CN112183268A - MWD mud pressure wave processing method - Google Patents
MWD mud pressure wave processing method Download PDFInfo
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- CN112183268A CN112183268A CN202010983229.7A CN202010983229A CN112183268A CN 112183268 A CN112183268 A CN 112183268A CN 202010983229 A CN202010983229 A CN 202010983229A CN 112183268 A CN112183268 A CN 112183268A
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- 238000003672 processing method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000013433 optimization analysis Methods 0.000 claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract description 7
- 238000005314 correlation function Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000007476 Maximum Likelihood Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000284 extract Substances 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/08—Feature extraction
- G06F2218/10—Feature extraction by analysing the shape of a waveform, e.g. extracting parameters relating to peaks
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
- G06F17/148—Wavelet transforms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
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Abstract
The invention provides a processing method of MWD mud pressure wave, which is characterized in that data collected by an underground drilling instrument is coded and then transmitted to the ground through the mud pressure wave, a ground system acquires a pressure wave signal through a sensor and then carries out real-time decoding, the ground system removes noise in the signal by adopting a square wave related filtering algorithm and a wavelet transform algorithm for the mud pressure wave, then carries out signal optimization analysis, and extracts the pressure wave signal according to the principle of effective rising edge judgment of pulse and maximum sliding window area; has the advantages that: the invention thoroughly filters mechanical noise, pump noise, reflection noise and other interference signals in MWD mud pressure wave, and improves the accuracy of decoding; the method has remarkable effect in the aspect of reliability of logging data, accurately processes MWD mud pressure wave signals uploaded by an underground drilling instrument in time, and improves the accuracy of oil drilling measurement.
Description
Technical Field
The invention relates to the field of petroleum drilling engineering, in particular to a method for processing MWD mud pressure waves.
Background
When the mud is transmitted to a ground system, the mud pulse transmission process is often influenced by complex measurement conditions to cause data oscillation and generate a 'burr' phenomenon. The MWD mud pressure wave signal, transmitted from downhole to the surface, is detected at the surface by a pulse pressure sensor mounted at the drilling wellhead riser, and the detected pressure wave signal typically contains a significant amount of noise.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a method for processing MWD mud pressure waves.
The new technical scheme of the invention is as follows: a processing method of MWD mud pressure wave comprises the steps of coding data collected by a downhole drilling instrument, transmitting the data to the ground through the mud pressure wave, decoding the data in real time after a ground system obtains a pressure wave signal through a sensor, removing noise in the signal by the ground system through a square wave related filtering algorithm and a wavelet transform algorithm, then performing signal optimization analysis, and extracting the pressure wave signal according to the principle that the effective rising edge of a pulse is judged and the area of a sliding window is the largest, wherein the processing method of the MWD mud pressure wave comprises the following steps:
1) establishing an MWD mud pressure wave transmission signal model:
2) and (2) extracting a useful signal from the MWD mud pressure wave signal through pump noise by combining a square wave correlation filtering algorithm, wherein the pressure wave signal is a square wave signal, and therefore, the known square wave correlation function is used for correlating with the mud pulse signal, and the correlation function is as follows:
3) analyzing the characteristic of MWD mud pressure wave transmitted underground, removing noise in the mud pressure wave by adopting a threshold denoising method based on wavelet transformation, and obtaining a threshold criterion according to a maximum likelihood principle as follows:
4) designing a signal optimization analysis algorithm according to the propagation characteristics and the source point convergence of the pressure wave signal:
signal strength can be enhanced by using an optimization analysis algorithm;
5) after filtering and denoising the MWD mud pressure wave signal, extracting the signal by a pulse recognition method: firstly, finding out extreme points, namely wave crests and wave troughs in a signal by utilizing a neighborhood difference method; secondly, judging a rising edge through a threshold value in the previously determined extreme point, and screening out a wave crest; and finally, determining the pulse position according to the maximum principle of the area in the sliding window to obtain the square wave position.
The invention has the beneficial effects that: the invention thoroughly filters mechanical noise, pump noise, reflection noise and other interference signals in MWD mud pressure wave, and improves the accuracy of decoding; the method has remarkable effect in the aspect of reliability of logging data, accurately processes MWD mud pressure wave signals uploaded by an underground drilling instrument in time, and improves the accuracy of oil drilling measurement.
Drawings
Fig. 1 is a data processing flow chart.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A processing method of MWD mud pressure wave comprises the steps of coding data collected by a downhole drilling instrument, transmitting the data to the ground through the mud pressure wave, decoding the data in real time after a ground system obtains a pressure wave signal through a sensor, removing noise in the signal by the ground system through a square wave related filtering algorithm and a wavelet transform algorithm, then performing signal optimization analysis, and extracting the pressure wave signal according to the principle that the effective rising edge of a pulse is judged and the area of a sliding window is the largest, wherein the processing method of the MWD mud pressure wave comprises the following steps:
1) establishing an MWD mud pressure wave transmission signal model:
2) and (2) extracting a useful signal from the MWD mud pressure wave signal through pump noise by combining a square wave correlation filtering algorithm, wherein the pressure wave signal is a square wave signal, and therefore, the known square wave correlation function is used for correlating with the mud pulse signal, and the correlation function is as follows:
3) analyzing the characteristic of MWD mud pressure wave transmitted underground, removing noise in the mud pressure wave by adopting a threshold denoising method based on wavelet transformation, and obtaining a threshold criterion according to a maximum likelihood principle as follows:
4) designing a signal optimization analysis algorithm according to the propagation characteristics and the source point convergence of the pressure wave signal:
signal strength can be enhanced by using an optimization analysis algorithm;
5) after filtering and denoising the MWD mud pressure wave signal, extracting the signal by a pulse recognition method: firstly, finding out extreme points, namely wave crests and wave troughs in a signal by utilizing a neighborhood difference method; secondly, judging a rising edge through a threshold value in the previously determined extreme point, and screening out a wave crest; and finally, determining the pulse position according to the maximum principle of the area in the sliding window to obtain the square wave position.
Claims (1)
1. The utility model provides a processing method of MWD mud pressure wave, data coding to the well drilling instrument collection in the pit is through mud pressure wave transmission to ground, and the ground system is decoded in real time after obtaining the pressure wave signal through the sensor, and the ground system adopts square wave correlation filtering algorithm to remove noise in the signal in combination with wavelet transform algorithm to the mud pressure wave, then carries out signal optimization analysis, judges according to the effective rising edge of pulse, the biggest principle of sliding window area draws the pressure wave signal, its characterized in that:
the MWD mud pressure wave processing method comprises the following steps:
1) establishing an MWD mud pressure wave transmission signal model:
2) and (2) extracting a useful signal from the MWD mud pressure wave signal through pump noise by combining a square wave correlation filtering algorithm, wherein the pressure wave signal is a square wave signal, and therefore, the known square wave correlation function is used for correlating with the mud pulse signal, and the correlation function is as follows:
3) analyzing the characteristic of MWD mud pressure wave transmitted underground, removing noise in the mud pressure wave by adopting a threshold denoising method based on wavelet transformation, and obtaining a threshold criterion according to a maximum likelihood principle as follows:
4) designing a signal optimization analysis algorithm according to the propagation characteristics and the source point convergence of the pressure wave signal:
signal strength can be enhanced by using an optimization analysis algorithm;
5) after filtering and denoising the MWD mud pressure wave signal, extracting the signal by a pulse recognition method: firstly, finding out extreme points, namely wave crests and wave troughs in a signal by utilizing a neighborhood difference method; secondly, judging a rising edge through a threshold value in the previously determined extreme point, and screening out a wave crest; and finally, determining the pulse position according to the maximum principle of the area in the sliding window to obtain the square wave position.
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| CN202010983229.7A CN112183268A (en) | 2020-09-18 | 2020-09-18 | MWD mud pressure wave processing method |
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| CN202010983229.7A CN112183268A (en) | 2020-09-18 | 2020-09-18 | MWD mud pressure wave processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657574A (en) * | 2022-12-28 | 2023-01-31 | 合力（天津）能源科技股份有限公司 | Control system based on pressure wave communication |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437689A (en) * | 2016-09-13 | 2017-02-22 | 中国石油大学(华东) | Method for processing mud-while-drilling positive pulse signal |
| US20180003044A1 (en) * | 2016-06-30 | 2018-01-04 | Schlumberger Technology Corporation | Methods and systems for spectrum estimation for measure while drilling telemetry in a well system |
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2020
- 2020-09-18 CN CN202010983229.7A patent/CN112183268A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180003044A1 (en) * | 2016-06-30 | 2018-01-04 | Schlumberger Technology Corporation | Methods and systems for spectrum estimation for measure while drilling telemetry in a well system |
| CN106437689A (en) * | 2016-09-13 | 2017-02-22 | 中国石油大学(华东) | Method for processing mud-while-drilling positive pulse signal |
Non-Patent Citations (5)
| Title |
|---|
| 李宏等: "泥浆脉冲信号的小波检测方法研究及应用", 《长江大学学报(自然科学版)理工卷》 * |
| 梁耀: "随钻泥浆脉冲信号的处理", 《中国优秀硕士学位论文全文数据库》 * |
| 涂兵 等: "MWD泥浆脉冲信号互相关滤波算法的研究", 《仪器仪表学报》 * |
| 蔡鹏飞 等: "面向随钻测量的泥浆压力信号脉冲识别研究", 《成都信息工程大学学报》 * |
| 边海龙 等: "连续波随钻测量信号井下传输特性分析", 《仪器仪表学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657574A (en) * | 2022-12-28 | 2023-01-31 | 合力（天津）能源科技股份有限公司 | Control system based on pressure wave communication |
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