CN107453020A - A kind of matching reception device with brill electromagnetic wave reception antenna - Google Patents
A kind of matching reception device with brill electromagnetic wave reception antenna Download PDFInfo
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- CN107453020A CN107453020A CN201610369565.6A CN201610369565A CN107453020A CN 107453020 A CN107453020 A CN 107453020A CN 201610369565 A CN201610369565 A CN 201610369565A CN 107453020 A CN107453020 A CN 107453020A
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- inductance
- electric capacity
- signal
- coaxial cable
- electromagnetic wave
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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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- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of with the matching reception device for boring electromagnetic wave reception antenna, receiving module is matched including front end, it is arranged on the outer surface of the drill collar at reception antenna end, for receiving electromagnetic wave signal and being amplified the electromagnetic wave signal and the synthesis before transmission；Remote processor module, the inside of the drill collar of reception antenna is arranged far from, the output signal of the front end matching receiving module is received by coaxial cable, the output signal is decomposed, while matches receiving module for the front end and power supply signal is provided.Which solves causing signal attenuation due to the transmission of long range in the prior art, and then the problem of signal to noise ratio is deteriorated.The quality of electromagnetic wave signal is ensure that, 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 with brill electromagnetic wave reception antenna to receive
Device.
Background technology
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 electrical conductivity, therefore electromagnetic wave is launched by transmitting coil, by drilling fluid and stratum
Receiving coil is transferred to, 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 message that nearly drill bit is wirelessly transferred, it is necessary to be tuned to signal receiving antenna
Match and signal is amplified.
During matching is tuned to signal receiving antenna and signal is amplified, the signal to noise ratio of signal is very heavy
Will.Signal to noise ratio is higher, and the signal quality of reception is better.The resistivity that the signal to noise ratio of reception signal calculates for processing
Precision, or the bit error rate of the transmission data of decoding out are all most important.
In the engineering of reality, reception antenna is all mounted in inside the groove of drill collar, corresponding receiving processing circuit
On the electronics skeleton in antenna drill collar farther out.And electronics skeleton due to structure and interference the problem of, it is impossible to it is straight
Connect on the inside of drill collar antenna slot, can be only installed at the inner side of drill collar beyond all antennas.In this case, antenna receives
To signal be required for by very long cable, then guided to by the deep hole inside drill collar on the circuit board of circuit framework.By
Very faint in itself in the signal that antenna receives, after the cable through long-distance, signal will necessarily further decline
Subtract.But noise source is many in the transmitting procedure of signal, and it will not decay, therefore the signal to noise ratio of signal can further become
Difference.Meanwhile follow-up resonance matching circuit is that the circuit system collectively formed by antenna and long-distance cable line is tuned,
It tunes effect and also necessarily had a greatly reduced quality.
To sum up, on the application proposes a kind of method for improving the signal to noise ratio of electromagnetic wave reception signal in While drilling system to solve
State problem.
The content of the invention
One of technical problems to be solved by the invention are 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 reception antenna
Reception device, including front end matching receiving module, on the outer surface for the drill collar for being arranged on reception antenna end, for receiving electromagnetic wave
Signal and by the electromagnetic wave signal be amplified with transmit before synthesis；Remote processor module, it is arranged far from receiving day
The inside of the drill collar of line, the output signal of the front end matching receiving module is received by coaxial cable, to the output signal
Decomposed, while match receiving module for the front end and power supply signal is provided.
Preferably, matching receiving module in front end includes：Antenna matching unit, adjustment receives frequency make reception antenna and electromagnetism
Ripple signal matches；Front end amplifying unit, it is connected with the antenna matching unit, for what is received to antenna matching unit
Electromagnetic wave signal carries out low noise amplification；Signal synthesis unit, it is connected with the front end amplifying unit, for electromagnetic wave to be believed
Number synthesized with the power supply signal of the front end amplifying unit and be transmitted via coaxial cable.
Preferably, remote processor module includes：Power supply unit, dc source is provided for the front end amplifying unit；Signal
Resolving cell, for being decomposed to the signal received by coaxial cable.
Preferably, signal synthesis unit includes the first electric capacity, the first inductance and coaxial cable, and the one of first electric capacity
End is connected with the output end of the front end amplifying unit, and its 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 first electric capacity and the first inductance
It is connected with the Inner cores of the coaxial cable；The earth terminal of the outer shield line of the coaxial cable and the front end amplifying unit
It is connected.
Preferably, signal decomposition unit includes the second inductance, the second electric capacity and coaxial cable, and the one of second inductance
End is connected with the output end of said supply unit, and its other end is connected with one end of second electric capacity；Second electricity
The other end of appearance is used to connect subsequent process circuit to provide it electromagnetic wave signal；The company of second inductance and the second electric capacity
Contact is connected with the Inner cores of the coaxial cable；The outer shield line of the coaxial cable and the earth terminal of subsequent process circuit
It is connected.
Preferably, signal synthesis unit includes the first electric capacity, the first inductance, the 3rd electric capacity, the 3rd inductance and coaxial electrical
Cable, first electric capacity are connected with the 3rd inductance, one end of series arm and the output end phase of the front end amplifying unit
Connection, its other end are connected with first inductance with one end of the shunt circuit of the 3rd electric capacity；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 cores of coaxial cable are connected；The outer shield line of the coaxial cable is connected with the earth terminal of the front end amplifying unit
Connect.
Preferably, signal decomposition unit includes the second inductance, the second electric capacity, the 4th inductance, the 4th electric capacity and coaxial electrical
Cable, second inductance is in parallel with the 4th electric capacity, and one end of shunt circuit is connected with the output end of said supply unit,
Its other end is connected with second electric capacity with one end of the series arm of the 4th inductance；The series arm it is another
Hold 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 cores for stating coaxial cable are connected；The outer shield line of the coaxial cable is connected with the earth terminal of subsequent process circuit.
Preferably, the signal synthesis unit and the inductance value and electricity in signal decomposition unit are determined according to following expression
Capacitance：
Wherein, f is with the frequency for boring electromagnetic wave, and L is the signal synthesis unit and each inductance in signal decomposition unit
Inductance value, C are the capacitance of the signal synthesis unit and each electric capacity in signal decomposition unit.
Preferably, signal synthesis unit include the first electric capacity, the first inductance, the 3rd electric capacity, the 3rd inductance, the 5th electric capacity,
5th inductance, the 7th electric capacity, the 7th inductance and coaxial cable, first electric capacity, the 3rd inductance with by the 7th electric capacity
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 is formed in parallel with first inductance, the 3rd electric capacity with the series arm comprising the 5th electric capacity and the 5th inductance
The Inner cores of the one end in loop and the coaxial cable are connected, and should include the first inductance, the 3rd electric capacity, the 5th electric capacity 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 earth terminal of the front end amplifying unit.
Preferably, signal decomposition unit include the second inductance, the second electric capacity, the 4th inductance, the 4th electric capacity, the 6th inductance,
6th electric capacity, the 8th inductance, the 8th electric capacity and coaxial cable, second inductance, the 4th electric capacity with by the 6th inductance
In parallel with the series arm of the 6th electric capacity composition, one end of shunt circuit is connected with the output end of said supply unit, and its is another
The series arm that one end is formed with second electric capacity, the 4th inductance with the shunt circuit comprising the 8th electric capacity and the 8th inductance
One end and the Inner cores of the coaxial cable be connected, the second electric capacity, the 4th inductance, the 8th electric capacity and the 8th inductance should be included
Series arm the other end be used for connect subsequent process circuit to provide it electromagnetic wave signal；The outer layer of the coaxial cable
Shielding line is connected with the earth terminal with subsequent process circuit.
Compared with prior art, one or more of such scheme embodiment can have the following advantages that or beneficial to effect
Fruit：
By setting front end amplifying unit to carry out local amplification to electromagnetic wave signal in nearly antenna end, and utilize coaxial electrical
Cable completes the conllinear transmission of power supply signal and electromagnetic wave signal simultaneously, solves and is caused in the prior art due to the transmission of long range
Signal attenuation, and then the problem of signal to noise ratio variation.The quality of electromagnetic wave signal is ensure that, is improved with the essence for boring Electromagnetic Wave Detection
Degree.
Other advantages, the target of the present invention, and feature 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.The target and other advantages of the present invention can be wanted by following specification, right
Specifically noted structure is sought in book, and accompanying drawing to realize and obtain.
Brief description of the drawings
Accompanying drawing is used for providing to the technical scheme of the application or further understanding for prior art, and constitution instruction
A part.Wherein, the accompanying drawing for expressing the embodiment of the present application is used for the technical side for explaining the application together with embodiments herein
Case, but do not form the limitation to technical scheme.
Fig. 1 is the structural representation 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 reception antenna according to first embodiment of the invention
Figure；
Fig. 3 is the structural representation with the matching reception device for boring electromagnetic wave reception antenna according to second embodiment of the invention
Figure；
Fig. 4 a- Fig. 4 b are the resonance circuit schematic diagram with the matching reception device for boring electromagnetic wave reception antenna；
Fig. 5 a- Fig. 5 b are the use with the matching reception device for boring electromagnetic wave reception antenna according to third embodiment of the invention
In the resonance circuit schematic diagram of transmission double frequency electromagnetic wave signal.
Description of reference numerals is as follows：
10：Drill collar body
20：Reception antenna groove
30：Reception 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 standing groove of the front end matching receiving module of nearly antenna end
70：The front end matching receiving module of nearly antenna end
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 earth terminal of front end amplifying unit
76：First inductance
77：First electric capacity
78：3rd electric capacity
79：3rd inductance
80：Coaxial cable
81：The Inner cores of coaxial cable
82：The outer shield line of coaxial cable
90：Coaxial cable moves towards hole
100：Remote processor module
101：Second electric capacity
102：Second inductance
103：Aftertreatment systems comprising power supply unit
104：The power output end of aftertreatment systems
105：The input of aftertreatment systems
106：The earth terminal of aftertreatment systems
107：4th electric capacity
108：4th inductance
110：The standing groove of remote processor module
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, and how the present invention is applied whereby
Technological means solves technical problem, and the implementation process for reaching relevant art effect can fully understand and implement according to this.This Shen
Each feature that please be in embodiment and embodiment, can be combined with each other under the premise of not colliding, the technical scheme formed
Within protection scope of the present invention.
First embodiment：
Fig. 1 is according to the structural representation 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 representation with the matching reception device for boring electromagnetic wave reception antenna of example is applied, is described in detail with reference to Fig. 1 and Fig. 2.
In the first embodiment of the present invention, the drill collar outer surface first near reception antenna processes one and can placed
The groove of circuit board (as shown in the 60 of Fig. 1).This groove is on the premise of drill collar mechanical strength is ensured, as close possible to antennal interface
Position.Resonance matching receiving circuit is arranged in the groove, resonance matching receiving circuit is only tuned to reception antenna, can
It is greatly enhanced tuning effect.In the embodiment of the present invention is with the matching reception device for boring electromagnetic wave reception antenna, by electromagnetism
The reception amplification of ripple signal is separated with subsequent treatment module, matching receiving module 70 is set in nearly antenna end, to ensure electricity
The reliable reception and low noise amplification of magnetostatic wave signal, the further place of 100 complete pair signals of remote processor module is set in distal end
Reason.
Specifically, as shown in figure 1, carrier of the drill collar body 10 as whole instrument, reception antenna 30 are wound on reception
In antenna slot 20, reception antenna groove 20 and reception antenna 30 are filled and protected by composite, are wrapped up in the stainless steel with gap outside and are protected
Shield.
On the outer surface for the drill collar that front end matching receiving module 70 is arranged on reception antenna end, i.e., the brill positioned at nearly antenna end
In standing groove 60 on outer surface quickly, the standing groove 60 of the front end matching receiving module of nearly antenna end is protected by cover plate.Receive
Antenna 30 is connected between matching receiving module 70 with front end by connecting line 50, is matched in reception antenna 30 with front end and is received mould
The cable hole 40 for the cabling of connecting line 50 is additionally provided between block 70.
Front end matching receiving module 70 is connected by coaxial cable 80 with remote processor module 100, the Inner of coaxial cable
Core is the transmission channel being made up of the inner wire with common central shaft, dielectric and outer conductor three parts, in Inner cores
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, its one side power supply is connected to the circuit board of nearly antenna from receiving processing circuit plate, and will be even
It is connected to the reception electromagnetic wave signal after the circuit board processing amplification of nearly antenna and is connected to receiving processing circuit plate.
Match on the drill collar bar between receiving module 70 and remote processor module 100 and be provided with for coaxial cable 80 in front end
The cable hole 90 of wiring, remote processor module 100 are remotely from the standing groove 110 of the inside of the drill collar of reception antenna, put
Putting groove 110 also has the cover plate of protection its internal circuit.
Front end matching receiving module 70 is mainly used in receiving electromagnetic wave signal, and the signal to receiving is amplified and passed
Signal synthesis before defeated.Front end matching receiving module 70 includes antenna matching unit 71, front end amplifying unit 72 and signal and closed
Into unit (the first inductance 76, the first electric capacity 77 and coaxial cable 80).
Specifically, as illustrated, the both ends of reception antenna 30 are connected to the input of antenna matching unit 71, antenna match
The output end of unit 71 is connected to the input of front end amplifying unit 72.Wherein, antenna matching unit 71 is generally resonance matching
Receiving circuit, for adjusting the receives frequency of antenna matching unit 71 according to the frequency of electromagnetic wave signal, antenna is matched,
Antenna is enabled to obtain optimal performance under the electromagnetic wave signal frequency of reception.Front end amplifying unit 72 is generally low noise fortune
Unit is put, the electromagnetic wave signal for being exported to antenna matching unit 71 carries out low noise amplification.
Signal synthesis unit includes the first inductance 76, the first electric capacity 77 and coaxial cable 80, the connection between each element
Relation is that the output end 74 of front end amplifying unit 72 is connected with one end of the first electric capacity 77, the power supply of front end amplifying unit 72
End 73 is connected with one end of the first inductance 76.The other end of first electric capacity 77 is connected with the other end of the first inductance 76, and with
The Inner cores 81 of coaxial cable 80 connect, the transmission for power supply signal and the composite signal of Electromagnetic Wave Detection signal.Coaxial cable
80 outer shield line 82 is connected as signal ground with the earth terminal 75 of front end amplifying unit 72.
Reception antenna 30 receives the electromagnetic wave signal transmitted by stratum, is obtained 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 transmit via coaxial cable 80, and pass through the first electric capacity 77 and
Annexation between one inductance 76 and the first electric capacity 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 the first electric capacity 77 then prevents direct current signal, therefore coaxial electrical
The power end 73 that the DC feedback signal of cable can directly connect front end amplifying unit 72 is powered to it, and by front end amplifying unit
The electromagnetic wave signal of the exchange of 72 outputs is kept off beyond power end 73, and power supply will not be had an impact.On the other hand, the first electric capacity
77 directly can prevent direct current signal by AC signal, therefore the DC feedback signal of coaxial cable will not connect front end amplification
The output end 74 of unit 72, the power supply signal of direct current is kept off beyond output end 74, and what the process of the output end 74 was exaggerated
Electromagnetic wave signal can directly connect the Inner cores of coaxial cable 80.The inductance of the capacitance of first electric capacity 77 and the first inductance 76
Value, the frequency for the electromagnetic wave signal that can be exported according to front end amplifying unit 72 are suitably chosen.
In the prior art, the signal that antenna receives is very faint in itself, is passing through very long cable, inevitable signal meeting
Further decay, but noise source is many, will not be decayed, and then signal to noise ratio can further be deteriorated.And the present invention is implemented
The front end matching receiving module 70 of example, local put is carried out to the electromagnetic wave signal received there is provided a front end amplifying unit 72
Greatly, and using coaxial cable 80 power supply and the transmission of electromagnetic wave signal are completed simultaneously, so by the signal of amplification, even if through
The transmission of the coaxial cable of long-distance, its signal to noise ratio is also smaller by being influenceed, and ensure that the quality of electromagnetic wave signal.Together
When, subsequent conditioning circuit is arranged on circuit storehouse farther out, the mechanical strength of drill collar had both been ensure that, and had not also increased processing cost.
In other embodiments of the invention, also set between the first inductance 76 and the power end 73 of front end amplifying unit 72
Voltage regulation unit (not shown) is equipped with, voltage regulation unit is used to adjust the power supply signal being sent to from coaxial cable 80.
Remote processor module 100 is mainly used in the subsequent treatment to the electromagnetic wave signal of reception, due to the embodiment of the present invention
In employ 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 being powered to the front end matching receiving module 70 near line end is with being used for power supply signal and electromagnetic wave signal
The signal decomposition unit (the second electric capacity 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 source.It should be noted that in fig. 2, with the table of functional block 103
What is shown is comprising the aftertreatment systems including power supply unit.The filtering to signal can be included to the subsequent treatment of signal, turned
Change, using the signal of change formation resistivity that receives or obtain the one of transmission signal etc..
Signal decomposition unit includes the second electric capacity 101, the second inductance 102 and coaxial cable 80, the company between each element
The relation of connecing is that one end of the second electric capacity 101 is connected with one end of the second inductance 102, and is connected to the Inner cores 81 of coaxial cable 80.
The outer shield line 82 of coaxial cable 80 is connected with the earth terminal 106 comprising the aftertreatment systems 103 including power supply unit.
The other end of second electric capacity 101 is connected with the input 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 needs to feed by the forward end of coaxial cable 80 matching receiving module 70, and second
Inductance 102 directly can prevent AC signal by direct current signal, and the second electric capacity 101 then prevents direct current signal, therefore power
The Inner cores that the DC power signal of unit output can directly connect coaxial cable 80 provide direct current for front end amplifying unit 72
Source, and the second electric capacity 101 can prevent direct current signal, therefore DC power signal can be kept off to the input in aftertreatment systems
Beyond end 105, i.e., the DC power signal will not have an impact to the receiving terminal 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 electric capacity 101 directly can be believed by exchanging
Number, simultaneously because the effect of the second inductance 102, can keep off the electromagnetic wave signal of the exchange of reception the electricity in aftertreatment systems
Beyond source 104, power supply unit will not be had an impact.
In an embodiment of the present invention, due to subsequent process circuit receive electromagnetic wave signal be by being exaggerated signal,
Therefore it can ensure that decay occurs in transmitting procedure even if signal also maintains certain signal intensity, simultaneously effective improves
The signal to noise ratio of the signal received.
Apply the present invention to, with the measurement for boring electromagnetic resistivity, be beneficial to improve measurement accuracy.Such as it is applied to
Nearly drill bit radio magnetic wave transmission, it 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 reception antenna according to second embodiment of the invention
Figure, the difference below for itself and first embodiment illustrate.
If fixed in the measurement of electromagnetic resistivity use a specific frequency (such as conventional 2MHz letter
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 of the first inductance 76 3rd electric capacity 78 in parallel,
In place branch road the 3rd inductance 79 of series connection of the first electric capacity 77.Further, first embodiment signal decomposition unit basis
On, connected the 4th inductance 108 in the place branch road of the second electric capacity 101, in the both ends of the second inductance 102 the 4th electric capacity 107 in parallel.
When the used frequency with brill electromagnetic wave is f=2MHz, if the capacitance for taking all electric capacity is C=
6.33nF, the inductance value for taking all inductance are that L=1uF, then capacitance and inductance value meet following relational expression：
As can be seen that the now shunt circuit of the first inductance 76 and the 3rd electric capacity 78, and the second inductance 102 and the 4th electricity
In 2MHz frequency 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, equivalent to being directly disconnected, reach for 2MHz for the isolation effect of 2MHz AC signal
It is best.The series arm of first electric capacity 77 and the 3rd inductance 79 simultaneously, and the second electric capacity 101 and the 4th inductance 108 are connected
In 2MHz frequency series resonance occurs for branch road, that is to say, that at this moment equivalent resistance is infinitesimal for 2MHz, that is, is gone here and there
Join branch road for 2MHz equivalent to direct short-circuit, reach best for the turn-on effect of 2MHz AC signal.
In the present embodiment, it is powered the conjunction of signal and electromagnetic wave signal by using series resonance and parallel resonance
Into with decomposition, the conllinear transmission of signal can be effectively realized.
Further, be generally operational in due to measurement while-drilling instrument in the environment of condition very severe, for example, by it is shallow enter
In deep drilling process, its operating ambient temperature can be from 30 DEG C to more than 175 DEG C.Therefore the device such as the inductance to using, electric capacity
Performance requirement it is very high.And the serial selection of inductance value size series, the capacitance size of electric capacity of high performance inductance is limited.
Therefore the present invention other embodiments in, using more capacitor combinations as shown in figures 4 a and 4b and more inductor combinations come
Realize, 6.33nF electric capacity is realized using 6nF, 0.3nF and 0.03nF three electric capacity parallel connections, and with three electricity in parallel
Hold the electric capacity replaced respectively in shunt-resonant circuit and series resonance branch road.
3rd embodiment：
In Practical Project, also difference can be realized using the electromagnetic wave signal of two kinds of frequencies simultaneously with electromagnetic resistivity is bored
The resistivity measurement of characteristic, such as generally use 2MHz and 400KHz are as signal frequency.Therefore, the 3rd in the present invention implements
In example, a kind of resonance circuit for being used to transmit 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.
Electric capacity and the part of inductance in parallel and series connection in Fig. 3 are replaced with Fig. 5 a and Fig. 5 b circuit respectively.Wherein, such as
Shown in Fig. 5 a, on the basis of the shunt circuit of the first inductance 76 and the 3rd electric capacity 78 one again in parallel by electric capacity and inductive bank
Into series arm, the shunt circuit can realize the parallel resonance of two frequency signals, you can to realize two frequencies simultaneously
Equivalent resistance on point is infinitely great.As shown in Figure 5 b, one is added in the series arm of the first electric capacity 77 and the 3rd inductance 79
The individual shunt circuit being made up of inductance and electric capacity, the series arm can realize the series resonance of two frequency signals, you can with
Realize that the equivalent resistance on two Frequency points is infinitely small simultaneously.Therefore the circuit in the present embodiment can realize simultaneously 2MHz and
400KHz equivalent resistance is infinitely great and infinitely small, while meets being effectively isolated and effectively passing through for 2MHz and 400KHz.
It should be noted that Fig. 5 only give in signal synthesis unit be used for transmit the humorous of double frequency electromagnetic wave signal
Shake circuit, and for the form for the unit of signal decomposition being arranged in remote processor module, those skilled in the art can lead to
Cross understanding and be arranged in correspondence with its structure.In addition, above-mentioned signal synthesis and the detailed process and the parameter of electric capacity 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 reception antenna
The signal receiving performance of system, that is, improve the signal to noise ratio of signal and corresponding sensitivity.Exist using the device of the embodiment of the present invention
With boring among electromagnetic resistivity measuring instrument, measurement accuracy or measurement range can be greatly improved, is further geology
It is oriented to and more efficient data supporting is provided.The application of nearly drill bit wireless data transmission instrument receives limitation, particularly exists
In low-resistance stratum or water-base drilling fluid, electromagnetic wave signal decay 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 be effectively improved
The adaptability of transmission, it may apply in low-resistance stratum or water-base drilling fluid.
Although disclosed herein embodiment as above, described content only to facilitate understand the present invention and adopt
Embodiment, it is not limited to the present invention.Any those skilled in the art to which this invention pertains, this is not being departed from
On 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 the scope of patent protection of the present invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. it is a kind of with the matching reception device for boring electromagnetic wave reception antenna, including：
Front end matches receiving module, on the outer surface for the drill collar for being arranged on reception antenna end, for receive electromagnetic wave signal and
The electromagnetic wave signal is amplified and the synthesis before transmission；
Remote processor module, the inside of the drill collar of reception antenna is arranged far from, receiving the front end by coaxial cable matches
The output signal of receiving module, the output signal is decomposed, while match receiving module for the front end and power supply is provided
Signal.
2. device according to claim 1, it is characterised in that the front end matching receiving module includes：
Antenna matching unit, adjustment receives frequency make reception antenna match with electromagnetic wave signal；
Front end amplifying unit, it is connected with the antenna matching unit, for the electromagnetic wave letter received to antenna matching unit
Number carry out low noise amplification；
Signal synthesis unit, it is connected with the front end amplifying unit, for by electromagnetic wave signal and the front end amplifying unit
Power supply signal synthesized and be transmitted via coaxial cable.
3. device according to claim 2, it is characterised in that the remote processor module includes：
Power supply unit, dc source is provided for the front end amplifying unit；
Signal decomposition unit, for being decomposed to the signal received by coaxial cable.
4. device according to claim 3, it is characterised in that the signal synthesis unit includes the first electric capacity, the first electricity
Sense and coaxial cable,
One end of first electric capacity is connected with the output end of the front end amplifying unit, its 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；
First electric capacity is connected with the tie point of the first inductance with the Inner cores of the coaxial cable；
The outer shield line of the coaxial cable is connected with the earth terminal of the front end amplifying unit.
5. device according to claim 4, it is characterised 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, its other end and the one of second electric capacity
End is connected；
The other end of second electric capacity is used to connect subsequent process circuit to provide it electromagnetic wave signal；
Second inductance is connected with the tie point of the second electric capacity with the Inner cores of the coaxial cable；
The outer shield line of the coaxial cable is connected with the earth terminal of subsequent process circuit.
6. device according to claim 3, it is characterised in that the signal synthesis unit includes the first electric capacity, the first electricity
Sense, the 3rd electric capacity, the 3rd inductance and coaxial cable,
First electric capacity is connected with the 3rd inductance, one end of series arm and the output end phase of the front end amplifying unit
Connection, its other end are connected with first inductance with one end of the shunt circuit of the 3rd electric capacity；
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 cores of the coaxial cable；
The outer shield line of the coaxial cable is connected with the earth terminal of the front end amplifying unit.
7. device according to claim 6, it is characterised in that the signal decomposition unit includes the second inductance, the second electricity
Appearance, the 4th inductance, the 4th electric capacity and coaxial cable,
Second inductance is in parallel with the 4th electric capacity, and one end of shunt circuit is connected with the output end of said supply unit
Connect, its other end is connected with second electric capacity with one end of the series arm of the 4th inductance；
The other end of the series arm is used to connect subsequent process circuit to provide it electromagnetic wave signal；
The shunt circuit is connected with the tie point of series arm with the Inner cores of the coaxial cable；
The outer shield line of the coaxial cable is connected with the earth terminal of subsequent process circuit.
8. device according to claim 7, it is characterised in that according to following expression determine the signal synthesis unit with
Inductance value and capacitance in signal decomposition unit：
<mrow>
<msup>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mi>f</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>L</mi>
<mi>C</mi>
</mrow>
</mfrac>
</mrow>
Wherein, f is with the frequency for boring electromagnetic wave, and L is the inductance of the signal synthesis unit and each inductance in signal decomposition unit
Value, C are the capacitance of the signal synthesis unit and each electric capacity in signal decomposition unit.
9. device according to claim 3, it is characterised in that the signal synthesis unit includes the first electric capacity, the first electricity
Sense, the 3rd electric capacity, the 3rd inductance, the 5th electric capacity, the 5th inductance, the 7th electric capacity, the 7th inductance and coaxial cable,
First electric capacity, the 3rd inductance are connected with the shunt circuit being made up of the 7th electric capacity and the 7th inductance, series connection branch
The one end on road is connected with the output end of the front end amplifying unit, its other end and first inductance, the 3rd electric capacity and bag
The one end for the shunt circuit that series arm containing the 5th electric capacity and the 5th inductance is formed and the Inner core phases of the coaxial cable
Connection, it should be put comprising the other end of the shunt circuit of the first inductance, the 3rd electric capacity, the 5th electric capacity 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 earth terminal of the front end amplifying unit.
10. device according to claim 9, it is characterised in that the signal decomposition unit includes the second inductance, the second electricity
Appearance, the 4th inductance, the 4th electric capacity, the 6th inductance, the 6th electric capacity, the 8th inductance, the 8th electric capacity and coaxial cable,
Second inductance, the 4th electric capacity are in parallel with the series arm being made up of the 6th inductance and the 6th electric capacity, and parallel connection is returned
The one end on road is connected with the output end of said supply unit, and its other end and second electric capacity, the 4th inductance are with including the
One end of series arm and the Inner cores of the coaxial cable that the shunt circuit of eight electric capacity and the 8th inductance is formed are connected,
The other end of the series arm for including the second electric capacity, the 4th inductance, the 8th electric capacity and the 8th inductance is used to connect subsequent treatment
Circuit is to provide it electromagnetic wave signal；
The outer shield line of the coaxial cable is connected with the earth terminal with subsequent process circuit.
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| CN107453020B (en) | 2019-10-29 |
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