CN106199719A - A kind of VSP during drilling measures clock system and method - Google Patents
A kind of VSP during drilling measures clock system and method Download PDFInfo
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Abstract
The present invention relates to a kind of clock system and method, belong to technical field of geophysical exploration, be specifically related to a kind of VSP during drilling and measure clock system and method.Including: ground synchronous device, underground synchronous device, energy source synchronizer.The present invention sends synchronous averaging or the unlatching of end signal control downhole instrument and stopping in whole moment second；By the time of recorded downhole with ground timing as reference, thus eliminate time error；Further, ground accurate clock is delivered to down-hole by time data carrying device by the present invention, it is possible to the timing error that correction VSP clock produces because of its Long-term stability difference under the hot environment of down-hole.
Description
Technical field
The present invention relates to a kind of clock system and method, belong to technical field of geophysical exploration, be specifically related to one
Plant VSP during drilling and measure clock system and method.
Background technology
Along with the increasing of oil-gas exploration and development difficulty, vertical seismic profiling (VSP) (Vertical Seismic Profiling,
VSP) using value of drilling measuring technology shows especially day by day, especially before its stratum visit function, investigative range much larger than other with
Bore logging tool.Deep & ultra-deep well Karst cave is accurately positioned the problems such as the card layer with high pressure formation to be the most still difficult to solve.
Such as, relevant data show, northern Tarim basin solution cavity drilling success in Tarim Region is 59.5%, utilizes VSP during drilling work
Having and this area's failure well is carried out second positioning, the Drilling ratio of solution cavity can be made to improve to 85%, buried hill depth localization error is little
In 1%, significantly reduce drilling risk, save drillng operation cost, and improve drilling well timeliness.
VSP during drilling is Observation Technology of Earthquakes in a kind of well, and it is based on cable VSP technology, by seismic wave detection, data
Gather with on the instrument integration such as storage to down-hole equipment, in the case of not affecting normal drilling operability, measure in real time and record ground
The seismic wave that face focus produces signal after stratum transmission, reflection, thus obtain VSP during drilling data, by measurement result
When walking, polarity, phase place, amplitude etc. analyze, obtain the interface depth of drill bit earth layer in front, stratigraphic section and rock properties
Deng, its investigative range is up to hundreds of meters before drill bit.Compared with surface seismic, owing to VSP during drilling data obtain in shaft bottom, earthquake
Propagation path is relatively short, and high frequency signal attenuation is less, therefore, has that signal to noise ratio is high, resolution high, and kinesiology, dynamic
The advantages such as mechanical characteristics is obvious.Compared with normal cable VSP, VSP during drilling is to measure, no during drillng operation makes up a joint
Interference drillng operation, takies rig time few, and construction risk is little, and drilling cost is low.Additionally, VSP during drilling can be simultaneously received
Row ripple and down going wave, can be used to estimate deconvolution operator for surface seismic data；Multi-components VSP during drilling also can record compressional wave simultaneously
And shear wave, it is achieved multi-wave multicomponent exploration.
The key technology of VSP during drilling survey tool is accurately to measure the seismic wave outward journey time, but the severe ring in down-hole
Border obtains high precision clock, be limit VSP during drilling survey tool can the key factor of actual application, usually require that work
After 200 hours, timing cumulative errors in down-hole are less than 1ms, and this is for conventional crystal oscillator, it is difficult to meet and accurately measure seismic wave
The needs of hourage.The strong vibration to be born of downhole sensor device, impact in drilling process, need to design special installation knot
Structure can meet with the requirement boring instrument.The seismic wave of epicenter excitation is after earth-attenuation reaches shaft bottom, on VSP survey tool
The coupling effect of sensor and the borehole wall to signal detection by decisive influence, additionally, existing ground and down-hole real-time Communication for Power skill
Art factor data transfer rate limits, it is impossible to the most effectively obtain underground survey data.
Sum it up, how to guarantee VSP seismic wave sensors and the coupling effect of the borehole wall, sensor shock-damping structure and height
Precision downhole clock is the main bugbear that VSP during drilling technology needs to overcome.
Summary of the invention
The VSP during drilling survey tool that the present invention mainly solves existing for prior art is difficult to obtain in the adverse circumstances of down-hole
Obtain the technical problem of high precision clock, it is provided that a kind of VSP during drilling measures clock system and method.This system and method exists
Whole moment second sends synchronous averaging or the unlatching of end signal control downhole instrument and stopping；And upper at pulse triggering signal
Rising and blow out along time trigger energy source controller, accurate recording is blown out the moment, by the time of recorded downhole with ground timing as reference,
Thus eliminate time error；By time data carrying device, ground accurate clock is delivered to down-hole, it is possible to correction simultaneously
The timing error that VSP clock produces because of its Long-term stability difference under the hot environment of down-hole.
In order to solve the problems referred to above, according to an aspect of the invention, it is provided a kind of VSP during drilling measures clock synchronizes system
System, including: ground synchronous device, underground synchronous device, energy source synchronizer, wherein:
Described ground synchronous device receives the synch command of user, starts in whole moment second or terminates and underground synchronous device
Simultaneously operating；
Described energy source synchronizer produces pulse triggering signal, and at the rising edge time triggering focus of pulse triggering signal
Controller is blown out；
The rising edge of a pulse moment of pulse triggering signal when described ground synchronous device real time record is blown out, and by pulse
Rising edge time according to blow out order preserve into the file with time marking；
Downhole instrument acquisition scans signal, and store into the digital waveform file with time marking.
Optimizing, above-mentioned a kind of VSP during drilling measures clock system,
Described energy source synchronizer includes coding unit and decoding unit, described coding unit and ground synchronous device phase
Even；Described decoding unit be positioned at focus side and with coding unit communication；
Described underground synchronous device is positioned in VSP survey tool, and protects with it with the signal of ground synchronous device for reference
Hold synchronization；
Described ground synchronous device includes GPS reference clock source.
Optimizing, above-mentioned a kind of VSP during drilling measures clock system, and described GPS reference clock source includes: numeral letter
Number processor, and be connected with digital signal processor GPS time service module, nonvolatile memory cell, LCD MODULE, with
Pace pulse output, triggering detecting signal unit, button detector unit, communication interface and power circuit.
Optimizing, above-mentioned a kind of VSP during drilling measures clock system, described energy source synchronizer and energy source controller
Using 4 line systems to connect, wherein start pulse signal and GND mono-group, scanning signal and GND are one group, and often group signal uses a pair
Twisted-pair feeder, two groups of holding wires are bare wire, are connected by adapter.
Optimizing, above-mentioned a kind of VSP during drilling measures clock system, also includes time correction device, described time
Correcting unit includes the control storage circuit for storing temporal information, for carrying out data interaction with down-hole VSP survey tool
Coupling coil, and floating drum.
In order to solve the problems referred to above, according to another aspect of the present invention, it is provided that a kind of VSP during drilling is measured clock and synchronized
Method, including: ground synchronous device, underground synchronous device, energy source synchronizer, wherein:
Described ground synchronous device receives the synch command of user, starts in whole moment second or terminates and underground synchronous device
Simultaneously operating；
Described energy source synchronizer produces pulse triggering signal, and at the rising edge time triggering focus of pulse triggering signal
Controller is blown out；
The rising edge of a pulse moment of pulse triggering signal when described ground synchronous device real time record is blown out, and by pulse
Rising edge time according to blow out order preserve into the file with time marking；
Downhole instrument acquisition scans signal, and store into the digital waveform file with time marking.
Optimizing, above-mentioned a kind of VSP during drilling measures clock synchronizing method,
Described energy source synchronizer includes coding unit and decoding unit, described coding unit and ground synchronous device phase
Even；Described decoding unit be positioned at focus side and with coding unit communication；
Described underground synchronous device is positioned in VSP survey tool, and protects with it with the signal of ground synchronous device for reference
Hold synchronization；
Described ground synchronous device includes GPS reference clock source.
Optimizing, above-mentioned a kind of VSP during drilling measures clock synchronizing method, and described GPS reference clock source includes: numeral letter
Number processor, and be connected with digital signal processor GPS time service module, nonvolatile memory cell, LCD MODULE, with
Pace pulse output, triggering detecting signal unit, button detector unit, communication interface and power circuit.
Optimizing, above-mentioned a kind of VSP during drilling measures clock synchronizing method, described energy source synchronizer and energy source controller
Using 4 line systems to connect, wherein start pulse signal and GND mono-group, scanning signal and GND are one group, and often group signal uses a pair
Twisted-pair feeder, two groups of holding wires are bare wire, are connected by adapter.
Optimizing, above-mentioned a kind of VSP during drilling measures clock synchronizing method, also includes time correction device, described time
Correcting unit includes the control storage circuit for storing temporal information, for carrying out data interaction with down-hole VSP survey tool
Coupling coil, and floating drum.
Therefore, present invention have the advantage that (1) sends synchronous averaging or end signal control downhole instrument in whole moment second
The unlatching of device and stopping；By the time of recorded downhole with ground timing as reference, thus eliminate time error；(3) pulse-triggered
The rising edge time of signal triggers energy source controller and blows out, and moment record is precisely；(2) by time data carrying device by ground
Accurate clock delivers to down-hole, it is possible to correction VSP clock produces because of its Long-term stability difference under the hot environment of down-hole
Timing error.
Accompanying drawing explanation
Accompanying drawing 1 is VSP during drilling measuring principle schematic diagram；
Accompanying drawing 2 is VSP during drilling measurement procedure schematic diagram；
Accompanying drawing 3 is VSP during drilling survey tool schematic diagram；
Accompanying drawing 4 is the seismic signal waveform diagram that four component VSP measure；
Accompanying drawing 5 is that VSP during drilling measures sensor installation device schematic diagram；
Accompanying drawing 6 is drill string vibration state oscillogram；
Accompanying drawing 7 is backup mechanism controls schematic diagram；
Accompanying drawing 8 is data carriers structural representation；
Accompanying drawing 9 is the Digital Signals electrical block diagram of data carriers；
Accompanying drawing 10 is data carriers workflow diagram；
Accompanying drawing 11 is synchronizer connection diagram；
Accompanying drawing 12 is that clock synchronization apparatus serial data exports schematic diagram；
Accompanying drawing 13 is clock synchronization apparatus principle schematic；
Accompanying drawing 14 is that underground signal is measured and data storage principle block diagram；
Accompanying drawing 15 is data high-speed playback interface schematic diagram；
Accompanying drawing 16 data high-speed playback program flow chart；
Accompanying drawing 17 data high-speed playback program state diagram.
Detailed description of the invention
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
In figure, the borehole wall 101, data carriers 102, VSP survey tool the 103, first bed boundary the 104, second ground stratum boundary
Face 105, focus 106, terrestrial clock synchronizer 107, direct wave the 108, first echo the 109, second echo 110, VSP coupling
Zygonema circle 301, signal transmission circuit 302, the first hydrophone 303, data communication mouth 304, precision interval clock assembly 305, down-hole master
Control circuit 306, Z axis cymoscope 307, X-axis cymoscope 308, battery sleeve 309, the second hydrophone 310, seat mechanism for card 311, signal
Receive circuit 312, data storage circuitry 313, signal acquisition circuit 314, Y-axis cymoscope 315, measuring probe 501, seal structure
502, retaining ring 503, cymoscope 504, holding wire 505, sensor fixing body 506, fuel tank 701, electromagnetic valve 702, push action cylinder
703, backup block 704, overflow valve 705, check valve 706, oil pump 707, brushless electric machine 708, VSP survey tool body 801, mud
Passage 802, VSP side coupling coil 803, carry side guiding surface 804, VSP side guiding surface 805, floating drum 806, control storage
Circuit 807, carrying device coupling coil 808, magnet 809, Hall element 810, rod-like body 811, docking chamber 812.
Embodiment:
1, system structure
As it is shown in figure 1, the four component VSP during drilling that the present invention proposes measure system mainly by surface energy source, VSP underground survey
Instrument, data carriers, terrestrial clock synchronizer and data handling system etc. form.Wherein down-hole VSP survey tool by
Be distributed in X, Y, Z axis to three detector array, two hydrophone, circuitry for signal measurement, Data acquisition and storage circuit, letters
Number receive and the composition such as radiating circuit, system power supply observation circuit, data high-speed download interface and battery sleeve.Down-hole VSP surveys
Amount system is as shown in Figure 3.
Down-hole VSP survey tool is the important core part of whole measurement system, and its effect is the ground gathering areal receiver-array
Seismic wave signal also automatically extracts the preliminary wave time (check shot time), is stored in memorizer seismic waveform data to pull out of hole
After be further analyzed process.VSP during drilling data the most effectively depend on the precise synchronization of downhole measurement tools and ground installation,
To this end, underground survey system selects the benchmark that High Precision Crystal Oscillator source records as the time, terrestrial clock is then using gps clock as ginseng
Examine clock source, proofreaded a terrestrial clock every 1 second, thus the accuracy of measurement result has been effectively ensured.In order to obtain in time
To underground survey data, drilling process utilizes pump pressure data carriers is pressed into shaft bottom, carry out data friendship with VSP survey tool
Mutually, quickly read measurement data and the preliminary wave time of each shot point extraction, utilize these data to can get time and depth transfer relation,
For time domain seismic profile being transformed into Depth Domain, and can bit location be marked on seismic profile, for drilling engineer
Decision-making foundation is provided.Owing to down-hole VSP survey tool works in the interim that makes up a joint, when down-hole equipment remains static,
Surface energy source is i.e. blown out to stratum earthquake-wave-exciting, and three axial cymoscopes simultaneously measure compressional wave and the shear wave of earthquake, it is simple to
Data are processed later and do quantitative analysis.And the seismic signal of two hydrophone receptions is non-directional, current for calculating
Seismic velocity and direct wave do wave field separation with transmitted wave.
In VSP during drilling measurement system, focus is placed near the well head of ground, generally distance well head about about 50m.Focus
Usually controlled source, it is the focus of a kind of continuous frequency sweep vibration, and frequency range is about 10～100Hz, and its advantage is anti-dry
Ability of disturbing is strong, reproducible.Surveyed by surface geophone as it is shown on figure 3, surface energy source produces scanning signal az, this signal az simultaneously
Amount record.Down-hole is installed on the detector array of VSP during drilling survey tool and measures the preliminary wave that focus transmits through stratum
Signal bz, from focus generation signal az to areal receiver-array to signal bz, the time experienced is tz1.Source signal az continues downwards
Resume and be multicast to bed boundary and can produce reflection wave signal cz and dz.Reflection wave signal cz and dz is arrived by well geophone array received
That used is tz2 and tz3 when walking.Owing to ripple signal bz and reflection wave signal cz and dz is detected by same detector array
Recorded, signal bz, cz be overlapped mutually with dz together with cannot be carried out distinguish.Accordingly, it would be desirable to focus to be scanned signal az and letter
Number bz, cz and dz carry out computing cross-correlation and process and obtain signal fz.Signal fz obtains and time tz1, tz2 and tz3 in time domain
Three relevant characteristic signals, the most corresponding preliminary wave signal az, reflection wave signal bz and cz.
VSP during drilling tool operation flow process is as in figure 2 it is shown, be described in detail below:
Before brill: downhole tool synchronizes terrestrial clock, and arranges the running parameter of downhole instrument.In brill: 1. underground signal is adopted
Collector the most in a dormant state, once automatically detects drillng operation and stops, then open down-hole sampling configuration, detect detection
The signal that device receives.If 2. drilling tool remains static, mud circulation suspends, then excite surface energy source.For avoiding downhole instrument
Device is activated by drilling tool noise, will be analyzed the feature of seismic wave projectile energy, determines and effectively blows out after information, will under
The acquired data storage of one big gun, and first break picking ripple time.The most once automatically detect drillng operation to start, then time by preliminary wave
Between and Wave data be stored in memorizer, wait data carriers read, later on down-hole park mode.4. ground system
Utilize preliminary wave time timely erection rate model and time and depth transfer relation, and drill bit be positioned on surface seismic section,
To provide foundation for formulating informed drilling decisions.After brill: after trip-out, the whole audience waveform acquisition data in downhole memory are derived, after
Phase does VSP data and processes.
2, sensor fixing structure
Compared with cable VSP, VSP during drilling measures cymoscope and hydrophone down-hole the to be tolerated judder that system is used
With impact, its mounting structure is the most special.
Three geophones are respectively arranged in diverse location on VSP tool body, mutually in X, Y, Z axis to orthogonal pass
System.Body is recovered to after being measured outwardly against to the borehole wall from body when measuring in view of cymoscope, therefore by three
Cymoscope is separately mounted in the internal die cavity of three backup blocks.Cymoscope owing to using is velocity profile analog detector, its knot
Structure includes column type permanent magnet, upper and lower two magnetic boots, coil and coil brace, to the passive spring leaf of coil etc., whole
Individual cymoscope is a single-degree-of-freedom coasting body.Having two groups of coils mutually rewound on coil brace, external magnetic field is on coil
The noise produced is cancelled out each other.The magnetic boots at magnet steel two ends guarantee that field homogeneity is distributed, and enhance magnetic field intensity.Work as epicenter excitation
During seismic wave, cymoscope shell produces motion and makes coil create relative motion in magnetic field, and coil cutting magnetic line produces
Induction electromotive force, the size of its voltage depends on the speed of motion.Illustrate to the mounting structure of cymoscope with X, such as Fig. 5 institute
Showing, sensor installation device is by measuring probe 501, sealing structure 502, retaining ring 503, cymoscope 504, holding wire 505, sensing
Several parts compositions such as device fixing body 506.Wherein, sensor installation device is arranged on body and the distance rod of hydraulic thrust oil cylinder
Connecting, two seals structure effectively prevents mud to immerse, and cymoscope is fixed on the internal die cavity of backup block, locking by retaining ring
Ring and backup block use multiple screws to fix, and the output signal line of cymoscope is connected to measuring circuit by high pressure sealing contact pin.
VSP tool body top and bottom are respectively arranged with a hydrophone nacelle, have been respectively mounted the first hydrophone 303 and second
Hydrophone 310, both L separated by a distance, for measuring current interval velocity, obtain the information needed for time and depth transfer, because of it
Receive the seismic wave signal around VSP instrument, i.e. the fluctuation of pressure field in annular space mud, Policy Result is a scalar value, for rear
Phase carries out the data that wave field separation provides necessary.Hydrophone is used for measuring the pressure oscillation that seismic wave produces in annular space mud,
Due to one scalar of this pressure oscillation, no matter seismic wave from which direction hydrophone all can sensitive fluctuate to mud pressure, therefore
Without pushing against the borehole wall, just can measure the seismic wave signal that the coupling of annular space mud comes, after hydrophone is installed to nacelle, use lid
Plate seals, and uses multiple screw to connect firmly between cover plate and body, and devises a circular hole on cover plate by mud introducing
To hydrophone sensitive area, propagate, by annular space mud, the seismic signal of coming in for receiving.
3, drilling tool state-detection
VSP during drilling measurement is to carry out in the interim that makes up a joint, and slush pump quits work, and drilling tool keeps resting state, this
Time, surface energy source is to down-hole earthquake-wave-exciting, down-hole VSP instrument guarantee measurement result accurate and effective.To this end, down-hole controls
Being mounted with two axis accelerometers in circuit, for the vibrational state of monitoring drilling tool in real time, the drill string vibration signal of measurement is by band
After bandpass filter, remove DC component and high-frequency information that signal packet contains, a reservation medium and low frequency multidate information, thus control circuit
Automatically drilling tool state is detected, it is judged that whether down-hole starts collection storage.Due to the main control singlechip mathematics selected in VSP instrument
Operational capability is poor, carries out relative complex calculating when needing to take relatively multimachine, can affect the reliability of whole system work, therefore
Use better simply algorithm (such as multiplication and division all use and take advantage of or except the method for 2N realizes) as far as possible.
Onboard accelerometer can the sensitive quasi-periodic vibration longitudinal to drilling tool, and slush pump, rotating disk bore or they
Quasi-periodic vibration frequency caused by compound action is not less than 1Hz.Implementation method is as follows:
(1) first the longitudinal acceleration signal that accelerometer detects is carried out bandpass filtering, remove direct current signal and high frequency letter
Number；
(2) accekeration after bandpass filtering is compared with threshold value ± Δ g (± 40mg), determine this value whether mistake
Zero；The most known accekeration is from the occasion of to negative value direction zero passage, and acceleration measurement the most subsequently and+Δ g compare, and determine
Whether from negative value on the occasion of direction zero passage；2. when known accekeration from negative value on the occasion of direction zero passage, acceleration the most subsequently
Measured value and-Δ g compare, it is determined whether from the occasion of to negative value direction zero passage；
(3) (15 seconds) statistics accekeration zero passage number of times within the time specified；
(4) if statistical value >=30, i.e. think and there is a quasi-periodic vibration, otherwise it is assumed that produce without quasi-periodic vibration；
(5), in continuous 3 statistics, if number of times >=2 of " statistical value >=30 ", then VSP instrument is allowed to be acquired storage, no
Then forbid that VSP instrument is acquired storage.
(6) threshold value selects.By limited shaft bottom axial acceleration storage data are repeated comparative analysis, simulate threshold
Value is defined as ± 40mg substantially.According to
Wherein, Acc is the accekeration (g) calculated, and T1 is the high-pulse widths relevant with acceleration magnitude, T2=
12064 is the pulse period unrelated with acceleration magnitude, and Δ T=2T1-T2 is down-hole single chip computer measurement the centre calculated
Variable.Can be obtained from above
When arranging analog threshold for ± 40mg, can obtain digital threshold is Δ T ≈ ± 38.
Embodiment 1:
Duty STPUMP of slush pump is set automatically by the difference being respectively compared AxRMS and AyRMS and Ath.
AxRMS-Ath ＞ 0 or AyRMS-Ath ＞ 0
Then STPUMP=1 (turn on pump)；Otherwise STPUMP=0 (pass pump).
Wherein, AxRMS is X axis vibration sensor root-mean-square value, i.e.
AyRMS is Y axis vibration sensor root-mean-square value, i.e.
Ath is the artificial comparison threshold value (needing to be obtained by test) arranged, and Axi is that X-axis (passage 0) is shaken after high-pass filtering
Dynamic sensor AD sampled value (two bytes have symbol integer number), Ayi is that Y-axis (passage 1) vibrating sensor AD adopts after high-pass filtering
Sample value (two bytes have symbol integer number).N is average time (being tentatively set to 256), need to open up according to filtering channel number and N and deposit
Memory space (2 × 256 words).
Embodiment 2:
Because Axi (or Ayi) is that two bytes have symbol integer number, and the result of Axi ÷ 256 (or Ayi ÷ 256) is the most just
It is the high byte (being designated as AxiHGH and AyiHGH respectively) taking Axi (or Ayi), so needs the memory space opened up can reduce one
Half (2 × 256 bytes).
AxRMS is X axis vibration sensor root-mean-square value, i.e.
AyRMS is Y axis vibration sensor root-mean-square value, i.e.
The vibration damping of circuit board and the decay of high pass filter cause AxiHGH and AyiHGH to be often 0 (i.e. dynamic acceleration value
Always less than 1g), now automatic decision may lose efficacy, and needs to be verified by test.To described drilling tool state-detection
Method has carried out verification experimental verification, and as shown in Figure 6, wherein surface mud pump work frequency is about 1.5Hz to actual result, the mud of calculating
Stock pump operating frequency frequency (before removing burst pulse) is 1.67Hz, the slush pump operating frequency frequency (after removing burst pulse) of calculating
For 1.67Hz, it is seen that testing result can be as effective criterion of down-hole equipment state.
4, backup mechanism
Coupling effect between cymoscope and the borehole wall the most effectively has vital impact to seismic wave measurement data.
When drillng operation suspends (making up a joint), electric circuit in well detects that drilling tool remains static, and control circuit starts brushless electric machine,
Drive oil pump to rotate the hydraulic oil produced, after check valve, enter push action cylinder, thus promote drive rod will to carry cymoscope
Backup block backup quits work, owing to the hydraulic oil in push action cylinder is without releasing back after running certain time interval T to the borehole wall, motor
Road, backup mechanism is in packing state.Now VSP instrument in down-hole just starts gather seismic signal and store measurement data, etc.
To gathering after storage completes, sending control command and allow electromagnetic valve action, quickly released by hydraulic oil to fuel tank, backup block is at spring
Effect is lower regains rapidly, terminates this signal measurement.
As it is shown in fig. 7, sensor backup mechanism by fuel tank 701, electromagnetic valve 702, push action cylinder 703, backup block 704, overflow
Several parts compositions such as stream valve 705, check valve 706, oil pump 707, brushless electric machine 708, wherein, fuel tank 701 is bladder-type cell.Below
Being described in detail control principle: oil pump 707 produces hydraulic oil under motor 708 drives, output to check valve 706 connection pushes away
Power cylinder 703, it is contemplated that be likely encountered bigger counteracting force during backup, causes oil cylinder to build the pressure and damages hydraulic system,
Indirect an overflow valve 705, effectively protection hydraulic system safety at oil cylinder 703 entrance and fuel tank 701.Electromagnetic valve 702
Effect is after measurement terminates, and provides a quick current by pass for push action cylinder, it is ensured that thrust block pad can be regained smoothly.Brushless
Motor 708 uses soft starting mode to be controlled, and it adjusts accelerator be the even acceleration of elder generation, reaches after setting speed with constant speed
Running, its benefit is that electric motor starting rush of current is less, is that reliability is high.
5, data carriers
Current more advanced mud-pulse transfer rate also can only achieve 3～5bps, and other are such as intelligent drilling rod transmission technology,
Although transfer rate reaches as high as 100kbps, but its reliability when heavy duty service is relatively low, and relatively costly, whole system is multiple
Miscellaneous huge, it is not suitable for real-time Transmission VSP during drilling all-wave field data.Owing to the all-wave data of VSP during drilling systematic survey are temporarily protected
Be stored in downhole memory, it is impossible to upload in real time, can only be derived again after by the time pulling out of hole, largely limit with
Bore the feature that VSP system is measured in real time.Additionally, terrestrial clock is separate with downhole clock, the two is respective after synchronous averaging
Timing, owing to downhole clock receives high temperature impact, causes the long-time stability of downhole clock to drop compared with terrestrial clock
Low, and high-precision underground clock is the key of whole VSP during drilling system, usually require that after 200 hours down-hole VSP instrument with
Timing error between terrestrial clock is less than 1ms, thus use data carriers by with under the temporal information of ground precise synchronization
Reach VSP instrument, can effectively eliminate the timing error that downhole clock produces, thus improve borehole seismic wave measurement precision.
In order to obtain required down-hole VSP data in time, the present invention proposes a kind of novel data timesharing and carries
Device.It has two major functions, and one is that down-hole VSP data are read in timesharing, and two is to carry precise time information, is used for proofreading
The error that down-hole VSP clock produces.As shown in Figure 8, this data carriers is cylindrical-shaped structure, mainly by VSP survey tool originally
Body 801, slurry channel 802, VSP side coupling coil 803, carry side guiding surface 804, VSP side guiding surface 805, floating drum
806, storage circuit 807 is controlled, carrying device coupling coil 808, magnet 809, Hall element 810, rod-like body 811, right
Connect several parts compositions such as chamber 812.Wherein the control of data carriers with storage circuit as it is shown in figure 9, main by digital signal control
Device processed, signal transmitter unit, signal modulating unit, transmitting coil, signal receiving unit, receiving coil, signal demodulation unit, suddenly
That detecting signal unit, memory cell and low-tension supply composition.Coupling coil is wound on magnetic core, in order to improve signal coupling
Close effect and message transmission rate magnetic core and select high-permeability material, it is possible to achieve and high-speed data between VSP instrument is wireless
Transmission.Immersing in view of mud, coil surface is provided with protection sleeve.In order to ensure data transmission bauds and reliability, two
Clearance control between coupling coil is within 1mm.Control to be arranged on data carriers body interior with storage circuit, use electricity
Pond group is as power supply.Data carriers detects whether hall signal is high level in real time, thus controls whether to carry out data interaction.
Data carriers is operated under holotype, controls data transfer direction, and VSP tool work is from pattern.With data carriers
Have an identical inclined-plane guide frame on the VSP tool body of docking, and Hall element just to position permanent magnet is installed,
Its objective is after data carriers docks successfully with VSP instrument, under the action of a magnetic field of permanent magnet, data carriers can be examined
Measuring a high level signal, as whether docking successful status signal, when this status signal is only for high level, data are handed over
Just carry out mutually.If in data transmission procedure, mated condition signal step-down, then preserve this digital independent result, waiting state
Continue when signal is high to read data, it is achieved that data breakpoint resumes, thus ensure that the reliability of each data interaction.Due to
Seat card on VSP instrument uses inclined-plane guide-localization, therefore devises 6 pod apertures in instrument upper end, mud has been effectively ensured and has led to
There are enough water conservancy diversion cross sections in road, guarantees that data carriers can reliably dock with VSP instrument under mud pressure effect.
The concrete workflow of data carriers is as shown in Figure 10.Now this data carriers operation principle is done following detailed
Illustrate: when needs obtain down-hole VSP data, start data carriers work, when carrying out Tong Bu pair with terrestrial clock, and arrange
Good berth parameter, puts into drilling tool central ports, under surface mud pump function, is pressed into shaft bottom, due to VSP instrument and number
According to all there being guiding surface in carrier, therefore carrier can be automatically positioned VSP tool seat card, the permanent magnetism on VSP tool body
Under the action of a magnetic field that body produces, Hall element one high level signal of output on data carriers, control and storage circuit
Once detecting this level is height, represents that data carriers docks successfully with VSP instrument, begins through respective coupling coil and carry out
Data interaction, if it is low for controlling with storage this level of electric circuit inspection, then it represents that dock unsuccessfully, do not communicate with VSP instrument.Number
After successfully docking according to carrier, precise time this moment is sent to VSP instrument by data carriers, in order to eliminates VSP clock and exists
The timing error produced because of its Long-term stability difference under the hot environment of down-hole, reads data each time according to pre-set
Data length and baud rate are carried out, and after pending data has read, data carriers then stops reading, and the data received is carried out
Storage.When ground, slush pump quits work, and automatic emersion to well head, then is taken instrument shelter by data carriers, downloads institute
The data read.
6, clock synchronization apparatus
VSP during drilling is measured system and is made up of downhole data collecting unit and ground auxiliary signal collecting unit two parts, and two
The clock synchronization accuracy of individual unit requires the highest (< 1ms), and ground synchronous device use GPS as reference clock source, its timing
Precision is up to 1us level.It is synchronization that on the one hand ground synchronous device to carry out clock with underground survey unit, the most then want in real time
Record focus is blown out the moment, in order to obtain the underground survey data that each big gun is corresponding.Additionally, need collection to sweep for controlled source
Retouch signal waveform, for data correlation process.Usually require that ground synchronous device is the highest with Seismic Source System time synchronisation precision,
Reach tens us levels.
As shown in figure 11, controlled source synchronous control system includes two parts, i.e. coding unit and decoding unit, normally
Face synchronizer and focus coding unit are positioned at instrument shelter, and decoding unit is then blown out a little in well site, use therebetween wired
Or wireless mode connects.Ground GPS synchronizer is that 4 line systems are connected with energy source controller, and wherein start pulse signal is and GND
One group, scanning signal and GND are one group, and often group signal is a pair twisted-pair feeder, and length about about 2m, two groups of holding wires are naked
Line, needs mating connector voluntarily.Focus triggers the positive pulse that signal is amplitude 2～5V, meets Transistor-Transistor Logic level specification, and it drives
Ability is up to 20mA.Scanning signal frequency is 6～125Hz, and signal amplitude is 0～12V, reaches maximum, afterwards after 0.5s
For constant amplitude sinusoid swept-frequency signal.Scanning signal is continuous signal, and focus often triggers and the most then sends a string frequency sweep ripple, conventional frequency
Rate scope about 8～96Hz, sweep time about 8～20s, selectes according to concrete geological conditions.Ground synchronous device is with gps clock
As reference, with underground survey system precise synchronization timing, real time record surface energy source is blown out the moment, is accurate to 0.01ms, adopts
Collection storage scanning signal waveform does rear cross correlation process, sampling interval 1ms, and data length is 24Bits.
Gps satellite can provide accurate UTC (the universal time coordinated) time to believe in the world
Breath.GPS time service module is utilized to receive the UTC time information of satellite, by its interface and digital signal processor in synchronizer
Communication serial port be connected, and the GPS time information of reception is reached digital signal processor, then by software to receiving
UTC time information processes, in order to correct the precise time of synchronizer.As shown in figure 13, ground GPS synchronizer is main
Including: the output of digital signal processor, GPS time service module, nonvolatile memory cell, LCD MODULE, lock-out pulse, triggering
Detecting signal unit, button detector unit, communication interface and power circuit etc..This device is with GPS time service module as core, logical
Cross serial ports and get absolute time information (Year/Month/Day/time/point/second) accurately from GPS time service module, and every 1s
(PPS) clocking value of calibration, has been effectively ensured the accuracy of timekeeping of ground synchronous device.
In order to ensure down-hole and ground timing precise synchronization, after downhole instrument powers on and configured parameter, ground synchronous fills
Put in whole moment second, send synchronous enabling signal to downhole instrument so that it is start working；After instrument pulls out of hole, ground installation is again
Secondary in whole moment second, send synchronization end signal to downhole instrument so that it is quit work.By the time of recorded downhole in terms of ground
Time be reference, available timing error, data processing stage is eliminated.After VSP instrument enters well, make at drilling tool when making up a joint
In resting state, surface energy source starts to excite blows out, and energy source controller produces and triggers signal simultaneously, and GPS synchronizer is remembered in real time
Record trigger signal pulse rising edge time, for accurately finding the underground survey data that this big gun seismic signal is corresponding, and will
Record trigger the moment according to blow out order preserve into the file with time marking.The spy excited for controlled source frequency sweep
Point, synchronizer needs to gather storage scanning signal waveform, for later data relevant treatment, determines according to field geology conditions
After scanning signal parameter, produce moment (rising edge) acquisition scans signal triggering signal, and store into time marking
Digital waveform file.The file of GPS synchronizer record is uploaded to computer by RS-485 bus, carries out at data for the later stage
Reason and analysis decision provide necessary data.
7, signals collecting stores with data
As shown in figure 11, the signal acquisition circuit that the present invention proposes controls down-hole 5 24 ADC of passage to X, Y, Z axis detection
Device signal and two hydrophone signals are measured in real time, and its collection result are stored in serial sram chip array and carry out
Caching.In circuit high accuracy 24 ADC be TI company high reliability product A DS1278HT, its high sampling rate up to
144KSPS, 70KHZ bandwidth is sufficient for the 10～100HZ swept-frequency signals collection requirements that surface controllable focus produces, when it works
When high resolution model, its signal to noise ratio can reach 111db.After cymoscope and hydrophone detect seismic signal, warp respectively
Cross preposition modulate circuit to be amplified, in order to meet ADS1278HT and carry out analog digital conversion requirement.Preamplifier uses low merit
Consumption, rail-to-rail, programme-controlled gain differential amplifier THS4521.Digital signal controller uses Microchip company
DsPIC33FJ128MC710A controls ADS1278HT as main control chip and is operated in synchronous acquisition mode, is read by SPI port
Gather the data of conversion, and by these data by spi bus write sram chip array caches.Sram chip array is adopted
With 8 1Mbit high temperature sram chip cascades, memory capacity, up to 128KB, meets and automatically extracts seismic wave first arrival time with real
Time data process required buffer memory capacity requirement.
As shown in figure 14, the earthquake that data storage circuitry detects for storage well lower sensor (cymoscope and hydrophone)
Signal waveform, carries out data readback, in order to do further VSP data process&analysis in well site after trip-out.Owing to seismic wave is believed
Number sampling interval be 1ms, data length is 24Bit, and 5 channel acquisition data volume once is 15 bytes, therefore, with brill
VSP measures system downhole data memory capacity to be needed to reach more than 2GB.Main control chip dsPIC33FJ128MC710A is for depositing
Storage chip array be written and read control, and receive by signal acquisition circuit main control chip send data cached.Storage array
After the instructions such as erasing, read/write address are arranged are sent to main control chip by ground-based computer by RS485 bus, then by master control core
Sheet controls corresponding NORFLASH storage chip.Data storage circuitry is carried out memory chip battle array by with a piece of high temperature CPLD chip
Row management, this chip uses VERILOG language to be programmed it, it is achieved 5 input 32 output control functions, for high to 32
Temperature NORFLASH storage chip carries out sheet choosing management.Main control chip is responsible for collaborative CPLD Yu NORFLASH chip by spi bus
Work, completes the SPI Read-write Catrol to every a piece of NORFLASH chip.The 64MB that storage chip array have employed magnesium light company is high
Temperature NORFLASH storage chip, whole memory element is made up of 32 64MB storage chip cascades, and total memory capacity is up to 2GB.
It is 1ms that VSP during drilling measure system requirements every channel signal collection to meet the sampling interval, and data length is the requirement of 24Bit.According to
5 channel acquisition calculate, and 2GB memory capacity can meet four component VSP during drilling survey tools and work continuously required storage in 200 hours
Space.
8, data high-speed playback
When VSP during drilling measures system for field application, it is desirable to the data of quick-downloading downhole tool storage after trip-out, enter in time
Line speed Modifying model and data process, and bit location are marked on seismic profile, provide decision-making to depend on for drilling engineer
According to.The VSP data capacity gathered due to down-hole is relatively big, and therefore, data readback speed is particularly important, conventional with the data boring instrument
Download interface generally uses RS485 bus, and its message transmission rate is relatively low, and the time obtaining data needs is longer, thus
Affect drillng operation progress.And USB2.0 interface is a kind of to apply the new interface technology in computer realm, there is transmission speed
Faster, theoretical transmission speed is 12Mbps to degree, supports hot plug and connects the feature of multiple equipment, the most outside all kinds of
Portion's equipment is used widely.In order to improve data speed of download to greatest extent, the present invention utilizes USB to turn SPI interface electricity
Road directly reads memory data by spi bus, and without digital signal controller transfer, it is achieved that Large Copacity VSP number
According to high-speed downloads.
As shown in figure 15, the data readback circuit of present invention design specifically includes that FPGA controller, two panels 512KB
SRAM, USB2.0 controller CY7C68013A, SPI interface, 48MHz crystal oscillator and computer etc..Data readback speed can reach
32MB per second, FPGA controller is for reading the data of mass data storage circuit, and is cached in the SRAM of 512KB, two
Sheet SRAM, as data FIFO, is i.e. sent to ground by USB2.0 chip CY7C68013A after a piece of SRAM storage is full and calculates
Machine, fpga chip then continues to read memorizer be cached to other a piece of SRAM memory, after storage is full same by
USB2.0 chip CY7C68013A is sent to ground-based computer.Two panels SRAM works with " table tennis " operator scheme, is greatly improved
Data transmission bauds.
Below in conjunction with Figure 16, the concrete program circuit of data high-speed downloads is described in detail.After powering on, FPGA is solid
First part framework arranges all internal state variable, then calls user's initialization function TD_Init ().After to be returned, firmware
Framework will initialize USB interface becomes the state not configured, and enables interruption.Now, and then in 1s, firmware is opened
Starting weight enumerates (ReNumerate), and starts task distributor, and this task distributor will perform following with being sequentially repeated
Work.
1) poll function TD Poll () is called.
2) Standard Device request has been detected whether, if receive SETUP bag.If it has, it will resolve received life
Order request is also responded, if transmission data command, FPGA controller will carry out FIFO read-write operation to SRAM.
3) decide whether to report that USB hangs up event.If USB to be reported hangs up event, then call function TD_Suspend,
If successfully returning, then test wake events.If being not detected by wake events, it will put into suspending mode FPGA controller
In.When reply event is detected, function TD_Resume (), and rebound step 1 will be called).
Below the concrete program state of data high-speed downloads is described in detail.FPGA controller read-write SRAM's
As shown in figure 17, fifo interface data output that difference is corresponding controls program state figure and fifo interface data input and control.
1) fifo interface data output routine flow process
IDLE: event of reading produces, and enters STATE1；STATE1: enable SLCS, determines and reads address, if FIFO is non-from FIFO
Sky, is ensureing after fifo address the most stably 25ns occurs, is entering STATE2, otherwise rest on STATE1；STATE2: time delay
After one clock cycle, enable SLOE, the data in internal FIFO are driven on data/address bus, enter STATE3；STATE3:
After one clock cycle of time delay, enable WRREQ, the data on data/address bus are write in Ping-pong FIFO, enters STATE4；
After one clock cycle of STATE4: time delay, enabling SLRD, SLRD signal to ensure the time of setting up and retention time requirement simultaneously,
It is driven on data/address bus at the data fifo delaying next address through tXFD, enters STATE5；STATE5: if still
Have data to read, enter STATE2, otherwise enter IDLE.
2) fifo interface data entry program flow process
IDLE: event of writing produces, and enters STATE1；STATE1: enable SLCS, determine from fifo address, if FIFO is non-full,
After ensureing that EZ-USB fifo address the most stably 25ns occurs, enter STATE2, otherwise rest on STATE1；STATE2: prolong
Time one clock cycle after, enable RDREQ, drive in the data to data bus in Ping-pong FIFO, and ensure the minimum of tSFD
Requirement, enters STATE3；After 2 clock cycle of STATE3: time delay, enabling SLWR, ensure SLWR signal sets up the time simultaneously
With retention time requirement, at the rising edge of IFCLK, data are written into from FIFO, and the flag bit of FIFO is through tXFLG time delay
After be updated, enter STATE4；STATE4: if submitting to from last group data that the data of FIFO are Ping-pong FIFO, then
Enabling PKTEND, simultaneously under conditions of meeting its foundation, retention time, the rising edge at IFCLK submits to last to organize data,
Enter STATE5；STATE5: if still having data to read, entering STATE2, otherwise entering IDLE.
Specific embodiment described herein is only to present invention spirit explanation for example.Technology neck belonging to the present invention
Described specific embodiment can be made various amendment or supplements or use similar mode to replace by the technical staff in territory
Generation, but without departing from the spirit of the present invention or surmount scope defined in appended claims.
Although the most more employing the borehole wall 101, data carriers 102, VSP survey tool the 103, first bed boundary
104, the second bed boundary 105, focus 106, terrestrial clock synchronizer 107, direct wave the 108, first echo 109, second
Echo 110, VSP coupling coil 301, signal transmission circuit 302, the first hydrophone 303, data communication mouth 304, precision interval clock
Assembly 305, down-hole governor circuit 306, Z axis cymoscope 307, X-axis cymoscope 308, battery sleeve 309, the second hydrophone 310, seat
Mechanism for card 311, signal receiving circuit 312, data storage circuitry 313, signal acquisition circuit 314, Y-axis cymoscope 315, measurement are visited
501, structure 502, retaining ring 503, cymoscope 504, holding wire 505, sensor fixing body 506, fuel tank 701, electromagnetism are sealed
Valve 702, push action cylinder 703, backup block 704, overflow valve 705, check valve 706, oil pump 707, brushless electric machine 708, VSP measure
Tool body 801, slurry channel 802, VSP side coupling coil 803, carry side guiding surface 804, VSP side guiding surface 805,
Floating drum 806, control storage circuit 807, carrying device coupling coil 808, magnet 809, Hall element 810, rod-like body
811, dock the terms such as chamber 812, but be not precluded from using the probability of other term.These terms are used to be only used to more square
Just the essence of the present invention is described and explained；Being construed as any additional restriction is all to disagree with spirit of the present invention
The back of the body.
Claims (10)
1. a VSP during drilling measures clock system, it is characterised in that including: ground synchronous device, underground synchronous device,
Energy source synchronizer, wherein:
Described ground synchronous device receives the synch command of user, whole moment second start or terminate with underground synchronous device same
Step operation；
Described energy source synchronizer produces pulse triggering signal, and in the rising edge time triggering focus control of pulse triggering signal
Device is blown out；
The rising edge of a pulse moment of pulse triggering signal when described ground synchronous device real time record is blown out, and pulse is risen
Along the moment according to blow out order preserve into the file with time marking；
Downhole instrument acquisition scans signal, and store into the digital waveform file with time marking.
A kind of VSP during drilling the most according to claim 1 measures clock system, it is characterised in that:
Described energy source synchronizer includes that coding unit and decoding unit, described coding unit are connected with ground synchronous device；Institute
State decoding unit be positioned at focus side and with coding unit communication；
Described underground synchronous device is positioned in VSP survey tool, for reference and keeps same with the signal of ground synchronous device with it
Step；
Described ground synchronous device includes GPS reference clock source.
A kind of VSP during drilling the most according to claim 2 measures clock system, it is characterised in that during described GPS reference
Zhong Yuan includes: digital signal processor, and be connected with digital signal processor GPS time service module, nonvolatile memory cell,
The output of LCD MODULE, lock-out pulse, triggering detecting signal unit, button detector unit, communication interface and power circuit.
A kind of VSP during drilling the most according to claim 1 measures clock system, it is characterised in that described focus synchronizes
Device uses 4 line systems to be connected with energy source controller, wherein start pulse signal and GND mono-group, and scanning signal and GND are one group,
Often group signal uses a pair twisted-pair feeder, two groups of holding wires to be bare wire, connected by adapter.
A kind of VSP during drilling the most according to claim 1 measures clock system, it is characterised in that also include time school
Equipment, described time correction device includes the control storage circuit for storing temporal information, for measuring work with down-hole VSP
Tool carries out the coupling coil of data interaction, and floating drum.
6. a VSP during drilling measures clock synchronizing method, it is characterised in that including: ground synchronous device, underground synchronous device,
Energy source synchronizer, wherein:
Described ground synchronous device receives the synch command of user, whole moment second start or terminate with underground synchronous device same
Step operation；
Described energy source synchronizer produces pulse triggering signal, and in the rising edge time triggering focus control of pulse triggering signal
Device is blown out；
The rising edge of a pulse moment of pulse triggering signal when described ground synchronous device real time record is blown out, and pulse is risen
Along the moment according to blow out order preserve into the file with time marking；
Downhole instrument acquisition scans signal, and store into the digital waveform file with time marking.
A kind of VSP during drilling the most according to claim 6 measures clock synchronizing method, it is characterised in that
Described energy source synchronizer includes that coding unit and decoding unit, described coding unit are connected with ground synchronous device；Institute
State decoding unit be positioned at focus side and with coding unit communication；
Described underground synchronous device is positioned in VSP survey tool, for reference and keeps same with the signal of ground synchronous device with it
Step；
Described ground synchronous device includes GPS reference clock source.
A kind of VSP during drilling the most according to claim 6 measures clock synchronizing method, it is characterised in that during described GPS reference
Zhong Yuan includes: digital signal processor, and be connected with digital signal processor GPS time service module, nonvolatile memory cell,
The output of LCD MODULE, lock-out pulse, triggering detecting signal unit, button detector unit, communication interface and power circuit.
A kind of VSP during drilling the most according to claim 6 measures clock synchronizing method, it is characterised in that described focus synchronizes
Device uses 4 line systems to be connected with energy source controller, wherein start pulse signal and GND mono-group, and scanning signal and GND are one group,
Often group signal uses a pair twisted-pair feeder, two groups of holding wires to be bare wire, connected by adapter.
A kind of VSP during drilling the most according to claim 6 measures clock synchronizing method, it is characterised in that also include time school
Equipment, described time correction device includes the control storage circuit for storing temporal information, for measuring work with down-hole VSP
Tool carries out the coupling coil of data interaction, and floating drum.
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| 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 |
| CN109031406A (en) * | 2018-08-06 | 2018-12-18 | 中国科学院地质与地球物理研究所 | A kind of rifle control markers machine |
| 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 |
| CN109611075A (en) * | 2018-11-02 | 2019-04-12 | 贝兹维仪器(苏州)有限公司 | A kind of real-time clock synchronization system and well logging device |
| CN110939437A (en) * | 2019-12-16 | 2020-03-31 | 北京港震科技股份有限公司 | Underground data acquisition device and system |
| CN112147924A (en) * | 2020-08-27 | 2020-12-29 | 航天东方红卫星有限公司 | High-precision program-controlled task management system |
| WO2022126716A1 (en) * | 2020-12-18 | 2022-06-23 | 中国科学院地质与地球物理研究所 | Synchronization method for measure while drilling system |
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| 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 |
| CN108535772B (en) * | 2018-07-04 | 2024-05-24 | 吉林大学 | Compensation method and device for time synchronization of underground multi-node acquisition system |
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| CN109031406B (en) * | 2018-08-06 | 2020-04-14 | 中国科学院地质与地球物理研究所 | A gun control time scale machine |
| 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 |
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| CN110939437A (en) * | 2019-12-16 | 2020-03-31 | 北京港震科技股份有限公司 | Underground data acquisition device and system |
| CN112147924A (en) * | 2020-08-27 | 2020-12-29 | 航天东方红卫星有限公司 | High-precision program-controlled task management system |
| WO2022126716A1 (en) * | 2020-12-18 | 2022-06-23 | 中国科学院地质与地球物理研究所 | Synchronization method for measure while drilling system |
| US12241368B2 (en) | 2020-12-18 | 2025-03-04 | Institute Of Geology And Geophysics, Chinese Academy Of Sciences | Synchronization method for an MWD mud pulse telemetry system |
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