CN106499389A - Electromagnetic tool send-receive clock synchronization system and method between a kind of well - Google Patents
Electromagnetic tool send-receive clock synchronization system and method between a kind of well Download PDFInfo
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- CN106499389A CN106499389A CN201610933049.1A CN201610933049A CN106499389A CN 106499389 A CN106499389 A CN 106499389A CN 201610933049 A CN201610933049 A CN 201610933049A CN 106499389 A CN106499389 A CN 106499389A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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Abstract
The invention discloses electromagnetic tool send-receive clock synchronization system and method between a kind of well, its system includes time service module, ground system, downhole system, remote short section and cable；Ground transceiver module is pre-processed to the standard time clock reference signal that time service module is provided, and after being amplified by drive module through cable transmission to down-hole Shaping Module；By the signal for receiving point two-way, leading up to down-hole drive module and being back to ground through cable carries out shaping to down-hole Shaping Module, according to shaping after signal and standard time clock reference signal measurement ground to down-hole transmission delay；Generate synchronised clock on the basis of the clock signal for receiving to down-hole transceiver module, down-hole transceiver module in another road；Delayed data is sent to down-hole transceiver module, the synchronised clock that down-hole transceiver module is exported according to delay calibration through cable by remote short section by ground transceiver module；The time synchronized between the transceiver module of down-hole is achieved, the clock synchronization of two nodes in the environment of being related to without reference signal and long-distance transmissions clock signal, is realized.
Description
Technical field
The invention belongs to electromagnetic logging technical field between well, when receiving and dispatching more particularly, to electromagnetic tool between a kind of well
Clock synchronization system and method.
Background technology
Between well, magnetography is logged well as a kind of new logging method, fundamentally improves the thin of horizontal detectability
Weak link, can carry out detection measurement in the horizontal and vertical directions, solve the imbalance of information between wellhole and well, so as to significantly
Improve the ability of description reservoir characteristics.
During well logging, down-hole transmitter module is placed in a bite well, areal receiver-array module is placed in another mouthful of well, transmitter module
Launch electromagnetic wave to stratum, received by reception system after earth-layer propagation, transmitting is led to ground with the data is activation for receiving
Cross the inverting to data, obtain the relevant information of formation resistivity distribution, so as to obtain can reflect between well the construction of oil reservoir and
Oil, the two dimension of gas and water distribution are to three-dimensional-electroded method.
Between well, electromagnetic tool reception signal is closely related with the phase difference of transmission signal and formation conductivity, in order to accurate
Well formation distribution of conductivity is calculated, is needed to ensure the accurate of phase difference measurement, and then it has to be ensured that transmitting-receiving is synchronous.
Content of the invention
Disadvantages described above or Improvement requirement for prior art, the invention provides when between a kind of well, electromagnetic tool is received and dispatched
Clock synchronization system and method, to realize that electromagnetic measurement down-hole transmitter module is synchronous with the transmitting-receiving of the clock of areal receiver-array module between well.
For achieving the above object, according to one aspect of the present invention, there is provided electromagnetic tool send-receive clock between a kind of well
Synchronization system, including time service module, ground system, downhole system, remote short section and cable；
Wherein, ground system includes ground transceiver module, ground drive module and ground Shaping Module；Downhole system includes
Down-hole transceiver module, down-hole drive module and down-hole Shaping Module；
Wherein, time service module is used for providing standard time clock reference signal for ground system, and cable is used for connecting ground system
It is powered with downhole system and to downhole system；Remote short section is used for the data communication for realizing ground system and downhole system,
Including the transmission that ground faces down-hole time delay, and the upload of down-hole transmitting data and receiving data；
Wherein, ground transceiver module is used for pre-processing the standard time clock reference signal that time service module is provided, to mark
The dutycycle of quasi- clock reference signal enters line broadening, and the clock signal and the standard for exporting according to ground Shaping Module
Clock reference signal contrast obtains ground signal to the transmission delay of down-hole；
Ground drive module is used for being driven above-mentioned pretreated clock signal amplification, obtains the first clock and amplifies
Signal；Ground Shaping Module is used for second clock amplification signal to the output of down-hole drive module, through cable transmission to be carried out
Shape correction；
Down-hole Shaping Module is used for amplifying signal to the first clock after through cable transmission carries out shaping；Down-hole drive module
For the clock signal that down-hole Shaping Module is exported is driven amplification, obtains second clock and amplify signal, and be sent to ground
Face Shaping Module；
Down-hole transceiver module is used for generating synchronised clock on the basis of the clock signal of down-hole Shaping Module output.
It is another aspect of this invention to provide that based on electromagnetic tool send-receive clock synchronization system between above-mentioned well, there is provided one
Electromagnetic tool send-receive clock synchronous method between well is planted, is comprised the steps：
(1) control ground system receive standard time clock reference signal so that ground system reach with time service module when
Clock synchronization；Wherein, standard time clock reference signal is provided by time service module；
(2) downhole system is sent to come to well by ground system after by above-mentioned standard clock reference signal drive amplification
Lower system time service；
(3) clock signal for receiving is carried out shaping by downhole system, and by shaping after signal be divided into two-way, will wherein
Ground system is fed back to after drive amplification again all the way, wherein another road is generated downhole system synchronised clock as benchmark；
(4) ground is obtained to down-hole by comparing standard time clock with the clock signal of downhole system feedback by ground system
Transmission delay；
(5) downhole system synchronised clock is calibrated according to above-mentioned transmission delay by downhole system, realizes the transmitting-receiving of downhole system
Synchronous.
Preferably, electromagnetic tool send-receive clock synchronous method between above-mentioned well, its step (1) include following sub-step：
(1.1) the standard time clock reference letter that time service module is provided is received by ground launch module and ground receiver module
Number；
(1.2) ground local synchronous clock is generated on the basis of the standard time clock reference signal, realize ground launch mould
Block is synchronous with the clock of ground receiver intermodule.
Preferably, electromagnetic tool send-receive clock synchronous method between above-mentioned well, its step (2) include following sub-step：
(2.1) dutycycle broadening is carried out to the standard time clock reference signal that time service module is provided by ground transceiver module；
(2.2) by broadening after clock signal drive amplification after be sent to downhole system.
Launched by signal dutyfactor and drive amplification, the driving that obtain amplitude, there is long-distance transmissions ability is put
Big signal, to overcome the decay after cable long-distance transmissions to clock signal.
Preferably, electromagnetic tool send-receive clock synchronous method between above-mentioned well, its step (3) include following sub-step：
(3.1) shaping is carried out to the clock signal for receiving by down-hole Shaping Module；
(3.2) by shaping after clock signal be divided into two-way, clock signal will be driven by down-hole drive module again all the way
Ground Shaping Module is passed back to after dynamic amplification；
(3.3) another road clock signal is sent to down-hole transceiver module, down-hole transceiver module is with the clock signal as base
Quasi- generation down-hole local synchronous clock.
Preferably, electromagnetic tool send-receive clock synchronous method between above-mentioned well, its step (4) include following sub-step：
(4.1) by ground Shaping Module by down-hole drive module drive amplification after, through cable transmission after clock letter
Number carry out shaping；
(4.2) the standard time clock reference signal pair that the clock after ground transceiver module is by shaping is provided with time service module
Than calculating deviation, obtaining ground to the transmission delay of down-hole.
Preferably, electromagnetic tool send-receive clock synchronous method between above-mentioned well, its step (5) include following sub-step：
(5.1) delayed data for measuring is sent to down-hole by remote short section through cable and receives and dispatches mould by ground transceiver module
Block；
(5.2) down-hole transceiver module finally realizes down-hole according to the down-hole local synchronous clock generated before delay calibration
Transmitter module is synchronous with the clock of areal receiver-array intermodule.
Between well, electromagnetic logging instrument family domestic demand will be accomplished that down-hole transmitter module is same with the clock of areal receiver-array module
Step；And downhole system is connected with ground system by thousands of meters of cable, it is impossible to the clock for directly providing with reference to time service module；This
This system and method that invention is provided, carries out time service by ground system to downhole system, determines ground by return path signal
With the time delay of down-hole, down-hole send-receive clock is calibrated according to the time delay, realize that transmitting-receiving is synchronous；In general, by this
The contemplated above technical scheme of invention compared with prior art, can obtain following beneficial effect：
(1) electromagnetic tool send-receive clock synchronization system and method between the well that the present invention is provided, are provided by time service module
Canonical reference clock is ensureing the precision clock synchronization of ground system；By ground to down-hole tranmitting data register information realization ground it is
Sync identification of the system to downhole system；The transmission of remote clock signal is achieved, in the environment bar for not unifying reference clock
Under part, it is achieved that the clock synchronization of two nodes；Transmission delay is measured by ground system and delayed data is transferred to down-hole, by
Downhole system is according to delay calibration synchronised clock, it is achieved that down-hole transmitting-receiving is synchronous；
(2) electromagnetic tool send-receive clock synchronization system and method between the well that the present invention is provided, by through cable transmission
Clock signal afterwards carries out Shape correction so that the rising edge information of clock signal is recovered, ground system and downhole system
The clock signal of transmission can effectively be recognized, it is achieved that the real-time Communication for Power of ground and down-hole；
(3) synchronization of electromagnetic tool send-receive clock and method between the well that the present invention is provided, on ground with down-hole respectively to mark
Clock signal and down-hole shaping clock signal are driven enhanced processing, overcome decay caused by telecommunication.
Description of the drawings
Fig. 1 is electromagnetic tool send-receive clock synchronization system schematic diagram between well provided in an embodiment of the present invention；
Fig. 2 is the functional block diagram of electromagnetic tool send-receive clock synchronization system between well provided in an embodiment of the present invention；
Fig. 3 is that the synchronous clock signal of transmitting-receiving provided in an embodiment of the present invention processes schematic diagram；
Fig. 4 is the synchronised clock comparison diagram of down-hole transceiver module provided in an embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, involved technical characteristic in invention described below each embodiment
Do not constitute conflict each other can just be mutually combined.
Fig. 1 show electromagnetic tool send-receive clock synchronization system schematic diagram between the well that embodiment is provided；Including time service mould
Block, ground system, downhole system, remote short section and cable；
By receiving the standard time clock reference signal that time service module is provided, ground system realizes that the clock between ground system is same
Step, and clock signal is sent to downhole system by cable, downhole system exports synchronised clock, and clock signal is returned to
Ground；Wherein, time service module is used for providing high-precision standard time clock reference signal for ground system；Ground system receives time service
The standard time clock reference signal of module output is simultaneously pre-processed, and carries out dutycycle broadening, and root to standard time clock reference signal
The deviation of the standard time clock reference signal provided with time service module according to the clock signal that downhole system feeds back, calculates ground to down-hole
Transmission delay；Downhole system is used for the clock signal after receiving through cable transmission, and exports synchronised clock as benchmark；Electricity
Cable is used for connecting ground system and downhole system, and downhole system is powered；Remote short section is used for transmission time-delayed information.
In the present embodiment, time service module is using GPS or dipper system；Electromagnetic tool transmitting-receiving between the well that embodiment is provided
Clock system also includes that antenna and receiver, antenna are used for the satellite-signal for receiving satellite launch；Receiver is used for decoding
Satellite-signal, outputting standard clock reference signal；
Ground system will be sent to down-hole after clock information drive amplification, down-hole carries out shaping after receiving signal first, so
After be divided into two-way, drive amplification is sent back to ground again all the way, and shaping is received again on ground, and itself and time service module are exported
Standard time clock reference signal carries out measurement of comparison ground to the transmission delay of down-hole；Another road is sent to downhole system, and down-hole is
System exports synchronised clock on the basis of the clock signal for receiving；Ground system is measuring ground to after the transmission delay of down-hole through electricity
Delayed data is sent to downhole system by remote short section by cable；Downhole system is receiving the time delay letter that ground system is sended over
After breath, the synchronised clock of output, the final clock synchronization ensured between downhole system are calibrated.
Downhole system after clock signal is received, when generating high-frequency synchronous by phase-locked loop circuit (PLL) on the basis of which
Clock；In embodiment, phase-locked loop circuit includes phase discriminator, low pass filter, voltage controlled oscillator；PLL is by comparing external signal
The phase place of phase place and voltage controlled oscillator is realizing synchronization；During comparing, phase-locked loop circuit is constantly according to external signal
Phase place until the Phase synchronization of two signals, realizes output signal frequency to input letter adjusting the clock phase of local crystal oscillator
Number frequency from motion tracking.
Fig. 2 is the functional block diagram of electromagnetic tool send-receive clock synchronization system between the well that embodiment is provided, and the system is concrete
Including time service module, ground transceiver module, ground drive module, ground Shaping Module, down-hole transceiver module, down-hole drive mould
Block, down-hole Shaping Module, remote short section and cable；
Wherein, ground transceiver module, ground drive module and ground Shaping Module constitute ground system；Receive and dispatch mould in down-hole
Block, down-hole drive module and down-hole Shaping Module constitute downhole system；
Ground transceiver module carries out dutycycle broadening to the standard time clock reference signal that time service module is provided, and is driven by ground
By standard time clock reference signal drive amplification, through cable transmission to down-hole Shaping Module, down-hole Shaping Module will be received module
Signal carries out shaping, and is divided into two-way；Leading up to down-hole drive module and amplifying again ground Shaping Module is back to through cable
Carry out shaping；Ground transceiver module according to shaping after clock signal, contrast time service module provide standard time clock reference signal
Transmission delay of the measurement ground to down-hole；Another road with the clock signal for receiving is to down-hole transceiver module, down-hole transceiver module
Benchmark exports synchronised clock；The information for measuring transmission delay is sent to down-hole through cable by remote short section by ground transceiver module
Transceiver module, the synchronised clock that down-hole transceiver module is exported according to delay calibration.
Fig. 3 show the handling process of electromagnetic tool send-receive clock synchronous method between the well that embodiment is provided, concrete bag
Include following steps：
(1) transmitting terminal receives the standard time clock reference signal that DVB is exported with receiving terminal ground transceiver module,
And the pretreatment of dutycycle broadening is carried out to the signal；
(2) ground drive module is driven amplification to above-mentioned pretreated clock signal, obtains amplitude, has far
First clock of distance transmitting ability amplifies signal, by cable by the signal transmission to down-hole Shaping Module；
(3) down-hole Shaping Module amplifies signal to the first clock after through cable transmission carries out shaping, specifically includes clock
The recovery of signal rising edge and level conversion, subsequently by shaping after clock signal point two-way；
(4) above-mentioned two paths of signals is wherein carried out drive amplification again by down-hole drive module all the way, obtains second clock
Amplify signal, and be sent to ground Shaping Module；
(5) the other all the way as benchmark of above-mentioned two paths of signals is generated synchronised clock by down-hole transceiver module.
(6) ground Shaping Module down-hole drive module is exported, through cable transmission second clock amplify signal enter
Row Shape correction, during the standard that ground transceiver module is exported with DVB according to the clock signal that ground Shaping Module is exported
Clock reference signal contrast, obtains the transmission delay of transmitting terminal and receiving terminal ground to down-hole respectively；
(7) respective delayed data is sent to down-hole transceiver module by remote short section by ground transceiver module through cable,
Down-hole transceiver module is according to the synchronised clock generated before delayed data calibration, and then realizes down-hole transmitter module and areal receiver-array
Clock synchronization between module.
In an embodiment, it is contemplated that during practical logging, connection ground is very long with the cable length of down-hole, in clock signal
Can which be caused significantly to decay in transmitting procedure, clock signal is driven by amplification using drive module therefore；?
In the present embodiment, drive module is output as differential signal.
Using rising edge information of the Shaping Module recovered clock signal after cable transmission；In the present embodiment, shaping
Module includes amplifier module, for from cable reception clock signal, adjusting the low and high level of clock signal；Igniter module, uses
Rising edge in recovered clock signal；Level switch module, for being ground system and down-hole by the level conversion of clock signal
The receivable level of system.
Fig. 4 show the synchronised clock comparison diagram of the down-hole transceiver module of embodiment offer, from this figure, it can be seen that passing through
This synchronization system and method that embodiment is provided, it is achieved that the synchronization of down-hole send-receive clock.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not in order to
The present invention, all any modification, equivalent and improvement that is made within the spirit and principles in the present invention etc. is limited, all should be included
Within protection scope of the present invention.
Claims (7)
1. electromagnetic tool send-receive clock synchronization system between a kind of well, it is characterised in that including time service module, ground system, well
Lower system, remote short section and cable；
The ground system includes ground transceiver module, ground drive module and ground Shaping Module；Downhole system includes down-hole
Transceiver module, down-hole drive module and down-hole Shaping Module；
The time service module is used for providing standard time clock reference signal for ground system；Cable is used for connecting ground system and down-hole
System is simultaneously powered to downhole system；The remote short section is used for the data communication for realizing ground system and downhole system；
The ground transceiver module is used for carrying out dutycycle broadening to the standard time clock reference signal；And for whole according to ground
The clock signal of shape module output contrasts the transmission delay for obtaining ground signal to down-hole with the standard time clock reference signal；
The ground drive module is used for being driven the clock signal after dutycycle broadening amplification, obtains the first clock and amplifies
Signal；Ground Shaping Module is used for second clock amplification signal to the output of down-hole drive module, through cable transmission to be carried out
Shape correction；
The down-hole Shaping Module is used for amplifying signal to the first clock after through cable transmission carries out shaping；Down-hole drive module
For the clock signal that down-hole Shaping Module is exported is driven amplification, obtains second clock and amplify signal, and be sent to ground
Face Shaping Module；When the down-hole transceiver module is used for generating synchronous on the basis of the clock signal of down-hole Shaping Module output
Clock.
2. between a kind of well based on described in claim 1, between the well of electromagnetic tool send-receive clock synchronization system, electromagnetic tool is received
Send out clock synchronizing method, it is characterised in that comprise the steps：
(1) providing standard time clock reference signal by time service module carries out time service to ground system, makes ground system and time service module
Clock synchronization；
(2) downhole system will be sent to award downhole system after the standard time clock reference signal drive amplification by ground system
When；
(3) carry out shaping to the clock signal for receiving by downhole system, and by shaping after signal be divided into two-way, will wherein all the way
Ground system is fed back to after drive amplification again, wherein another road is generated downhole system synchronised clock as benchmark；
(4) standard time clock reference signal is compared by ground system ground is obtained to down-hole with the clock signal of downhole system feedback
Transmission delay；
(5) downhole system synchronised clock is calibrated according to the transmission delay by downhole system, realizes the transmitting-receiving synchronization of downhole system.
3. electromagnetic tool send-receive clock synchronous method between well as claimed in claim 2, it is characterised in that step (1)
Including following sub-step：
(1.1) the standard time clock reference signal that time service module is provided is received with ground receiver module by ground launch module；
(1.2) on the basis of the standard time clock reference signal generate ground local synchronous clock, realize ground launch module with
The clock synchronization of ground receiver intermodule.
4. electromagnetic tool send-receive clock synchronous method between well as claimed in claim 2, it is characterised in that (2) include
Following sub-step：
(2.1) dutycycle broadening is carried out to the standard time clock reference signal that time service module is provided by ground transceiver module；
(2.2) by broadening after clock signal drive amplification after be sent to downhole system.
Launched by signal dutyfactor and drive amplification, the drive amplification that obtain amplitude, there is long-distance transmissions ability is believed
Number, to overcome the decay after cable long-distance transmissions to clock signal.
5. electromagnetic tool send-receive clock synchronous method between well as claimed in claim 2, it is characterised in that step (3)
Including following sub-step：
(3.1) shaping is carried out to the clock signal for receiving by down-hole Shaping Module；
(3.2) by shaping after clock signal be divided into two-way, clock signal will be driven by down-hole drive module again and be put all the way
Ground Shaping Module is passed back to after big；
(3.3) another road clock signal is sent to down-hole transceiver module, down-hole transceiver module is raw on the basis of the clock signal
Into down-hole local synchronous clock.
6. electromagnetic tool send-receive clock synchronous method between well as claimed in claim 2, it is characterised in that step (4)
Including following sub-step：
(4.1) by ground Shaping Module by down-hole drive module drive amplification after, through cable transmission after clock signal enter
Row shaping；
(4.2) the standard time clock reference signal contrast that the clock after ground transceiver module is by shaping is provided with time service module,
Deviation is calculated, and ground is obtained to the transmission delay of down-hole.
7. electromagnetic tool send-receive clock synchronous method between well as claimed in claim 2, it is characterised in that (5) include
Following sub-step：
(5.1) delayed data is sent to down-hole transceiver module by remote short section by ground transceiver module through cable；
(5.2) the downhole system synchronised clock that down-hole transceiver module is generated according to delayed data calibration steps (3), realizes well
Lower transmitter module is synchronous with the clock of areal receiver-array intermodule.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535772A (en) * | 2018-07-04 | 2018-09-14 | 吉林大学 | A kind of compensation method and device for underground multinode acquisition system time synchronization |
| CN109611076A (en) * | 2018-11-02 | 2019-04-12 | 贝兹维仪器(苏州)有限公司 | A kind of real-time clock synchronous method of well logging device |
| CN111305829A (en) * | 2020-03-26 | 2020-06-19 | 中国石油天然气集团有限公司 | System and method for synchronizing ground-well electromagnetic ground system and underground instrument time service |
| CN112333122A (en) * | 2020-11-03 | 2021-02-05 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Ground and underground synchronization system and synchronization method for inter-well electromagnetic imaging system |
| WO2021047313A1 (en) * | 2019-09-12 | 2021-03-18 | 中兴通讯股份有限公司 | Clock delay detection method and apparatus, clock delay compensation method and apparatus, terminal, and readable storage medium |
| CN114859692A (en) * | 2022-04-11 | 2022-08-05 | 河南中多科技发展有限公司 | Ground-penetrating communication equipment time service method based on Beidou system |
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| CN111305829B (en) * | 2020-03-26 | 2023-05-26 | 中国石油天然气集团有限公司 | Underground well electromagnetic ground system and underground instrument time service synchronization system and method |
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