CN109779601B - Adaptive decoding method for downlink instruction of rotary steering drilling system - Google Patents
Adaptive decoding method for downlink instruction of rotary steering drilling system Download PDFInfo
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Abstract
The invention discloses a self-adaptive decoding method for a downlink instruction of a rotary steering drilling system, which comprises the steps that an instruction conversion system converts the downlink instruction into a rotating speed signal of a mud generator; collecting a rotating speed signal of the slurry generator, and filtering the rotating speed signal; judging the magnitude relation between the correlation degree and the preset correlation degree, acquiring the gradient value of the wake-up sequence in the download instruction within a certain time range, and automatically adjusting the threshold values h1 and h2 of the gradient value of the data sequence in the subsequent download instruction according to the gradient value of the wake-up sequence in the download instruction; determining a pulse sequence edge of a data sequence in the download instruction; and determining the pulse width of the data sequence according to the judgment result, and determining a download signal according to the pulse width. The advantages are that: the awakening sequence is detected through a correlation algorithm, the identification accuracy of the awakening sequence is improved, the thresholds h1 and h2 for identifying the gradient value of the data sequence are adjusted in a self-adaptive mode according to the gradient value of the awakening sequence, and decoding errors caused by unreasonable threshold setting are avoided.
Description
Technical Field
The invention relates to the field of petroleum drilling, in particular to a method for adaptively decoding a downlink instruction of a rotary steering drilling system.
Background
The rotary steering drilling system is an automatic closed-loop drilling technology developed in the 90 s of the 20 th century, and compared with the traditional drilling technology, the rotary steering drilling technology can enable a drill bit to be in a continuous rotating state, so that the well hole purification effect is better, the well trajectory control precision is higher, the drilling speed is higher, the probability of accidents such as drill sticking and the like is lower, the displacement extension capacity is higher, and the rotary steering drilling system has important significance for exploration and development of oil and gas resources and improvement of oil and gas recovery ratio of an oil field.
The basic idea of the rotary steering drilling system is that the underground system does not need to stop drilling while rotary drilling, receives a ground down-transmission command transmitted by mud through an underground control system, applies certain continuous variable lateral force in a specific direction of a drill string, and artificially changes the advancing direction of a drill bit, thereby achieving the purpose of geometric steering or geological steering in rotation. Therefore, accurate receipt and decoding of the downloaded instructions by the downhole control system is very important.
At present, the relatively mature ground instruction downloading method at home and abroad is to divide the vertical pipe mud for a certain time and a certain flow rate to enable the rotating speed of the underground mud generator to be periodically changed, so that the coding of the ground downloading instruction is realized, then the rotating speed change is detected and decoded by a mud generator control circuit, and the decoding result is transmitted to a rotary steering tool control circuit, so that the function of controlling the rotary steering tool is realized. The present decoding method of the download instruction, for example, the patent: 201310471238, judging whether there is a download signal by judging whether the peak value of the filtered flow data reaches the set value H; and determines the pulse edge signal by determining whether the gradient value of the pulse signal exceeds the set values h1 and h 2. The method has the disadvantages that decoding is carried out by judging the value of the flow signal, the decoding is influenced by drilling environments such as mud characteristics, well depth, various high-temperature high-pressure strong vibration and the like, the amplitude of the flow signal is attenuated or suddenly changed to different degrees, great limitation exists when a fixed set value is used for judging a download signal and a pulse signal, and low decoding rate and false triggering are inevitably caused.
Disclosure of Invention
The present invention is directed to a method for adaptively decoding a downlink command in a rotary steerable drilling system, so as to solve the foregoing problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for adaptively decoding a downlink command of a rotary steerable drilling system, wherein the rotary steerable drilling system comprises a command conversion system, a downhole control system, a mud generator and a rotary steerable tool; the method comprises the following steps:
s1, converting the download instruction into a rotating speed signal of the mud generator by the instruction conversion system;
s2, the underground control system collects the rotating speed signal of the slurry generator in real time and carries out filtering processing on the rotating speed signal;
s3, the underground control system calculates the average gradient value of the rotation speed signal after filtering within preset time, and calculates the correlation between the average gradient value and the standard gradient value of the wake-up sequence in the downlink instruction;
s4, the underground control system judges the magnitude relation between the degree of correlation and the preset degree of correlation, if the degree of correlation is larger than the preset degree of correlation, the underground control system stops uploading signals, the step S5 is executed, and if the degree of correlation is smaller than or equal to the preset degree of correlation, the step S1 is returned;
s5, the underground control system obtains the gradient value of the wake-up sequence in the download instruction within a certain time range, and automatically adjusts the threshold values h1 and h2 of the gradient value of the data sequence in the subsequent download instruction according to the gradient value of the wake-up sequence in the download instruction;
s6, the underground control system acquires the pulse sequence edge of the data sequence in the download instruction, and if the pole value of the gradient value of the data sequence last time is the minimum value, the maximum value point in the time period when the gradient value of the data sequence is larger than h1 is judged to be the pulse sequence rising edge; if the pole value of the last data sequence gradient value is the maximum value, determining that the minimum value point in the time period when the data sequence gradient value is smaller than h2 is the falling edge of the pulse sequence;
s7, determining the pulse width of the data sequence according to the pulse sequence edge of the data sequence in the downloading command determined in the step S5 by the underground control system, and determining a downloading signal according to the pulse width;
and S8, the underground control system verifies the down-transmission signal, if the verification fails, the step S1 is returned, if the verification passes, an instruction is sent to the rotary guiding tool, and the rotary guiding tool adjusts the working state of the rotary guiding tool according to the instruction.
Preferably, the download instruction is composed of a wake-up sequence and a data sequence, and the wake-up sequence is a series of high-low pulse signals with fixed length and fixed content.
Preferably, in step S1, "0" and "1" of the download command correspond to "high rotation speed" and "low rotation speed" of the mud generator, respectively.
Preferably, the thresholds h1 and h2 are preset in the downhole control system, and the downhole control system adaptively adjusts h1 and h2 according to the gradient value of the wake-up sequence in the downlink command.
Preferably, a timer is arranged in the downhole control system, and the preset time is preset in the timer.
Preferably, the standard gradient value of the wake-up sequence in the downlink command is preset in the downhole control system.
The invention has the beneficial effects that: 1. the accuracy rate of the identification of the wake-up sequence is improved. 2. By changing the threshold value in a self-adaptive manner, decoding errors caused by the fact that the threshold value is a fixed value and is unreasonably set are avoided. 3. The problems of low decoding success rate and false triggering caused by attenuation and interference of a downlink signal are solved.
Drawings
Fig. 1 is a flow chart of a decoding method in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the present invention provides a method for adaptively decoding a downlink command of a rotary steerable drilling system, comprising the following steps: s1, converting the download instruction into a rotating speed signal of the mud generator by the instruction conversion system;
s2, the underground control system collects the rotating speed signal of the slurry generator in real time and carries out filtering processing on the rotating speed signal;
s3, the underground control system calculates the average gradient value of the rotation speed signal after filtering within preset time, and calculates the correlation between the average gradient value and the standard gradient value of the wake-up sequence in the downlink instruction;
s4, the underground control system judges the magnitude relation between the degree of correlation and the preset degree of correlation, if the degree of correlation is larger than the preset degree of correlation, the underground control system stops uploading signals, the step S5 is executed, and if the degree of correlation is smaller than or equal to the preset degree of correlation, the step S1 is returned;
s5, the underground control system obtains the gradient value of the wake-up sequence in the download instruction within a certain time range, and automatically adjusts the threshold values h1 and h2 of the gradient value of the data sequence in the subsequent download instruction according to the gradient value of the wake-up sequence in the download instruction;
s6, the underground control system acquires the pulse sequence edge of the data sequence in the download instruction, and if the pole value of the gradient value of the data sequence last time is the minimum value, the maximum value point in the time period when the gradient value of the data sequence is larger than h1 is judged to be the pulse sequence rising edge; if the pole value of the last data sequence gradient value is the maximum value, determining that the minimum value point in the time period when the data sequence gradient value is smaller than h2 is the falling edge of the pulse sequence;
s7, determining the pulse width of the data sequence according to the pulse sequence edge of the data sequence in the downloading command determined in the step S5 by the underground control system, and determining a downloading signal according to the pulse width;
and S8, the underground control system verifies the down-transmission signal, if the verification fails, the step S1 is returned, if the verification passes, an instruction is sent to the rotary guiding tool, and the rotary guiding tool adjusts the working state of the rotary guiding tool according to the instruction.
In this embodiment, when an instruction needs to be downloaded, the instruction conversion system of the rotary steerable drilling system converts high and low pulses of the downloaded instruction into a switching signal of the diverter valve, the diverter valve controls the size of mud flow, the rotation speed of the mud generator changes with the mud flow, and the aboveground control system converts the downloaded instruction into a rotation speed signal of the mud generator. And a special instruction conversion system is arranged in the aboveground control system and is used for converting the downloaded instruction.
In this embodiment, the download instruction consists of a wake-up sequence and a data series, where the wake-up sequence is a series of high and low pulse signals with fixed length and fixed content, such as high level 16 seconds, low level 8 seconds, high level 12 seconds, low level 8 seconds, and high level 12 seconds; the data sequence consists of three parts, namely a command header, a download parameter, a check area and the like.
In this embodiment, the underground control system collects the rotation speed signal of the slurry generator in real time, and performs filtering processing on the rotation speed signal, so as to prevent the rotation speed signal from being interfered, thereby affecting the download signal. And a decoding unit special for acquiring a rotating speed signal of the slurry generator is arranged in the underground control system.
In this embodiment, a timer is disposed in the downhole control system, a preset time is preset in the timer, the preset time can be set manually, the downhole control system calculates an average gradient value of the filtered rotation speed signal within the preset time, a wake-up sequence standard gradient value is also preset in the downhole control system, the downhole control system calculates a correlation between the average gradient value of the rotation speed signal and the standard gradient value of the wake-up sequence, a preset correlation is preset in the downhole control system, the downhole control system compares a size relationship between the correlation and the preset correlation, if the correlation is greater than the preset correlation, the downhole control system obtains the gradient value of the wake-up sequence in the downlink command, and automatically adjusts threshold values h1 and h2 of the gradient value of the data sequence in the subsequent downlink command according to the gradient value of the wake-up sequence in the downlink command, if the correlation is less than or equal to the preset correlation, the uphole control system will re-convert the download instruction. The preset correlation degree is 0.8, and the preset correlation degree is set artificially or can be other reasonable numerical values.
In this embodiment, when the correlation degree is greater than the preset correlation degree, it indicates that the wakeup sequence is detected, and at this time, the downhole control system immediately stops sending the upload signal, so as to avoid the upload signal interfering with the rotation speed of the mud generator, causing rotation speed fluctuation, and affecting transmission of the underpass command.
In this embodiment, after the thresholds h1 and h2 of the gradient values of the data sequence in the subsequent download instruction are adjusted, the downhole control system detects the pulse sequence edge of the data sequence, and if the pole value of the gradient value of the data sequence last time is the minimum value, determines that the maximum value point in the time period when the gradient value of the data sequence is greater than h1 is the rising edge of the pulse sequence; and if the pole value of the gradient value of the data sequence is the maximum value last time, determining that the minimum value point in the time period when the gradient value of the data sequence is less than h2 is the falling edge of the pulse sequence.
In this embodiment, after the downhole control system detects the pulse sequence edge of the data sequence, the pulse width of the data sequence is determined according to the pulse sequence edge of the data sequence, and the download signal is determined according to the pulse width.
In this embodiment, the downhole control system checks the download signal, if the check is wrong, the instruction conversion system converts the download instruction again and executes subsequent steps, and if the check is passed, the downhole control system sends the instruction to the rotary steering tool, and the rotary steering tool receives the instruction and adjusts the working state of the rotary steering tool.
In this embodiment, two complete algorithm programs, namely, a wakeup sequence identification algorithm and a data sequence identification algorithm, are preset in the downhole control system. When an instruction needs to be downloaded, an instruction conversion system of the rotary steering drilling system converts high and low pulses of the downloaded instruction into 'off' and 'on' of a shunt valve, the size of mud flow is influenced, and the rotating speed of the underground mud generator is divided into high and low according to the change of the mud flow; the underground control system continuously acquires a rotating speed signal of the generator, and performs pulse compensation, filtering and gradient calculation on the rotating speed signal; selecting the average gradient value of the rotating speed signal within a period of time, calculating the correlation between the average gradient value and the standard gradient value of the wake-up sequence in the downloading instruction, if the correlation is greater than 0.8, indicating that the wake-up sequence in the downloading instruction is detected, if the correlation is greater than 0.8, entering a data sequence recognition algorithm, if the correlation is less than 0.8, indicating that the wake-up sequence is not detected, and if the correlation is not greater than 0.8, switching the downloading instruction again by an instruction switching system. The correlation algorithm mainly matches whether the shapes of the detected download instruction and the standard download instruction are similar or not, and the sizes of the detected download instruction and the standard download instruction are not matched. The rotation speed gradient value only plays an auxiliary role and is used for filtering interference signals with similar shapes to the awakening sequence.
In this embodiment, in the data identification algorithm, when the wake-up sequence of the download instruction is identified, the upload signal needs to be stopped immediately in order to reduce interference. According to the gradient value of a wake-up sequence in a download instruction within a period of time, automatically adjusting threshold values h1 and h2 of gradient values of a data sequence in a subsequent download instruction, starting a pulse sequence edge of the data sequence in the download instruction, if the pole value of the gradient value of the data sequence last time is a minimum value, a maximum value point in a time period when the gradient value is larger than h1 is a pulse sequence rising edge, and if the pole value of the gradient value of the data sequence last time is a maximum value, a minimum value point in a time period when the gradient value is smaller than h2 is a pulse sequence falling edge; determining the pulse width of the data sequence according to the pulse sequence edge, thereby determining a download signal; and checking the downlink signal, if the verification is passed, immediately sending an instruction to an execution structure of the guiding tool by the underground control system, and otherwise, converting the downlink instruction again by the instruction conversion system.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention provides a self-adaptive decoding method for a downlink instruction of a rotary steering drilling system, which solves the problems of low decoding success rate and false triggering of a downlink signal caused by attenuation and interference. The correlation algorithm in the underground control system in the method is only used for matching the shapes of the wake-up sequence and the standard wake-up sequence and is not matched with the amplitude of the signal, so that the accuracy of the identification of the wake-up sequence is improved. The influence of the field working condition on the wake-up sequence and the data sequence is the same, so that the wake-up sequence is identified, the threshold for identifying the gradient value of the data sequence can be adaptively adjusted according to the gradient value of the wake-up sequence, decoding errors caused by unreasonable threshold setting can be avoided, and the decoding success rate is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (6)
1. A method for adaptively decoding a downlink command of a rotary steerable drilling system, wherein the rotary steerable drilling system comprises a command conversion system, a downhole control system, a mud generator and a rotary steerable tool; the method is characterized by comprising the following steps:
s1, converting the download instruction into a rotating speed signal of the mud generator by the instruction conversion system;
s2, the underground control system collects the rotating speed signal of the slurry generator in real time and carries out filtering processing on the rotating speed signal;
s3, the underground control system calculates the average gradient value of the rotation speed signal after filtering within preset time, and calculates the correlation between the average gradient value and the standard gradient value of the wake-up sequence in the downlink instruction;
s4, the underground control system judges the magnitude relation between the degree of correlation and the preset degree of correlation, if the degree of correlation is larger than the preset degree of correlation, the underground control system stops uploading signals, the step S5 is executed, and if the degree of correlation is smaller than or equal to the preset degree of correlation, the step S1 is returned;
s5, the underground control system obtains the gradient value of the wake-up sequence in the download instruction within a certain time range, and automatically adjusts the threshold values h1 and h2 of the gradient value of the data sequence in the subsequent download instruction according to the gradient value of the wake-up sequence in the download instruction;
s6, the underground control system acquires the pulse sequence edge of the data sequence in the download instruction, and if the pole value of the gradient value of the data sequence last time is the minimum value, the maximum value point in the time period when the gradient value of the data sequence is larger than h1 is judged to be the pulse sequence rising edge; if the pole value of the last data sequence gradient value is the maximum value, determining that the minimum value point in the time period when the data sequence gradient value is smaller than h2 is the falling edge of the pulse sequence;
s7, determining the pulse width of the data sequence according to the pulse sequence edge of the data sequence in the downloading command determined in the step S5 by the underground control system, and determining a downloading signal according to the pulse width;
s8, the underground control system verifies the down-transmission signal, if the verification fails, the step S1 is returned, if the verification passes, an instruction is sent to the rotary guiding tool, and the rotary guiding tool adjusts the working state of the rotary guiding tool according to the instruction;
two complete algorithm programs, namely a wake-up sequence identification algorithm and a data sequence identification algorithm, are preset in the underground control system;
in the awakening sequence identification algorithm, when an instruction needs to be downloaded, an instruction conversion system of the rotary steering drilling system converts high and low pulses of the downloaded instruction into 'off' and 'on' of a shunt valve, the influence is the size of mud flow, and the rotating speed of the underground mud generator is divided into high and low according to the change of the mud flow; the underground control system continuously acquires a rotating speed signal of the generator, and performs pulse compensation, filtering and gradient calculation on the rotating speed signal; selecting an average gradient value of the rotating speed signal within a period of time, calculating the correlation between the average gradient value and a standard gradient value of a wake-up sequence in a download instruction, when the correlation is greater than the preset correlation, indicating that the wake-up sequence in the download instruction is detected, if the correlation is greater than the preset correlation, entering a data sequence recognition algorithm, if the correlation is less than the preset correlation, indicating that the wake-up sequence is not detected, and if the correlation is not greater than the preset correlation, converting the download instruction again by an instruction conversion system;
in the data identification algorithm, when an awakening sequence of a downloading instruction is identified, the uploading signal needs to be stopped immediately in order to reduce interference; according to the gradient value of a wake-up sequence in a download instruction within a period of time, automatically adjusting threshold values h1 and h2 of gradient values of a data sequence in a subsequent download instruction, starting a pulse sequence edge of the data sequence in the download instruction, if the pole value of the gradient value of the data sequence last time is a minimum value, a maximum value point in a time period when the gradient value is larger than h1 is a pulse sequence rising edge, and if the pole value of the gradient value of the data sequence last time is a maximum value, a minimum value point in a time period when the gradient value is smaller than h2 is a pulse sequence falling edge; determining the pulse width of the data sequence according to the pulse sequence edge, thereby determining a download signal; and checking the downlink signal, if the verification is passed, immediately sending an instruction to an execution structure of the guiding tool by the underground control system, and otherwise, converting the downlink instruction again by the instruction conversion system.
2. The adaptive decoding method for the downlink command of the rotary steerable drilling system according to claim 1, wherein: the download instruction consists of a wake-up sequence and a data sequence, wherein the wake-up sequence is a string of high-low pulse signals with fixed length and fixed content.
3. The adaptive decoding method for the downlink command of the rotary steerable drilling system according to claim 1, wherein in step S1, "0" and "1" of the downlink command respectively correspond to "high rotation speed" and "low rotation speed" of the mud generator.
4. The adaptive decoding method for the downlink command of the rotary steerable drilling system according to claim 1, wherein: the thresholds h1 and h2 are preset in the downhole control system, and the downhole control system adjusts h1 and h2 in a self-adaptive mode according to the gradient value of the wake-up sequence in the downlink command.
5. The adaptive decoding method for the downlink command of the rotary steerable drilling system according to claim 1, wherein: a timer is arranged in the underground control system, and the preset time is preset in the timer.
6. The adaptive decoding method for the downlink command of the rotary steerable drilling system according to claim 1, wherein: and the standard gradient value of the wake-up sequence in the downlink instruction is preset in the underground control system.
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| CN111502646A (en) * | 2020-04-30 | 2020-08-07 | 中国石油天然气集团有限公司 | Rotary guide instruction downloading system based on motor frequency conversion control |
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| CN102022082B (en) * | 2010-10-15 | 2013-02-13 | 中国海洋石油总公司 | A ground instruction transmission method for controlling rotary steering drilling tool and an apparatus for the same |
| CN202215240U (en) * | 2011-06-24 | 2012-05-09 | 中国石油化工股份有限公司 | Wake-up device of underground control system |
| CN102644458B (en) * | 2012-04-17 | 2014-10-15 | 中国海洋石油总公司 | Instruction downlink encoding and decoding methods based on mud-pressure pulses |
| CN103670381A (en) * | 2012-08-31 | 2014-03-26 | 北京精密机电控制设备研究所 | Slurry negative pulse data download coding method for well drilling |
| CN103573258B (en) * | 2013-10-10 | 2016-06-15 | 航天科工惯性技术有限公司 | A kind of lower teletype command coding/decoding method of rotary steerable drilling system |
| CN104453714B (en) * | 2014-11-02 | 2016-04-13 | 中国石油集团钻井工程技术研究院 | A kind of control method of rotary steerable tool |
| CN105041212B (en) * | 2015-09-07 | 2018-01-05 | 重庆前卫科技集团有限公司 | A kind of rotary steerable drilling control system and its control method |
| CN106609668B (en) * | 2015-10-23 | 2019-06-25 | 中国石油化工股份有限公司 | One kind is with brill formation pressure testing system underground instruction decoding method and device |
| CN105840186B (en) * | 2016-05-05 | 2022-04-26 | 中国石油天然气集团有限公司 | Underground low-power-consumption control method and circuit based on pressure waves |
| CN108240219A (en) * | 2016-12-24 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of method that rotary steerable drilling system information passes down |
| CN107294221B (en) * | 2017-08-17 | 2018-05-08 | 中国石油大学(华东) | Down-hole switch control system and method |
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