CN108612523B - A kind of bi-directional electromagnetic measurement while drilling control method and system based on aerial array - Google Patents
A kind of bi-directional electromagnetic measurement while drilling control method and system based on aerial array Download PDFInfo
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- CN108612523B CN108612523B CN201810469383.5A CN201810469383A CN108612523B CN 108612523 B CN108612523 B CN 108612523B CN 201810469383 A CN201810469383 A CN 201810469383A CN 108612523 B CN108612523 B CN 108612523B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
Abstract
The present invention provides a kind of bi-directional electromagnetic measurement while drilling control method and system based on aerial array, the measurement control method passes through the aerial array that is formed by the n group grounding electrode frame centered on drilling rod, ground signal sending and receiving apparatus with phase detector, computer, one end is connected the n root copper conductor that the other end is connected one by one with n grounding electrode with drilling rod, underground signal sending and receiving apparatus and underground survey power supply pipe nipple are realized, during uploading in signal and pass down, pass through aerial array and phase detector, eliminate each grounding electrode in ground-plane antenna battle array receive interfering with each other between signal and underground signal reception device phase difference between received multiple groups aerial signal.The present invention improves the emissive porwer and receiving sensitivity of signal, and then effectively improve bi-directional electromagnetic wave measurement while drilling signal transmission distance by using aerial array in electromagnetic measurement while drilling system.
Description
Technical field
The present invention relates to electromagnetic measurement while drilling field more particularly to a kind of bi-directional electromagnetic measurement while drillings based on aerial array
Control method and system.
Background technique
Electromagnetic measurement while drilling (EM-MWD) is a new technology for entering industrial applications the 1980s, is situated between by mud
Matter influence is small, can be not only used for mud drilling, and can be used for foam, air drilling.It is surveyed relative to unidirectional electromagnetism with brill
The signal transmission power and frequency of downhole instrument is adjusted in amount, bi-directional electromagnetic measurement-while-drilling system, enhances instrument to complicated resistance
The adaptability on rate stratum；Can also according to underground working and measurement demand, control underground transmitting module whether suspend mode, to save electricity
Can, extend the instrument underground work time.In two-way EM-MWD system, up-delivering signal is in shaft bottom by drill string by insulating short section
Two sections are divided into, emits the two poles of the earth respectively as signal, constitutes asymmetric dipole energisation mode, the acquisition of ground signal reception device is bored
Potential difference between column and grounding electrode and the signal through processing acquisition underground upload.Lower communication number is by drill string and ground connection
Apply driving source transmitting between emission electrode, underground signal receiving end acquires the potential difference of insulating short section both ends drill string and through handling
Obtain the director data that subsurface passes.And during practical logging, signal decaying is tight when being transmitted in the earth formation due to electromagnetic wave
Weight, when reaching certain depth, will be difficult to detect effective electromagnetic wave signal on ground or underground.To find out its cause, mainly
Since ground launch and reception device are usually only made of a transmitting or receiving antenna, signal drill string and a grounding electrode
Emissive porwer and receiving sensitivity are far away from antenna array.And antenna array emits in receive process in signal, due to spatial position
The heterogeneity on Non-completety symmetry and stratum, mutiple antennas transmitting or received signal will form certain phase difference, make
At interfering with each other for signal, it is unfavorable for the bi-directional electromagnetic wave measurement while drilling operation in compared with deep well borehole.
Summary of the invention
The present invention is inadequate for the reception of existing electromagnetic measurement while drilling technology and transmitting signal strength, and transmission range is inadequate
Far, excessive disadvantage is interfered between signal, propose a kind of bi-directional electromagnetic measurement while drilling control method based on aerial array and
System, aerial array that the measurement control method is formed by the n group grounding electrode frame centered on drilling rod, with phase detection
The ground signal sending and receiving apparatus of device, computer, one end are connected the n that the other end is connected one by one with n grounding electrode with drilling rod
Root copper conductor, underground signal sending and receiving apparatus and underground survey power supply pipe nipple realize, measurement method the following steps are included:
S1, underground survey power supply pipe nipple measurement underground geologic parameter, drilling parameter and bore parameters and by the underground
Matter parameter, drilling parameter and bore parameters are transmitted to underground signal sending and receiving apparatus；
S2, underground signal sending and receiving apparatus distinguish the physical quantity of the geologic parameter, drilling parameter and bore parameters
It is converted to digital signal and the digital signal is encoded, is compressed, launch by carrier of low-frequency electromagnetic wave；
S3, n group grounding electrode acquire the signal of underground signal sending and receiving apparatus transmitting respectively, obtain n group signal, transmitting
To ground signal sending and receiving apparatus；
S4, ground signal sending and receiving apparatus by the n group signal carry out respectively signal amplification, analog-to-digital conversion, filtering and
Demodulation process；
Phase detector in S5, ground signal sending and receiving apparatus is conciliate to described by amplification, analog-to-digital conversion, filtering
Adjust that treated that n group signal is handled: on the basis of No. 1 electrode, No. 2, No. 3 ..., n electrode and No. 1 electrode gained letter
Number phase difference be respectivelyN group signal is carried out according to calculated phase difference
Signal after synchronizing is overlapped processing and reinforced signal, obtains the signal data of underground upload, finally by Phase synchronization
It is shown and is handled on computers.
Further, in a kind of bi-directional electromagnetic measurement while drilling method based on aerial array of the invention, the ground connection
Electrode length is 0.1-10m, and upper end is cylindric, diameter 5-100mm, and lower end sharpening, sharpening partial-length is 1-5cm, institute
The material of grounding electrode is stated using any one of copper, 304 stainless steels, aluminium alloy, resistivity is less than 10-4Ω·m；The ground connection
Electrode is inserted perpendicularly into ground, insertion depth 0.05-10m when being arranged, the spacing between grounding electrode and drilling rod is 10-200m,
Spacing between grounding electrode is greater than 5m, and grounding electrode quantity is 2-50；The phase detector selection AD640, AD641,
Any one of AD8302, AD8307, AD8310；Copper conductor diameter used is 1-50mm, and resistivity is less than 10-6Ω·m。
The present invention also provides a kind of based on the bi-directional electromagnetic of aerial array with control method is bored, and includes the following steps:
S11, underground signal sending and receiving apparatus transmitter phase difference test signal, and n group grounding electrode respectively surveys phase difference
Trial signal is acquired, and is obtained n group phase difference test signal and is transmitted to ground signal sending and receiving apparatus；
Phase detector in S12, ground signal sending and receiving apparatus obtains and analyzes the n group phase difference test letter
Number, on the basis of No. 1 electrode, No. 2, No. 3 ..., the phase difference of signal obtained by n electrode and No. 1 electrode be respectively Obtain the phase difference of n group phase difference test signal；
S13, the response n group phase difference test signal, and computer is needed to send by ground signal sending and receiving apparatus
Command signal encoded, compression processing, allows n electrode in numerical order simultaneously with 0, Phase using low-frequency electromagnetic wave as carrier carry out signal transmitting；
S14, underground signal sending and receiving apparatus acquire the n group signal and are overlapped, and put to superimposed signal
Greatly, analog-to-digital conversion, filtering and demodulation process obtain the command signal that computer issues.
The present invention also provides a kind of bi-directional electromagnetic measurement-while-drilling system based on aerial array, by centered on drilling rod
Aerial array, the ground signal sending and receiving apparatus with phase detector, computer, one end of n group grounding electrode frame formation
N root copper conductor, underground signal sending and receiving apparatus and the underground that the other end that is connected with drilling rod is connected one by one with n grounding electrode are surveyed
Power supply pipe nipple is measured to realize, is comprised the following modules:
Parameter measurement transfer module, for making underground survey power supply pipe nipple measurement underground geologic parameter, drilling parameter and well
The underground geologic parameter, drilling parameter and bore parameters are simultaneously transmitted to underground signal sending and receiving apparatus by eye parameter；
Signal switching emission module, for make underground signal sending and receiving apparatus by the geologic parameter, drilling parameter and
The physical quantity of bore parameters is respectively converted into digital signal and encodes the digital signal, compresses, with low-frequency electromagnetic wave
Launch for carrier；
Signal acquisition module, for making n group grounding electrode acquire the signal of underground signal sending and receiving apparatus transmitting respectively,
N group signal is obtained, ground signal sending and receiving apparatus is transmitted to；
Signal processing module, for make ground signal sending and receiving apparatus by the n group signal carry out respectively signal amplification,
Analog-to-digital conversion, filtering and demodulation process；
Signal phase synchronizes laminating module, for making the phase detector in ground signal sending and receiving apparatus to the warp
N group signal after crossing amplification, analog-to-digital conversion, filtering and demodulation process is handled: on the basis of No. 1 electrode, No. 2,3
Number ..., the phase difference of signal obtained by n electrode and No. 1 electrode be respectivelyRoot
Phase synchronization is carried out to n group signal according to calculated phase difference, the signal after synchronizing is overlapped processing, signal is added
By force, the signal data for obtaining underground upload, is finally shown and is handled on computers.
The present invention also provides a kind of based on the bi-directional electromagnetic of aerial array with control system is bored, and comprises the following modules:
Phase difference tests signal emission module, for making underground signal sending and receiving apparatus transmitter phase difference test signal, n
Group grounding electrode is respectively acquired phase difference test signal, obtains n group phase difference test signal and is transmitted to ground signal
Sending and receiving apparatus；
Phase difference tests signal phase difference and obtains module, for making the phase detector in ground signal sending and receiving apparatus
Obtain and analyze n group phase difference test signal, on the basis of No. 1 electrode, No. 2, No. 3 ..., n electrode and No. 1 electrode
The phase difference of gained signal is respectivelyTo obtain n group phase difference test signal
Phase difference 0,
Command signal handles transmitting module, the instruction for making ground signal sending and receiving apparatus need to send by computer
Signal encoded, compression processing, allow n electrode in numerical order simultaneously with 0,Phase using low-frequency electromagnetic wave as carrier transmitting coding, after compression processing
Computer instruction signal；
Command signal obtains module, is folded for making underground signal sending and receiving apparatus acquire the n group command signal
Add, superimposed signal is amplified, analog-to-digital conversion, filtering and demodulation process, obtain the command signal that computer issues.
It is low in cost the beneficial effects of the present invention are the method for offer is easy to operate, made centered on drilling rod on ground
It is erected a television antenna according to certain rules array system with multiple grounding electrodes, and adds phase inspection in ground signal sending and receiving apparatus
Wave device, it is easy to accomplish field application；Method provided by the invention is by using antenna array system and adds phase inspection
Traditional single antenna signal sending and receiving apparatus is improved to antenna array system and realizes transmitting and receive letter by the method for wave device
Number in-phase stacking, be applied to electromagnetic measurement while drilling in, improve the emissive porwer and receiving sensitivity of signal, and then effectively mention
High bi-directional electromagnetic wave measurement while drilling signal transmission distance can be enhanced ground receiver and emit the intensity of signal, to improve electricity
The transmission range of magnetic wave measurement while drilling signal.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is that signal of the embodiment of the present invention uploads flow chart；
Fig. 2 is to pass flow chart under signal of the embodiment of the present invention；
Fig. 3 is 1 electromagnetic measurement while drilling system schematic of the embodiment of the present invention；
Fig. 4 is 2 electromagnetic measurement while drilling system schematic of the embodiment of the present invention.
Figure label explanation: 1- computer；2- ground signal sending and receiving apparatus (inside has phase detector)；3- connects
Ground electrode；4- drilling rod；5- underground signal sending and receiving apparatus；6- measures power supply pipe nipple.
Specific embodiment
In order to which the technical features, objects and effects of invention are more clearly understood, now compare attached drawing and this is described in detail
The specific embodiment of invention.
Aerial array that the measurement control method is formed by the n group grounding electrode frame centered on drilling rod, with phase
The ground signal sending and receiving apparatus of wave detector, computer, one end other end that is connected with drilling rod are connected one by one with n grounding electrode
N root copper conductor, underground signal sending and receiving apparatus and underground survey power supply pipe nipple realize that measurement method includes following step
It is rapid:
S1, underground survey power supply pipe nipple measurement underground geologic parameter, drilling parameter and bore parameters and by the underground
Matter parameter, drilling parameter and bore parameters are transmitted to underground signal sending and receiving apparatus；
S2, underground signal sending and receiving apparatus distinguish the physical quantity of the geologic parameter, drilling parameter and bore parameters
It is converted to digital signal and the digital signal is encoded, is compressed, launch by carrier of low-frequency electromagnetic wave；
S3, n group grounding electrode acquire the signal of underground signal sending and receiving apparatus transmitting respectively, obtain n group signal, transmitting
To ground signal sending and receiving apparatus；
S4, ground signal sending and receiving apparatus by the n group signal carry out respectively signal amplification, analog-to-digital conversion, filtering and
Demodulation process；
Phase detector in S5, ground signal sending and receiving apparatus is conciliate to described by amplification, analog-to-digital conversion, filtering
Adjust that treated that n group signal is handled: on the basis of No. 1 electrode, No. 2, No. 3 ..., n electrode and No. 1 electrode gained letter
Number phase difference be respectivelyN group signal is carried out according to calculated phase difference
Signal after synchronizing is overlapped processing and reinforced signal, obtains the signal data of underground upload, finally by Phase synchronization
It is shown and is handled on computers.
Further, in a kind of bi-directional electromagnetic measurement while drilling method based on aerial array of the invention, the ground connection
Electrode length is 0.1-10m, and upper end is cylindric, diameter 5-100mm, and lower end sharpening, sharpening partial-length is 1-5cm, institute
The material of grounding electrode is stated using any one of copper, 304 stainless steels, aluminium alloy, resistivity is less than 10-4Ω·m；The ground connection
Electrode is inserted perpendicularly into ground, insertion depth 0.05-10m when being arranged, the spacing between grounding electrode and drilling rod is 10-200m,
Spacing between grounding electrode is greater than 5m, and grounding electrode quantity is 2-50；The phase detector selection AD640, AD641,
Any one of AD8302, AD8307, AD8310；Copper conductor diameter used is 1-50mm, and resistivity is less than 10-6Ω·m。
The present invention also provides a kind of based on the bi-directional electromagnetic of aerial array with control method is bored, and includes the following steps:
S11, underground signal sending and receiving apparatus transmitter phase difference test signal, and n group grounding electrode respectively surveys phase difference
Trial signal is acquired, and is obtained n group phase difference test signal and is transmitted to ground signal sending and receiving apparatus；
Phase detector in S12, ground signal sending and receiving apparatus obtains and analyzes the n group phase difference test letter
Number, on the basis of No. 1 electrode, No. 2, No. 3 ..., the phase difference of signal obtained by n electrode and No. 1 electrode be respectively Obtain the phase difference of n group phase difference test signal；
S13, the response n group phase difference test signal, and computer is needed to send by ground signal sending and receiving apparatus
Command signal encoded, compression processing, allows n electrode in numerical order simultaneously with 0, Phase using low-frequency electromagnetic wave as carrier carry out signal transmitting；
S14, underground signal sending and receiving apparatus acquire the n group signal and are overlapped, and put to superimposed signal
Greatly, analog-to-digital conversion, filtering and demodulation process obtain the command signal that computer issues.
Embodiment 1: referring to Fig. 3, a kind of bi-directional electromagnetic measurement while drilling method and system based on aerial array of the invention,
Wherein grounding electrode number is 2 in antenna array system, and operating procedure is as follows:
(1), erected a television antenna array system centered on drilling rod 4 using 2 grounding electrodes 3 on ground.Single grounding electrode 3
Length is 0.5m, and upper end is cylindric, diameter 10mm, and lower end sharpening, sharpening partial-length is 2cm, and material is all made of 304 not
Become rusty steel.Require to be inserted perpendicularly into ground when grounding electrode 3 is arranged, depth 0.5m, 3 quantity of grounding electrode is 2,2 piece-root graftings it is electric
The distance between pole 3 and drilling rod 4 are 50m, and the spacing between 2 piece-root grafting ground electrodes 3 is 100m, and 2 piece-root grafting ground electrodes 3 are numbered successively
For No. 1 and No. 2.
(2), there is AD8302 phase detector in ground signal sending and receiving apparatus 2, and with 2 copper conductor one end and
Drilling rod 4 is connected, and one end and 2 grounding electrodes 3 of setting are respectively connected with, and it is 2mm that copper conductor used, which requires diameter,.
(3), in two-way EM-MWD system signal upload procedure, underground geology is measured by underground survey power supply pipe nipple 6 first
Then corresponding geologic parameter, drilling parameter and bore parameters physical quantity are transferred to well by parameter, drilling parameter and bore parameters etc.
Lower signal sending and receiving apparatus 5 is converted to digital signal, and relevant digital signal is after encoding, compressing etc. science and engineering and make, most
Launch afterwards by carrier of low-frequency electromagnetic wave.Grounding electrode receives signal respectively, and ground signal sending and receiving apparatus 2 will be grounded
After 2 groups of signals of electrode acquisition carry out amplification, analog-to-digital conversion, filtering and demodulation of signal etc. reason respectively, phase detection is transferred to
Device is handled, and on the basis of No. 1 grounding electrode 3, the phase difference of No. 23 gained signals of grounding electrode 3 and No. 1 grounding electrode isPhase synchronization is carried out to 2 groups of signals according to calculated phase difference, the signal after synchronizing is overlapped processing to signal
Reinforced, obtains the signal data of underground upload, finally shown and handled on computer 1.
(4) during, biography under two-way EM-MWD system signal, first by 5 transmitter phase of underground signal sending and receiving apparatus
Difference test signal, aerial array transfers to phase detector to be handled after collecting phase difference test signal, with No. 1 grounding electrode
On the basis of, the phase difference of No. 2 grounding electrodes and signal obtained by No. 1 grounding electrode isThen ground signal transmitting connects
Computer is needed the control instruction data that send to be encoded, compressed etc. after science and engineering makees by receiving apparatus, finally allows 2 ground connection electric
Pole 3 in numerical order simultaneously with 0,Phase using low-frequency electromagnetic wave as carrier carry out signal transmitting, underground signal transmitting
5 acquisition control signal of reception device simultaneously obtains the control that computer passes down after amplification, analog-to-digital conversion, filtering and demodulation etc. reason
Instruction.
Embodiment 2: referring to fig. 4, a kind of bi-directional electromagnetic measurement while drilling method based on aerial array of the invention, wherein day
Grounding electrode number is 3 in line-array systems, and operating procedure is as follows:
(1), erected a television antenna array system centered on drilling rod 4 using 3 grounding electrodes 3 on ground.Single grounding electrode 3
Length is 1m, and upper end is cylindric, diameter 15mm, and lower end sharpening, sharpening partial-length is 3cm, and material uses red copper.Ground connection
It requires to be inserted perpendicularly into ground, depth 1m when electrode 3 is arranged, 3 quantity of grounding electrode is 3, and 3 piece-root grafting ground electrodes 3 are with drilling rod 4
Center arrangement in equilateral triangle, the distance between 3 piece-root grafting ground electrodes 3 and drilling rod 4 are 100m, between 3 piece-root grafting ground electrodes 3
Spacing is 173m, and 3 piece-root grafting ground electrodes 3 number is followed successively by No. 1, No. 2 and No. 3.
(2), there is in ground signal sending and receiving apparatus 2 AD8310 phase detector, and with 3 copper conductor one end and bore
Bar 4 is connected, and one end and 3 grounding electrodes 3 of setting are respectively connected with, and it is 5mm that copper conductor used, which requires diameter,.
(3), in two-way EM-MWD system signal upload procedure, underground geology is measured by underground survey power supply pipe nipple 6 first
Then parameter, drilling parameter and bore parameters are transferred to corresponding underground geologic parameter, drilling parameter and bore parameters physical quantity
Underground signal sending and receiving apparatus 5 is converted to digital signal, relevant digital signal after encoding, compressing etc. science and engineering and make,
Finally launch by carrier of low-frequency electromagnetic wave.The antenna array receiver signal of grounding electrode composition, ground signal transmitting connect
After 3 groups of signals that receiving apparatus 2 acquires aerial array carry out amplification, analog-to-digital conversion, filtering and demodulation of signal etc. reason respectively,
Phase detector is transferred to be handled, on the basis of No. 1 grounding electrode 3, No. 2 grounding electrodes 3 and No. 3 grounding electrodes 3 and No. 1
The phase difference of 3 gained signal of grounding electrode is respectivelyWithObtaining the phase between each reception of grounding electrode 3 signal
After difference, ground signal sending and receiving apparatus carries out Phase synchronization to 3 groups of signals and Signal averaging is handled, and obtains the letter of underground upload
Number is finally shown and is handled on computer 1.
(4) during, biography under two-way EM-MWD system signal, emitted by underground signal sending and receiving apparatus 5 believe first
Number, aerial array transfers to phase detector to be handled after collecting signal, on the basis of No. 1 grounding electrode, No. 2 grounding electrodes
The phase difference of 3 and No. 33 gained signals of grounding electrode 3 and No. 1 grounding electrode isWithThen ground signal transmitting connects
The control instruction data that computer is sent are encoded, are compressed etc. after science and engineering makees by receiving apparatus, allow 3 grounding electrodes 3 by volume
Number sequence simultaneously with 0,Phase using low-frequency electromagnetic wave as carrier carry out signal transmitting, underground signal transmitting
Reception device 5 acquires 3 groups of signals and is overlapped, to superimposed signal through amplification, analog-to-digital conversion, filtering and demodulation etc.
The control instruction that computer passes down is obtained after reason.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (5)
1. a kind of bi-directional electromagnetic measurement while drilling method based on aerial array, by the n group grounding electrode frame shape centered on drilling rod
At aerial array, the ground signal sending and receiving apparatus with phase detector, computer, one end be connected the other end with drilling rod
N root copper conductor, underground signal sending and receiving apparatus and the underground survey power supply pipe nipple being connected one by one with n grounding electrode come real
It is existing, which comprises the following steps:
S1, underground survey power supply pipe nipple measurement underground geologic parameter, drilling parameter and bore parameters simultaneously join the underground geology
Number, drilling parameter and bore parameters are transmitted to underground signal sending and receiving apparatus；
S2, underground signal sending and receiving apparatus convert the physical quantity of the geologic parameter, drilling parameter and bore parameters respectively
It encoded, compressed for digital signal and by the digital signal, launched by carrier of low-frequency electromagnetic wave；
S3, n group grounding electrode acquire the signal of underground signal sending and receiving apparatus transmitting respectively, obtain n group signal, are transmitted to ground
Face signal sending and receiving apparatus；
The n group signal is carried out signal amplification, analog-to-digital conversion, filtering and demodulation by S4, ground signal sending and receiving apparatus respectively
Processing；
Phase detector in S5, ground signal sending and receiving apparatus is to after amplification, analog-to-digital conversion, filtering and demodulation process
N group signal handled: on the basis of No. 1 electrode, No. 2, No. 3 ..., the phase of signal obtained by n electrode and No. 1 electrode
Difference is respectivelyPhase synchronization is carried out to n group signal according to calculated phase difference,
Signal after synchronizing is overlapped processing to reinforce signal, the signal data of underground upload is obtained, finally in computer
On shown and handled.
2. a kind of bi-directional electromagnetic measurement while drilling method based on aerial array according to claim 1, which is characterized in that described
Grounding electrode length is 0.1-10m, and upper end is cylindric, diameter 5-100mm, and lower end sharpening, sharpening partial-length is 1-
The material of 5cm, the grounding electrode use any one of copper, 304 stainless steels, aluminium alloy, and resistivity is less than 10-4Ω·m；Institute
Ground, insertion depth 0.05-10m are inserted perpendicularly into when stating grounding electrode setting, the spacing between grounding electrode and drilling rod is 10-
200m, the spacing between grounding electrode are greater than 5m, and grounding electrode quantity is 2-50；The phase detector selection AD640,
Any one of AD641, AD8302, AD8307, AD8310；Copper conductor diameter used is 1-50mm, and resistivity is less than 10-6Ω·
m。
3. it is a kind of based on the bi-directional electromagnetic of aerial array with bore control method, which comprises the following steps:
S11, underground signal sending and receiving apparatus transmitter phase difference test signal, and n group grounding electrode, which respectively tests phase difference, to be believed
It number is acquired, obtains n group phase difference and test signal and be simultaneously transmitted to ground signal sending and receiving apparatus；
Phase detector in S12, ground signal sending and receiving apparatus obtains and analyzes the n group phase difference test signal, with 1
On the basis of number electrode, No. 2, No. 3 ..., the phase difference of signal obtained by n electrode and No. 1 electrode be respectively To obtain n group phase difference test signal phase difference 0,
Computer needs the command signal that sends to be encoded by S13, ground signal sending and receiving apparatus, compression processing, allows n
Electrode in numerical order simultaneously with 0,Phase with low-frequency electromagnetic wave be carry
Computer instruction signal after body transmitting coding, compression processing；
S14, underground signal sending and receiving apparatus acquire the n electrode while the computer instruction signal of transmitting is overlapped,
Superimposed signal is amplified, analog-to-digital conversion, filtering and demodulation process, obtains the command signal that computer issues.
4. a kind of bi-directional electromagnetic measurement-while-drilling system based on aerial array, by the n group grounding electrode frame shape centered on drilling rod
At aerial array, the ground signal sending and receiving apparatus with phase detector, computer, one end be connected the other end with drilling rod
N root copper conductor, underground signal sending and receiving apparatus and the underground survey power supply pipe nipple being connected one by one with n grounding electrode come real
It is existing, which is characterized in that comprise the following modules:
Parameter measurement transfer module, for making underground survey power supply pipe nipple measurement underground geologic parameter, drilling parameter and wellbore ginseng
The underground geologic parameter, drilling parameter and bore parameters are simultaneously transmitted to underground signal sending and receiving apparatus by number；
Signal switching emission module, for making underground signal sending and receiving apparatus by the geologic parameter, drilling parameter and wellbore
The physical quantity of parameter is respectively converted into digital signal and encodes the digital signal, compresses, and is to carry with low-frequency electromagnetic wave
Body is launched；
Signal acquisition module is obtained for making n group grounding electrode acquire the signal of underground signal sending and receiving apparatus transmitting respectively
N group signal, is transmitted to ground signal sending and receiving apparatus；
Signal processing module, for making ground signal sending and receiving apparatus that the n group signal is carried out signal amplification, modulus respectively
Conversion, filtering and demodulation process；
The synchronous laminating module of signal phase, for amplifying the phase detector in ground signal sending and receiving apparatus to process,
N group signal after analog-to-digital conversion, filtering and demodulation process is handled: on the basis of No. 1 electrode, No. 2, No. 3 ..., n electricity
Pole and the phase difference of signal obtained by No. 1 electrode are respectivelyAccording to calculated phase
Difference carries out Phase synchronization to n group signal, and the signal after synchronizing is overlapped processing and is reinforced signal, obtains underground upload
Signal data, finally shown and handled on computers.
5. it is a kind of based on the bi-directional electromagnetic of aerial array with bore control system, which is characterized in that comprise the following modules:
Phase difference tests signal emission module, and for making underground signal sending and receiving apparatus transmitter phase difference test signal, n group is connect
Ground electrode is respectively acquired phase difference test signal, obtains n group phase difference test signal and is transmitted to ground signal transmitting
Reception device；
Phase difference tests signal phase difference and obtains module, for obtaining the phase detector in ground signal sending and receiving apparatus
And analyze n group phase difference test signal, on the basis of No. 1 electrode, No. 2, No. 3 ..., n electrode and No. 1 electrode gained
The phase difference of signal is respectivelyTo obtain the phase of n group phase difference test signal
Potential difference 0,
Command signal handles transmitting module, the command signal for making ground signal sending and receiving apparatus need to send by computer
Encoded, compression processing, allow n electrode in numerical order simultaneously with 0,
Phase using low-frequency electromagnetic wave as carrier transmitting coding, the computer instruction signal after compression processing；
Command signal obtains module, for making underground signal sending and receiving apparatus acquire the calculating of the n electrode while transmitting
Machine command signal is overlapped, and is amplified, analog-to-digital conversion, filtering and demodulation process to superimposed signal, is obtained computer
The command signal issued.
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| CN110017134A (en) * | 2019-04-26 | 2019-07-16 | 中国地质大学（武汉） | A kind of forced electromagnetic measurement while drilling system and measurement method |
| CN113482605A (en) * | 2021-07-30 | 2021-10-08 | 中国地质大学（武汉） | Onshore drilling electromagnetic measurement-while-drilling signal transmission characteristic simulation experiment system and onshore drilling electromagnetic measurement-while-drilling signal transmission characteristic simulation experiment method |
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