit of while-drilling azimuth electromagnetic wave resistivity logging instrument |
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| CN102208920A (en) * | 2011-05-23 | 2011-10-05 | 辽宁金洋集团信息技术有限公司 | Long line transmission device for ultrasonic probe |
| CN203708252U (en) * | 2013-11-28 | 2014-07-09 | 郑州三和视讯技术有限公司 | Multiplexing frequency-selection antenna feeder equipment |
| CN105089646A (en) * | 2014-05-07 | 2015-11-25 | 中国石油化工股份有限公司 | Logging-while-drilling resistivity measuring device with data transmission function and method |
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