CN103953327B - A kind of probe - Google Patents
A kind of probe Download PDFInfo
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- CN103953327B CN103953327B CN201410147949.4A CN201410147949A CN103953327B CN 103953327 B CN103953327 B CN 103953327B CN 201410147949 A CN201410147949 A CN 201410147949A CN 103953327 B CN103953327 B CN 103953327B
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Abstract
The invention discloses a kind of probe, at least include：Pumping signal sending module, for receiving the first control signal, sends pumping signal；Anneta module, for sending pumping signal, receives NMR signal；Receiver module, for receiving the second control signal and the 3rd control signal, sends the first isolation control signal and the second isolation control signal；Receive the 4th control signal, stop sending isolation control signal and acquisition controlling signal；Isolation control module, is used for making Anneta module and pre-amplifying module be off or conducting state, or makes pre-amplifying module be in short-circuit condition；Pre-amplifying module, for being amplified to NMR signal filtering；Acquisition module, for being filtered and sampling to the filtered signal of amplification；Sampled signal is carried out being saved in caching after phase sensitive detection；Sending module, for receiving echo data transmission order, the signal in caching is sent to communication control circuit device, sends the 4th control signal.
Description
Technical field
The present invention relates to NMR Logging Technology, espespecially a kind of probe.
Background technology
Existing NMR logging instrument is mostly using electric discharge road, digital signal acquiring process circuit and probe before isolation solely
Vertical separate mode, probe only includes the parallel circuit of coil and electric capacity；Nuclear magnetic resonance, NMR letter is detected under the control of circuit pipe nipple
Number, the NMR signal receiving of popping one's head under this mode needs electric discharge road before a very long segment distance gets to isolate
With digital signal acquisition processing circuit, and NMR signal decay beyond being transferred to 1m just very fast, thus causing instrument
Entirety is highly susceptible to the interference of outside noise, and signal to noise ratio declines, thus greatly reducing the precision detecting NMR signal.
Content of the invention
In order to solve the above problems, the present invention proposes a kind of probe, can dramatically increase the capacity of resisting disturbance of probe, from
And improve the precision detecting NMR signal.
In order to achieve the above object, the present invention proposes a kind of probe, at least includes：
Pumping signal sending module, for receiving the first control signal from circuit pipe nipple, sends excitation to antenna
Signal；
Anneta module, for sending the pumping signal of autoexcitation signal transmitting module to stratum, receives from stratum
NMR signal；
Receiver module, for receive from circuit pipe nipple the second control signal, to isolation control module send first every
From control signal；Receive the 3rd control signal from circuit pipe nipple, send for controlling acquisition module to isolation control module
Carry out the second isolation control signal of signal sampling；Receive the 4th control signal from sending module, stop to isolation control
Molding block sends isolation control signal, and stops sending acquisition controlling signal to acquisition module；
Isolation control module, for detecting the voltage of described Anneta module output or the electricity of pre-amplifying module input
Pressure is higher than predeterminated voltage, so that Anneta module and pre-amplifying module is off；Receive the first isolation control signal, make
Described pre-amplifying module is in short-circuit condition；Receive the second isolation control signal, make described Anneta module and preposition amplification
Module is in the conduction state；
Pre-amplifying module, for being amplified Filtering Processing to the NMR signal that antenna receives；
Acquisition module, for being filtered processing to the filtered signal of amplification, according to described acquisition controlling signal to place
Signal sampling after reason obtains sampled signal；Described sampled signal is carried out phase sensitive detection process, the signal after processing is preserved
To in caching；
Sending module, for receiving the echo data transmission order from communication control circuit device, by caching
Signal is sent to described communication control circuit device, sends the 4th control signal to described receiver module.
Preferably, receive 30 microseconds of described first control signal in described pumping signal sending module after, described connect
Receive module and receive described second control signal；After described receiver module receives 80 microseconds of described second control signal, connect
Receive described 3rd control signal.
Preferably, described receiver module, at least includes：
Second drive circuit, for described second control signal or described 3rd control signal or described 4th control
Signal is driven；
Coomand mode combiner circuit, for receiving the second control signal after driving, sends to described isolation control module
Described first isolation control signal；Receive the 3rd control signal after driving, send described second to described isolation control module
Isolation control signal；Receive the 4th control signal after driving, stop sending isolation control signal to isolation control module, and stop
Only send acquisition controlling signal to acquisition module；Send acquisition controlling signal to collection sequential export circuit；
Collection sequential export circuit, adopts for controlling described acquisition module to carry out signal according to described acquisition controlling signal
Sample.
Preferably, described isolation control module, at least includes：
First high-voltage detecting circuit, for the voltage attenuation that exports described Anneta module to the first low-voltage, judges
Described first low-voltage is higher than predetermined threshold value, exports high level to the first drive circuit；Otherwise export low level give described first
Drive circuit；
Second high-voltage detecting circuit, for the voltage attenuation that inputs described pre-amplifying module to the second low-voltage, sentences
Break and described second low-voltage higher than predetermined threshold value, export high level to the first drive circuit；Otherwise export low level to described
First drive circuit；
First drive circuit, for the high level receiving is converted into low level, drives according to the low level after conversion
Described reception switch is off；Or the low transition receiving is become high level, according to the high level after conversion
Drive described reception switch in the conduction state.
Preferably, described pre-amplifying module, specifically for：
Receive the described NMR signal from described Anneta module, nuclear-magnetism antenna being received using bandpass filtering
Resonance signal is filtered processing, and the signal after Filtering Processing is amplified process using differential amplifier circuit.
Compared with prior art, the present invention includes：Pumping signal sending module, for receiving from circuit pipe nipple
One control signal, sends pumping signal to antenna；Anneta module, for sending swashing of autoexcitation signal transmitting module to stratum
Encourage signal, receive the NMR signal from stratum；Receiver module, for receiving the second control letter from circuit pipe nipple
Number, send the first isolation control signal to isolation control module；Receive the 3rd control signal from circuit pipe nipple, to isolation control
Molding block sends for controlling acquisition module to carry out the second isolation control signal of signal sampling；Receive from sending module
4th control signal, stops sending isolation control signal to isolation control module, and stops sending acquisition controlling to acquisition module
Signal；Isolation control module, for detecting the voltage of described Anneta module output or the voltage of pre-amplifying module input
Higher than predeterminated voltage, Anneta module and pre-amplifying module is made to be off；Receive the first isolation control signal, make institute
State pre-amplifying module and be in short-circuit condition；Receive the second isolation control signal, make described Anneta module and preposition amplification mould
Block is in the conduction state；Pre-amplifying module, for being amplified Filtering Processing to the NMR signal that antenna receives；Adopt
Collection module, for being filtered processing to the filtered signal of amplification, according to described acquisition controlling signal to the signal after processing
Sampling obtains sampled signal；Described sampled signal is carried out phase sensitive detection process, the signal after processing is saved in caching；Send out
Send module, for receiving the echo data transmission order from communication control circuit device, the signal in caching is sent to
Described communication control circuit device, sends the 4th control signal to described receiver module.By the solution of the present invention, by excitation letter
Number sending module, isolation control module, pre-amplifying module and acquisition module are arranged in probe, decrease Anneta module and front
Put the transmission range between amplification module, acquisition module is positioned over the mould can export pre-amplifying module in probe simultaneously
Intend signal and be converted into digital signal nearby, it is to avoid the noise jamming introducing because of the long range propagation of analogue signal, thus carry
The high signal to noise ratio of signal, improves the precision detecting NMR signal.
Further, isolation control module has makes Anneta module and pre-amplifying module be off or turn on shape
State or make pre-amplifying module be in the function of short-circuit condition, thus effective protection pre-amplification circuit；And unlike existing every
Anneta module can only be controlled to be in transmission state and reception state by receiving and dispatching switching signal like that from control circuit, receive
After easily causing erroneous judgement to connect pre-amplification circuit when antenna sends pumping signal and burn when disturbing to outside noise
Continuous instrument.
Brief description
Below the accompanying drawing in the embodiment of the present invention is illustrated, the accompanying drawing in embodiment is for entering one to the present invention
Step understands, is used for explaining the present invention, does not constitute limiting the scope of the invention together with description.
Fig. 1 is the structure composition schematic diagram of the probe of the present invention；
Fig. 2 is the structure composition schematic diagram of the embodiment of probe of the present invention.
Specific embodiment
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings, not
Can be used for limiting the scope of the invention.
Referring to Fig. 1, the present invention proposes a kind of probe, at least includes：
Pumping signal sending module, for receiving the first control signal from circuit pipe nipple, sends excitation to antenna
Signal；
Anneta module, for sending the pumping signal of autoexcitation signal transmitting module to stratum, receives from stratum
NMR signal；
Receiver module, for receive from circuit pipe nipple the second control signal, to isolation control module send first every
From control signal；Receive the 3rd control signal from circuit pipe nipple, send for controlling acquisition module to isolation control module
Carry out the second isolation control signal of signal sampling；Receive the 4th control signal from sending module, stop to isolation control
Molding block sends isolation control signal, and stops sending acquisition controlling signal to acquisition module；
Isolation control module, for detecting the voltage of described Anneta module output or the electricity of pre-amplifying module input
Pressure is higher than predeterminated voltage, so that Anneta module and pre-amplifying module is off；Receive the first isolation control signal, make
Described pre-amplifying module is in short-circuit condition；Receive the second isolation control signal, make described Anneta module and preposition amplification
Module is in the conduction state；
Pre-amplifying module, for being amplified Filtering Processing to the NMR signal that antenna receives；
Acquisition module, for being filtered processing to the filtered signal of amplification, according to described acquisition controlling signal to place
Signal sampling after reason obtains sampled signal；Described sampled signal is carried out phase sensitive detection process, the signal after processing is preserved
To in caching；
Sending module, for receiving the echo data transmission order from communication control circuit device, by caching
Signal is sent to communication control circuit device, sends the 4th control signal to receiver module.
Wherein, circuit pipe nipple refer to detect NMR signal during independent of probe outside circuit part, its work(
Mainly the first control signal can be sent to pumping signal sending module, send the second control signal and the 3rd control to receiver module
Signal processed, it is the partial circuit in existing circuit pipe nipple.
Wherein, receive 30 microseconds of the first control signal in pumping signal sending module after, receiver module receives
Two control signals；After receiver module receives 80 microseconds of the second control signal, receive the 3rd control signal.
After pumping signal sending module receives the first control signal, through the time of TE/2, antenna just can receive
To the NMR signal from stratum, that is, now antenna is in reception state, and wherein, TE is that circuit pipe nipple is adjacent to be sent twice
Time interval between first control signal, the time that antenna receives NMR signal is exactly in two secondary circuit pipe nipples and sends out
Send the intermediate time of the time interval between the first control signal.In order to preferably collect complete NMR signal, one
As antenna can be placed in reception state after 110 microseconds after circuit pipe nipple sends the first control signal.
Wherein, referring to Fig. 2, described receiver module, at least include：
Second drive circuit, for described second control signal or described 3rd control signal or described 4th control
Signal is driven；
Coomand mode combiner circuit, for receiving the second control signal after driving, sends to described isolation control module
Described first isolation control signal；Receive the 3rd control signal after driving, send described second to described isolation control module
Isolation control signal；Receive the 4th control signal after driving, stop sending isolation control signal to isolation control module, and stop
Only send acquisition controlling signal to acquisition module；Send acquisition controlling signal to collection sequential export circuit；
Collection sequential export circuit, adopts for controlling described acquisition module to carry out signal according to described acquisition controlling signal
Sample.
Wherein it is possible to be pre-configured with sample frequency and sampling time in coomand mode combiner circuit in advance, then adopting
The sample time sends sample command to collection sequential export circuit, controls acquisition module to carry out signal by collection sequential export circuit and adopts
Sample.
Wherein, isolation control module at least includes：
First high-voltage test circuit, for the voltage attenuation that exports Anneta module to the first low-voltage, judges institute
Stating the first low-voltage is higher than predetermined threshold value, exports high level to the first drive circuit；Otherwise export low level to described first drive
Galvanic electricity road；
Second high-voltage detecting circuit, for the voltage attenuation that inputs described pre-amplifying module to the second low-voltage, sentences
Break and described second low-voltage higher than predetermined threshold value, export high level to the first drive circuit；Otherwise export low level to described
First drive circuit；
First drive circuit, for the high level receiving is converted into low level, drives according to the low level after conversion
Described reception switch is off；Or the low transition receiving is become high level, according to the high level after conversion
Drive described reception switch in the conduction state.
Wherein, receive the field effect transistor for Digital Signals for the switch（MOS, Mosfetmos）Switch, when the receipts receiving
Send out switching signal（As the RT_SW signal in Fig. 2）For being off-state during low level, when the transmitting-receiving switching signal receiving（As
RT_SW signal in Fig. 2）For being conducting state during high level.
Wherein, the soft MOS switch for Digital Signals for the switch of releasing, when the soft control signal of releasing receiving（As Fig. 2
In SoftDump signal）For being off-state during low level, when the soft control signal of releasing receiving（In Fig. 2
SoftDump signal）For being conducting state during high level.
Wherein, by the soft switch and receive switch to simultaneously turn on be in order to the remaining pumping signal on antenna is released of releasing
Fall.After remaining pumping signal is released completely, soft releasing is switched off, thus effectively conducting Anneta module and preposition amplification
Module.
Wherein, pre-amplifying module, specifically for：
Receive the NMR signal from antenna, carried out using the NMR signal that bandpass filtering receives to antenna
Filtering Processing, is amplified to the signal after Filtering Processing processing using differential amplifier circuit.
Pre-amplifying module is the bandpass filtering that NMR signal is carried out with 300kHz～1MHz.And acquisition module is right
The filtered signal of pre-amplifying module carries out the low-pass filtering of 1MHz again, thus improving the signal to noise ratio of signal.
Wherein, communication control circuit device is independently of the device outside probe, and sending module is only receiving number of echoes
According to the signal after ability transmission processe after transmission order to communication control circuit device, mistake when otherwise easily causing communication transfer
By mistake.Communication control circuit device is usually once to send echo data transmission life on circuit pipe nipple sends before pumping signal
Order.
It should be noted that embodiment described above is for only for ease of those skilled in the art understanding, and
It is not used in and limit the scope of the invention, on the premise of the inventive concept without departing from the present invention, those skilled in the art couple
The present invention made any obvious replacement and improve etc. all within protection scope of the present invention.
Claims (5)
1. a kind of probe is it is characterised in that at least include：
Pumping signal sending module, for receiving the first control signal from circuit pipe nipple, sends pumping signal to antenna；
Anneta module, for sending the pumping signal of autoexcitation signal transmitting module to stratum, receives the nuclear-magnetism from stratum
Resonance signal；
Receiver module, for receiving the second control signal from circuit pipe nipple, sends the first isolation control to isolation control module
Signal processed；Receive the 3rd control signal from circuit pipe nipple, send for controlling acquisition module to carry out to isolation control module
Second isolation control signal of signal sampling；Receive the 4th control signal from sending module, stop controlling mould to isolation
Block sends isolation control signal, and stops sending acquisition controlling signal to acquisition module；
Isolation control module, for detecting the voltage of described Anneta module output or the voltage height of pre-amplifying module input
In predeterminated voltage, Anneta module and pre-amplifying module is made to be off；Receive the first isolation control signal, make described
Pre-amplifying module is in short-circuit condition；Receive the second isolation control signal, make described Anneta module and pre-amplifying module
In the conduction state；
Described isolation control module, at least includes：
First high-voltage detecting circuit, for the voltage attenuation that exports described Anneta module to the first low-voltage, judges described
First low-voltage is higher than predetermined threshold value, exports high level to the first drive circuit；Otherwise export low level to described first driving
Circuit；
Second high-voltage detecting circuit, for the voltage attenuation that inputs described pre-amplifying module to the second low-voltage, judges
Described second low-voltage is higher than predetermined threshold value, exports high level to the first drive circuit；Otherwise export low level give described first
Drive circuit；
Pre-amplifying module, for being amplified Filtering Processing to the NMR signal that antenna receives；
Acquisition module, for amplify filtered signal be filtered process, according to described acquisition controlling signal to process after
Signal sampling obtain sampled signal；Described sampled signal is carried out phase sensitive detection process, the signal after processing is saved in slow
In depositing；
Sending module, for receiving the echo data transmission order from communication control circuit device, by the signal in caching
It is sent to described communication control circuit device, send the 4th control signal to described receiver module.
2. probe according to claim 1 is it is characterised in that receive described first in described pumping signal sending module
After 30 microseconds of control signal, described receiver module receives described second control signal；Described receiver module receives described
After 80 microseconds of the second control signal, receive described 3rd control signal.
3. probe according to claim 1, it is characterised in that described receiver module, at least includes：
Second drive circuit, for described second control signal or described 3rd control signal or described 4th control signal
It is driven；
Coomand mode combiner circuit, for receiving the second control signal after driving, sends described to described isolation control module
First isolation control signal；Receive the 3rd control signal after driving, send described second isolation to described isolation control module
Control signal；Receive drive after the 4th control signal, stop to isolation control module send isolation control signal, and stop to
Acquisition module sends acquisition controlling signal；Send acquisition controlling signal to collection sequential export circuit；
Collection sequential export circuit, for controlling described acquisition module to carry out signal sampling according to described acquisition controlling signal.
4. according to claim 1 probe it is characterised in that
First drive circuit, for the high level receiving is converted into low level, drives according to the low level after conversion and receives
Switch is off；Or the low transition receiving is become high level, according to the high level after conversion drives
Receive switch in the conduction state.
5. probe according to claim 1 is it is characterised in that described pre-amplifying module, specifically for：
Receive the described NMR signal from described Anneta module, nuclear magnetic resonance, NMR antenna being received using bandpass filtering
Signal is filtered processing, and the signal after Filtering Processing is amplified process using differential amplifier circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410147949.4A CN103953327B (en) | 2014-04-14 | 2014-04-14 | A kind of probe |
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|---|---|---|---|
| CN201410147949.4A CN103953327B (en) | 2014-04-14 | 2014-04-14 | A kind of probe |
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| CN103953327A CN103953327A (en) | 2014-07-30 |
| CN103953327B true CN103953327B (en) | 2017-03-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104453857B (en) * | 2014-11-02 | 2018-02-16 | 中国石油集团钻井工程技术研究院 | A kind of small hole deviation go into the well tiltedly and tool face azimuth dynamic measurement method and device |
| CN105676021B (en) * | 2015-12-30 | 2019-07-30 | 航天恒星科技有限公司 | A kind of measuring device and method of close distance radio frequency switching antenna |
| CN112526620B (en) * | 2020-11-26 | 2022-02-01 | 中国地质大学（北京） | Low signal-to-noise ratio nuclear magnetic resonance echo signal processing method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19844895C2 (en) * | 1998-09-30 | 2000-10-05 | Wilfried Hellmuth Bergmann | Probe head for an NMR spectrometer |
| CN201546719U (en) * | 2009-11-11 | 2010-08-11 | 中国海洋石油总公司 | Focusing nuclear magnetic resonance eccentric well-logging probe |
| CN101949868B (en) * | 2010-09-16 | 2013-08-07 | 厦门大学 | Data acquisition device of nuclear magnetic resonance spectrometer |
| CN202870319U (en) * | 2012-06-26 | 2013-04-10 | 中国海洋石油总公司 | Test system for nuclear magnetic resonance logger |
| CN102839965B (en) * | 2012-08-21 | 2015-08-26 | 中国海洋石油总公司 | A kind of signal processing apparatus for NMR (Nuclear Magnetic Resonance) logging instrument |
| CN203008887U (en) * | 2012-08-21 | 2013-06-19 | 中国海洋石油总公司 | Isolating and weak signal preprocessing circuit of two-dimensional nuclear magnetic resonance logger |
| CN202937247U (en) * | 2012-11-21 | 2013-05-15 | 中国海洋石油总公司 | Event control and signal acquisition circuit of nuclear magnetic resonance logging instrument |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |