CN104314557A - Data transmission method for underground single-core long cable communication - Google Patents
Data transmission method for underground single-core long cable communication Download PDFInfo
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- CN104314557A CN104314557A CN201410417915.2A CN201410417915A CN104314557A CN 104314557 A CN104314557 A CN 104314557A CN 201410417915 A CN201410417915 A CN 201410417915A CN 104314557 A CN104314557 A CN 104314557A
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- 238000004891 communication Methods 0.000 title claims abstract description 37
- 230000005540 biological transmission Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 238000012795 verification Methods 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000003044 adaptive effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000035939 shock Effects 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Dc Digital Transmission (AREA)
Abstract
The invention discloses a data transmission method for underground single-core long cable communication. An adopted coding rule comprises that 8 different frequencies are divided into a group A and a group B to perform data coding; each group comprises four frequencies; one frequency in the group A and one frequency in the group B are combined to represent a special code; totally 16 codes comprising 0 to 9, decimal points, uneven number verification codes, even number verification codes, negative value symbols with the frequencies exceeding a range, starting and stopping control commands and spare codes are formed; during data transmission, firstly a special wave form is sent to be used as a signal synchronous starting mode; then codes are sent according to the coding rule; each code comprises two frequency bands corresponding to the coding rule; each frequency band comprises a plurality of wave forms with the same quantities in multiple periods. The method is high in transmission efficiency and reliability, and a modem adopted in the method is small in size, low in power consumption, stable in performance and convenient to maintain.
Description
Technical field
The present invention relates to oil and gas well testing technical field, in particular to a kind of data transmission method for the long cable communication of the single core in down-hole.
Background technology
At present, the many employings of the ground-downhole communication single core armored cable transmission means in oil gas field test jobs.Which cost is lower, but by the impact of the adverse circumstances such as transmission medium, manufacturing process and down-hole high temperature, high pressure, have that transmission speed is slow, information content is few, the problem such as signal attenuation, distortion are large, and the decay of cable transmission channel and phase shift sharply increase with the increase of signal frequency and the increase of cable length.
The downhole instrument ubiquity speed of existing dependence cable communication is slow, data transmit the problems such as unreliable, for subsequent data analysis brings obstacle.In practical application, connect problem for solving equipment cable, the cable of reality use and instrument are carried out the method connecting debugging by adopt more.But the method exist cable or instrument change after must redistribution circuit, debug temperature and be difficult to determine, connect cable rolled state and deployed condition characteristic not parity problem in debugging, be difficult to the problem that solution downhole instrument cable communication reliability is difficult to ensure, and add workload and labour intensity.
The base band transmission of single-core cable can not meet the high speed data transfer demand of the operations such as test, well logging, needs to adopt advanced modulation-demodulation technique, to improve band efficiency, realizes the high speed transmitting of data.The cable communication adopting Frequency Patterns to carry out is comparatively reliable, and has higher cable adaptive capacity, but its transfer rate is limited, is difficult to meet high speed data transfer demand.And due to conditions down-hole restriction, have volume little, low in energy consumption, high temperature resistant (more than 150 DEG C) and the high requirement of shock resistance to modem.Market there is no the finished product communication IC of heat-resisting quantity more than 150 DEG C, and adopt loose mail to make modem by oneself according to existing signal and communication mode, circuit is too complicated, and element application is more, can not meet field use requirement.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of data transmission method for the long cable communication of the single core in down-hole, efficiency of transmission is high, reliability is strong, and the modem volume applying it is little, low in energy consumption, stable performance, easy to maintenance.
Therefore, technical scheme of the present invention is as follows:
A kind of data transmission method for the long cable communication of the single core in down-hole, the coding rule adopted is, A, B two groups is divided into encode to data by utilizing 8 different frequencies, often organize 4, a frequency in A group and a combination of frequency in B group represent a particular code, formed altogether comprise 0 ~ 9, the negative value symbol of decimal point, odd number identifying code, even number identifying code, frequency over range, on off control instruction and standby code totally 16 codes;
During transmission data, first a signal synchronous initial code of specific waveform is sent, then send code according to coding rule, each code is made up of two frequency bands corresponding with described coding rule, and each frequency band includes the waveform in quantity identical multiple cycles.
In this technical scheme, the high speed of remote down-hole single-core cable, high reliability communication can be realized, the design of application the method can simplify circuit design greatly, the modem applying this technology has that volume is little, low in energy consumption, stable performance, the advantage such as easy to maintenance, and avoid and adopt communication special IC non-refractory circuit to be difficult to the technical barrier designed; The method efficiently solves in oil field the downhole instrument and the unconformable problem of cable that adopt single core armored cable to carry out communication, improve speed and the reliability of Signal transmissions, transmission speed is enough to the communication requirement of most of loggers of satisfied current industry needs, communication performance is stablized, compliance is comparatively strong, and before eliminating construction operation, cable and instrument carry out the step connecting debugging.
In this technical scheme, adopt the circuit design method of adaptive blind equalization, special modem is used to carry out the communication on downhole instrument and ground, modem adopts novel " class DTMF " signal format of combining with dual tone multi-frequency dtmf form of frequency modulation(PFM), " solve that communication speed is lower, cable adaptive capacity and the poor problem of reliability.
In the data transmission, owing to there is signal disturbing, so each frequency band includes multiple cycle effectively can resist interference, but each frequency band comprises the transfer rate that the too many cycle can affect again data.Sum up according to practical experience, the amount of cycles of the waveform that each frequency band comprises adopts 5 ~ 10, both can ensure the reliability transmitting data, and can ensure again the transfer rate meeting actual needs.
The numerical value of described 8 frequencies, all between 10000Hz and 12000Hz, both can ensure the transmission speed of data, can meet again the needs of the data precision of downhole testing.
Described specific waveforms can be the square-wave waveform of one-period predeterminated frequency, such as, adopt the signal synchronous initial code of the square wave of the 1000Hz of one-period.
Accompanying drawing explanation
Fig. 1 is the schematic diagram for coding rule in the data transmission method of the long cable communication of the single core in down-hole according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the signal format produced for the data transmission method of the long cable communication of the single core in down-hole according to the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
According to an embodiment of the invention for the data transmission method of the long cable communication of the single core in down-hole, the coding rule adopted is, A, B two groups is divided into encode to data by utilizing 8 different frequencies, often organize 4, a frequency in A group and a combination of frequency in B group represent a particular code, formed altogether comprise 0 ~ 9, the negative value symbol of decimal point, odd number identifying code, even number identifying code, frequency over range, on off control instruction and standby code totally 16 codes;
During transmission data, first a signal synchronous initial code of specific waveform is sent, then send code according to coding rule, each code is made up of two frequency bands corresponding with described coding rule, and each frequency band includes the waveform in quantity identical multiple cycles.
Wherein, its frequency of waveform that synchronous initial code is corresponding should be different from the frequency of 8 in coding rule, and to avoid clashing, this is general knowledge known in those skilled in the art, repeats no more; On off control instruction points to data sending terminal to send the start and stop that this instruction sends with control data, and alternate code gives over to for subsequent use.
Coding rule specifically can be as shown in fig. 1,8 different frequencies are combined to form 16 codes, different frequency combination is used to represent 0-9 ten numerals, symbol " * " represents decimal point, A represents odd number identifying code, and B represents even number identifying code, and C represents on off control instruction, D is instruction for subsequent use, and " # " represents the negative value symbol that numerical value exceeds measurement category.With full scale 0-10000psi, maximum temperature-measuring range 0-150 DEG C, after accuracy rating decimal point, the electron pressure of 2 counts and is transmitted as example, its signal format as shown in Figure 2, first the signal synchronous initial code of the square wave of the 1000Hz of one-period is adopted, then every two frequency bands represent a code, include the waveform in 5 cycles in each frequency band.
In this technical scheme, the high speed of remote down-hole single-core cable, high reliability communication can be realized, the design of application the method can simplify circuit design greatly, the modem applying this technology has that volume is little, low in energy consumption, stable performance, the advantage such as easy to maintenance, and avoid and adopt communication special IC non-refractory circuit to be difficult to the technical barrier designed; The method efficiently solves in oil field the downhole instrument and the unconformable problem of cable that adopt single core armored cable to carry out communication, improve speed and the reliability of Signal transmissions, transmission speed is enough to the communication requirement of most of loggers of satisfied current industry needs, communication performance is stablized, compliance is comparatively strong, and before eliminating construction operation, cable and instrument carry out the step connecting debugging.
In this technical scheme, adopt the circuit design method of adaptive blind equalization, special modem is used to carry out the communication on downhole instrument and ground, modem adopts novel " class DTMF " signal format of combining with dual tone multi-frequency dtmf form of frequency modulation(PFM), " solve that communication speed is lower, cable adaptive capacity and the poor problem of reliability.
Technique is applicable to the Signal transmissions of ground system in single-core cable oil and gas well testing, logging operation and downhole tool, greatly can simplify existing underground equipment telecommunication circuit, reduce the volume of modem, reduce its power consumption, and solve the problem that existing communication IC is difficult to carry out high temperature resistant design, substantially increase the telecommunication speed of downhole tool, ensure that its communication robust and adaptivity.Its communication speed can meet needed for industry, the communication need of all loggers except imaging logging.Eliminate complicated cable debugging, simplify operating process, ensure that accuracy and the reliability of well logging result.Technique is a breakthrough of the single-core cable well testing of current oil field, well logging high speed transmission technology, and will fill up a blank of such technology domestic, what have optimism promotes the use of prospect.
In the data transmission, owing to there is signal disturbing, so each frequency band includes multiple cycle effectively can resist interference, but each frequency band comprises the transfer rate that the too many cycle can affect again data.Sum up according to practical experience, the amount of cycles of the waveform that each frequency band comprises adopts 5 ~ 10, both can ensure the reliability transmitting data, and can ensure again the transfer rate meeting actual needs.
In addition, the size of described 8 frequencies can affect transfer rate and the degree of accuracy of data, but the higher speed of the less accuracy of frequency is slower, the more high-speed faster still degree of accuracy of frequency reduces, through practice test, adopt the frequency band of 10000 ~ 12000Hz best, both can ensure the transmission speed of data, the needs of the data precision of downhole testing can be met again, adopt the frequency band bit error rate of embodiment shown in Fig. 1 to be low to moderate 10-6 according to statistics.
Described specific waveforms can be the square-wave waveform of one-period predeterminated frequency, such as, adopt the signal synchronous initial code of the square wave of the 1000Hz of one-period as shown in Figure 2.
In sum, content of the present invention is not limited in the above-described embodiment, and those skilled in the art can propose other embodiment within technological guidance's thought of the present invention, but this embodiment all comprises within the scope of the present invention.
Claims (4)
1., for a data transmission method for the long cable communication of the single core in down-hole, it is characterized in that:
The coding rule adopted is, A, B two groups is divided into encode to data by utilizing 8 different frequencies, often organize 4, a frequency in A group and a combination of frequency in B group represent a particular code, formed altogether comprise 0 ~ 9, the negative value symbol of decimal point, odd number identifying code, even number identifying code, frequency over range, on off control instruction and standby code totally 16 codes;
During transmission data, first a signal synchronous initial code of specific waveform is sent, then send code according to coding rule, each code is made up of two frequency bands corresponding with described coding rule, and each frequency band includes the waveform in quantity identical multiple cycles.
2. the data transmission method for the long cable communication of the single core in down-hole according to claim 1, it is characterized in that, the amount of cycles of the waveform that each frequency band comprises is 5 ~ 10.
3. the data transmission method for the long cable communication of the single core in down-hole according to claim 1 and 2, it is characterized in that, the numerical value of described 8 frequencies is all between 10000Hz and 12000Hz.
4. the data transmission method for the long cable communication of the single core in down-hole according to claim 1 and 2, it is characterized in that, described specific waveforms is the square-wave waveform of one-period predeterminated frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410417915.2A CN104314557B (en) | 2014-08-23 | 2014-08-23 | Data transmission method for underground single-core long cable communication |
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| CN201410417915.2A CN104314557B (en) | 2014-08-23 | 2014-08-23 | Data transmission method for underground single-core long cable communication |
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| CN104314557B CN104314557B (en) | 2017-02-01 |
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Citations (8)
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|---|---|---|---|---|
| WO2002103944A1 (en) * | 2001-06-19 | 2002-12-27 | Baker Hughes Incorporated | Full duplex dmt modulation in well-logging applications |
| US20040085988A1 (en) * | 2002-11-06 | 2004-05-06 | Halliburton Energy Services,Inc. | Code-division multiple-access (CDMA) wireline telemetry system |
| EP1650401A2 (en) * | 1998-12-02 | 2006-04-26 | Halli Burton Energy Services, Inc. | High-power well logging method and apparatus |
| CN101158284A (en) * | 2007-11-05 | 2008-04-09 | 聂泳培 | Single-core cable well logging data high speed transmission system |
| CN102510326A (en) * | 2011-12-15 | 2012-06-20 | 西安思坦仪器股份有限公司 | Full-duplex communication method based on single-core electric cables |
| CN102843166A (en) * | 2012-08-03 | 2012-12-26 | 北京航空航天大学 | Device and method for underground long-distance transmission of Manchester code |
| CN202850989U (en) * | 2012-09-21 | 2013-04-03 | 中国海洋石油总公司 | High speed data transmission system based on single-core logging cable |
| CN203721372U (en) * | 2014-02-21 | 2014-07-16 | 西安弘传科技开发有限责任公司 | Deep well high-speed data transmission system cable |
-
2014
- 2014-08-23 CN CN201410417915.2A patent/CN104314557B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1650401A2 (en) * | 1998-12-02 | 2006-04-26 | Halli Burton Energy Services, Inc. | High-power well logging method and apparatus |
| WO2002103944A1 (en) * | 2001-06-19 | 2002-12-27 | Baker Hughes Incorporated | Full duplex dmt modulation in well-logging applications |
| US20040085988A1 (en) * | 2002-11-06 | 2004-05-06 | Halliburton Energy Services,Inc. | Code-division multiple-access (CDMA) wireline telemetry system |
| CN101158284A (en) * | 2007-11-05 | 2008-04-09 | 聂泳培 | Single-core cable well logging data high speed transmission system |
| CN102510326A (en) * | 2011-12-15 | 2012-06-20 | 西安思坦仪器股份有限公司 | Full-duplex communication method based on single-core electric cables |
| CN102843166A (en) * | 2012-08-03 | 2012-12-26 | 北京航空航天大学 | Device and method for underground long-distance transmission of Manchester code |
| CN202850989U (en) * | 2012-09-21 | 2013-04-03 | 中国海洋石油总公司 | High speed data transmission system based on single-core logging cable |
| CN203721372U (en) * | 2014-02-21 | 2014-07-16 | 西安弘传科技开发有限责任公司 | Deep well high-speed data transmission system cable |
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Effective date of registration: 20210804 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106 Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |