CN104265278B - A kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging - Google Patents
A kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging Download PDFInfo
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- CN104265278B CN104265278B CN201410371226.2A CN201410371226A CN104265278B CN 104265278 B CN104265278 B CN 104265278B CN 201410371226 A CN201410371226 A CN 201410371226A CN 104265278 B CN104265278 B CN 104265278B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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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
- E21B47/14—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 using acoustic waves
- E21B47/18—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Acoustics & Sound (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging, comprise the following steps：1) ambient noise is filtered with FIR low pass filter, wherein, the FIR low pass filter arrange parameter includes filter type, sample frequency, stopband and band connection frequency, ripple factor；2) Pump Impulse Noise is eliminated with sef-adapting filter, wherein, by the use of pump rush sensor collection signal as the sef-adapting filter input, and the noise that slush pump is produced is regarded as the echo formed after mud channel distortion by pump stroke signal, filter coefficient is constantly adjusted using value of feedback, the output similar to Pump Impulse Noise is produced, is added by with the reverse of primary signal, and then eliminate influence of the Pump Impulse Noise to signal.The present invention eliminates Pump Impulse Noise to being input into the signal containing Pump Impulse Noise using echo cancellation technology, makes the quality of the measurement signal that well logging obtains and is improved.
Description
Technical field
Technical field the present invention relates to eliminate Pump Impulse Noise in well logging, refers in particular to a kind of using cancelling out echo skill
The method that art eliminates the Pump Impulse Noise in well logging.
Background technology
Wireless drilling logging system is a kind of logging mode for generally using in drilling well in the world at present.It can be in drilling well
While operation, geologic parameter, well track parameter are measured in real time, and draw various types of logs, be that next step is applied
Work provides foundation.
As shown in figure 1, the operation in conventional drilling facility is illustrated, it is as follows：
Mud 10 is extracted out from mud pit 11 by one or more slush pumps 12, and slush pump used is typically piston reciprocating
Pump.Mud 10 reaches drill string 14, by drill bit 15, through the annular space 16 between drilling rod and open hole wall 29 by mud line 13
Earth's surface is returned to, a circulation is completed.After returning to earth's surface 31, mud returns to mud pit 11 and completes rock wherein by pipeline 17
The precipitation of drilling cuttings or its chip, then re-starts circulation.
One pressure pulse signal equipment 18 is integrated in drill string to transmit the drill-well operation obtained by measuring instrument 19
In data-signal.Pressure pulse signal equipment 18 contains valve or reducing hole, and it can be produced by adjusting mud speed rate
Raw pressure pulse.The coded system on demand of measuring instrument 19 to data signals, then control pressure pulse signal equipment
18, the pressure pulse of measurement data is carried so as to be produced in slurry liquid.Arrow 21,22 and 23 illustrates pressure pulse signal and sets
The route of transmission of standby 18 pulse signals produced under the conditions of conventional well.Slush pump 12 can equally be produced in mud line 13
Pressure pulse, this is identified in figure by arrow 24,25,26 and 26A, and wherein 26A equally identifies stream of the mud in annular space 16
It is dynamic.
In order to realize the correct parsing of bottom pressure pulse, it is necessary to removed by some way or effectively eliminate slush pump
The pressure pulse of generation.Subsystem 30 includes pressure sensor 32, pump rush sensor 34 and computer or processor 36 etc., carries
The method for having supplied to solve this problem, and present invention application echo cancellation technology eliminates the pressure pulse that slush pump is produced.
As shown in Fig. 2 the generation of drilling well signal, transmission and reception process are illustrated, it is as follows：
Wireless drilling logging system gathers required measurement signal by inserting tube, then these measurement signals are advised according to coding
Then encoded, drive pulse signal equipment produces corresponding pulse signal afterwards；These are being contained well logging letter by mud channel
The pressure pulse signal of breath is transferred to well head, and pressure signal converted electrical number is transmitted to collection plate by the pressure sensor of well head,
After carrying out digital-to-analogue conversion, it is transmitted to host computer and is decoded and follow-up calculating.
The useful logging signal for transmitting not only is included by the signal of mud transmission, also mud is compressed including slush pump
The pressure pulse (i.e. Pump Impulse Noise) that causes of slurry, and the pressure oscillation that causes of other various machineries and random noise etc., these
Noise is referred to as ambient noise.Drilling well signal is disturbed by ambient noise, increases the bit error rate, and it is accurate that influence data are decoded
Property.Generally, due to the frequency of Pump Impulse Noise and signal is approached, both blend together, and are difficult with the method for linear filtering
The elimination of Pump Impulse Noise is realized, and applies echo cancellation technology, using pump stroke signal as input, by the work of sef-adapting filter
With, an output signal similar with pump stroke signal is produced, the output of sef-adapting filter is subtracted from primary signal, so as to reach
To the purpose for eliminating the Pump Impulse Noise in signal, the bit error rate is reduced.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art and shortcoming, there is provided one kind is efficient, reliably utilize echo
The method that cancellation technology eliminates the Pump Impulse Noise in well logging, can be obviously improved signal quality, be easy at follow-up decoding
Reason.
To achieve the above object, technical scheme provided by the present invention is：One kind is eliminated with brill using echo cancellation technology
The method of the Pump Impulse Noise in well logging, comprises the following steps：
1) ambient noise is filtered with FIR low pass filter, wherein, the FIR low pass filter arrange parameter
Including filter type, sample frequency, stopband and band connection frequency, ripple factor；
2) Pump Impulse Noise is eliminated with sef-adapting filter, wherein, the signal gathered using pump rush sensor is made
It is the input of the sef-adapting filter, and the noise that slush pump is produced is regarded by pump stroke signal as the shape after mud channel distortion
Into echo, constantly adjust filter coefficient using value of feedback, produce the output similar to Pump Impulse Noise, by with primary signal
Reverse addition, and then eliminate influence of the Pump Impulse Noise to signal.
The adaptive algorithm that the sef-adapting filter is used is as follows：
Y (n)=wH(n)x(n)；
E (n)=d (n)-y (n)；
W (n+1)=w (n)+2 × u × e (n) × x (n)；
In formula, w (n) is tap coefficient, and x (n) is pump stroke signal, and y (n) is output result, and d (n) is mud pulse signal,
E (n) is error, and u is adjusting step；If it is known that the priori of tap weights vector, then select the initial value of w (n) with it, it is no
Then w (n)=0；
Wherein, according to adaptive algorithm, mud pulse signal d (n) is believed by the FIR low pass filter as input
Number, subtract each other by output signal y (n) that the sef-adapting filter is obtained with pump stroke signal x (n), error amount e (n) is obtained, with
The coefficient of this adjustment wave filter, and then the output valve of wave filter is constantly adjusted, the pump impulse being steadily decreasing in input signal is made an uproar
Sound, constantly changes the coefficient of wave filter, by the repetition of above procedure, the final purpose for realizing eliminating Pump Impulse Noise.
The ambient noise includes torque noise, Pump Impulse Noise, drill bit noise.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, because the frequency of Pump Impulse Noise and signal is approached, both are blended together, and reality is difficult with the method for linear filtering
The elimination of existing Pump Impulse Noise, and echo cancellation technology is applied, using pump stroke signal as input, by the work of sef-adapting filter
With, an output signal similar with pump stroke signal is produced, the output of sef-adapting filter is subtracted from primary signal, so as to reach
To the purpose for eliminating the Pump Impulse Noise in signal, the bit error rate is reduced.
2nd, the inventive method is applied in the transmission and encoding and decoding of the mud pulse signal in oil drill rod telemetry system, is used
To reduce because of the bit error rate that Pump Impulse Noise causes, improve received signal quality, while Pump Impulse Noise is filtered, will not be by signal
Distortion, further increases precision and effect, improves the channel quality of whole system, is easy to follow-up decoding process.
Brief description of the drawings
Fig. 1 is the operation schematic diagram in conventional drilling facility.
Fig. 2 is drilling measuring signal flow graph.
Fig. 3 is the parameter setting interface of FIR low pass filter of the present invention.
Fig. 4 is the echo cancellation algorithm explanatory diagram of the inventive method.
Specific embodiment
With reference to specific embodiment, the invention will be further described.
The method that utilization echo cancellation technology described in the present embodiment eliminates the Pump Impulse Noise in well logging, its specific feelings
Condition is as follows：
1) ambient noise (including torque noise, Pump Impulse Noise, drill bit noise etc.) is filtered with FIR low pass filter
Ripple, wherein, the FIR low pass filter arrange parameter includes filter type, sample frequency, stopband and band connection frequency, ripple
Coefficient etc., as shown in Figure 3.
2) Pump Impulse Noise is eliminated with sef-adapting filter, wherein, the signal gathered using pump rush sensor is made
It is the input of the sef-adapting filter, and the noise that slush pump is produced is regarded by pump stroke signal as the shape after mud channel distortion
Into echo, constantly adjust filter coefficient using value of feedback, produce the output similar to Pump Impulse Noise, by with primary signal
Reverse addition, and then eliminate influence of the Pump Impulse Noise to signal.
In the present embodiment, the adaptive algorithm that the sef-adapting filter is used is as follows：
Y (n)=wH(n)x(n)；
E (n)=d (n)-y (n)；
W (n+1)=w (n)+2 × u × e (n) × x (n)；
In formula, w (n) is tap coefficient, and x (n) is pump stroke signal, and y (n) is output result, and d (n) is mud pulse signal,
E (n) is error, and u is adjusting step；If it is known that the priori of tap weights vector, then select the initial value of w (n) with it, it is no
Then w (n)=0.
As shown in figure 4, according to adaptive algorithm, using mud pulse signal d (n) by the FIR low pass filter as
Input signal, subtracts each other with pump stroke signal x (n) by output signal y (n) that the sef-adapting filter is obtained, and obtains error amount e
N (), the coefficient of wave filter is adjusted with this, and then constantly adjust the output valve of wave filter, is steadily decreasing in input signal
Pump Impulse Noise, constantly changes the coefficient of wave filter, by the repetition of above procedure, the final mesh for realizing eliminating Pump Impulse Noise
's.
In sum, after using above scheme, the inventive method can effectively eliminate Pump Impulse Noise, obtain well logging
The quality of measurement signal improved, reduce because of the bit error rate that Pump Impulse Noise causes.This is solved linear compared to existing technology
The problem of the elimination of the method for filtering Pump Impulse Noise difficult to realize, reduces the bit error rate, received signal quality is improved, after being easy to
Continuous decoding process, in the transmission and encoding and decoding of the particularly suitable mud pulse signal in oil drill rod telemetry system, for subtracting
Less because of the bit error rate that Pump Impulse Noise causes, it is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiments of the invention, not limit implementation model of the invention with this
Enclose, therefore the change that all shapes according to the present invention, principle are made, all should cover within the scope of the present invention.
Claims (2)
1. a kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging, it is characterised in that including following
Step：
1) ambient noise is filtered with FIR low pass filter, wherein, the FIR low pass filter arrange parameter includes
Filter type, sample frequency, stopband and band connection frequency, ripple factor；
2) Pump Impulse Noise is eliminated with sef-adapting filter, wherein, the signal by the use of pump rush sensor collection is used as institute
The input of sef-adapting filter is stated, and the noise that slush pump is produced is regarded as what is formed after mud channel distortion by pump stroke signal
Echo, filter coefficient is constantly adjusted using value of feedback, the output similar to Pump Impulse Noise is produced, by anti-with primary signal
To addition, and then eliminate influence of the Pump Impulse Noise to signal；
The adaptive algorithm that the sef-adapting filter is used is as follows：
Y (n)=wH(n)x(n)；
E (n)=d (n)-y (n)；
W (n+1)=w (n)+2 × u × e (n) × x (n)；
In formula, w (n) is tap coefficient, and x (n) is pump stroke signal, and y (n) is output result, and d (n) is mud pulse signal, e (n)
It is error, u is adjusting step；If it is known that the priori of tap weights vector, then select the initial value of w (n), otherwise w with it
(n)=0；
Wherein, according to adaptive algorithm, using mud pulse signal d (n) by the FIR low pass filter as input signal,
Subtract each other by output signal y (n) that the sef-adapting filter is obtained with pump stroke signal x (n), obtain error amount e (n), with this
The coefficient of wave filter is adjusted, and then constantly adjusts the output valve of wave filter, be steadily decreasing the Pump Impulse Noise in input signal,
The coefficient of wave filter is constantly changed, by the repetition of above procedure, the final purpose for realizing eliminating Pump Impulse Noise.
2. the method that a kind of utilization echo cancellation technology according to claim 1 eliminates the Pump Impulse Noise in well logging,
It is characterized in that：The ambient noise includes torque noise, Pump Impulse Noise, drill bit noise.
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| CN201410371226.2A CN104265278B (en) | 2014-07-30 | 2014-07-30 | A kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging |
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| CN201410371226.2A CN104265278B (en) | 2014-07-30 | 2014-07-30 | A kind of method that utilization echo cancellation technology eliminates the Pump Impulse Noise in well logging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107905781B (en) * | 2015-04-23 | 2021-01-15 | 宋协翠 | Mechanical equipment for drilling engineering |
| CN105041304B (en) * | 2015-07-27 | 2017-09-26 | 电子科技大学 | Pump impulse interfering signal removing method based on two-dimensional dct |
| CN105041303B (en) * | 2015-07-27 | 2018-10-02 | 电子科技大学 | The pump impulse interfering signal removing method of drilling fluid following drill data transmission system |
| CN105525916B (en) * | 2016-01-07 | 2018-05-25 | 陕西师范大学 | A kind of active noise fracturing effect detection method |
| CN106089188B (en) * | 2016-06-02 | 2019-02-26 | 中国石油大学(华东) | A kind of real-time minimizing technology of mud pulse signal pump noise |
| US9850754B1 (en) * | 2016-06-17 | 2017-12-26 | Ge Energy Oilfield Technology, Inc. | High speed telemetry signal processing |
| CN106321080B (en) * | 2016-09-13 | 2019-04-09 | 中国石油大学(华东) | A kind of processing method with brill mud continuous-wave pulse signal |
| CN110924940B (en) * | 2019-12-17 | 2021-09-07 | 电子科技大学 | Self-adaptive prediction elimination method and device for pump noise of MWD system |
| CN111308560B (en) * | 2019-12-18 | 2021-06-04 | 中国海洋石油集团有限公司 | Method and device for eliminating noise of MWD (measurement while drilling) system |
| CN116150587B (en) * | 2023-02-14 | 2023-09-29 | 中国科学院地质与地球物理研究所 | Noise reduction measurement method for while-drilling acoustic data based on signal synchronization |
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| US5150333A (en) * | 1977-12-05 | 1992-09-22 | Scherbatskoy Serge Alexander | Method and apparatus for providing improved pressure pulse characteristics for measuring while drilling |
| US5146433A (en) * | 1991-10-02 | 1992-09-08 | Anadrill, Inc. | Mud pump noise cancellation system and method |
| BR0106104B1 (en) * | 2000-05-08 | 2013-08-06 | Method for noise reduction in a measured telemetry signal | |
| US8593216B2 (en) * | 2006-06-30 | 2013-11-26 | Qualcomm Incorporated | Loop filter with noise cancellation |
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