CN109653734A - A kind of multi-parameter measurement while drilling information ground receiving system and method - Google Patents
A kind of multi-parameter measurement while drilling information ground receiving system and method Download PDFInfo
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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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- 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
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Abstract
The present invention relates to a kind of multi-parameter measurement while drilling information ground receiving system and methods.Its technical solution is: acquisition module is connected to signal pre-processing module, signal pre-processing module is connected to analog-to-digital conversion module, analog-to-digital conversion module is connected to main control module, main control module top connects TFT display screen, the right side of main control module connects industrial personal computer, industrial personal computer lower part connects measuring instrument test setting module, the lower part of measuring instrument test setting module connects downhole instrument, power supply is connected on the left of measuring instrument test setting module, acquisition module, signal pre-processing module, analog-to-digital conversion module and main control module are connected respectively to power module.The beneficial effects of the present invention are: acquisition and identification that the present invention can effectively solve the problems, such as the more measurement parameter signals in underground caused by the factors such as Complex Noise signal and drilling depth are, it can be achieved that high weak signal reception and the integrated data processing made an uproar under environment.
Description
Technical field
The present invention relates to a kind of measurement-while-drilling system and method, in particular to a kind of multi-parameter measurement while drilling information ground connects
Receive system and method.
Background technique
With deepening continuously for oil field prospecting, the exploitation difficulty of oil reservoir is also increasing, and the exploitation of especially original oil zone is got over
Come more difficult, in order to further increase production efficiency, improves the Drilling ratio of oil reservoir, Geosteering Drilling Technology is obtained promoting and be answered
With.Now for scale exploitation self-contained oil field it is few in number, difficulty employ remaining reserves with " thin, thick, low, disconnected, depth, side,
It is small " it is almost the spies such as super-viscous oil, special thick oil, hyposmosis, complex fault block, deep layer, complex reservoir entirely based on oil reservoir and block
Different type oil reservoir, development difficulty are very big.Due in original oil zone, difficulty employs that reservoir area is wide, and remaining reserves are abundant, thus old oil
The development and utilization of area's difficult-to-produce reserves residue oil reservoir become the key point of oilfield stable production synergy, need to widely popularize horizontal well comprehensive
Geosteering is closed to improve the Drilling ratio of oil reservoir, improves the production efficiency of petroleum.
In with brill geosteering measuring system, it usually needs while multiple geology and engineering parameter are measured, including measurement
Resistivity, gamma, annular pressure, overpressure, hole deviation, orientation, tool-face, the temperature etc. of point, this just needs ground receiver system
System enhances the timeliness and reliability to measuring multiple parameters, while being continuously increased with drilling depth, the brill that ground receiver arrives
Well liquid pulse signal becomes weak signal, carries out in the presence of the weak signals such as deep-well so that ground receiving system needs to meet
Work.
Summary of the invention
The purpose of the present invention is to drawbacks described above of the existing technology, provide a kind of multi-parameter measurement while drilling information
Ground receiving system and method can effectively solve the more measurement parameters in underground caused by the factors such as Complex Noise signal and drilling depth
Acquisition and the identification problem of signal are, it can be achieved that high weak signal reception and the integrated data processing made an uproar under environment.
Its technical solution is: including acquisition module, signal pre-processing module, analog-to-digital conversion module, power module, measuring instrument
Device test setting module, main control module, industrial personal computer, acquisition module are connected to signal pre-processing module, and signal pre-processing module connects
It is connected to analog-to-digital conversion module, analog-to-digital conversion module is connected to main control module, and main control module top connects TFT display screen, master control mould
The right side of block connects industrial personal computer, and industrial personal computer lower part connects measuring instrument test setting module, measuring instrument test setting module
Lower part connects downhole instrument, is connected to power supply, acquisition module, Signal Pretreatment mould on the left of measuring instrument test setting module
Block, analog-to-digital conversion module and main control module are connected respectively to power module.
Preferably, acquisition module includes pressure sensor, hook set sensor, depth transducer and security isolation grid, pressure
Sensor, hook set sensor, depth transducer are in parallel with security isolation grid, and pressure sensor acquires original burst signal, and hook carries
The variation of sensor and depth transducer acquisition suspending weight and tracking depths, security isolation grid realize the explosion prevention function of acquisition module,
Enter in terrestrial interface case by the current signal of guard grating.
Preferably, signal pre-processing module includes current-to-voltage convertor, filter module, signal amplifier, Current Voltage
Conversion is connected to filter module, and filter module is connected to signal amplifier, and signal is converted by current-to-voltage convertor, filters mould
Block is program switch capacitive filter MAX260, and low-pass filtering cutoff frequency is set as 5Hz, and signal amplifier is LT5400 amplification
Device is used cooperatively with filter module.
Preferably, the AD7864 analog-to-digital conversion that analog-to-digital conversion module is efficiently sampling digit 12, maximum conversion time
1.65 μ s, meet 0-5V configuration, and power module pulse width is (PWM) formula 24V120W power supply.
Preferably, measuring instrument test setting module by bus communication realize to instrument test under drilling well and setting,
Including pulser control module, inserting tube, resistivity and gamma pipe nipple.
Preferably, main control module is the control framework of " EP3C5E144C8+ TMS320F2812 ", with 32 latches
Device and 32 bit registers store data, the control command that TMS320F2812 sends acquisition and latches, complete with
SPI communication between EP3C5E144C8, main control module are communicated with industrial personal computer, the biography of data needed for realizing signal processing module
Defeated, main control module is communicated with long-range driller's display, realizes long-range department's display function, and hook set sensor and depth transducer acquisition are big
The variation of hook load and depth, main control module carry out data processing, are carried by hook and the variation of depth data is obtained with drilling depth.
Preferably, interface box acquires drilling fluid pulse by first pressure sensor interface and second pressure sensor interface
Signal acquires hook load signal by hook set sensor interface, passes through the first well depth interface and the second well depth interface production wells
Deep data realize the setting of resistivity gamma instrument test by middle control read-write interface, realize long-range department by remotely taking charge of aobvious interface
Display function passes through the 2nd COM by the first com port and USB port and industrial computer communication by taking charge of aobvious interface realization department display function
The existing test setting to orientation inserting tube of cause for gossip.
A kind of method for multi-parameter measurement while drilling information ground receiving system that the present invention mentions are as follows:
Industrial personal computer realizes that signal processing and instrument test setting, signal pre-processing module are used and be based on by connecting with interface box
The Wavelet Entropy of empirical mode decomposition (EMD) denoises and more bit recognition methods based on characteristic matching are realized, based on empirical modal point
The Wavelet Entropy denoising method of solution (EMD) can reach denoising on finer scale, and step 1 divides measuring signal using EMD
Solution, decomposite 8 frequencies IMF component from high to low and with 1 residual components, and select Symlet wavelet function symN (N=
4 ..., 8) it is used as basic function；Step 2 obtains each scale detail coefficients and approximation coefficient to IMF component multi-scale wavelet decomposition；Step
Rapid 3 utilize Wavelet packet threshold approach for denoising by the noise remove in noisy IMF1 ~ IMF5 component, take the maximum area of small echo entropy
Between noise variance of the high-frequency wavelet coefficient average value as the scale, substitute into formula,
Obtain the corresponding threshold value of the scale；Recycle formula, to new
Detail coefficients carry out threshold value quantizing processing, obtain approximate high-frequency wavelet coefficient, with step 2 decomposition obtain it is top approximate
Coefficient reconstructs the IMF component after being denoised；Step 4: again with EMD method by the IMF after wavelet entropy threshold denoises points
Measure reconstruction signal, the signal after being denoised.
Preferably, more bit recognition methods based on characteristic matching, in a bit period signal from high to low
Jump is 1, and jump from low to high is 0, and the signal characteristic of single-bit is combined by the foundation of more bit signal features,
The identification of more bit signals is carried out by Pattern similarity between calculating measured signal and standard signal, it is preferential using similarity
Principle determines the similitude between measured signal and standard feature, and more bits are identified using angle similarity function measurement method
The drilling fluid pulse signal in period defines two vectors,,
Pattern similarity is, in the waveform recognition of more bit periods, the feature vector of standard feature model is X, is passed through
The feature vector of drilling fluid pulse data after acquisition filtering in real time is Y, according to formulaInto
The calculating of the corresponding similarity of row, in formula,,。
The beneficial effects of the present invention are: the present invention can be solved effectively caused by the factors such as Complex Noise signal and drilling depth
Acquisition and the identification problem of the more measurement parameter signals in underground are, it can be achieved that at the high weak signal reception and integrated data made an uproar under environment
Reason.Present invention has the main advantage that providing a kind of multi-parameter measurement while drilling information ground receiving system, which passes through mould
Blockization design realizes that the function of explosion-proof interface box is integrated, for weak signal using LT5400 amplifier and low-pass filter MAX260
It is used in combination, guarantees lesser matching error, AD7864 high-speed low-consumption analog-to-digital conversion and low ripple power module guarantee lower electricity
Road system interference, main control module improve the original letter of acquisition using the control framework of " EP3C5E144C8+ TMS320F2812 "
The precision of number feature guarantees precision identify based on signal characteristic, realizes TFT display screen digital display hook load, well depth and signal wave
Shape is realized using the Wavelet Entropy algorithm based on empirical mode decomposition (EMD) and more bit recognition methods based on characteristic matching
Height is made an uproar weak signal reception and integrated data processing under environment.
Detailed description of the invention
Fig. 1 is principle schematic diagram of the invention；
Fig. 2 is Signal Pretreatment and analog-to-digital conversion schematic illustration of the invention；
Fig. 3 is middle control modular structure schematic illustration of the invention；
Fig. 4 is interface box interface connection schematic diagram of the invention；
Fig. 5 is original signal and noise cancellation signal comparison diagram of the invention；
Fig. 6 is more bit signal recognition result figures of the invention；
In figure: acquisition module 1, signal pre-processing module 2, analog-to-digital conversion module 3, power module 4, measuring instrument test setting mould
Block 5, main control module 6, industrial personal computer 7, pressure sensor 8, hook set sensor 9, depth transducer 10, security isolation grid 11, underground
Instrument 12, TFT display screen 13, current-to-voltage convertor 14, filter module 15, signal amplifier 16, long-range driller's display 17,
Interface box 18, first pressure sensor interface 19, second pressure sensor interface 20, hook set sensor interface 21, the first well depth
Interface 22, the second well depth interface 23, middle control read-write interface 24, it is long-range take charge of aobvious interface 25, take charge of aobvious interface 26, the first com port 27,
USB port 28, the second com port 29.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As shown in Figure 1, the present invention includes acquisition module 1, signal pre-processing module 2, analog-to-digital conversion module 3, power module
4, measuring instrument test setting module 5, main control module 6, industrial personal computer 7, acquisition module 1 are connected to signal pre-processing module 2, signal
Preprocessing module 2 is connected to analog-to-digital conversion module 3, and analog-to-digital conversion module 3 is connected to main control module 6, the connection of 6 top of main control module
TFT display screen 13, the right side of main control module 6 connect industrial personal computer 7, and 7 lower part of industrial personal computer connects measuring instrument test setting module 5,
The lower part of measuring instrument test setting module 5 connects downhole instrument 12, and the left side of measuring instrument test setting module 5 is connected to electricity
Source, acquisition module 1, signal pre-processing module 2, analog-to-digital conversion module 3 and main control module 6 are connected respectively to power module 4.
As shown in Figure 1, acquisition module 1 includes pressure sensor 8, hook set sensor 9, depth transducer 10 and security isolation
Grid 11, pressure sensor 8, hook set sensor 9, depth transducer 10 are in parallel with security isolation grid 11, and pressure sensor 8 acquires original
Initial pulse signal, hook set sensor 9 and depth transducer 10 acquire variation and the tracking depths of suspending weight, and security isolation grid 11 are realized
The explosion prevention function of acquisition module enters in terrestrial interface case by the current signal of guard grating.
As shown in Figure 1, measuring instrument test setting module 5 by bus communication realize to instrument test under drilling well with set
It sets, including pulser control module, inserting tube, resistivity and gamma pipe nipple.
As shown in Figure 1, digital display hook load, well depth and signal waveform are realized in main control module and the communication of TFT display screen 13.
As shown in Fig. 2, signal pre-processing module 2 includes current-to-voltage convertor 14, filter module 15, signal amplifier
16, Current Voltage conversion 14 is connected to filter module 15, and filter module 15 is connected to signal amplifier 16, and signal is through overcurrent electricity
Pressure converter 14 is converted, and filter module 15 is program switch capacitive filter MAX260, and low-pass filtering cutoff frequency is set as
5Hz, signal amplifier 16 are LT5400 amplifier, are used cooperatively with filter module 15, guarantee lesser matching error, put
It is treated as the voltage signal less than 5V greatly.
As shown in Fig. 2, the AD7864 analog-to-digital conversion that analog-to-digital conversion module 3 is efficiently sampling digit 12, maximum conversion
1.65 μ s of time, meets 0-5V configuration, and power module pulse width is (PWM) formula 24V120W power supply.
As shown in figure 3, main control module 6 is the control framework of " EP3C5E144C8+ TMS320F2812 ", EP3C5E144C8
Have the characteristics that low-power consumption, low cost and high performance, store data with 32 latch and 32 bit registers,
The control command that TMS320F2812 sends acquisition and latches, completion are communicated with the SPI between EP3C5E144C8, are used
The precision of acquisition original signal characteristic, main control module 6 can be improved in the main control module 6 of " EP3C5E144C8+ TMS320F2812 "
It being communicated with industrial personal computer 7, the transmission of data needed for realizing signal processing module, main control module 6 is communicated with long-range driller's display 17,
Realize that long-range department's display function, hook set sensor 9 and depth transducer 10 acquire the variation of hook load and depth, main control module 6
Data processing is carried out, is carried by hook and the variation of depth data is obtained with drilling depth.
As shown in figure 4, interface box 18 is acquired by first pressure sensor interface 19 and second pressure sensor interface 20
Drilling fluid pulse signal acquires hook load signal by hook set sensor interface 21, passes through the first well depth interface 22 and second
Well depth interface 23 acquires well depth data, the setting of resistivity gamma instrument test is realized by middle control read-write interface 24, by long-range
It takes charge of aobvious interface 25 and realizes that long-range department's display function passes through the first com port 27 and USB port by taking charge of aobvious 26 realization department display function of interface
28 communicate with industrial personal computer 7, realize the test setting to orientation inserting tube by the second com port 29.
As shown in figure 5, a kind of method for multi-parameter measurement while drilling information ground receiving system that the present invention mentions are as follows:
Industrial personal computer 7 realizes signal processing and instrument test setting by connecting with interface box 18.For signal processing module, adopt
It is realized with the Wavelet Entropy denoising based on empirical mode decomposition (EMD) and more bit recognition methods based on characteristic matching, based on warp
The Wavelet Entropy denoising method for testing mode decomposition (EMD) can reach denoising on finer scale, and step 1 is using EMD to measurement
Signal is decomposed, decomposite 8 frequencies IMF component from high to low and with 1 residual components, and select Symlet small echo letter
Number symN (N=4 ..., 8) is used as basic function；Step 2 to IMF component multi-scale wavelet decomposition, obtain each scale detail coefficients and
Approximation coefficient；Step 3, by the noise remove in noisy IMF1 ~ IMF5 component, takes Wavelet Entropy using Wavelet packet threshold approach for denoising
It is worth noise variance of the high-frequency wavelet coefficient average value in a maximum section as the scale, substitutes into formula (1) and be somebody's turn to do
The corresponding threshold value of scale；It recycles formula (2) to carry out threshold value quantizing processing to new detail coefficients, obtains approximate high frequency wavelet system
Number decomposes obtained top approximation coefficient with step 2 and reconstructs the IMF component after being denoised；Step 4: using EMD again
Signal of the method by the IMF component reconstruction signal after wavelet entropy threshold denoises, after being denoised.
The threshold value selection principle of use is as follows:
(1)
In formula,Indicate decomposition scale,KIt isLayer wavelet coefficient length,Be Wavelet Entropy maximum subinterval details it is thin
Several average value.
It is as follows using threshold function table:
(2)
In formula,For the wavelet coefficient after threshold process,For coefficient of wavelet decomposition,For threshold value,MIt is arbitrarily just whole
Number.WhenMWhen value is larger, which is equal to soft-threshold function, whenMWhen value is smaller, which is intended to firmly
Threshold function table embodies the flexibility of new threshold function table.
As shown in fig. 6, more bit recognition methods based on characteristic matching, signal is from high to low in a bit period
Jump be 1, and jump from low to high is 0, and the signal characteristic of single-bit is carried out group by the foundation of more bit signal features
It closes, the identification of more bit signals is carried out by Pattern similarity between calculating measured signal and standard signal, using similarity
Priority principle determines the similitude between measured signal and standard feature, mutual between the adjacent similar features of consideration that can be effective
It influences, promotes accuracy.
Identify the drilling fluid pulse signal of more bit periods using angle similarity function measurement method, define two to
Amount,, Pattern similarity is, then mode
The formula of similarity is shown in formula (3), and in the waveform recognition of more bit periods, the feature vector of standard feature model is X,
Feature vector by acquiring the drilling fluid pulse data after filtering in real time is Y, carries out corresponding similarity according to formula (3)
It calculates.
(3)
In formula,,。
The present invention can effectively solve the more measurement parameter signals in underground caused by the factors such as Complex Noise signal and drilling depth
Acquisition and identification problem, it can be achieved that high weak signal reception and the integrated data processing made an uproar under environment.Main advantages of the present invention
It is: provides a kind of multi-parameter measurement while drilling information ground receiving system, which realizes explosion-proof interface by modularized design
The function of case is integrated, is used in combination, is guaranteed lesser with low-pass filter MAX260 using LT5400 amplifier for weak signal
Matching error, AD7864 high-speed low-consumption analog-to-digital conversion and low ripple power module guarantee lower circuit system interference, main control module
Using the control framework of " EP3C5E144C8+ TMS320F2812 ", the precision of acquisition original signal characteristic is improved, guarantees base
In the precision of signal characteristic identification, TFT display screen digital display hook load, well depth and signal waveform are realized, using based on empirical modal
The Wavelet Entropy algorithm of (EMD) and more bit recognition methods based on characteristic matching are decomposed, the high weak signal made an uproar under environment is realized
Reception and integrated data processing.
The above, is only part preferred embodiment of the invention, and anyone skilled in the art may benefit
Equivalent technical solution is modified or is revised as with the technical solution of above-mentioned elaboration.Therefore, technology according to the present invention
Any simple modification or substitute equivalents that scheme is carried out, belong to the greatest extent the scope of protection of present invention.
Claims (9)
1. a kind of multi-parameter measurement while drilling information ground receiving system, it is characterized in that: including acquisition module (1), Signal Pretreatment
Module (2), analog-to-digital conversion module (3), power module (4), measuring instrument test setting module (5), main control module (6), industry control
Machine (7), acquisition module (1) are connected to signal pre-processing module (2), and signal pre-processing module (2) is connected to analog-to-digital conversion module
(3), analog-to-digital conversion module (3) is connected to main control module (6), and main control module (6) top connects TFT display screen (13), master control mould
The right side of block (6) connects industrial personal computer (7), and industrial personal computer (7) lower part connects measuring instrument test setting module (5), and measuring instrument is surveyed
The lower part for trying setup module (5) connects downhole instrument (12), is connected to power supply on the left of measuring instrument test setting module (5),
Acquisition module (1), signal pre-processing module (2), analog-to-digital conversion module (3) and main control module (6) are connected respectively to power module
(4).
2. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, acquisition module (1) includes pressure
Force snesor (8), hook set sensor (9), depth transducer (10) and security isolation grid (11), pressure sensor (8), hook, which carry, to be passed
Sensor (9), depth transducer (10) are in parallel with security isolation grid (11), and pressure sensor (8) acquires original burst signal, and hook carries
The variation of sensor (9) and depth transducer (10) acquisition suspending weight and tracking depths, security isolation grid (11) realize acquisition module
Explosion prevention function, enter in terrestrial interface case by the current signal of guard grating.
3. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, signal pre-processing module (2)
Filtering is connected to including current-to-voltage convertor (14), filter module (15), signal amplifier (16), Current Voltage conversion (14)
Module (15), filter module (15) are connected to signal amplifier (16), and signal is converted by current-to-voltage convertor (14), filtering
Module (15) is program switch capacitive filter MAX260, and low-pass filtering cutoff frequency is set as 5Hz, and signal amplifier (16) is
LT5400 amplifier is used cooperatively with filter module (15).
4. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, analog-to-digital conversion module (3) are
Efficiently sampling digit 12 AD7864 analog-to-digital conversions, maximum 1.65 μ s of conversion time meet 0-5V configuration, power module
Pulse width is (PWM) formula 24V120W power supply.
5. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, measuring instrument test setting
Module (5) is realized by bus communication to instrument test under drilling well and setting, including pulser control module, inserting tube, resistance
Rate and gamma pipe nipple.
6. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, main control module (6) are
The control framework of " EP3C5E144C8+ TMS320F2812 " stores data with 32 latch and 32 bit registers,
The control command that TMS320F2812 sends acquisition and latches, completion are communicated with the SPI between EP3C5E144C8, master control mould
Block (6) is communicated with industrial personal computer (7), and the transmission of data needed for realizing signal processing module, main control module (6) and long-range driller show
Device (17) communication, realizes long-range department's display function, and hook set sensor (9) and depth transducer (10) acquire hook load and depth
Variation, main control module (6) carry out data processing, are carried by hook and the variation of depth data is obtained with drilling depth.
7. a kind of multi-parameter measurement while drilling information ground receiving system according to claim 1, interface box (18) passes through the
One pressure sensor interface (19) and second pressure sensor interface (20) acquire drilling fluid pulse signal, pass through hook set sensor
Interface (21) acquires hook load signal, acquires well depth data by the first well depth interface (22) and the second well depth interface (23),
The setting of resistivity gamma instrument test is realized by middle control read-write interface (24), realizes long-range department by remotely taking charge of aobvious interface (25)
Display function is logical by the first com port (27) and USB port (28) and industrial personal computer (7) by taking charge of aobvious interface (26) realization department display function
News realize the test setting to orientation inserting tube by the second com port (29).
8. a kind of method of multi-parameter measurement while drilling information ground receiving system according to claim 1-7 are as follows:
Industrial personal computer (7) realizes signal processing and instrument test setting, signal pre-processing module by connecting with interface box (18)
(2) it is realized using the Wavelet Entropy denoising based on empirical mode decomposition (EMD) and more bit recognition methods based on characteristic matching, base
Denoising can be reached on finer scale in the Wavelet Entropy denoising method of empirical mode decomposition (EMD), step 1 utilizes EMD pairs
Measuring signal is decomposed, decomposite 8 frequencies IMF component from high to low and with 1 residual components, and select Symlet small
Wave function symN (N=4 ..., 8) is used as basic function；Step 2 obtains each scale details system to IMF component multi-scale wavelet decomposition
Several and approximation coefficient；Step 3, by the noise remove in noisy IMF1 ~ IMF5 component, is taken small using Wavelet packet threshold approach for denoising
Noise variance of the high-frequency wavelet coefficient average value in the maximum section of wave entropy as the scale substitutes into formula, obtain the corresponding threshold value of the scale；Recycle formula, to new
Detail coefficients carry out threshold value quantizing processing, obtain approximate high-frequency wavelet coefficient, with step 2 decomposition obtain it is top approximate
Coefficient reconstructs the IMF component after being denoised；Step 4: again with EMD method by the IMF after wavelet entropy threshold denoises points
Measure reconstruction signal, the signal after being denoised.
9. a kind of method of multi-parameter measurement while drilling information ground receiving system according to claim 8 are as follows: be based on feature
Matched more bit recognition methods, the jump from high to low of signal is 1 in a bit period, and jump from low to high
It is 0, the signal characteristic of single-bit is combined by the foundation of more bit signal features, is believed by calculating measured signal and standard
Pattern similarity carries out the identification of more bit signals between number, using similarity priority principle determines that measured signal and standard are special
Similitude between sign identifies the drilling fluid pulse signal of more bit periods using angle similarity function measurement method, fixed
Adopted two vectors,, Pattern similarity is,
In the waveform recognition of more bit periods, the feature vector of standard feature model is X, by acquiring the drilling fluid after filtering in real time
The feature vector of pulse data is Y, according to formulaCarry out the calculating of corresponding similarity, in formula,,。
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Cited By (2)
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| CN116066063A (en) * | 2021-11-29 | 2023-05-05 | 中国石油天然气集团有限公司 | Drilling tool vibration signal analysis system and method |
| CN116856920A (en) * | 2023-07-06 | 2023-10-10 | 中国科学院地质与地球物理研究所 | Application method and instrument of azimuth electromagnetic wave resistivity while drilling instrument |
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