CN101158284A - Single-core cable well logging data high speed transmission system - Google Patents
Single-core cable well logging data high speed transmission system Download PDFInfo
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- CN101158284A CN101158284A CNA2007100360473A CN200710036047A CN101158284A CN 101158284 A CN101158284 A CN 101158284A CN A2007100360473 A CNA2007100360473 A CN A2007100360473A CN 200710036047 A CN200710036047 A CN 200710036047A CN 101158284 A CN101158284 A CN 101158284A
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Abstract
The invention discloses a single core cable well-surveying data high-speed transmitting system, which comprises a ground remote-surveying unit and an under-well remote-surveying unit which are connected through a single core cable, and each unit respectively comprises a sending unit and a receiving unit. The system can be applied to a well-surveying instrument with a diameter over 28 mm, and can be used not only for the single-core cable but also for a three-core cable and a seven-core cable, with a transmission distance above 5000 meters. And the endurable temperature of the under-well unit can reach 125 DEG C and the transmission speed can reach 8 Mbps.
Description
Technical field
The present invention relates to a kind of telemetry system by logging cable high speed transmission data between ground well logging acquisition system and downhole instrument, more particularly, data from the downhole instrument real time high-speed be transferred to ground well logging acquisition system, simultaneously, will order under ground well logging acquisition system and pass to logger.
Background technology
The well logging process is the measurement Control Engineering of a complexity, logger is transferred to certain position of oil well by logging cable, sensor on the logger becomes physical quantity (being generally the signal of telecommunication) with formation information, fluid information, the hole condition information translation of well, send to ground well logging acquisition system by cable behind the assembly coding, the surface well acquisition system also can send control command to downhole instrument.Logging cable not only is used for hanging instrument, as the passage of transfer of data, simultaneously also as the current supply circuit of downhole instrument.
The cable that well logging is used is generally single core, three cores and seven cores.Seven core cable is also referred to as multicore cable, can obtain than single-core cable and the much higher transmission digit rate of three-core cable by the cable core multiplex technique.Cable core is few more, and available transmission channel is few more.Single-core cable has only a cable core, and therefore power supply all must be used identical passage with the signal transmission.The cable core of single-core cable and outer armour constitute current supply circuit.Because the characteristic skewness of cable need be at cable two ends design impedance matching circuit.
Because the restriction of instrument in tubing string internal diameter and the well in the oil well, the instrument external diameter of production logging can not surpass 42mm, generally uses single-core cable.On the single-core cable data transmission technology is used, use telemetry both at home and abroad mostly based on Manchester's code, this coding is judged symbol signal by judging the level saltus step in the clock cycle, owing to there is intersymbol interference, speed is generally not high, be generally 5Kbps, 20Kbps, the highest 100Kbps that is no more than.Along with the application of measuring multiple parameters and array-type sensor, and the raising of signal sampling rate, need higher transfer rate to come real-time transmission data.
The log data transmission that develops into of mechanics of communication provides more technology platforms faster, but because the restriction of well logging condition, cable length changes the inhomogeneous of the cable distribution parameter bring, and the influence of the interior high temperature and high pressure environment of oil well, transfer rate improves seldom when making these technology on being applied in single-core cable, is difficult to reach more than the 1Mbps.
Summary of the invention
The objective of the invention is provides a kind of single-core cable well logging data high speed transmission system at the problem that prior art exists, and can be implemented in remote, high data rate real-time Transmission on the single-cord well logging cable.
The present invention is achieved through the following technical solutions:
Single-core cable well logging data high speed transmission system, comprise ground telemetering unit and downhole telemetry unit two parts, two parts in ground telemetering unit and downhole telemetry unit are connected by single-core cable, each part all comprises transmitting element and two parts of receiving element, described transmitting element comprises deserializer, the OFDM code device, power amplification circuit, the output impedance match circuit, signal is through being modulated on mutually orthogonal a plurality of subcarriers by the OFDM code device behind the deserializer, amplify through power amplification circuit, send on the single-core cable by the mode of output impedance match circuit with frequency division multiplexing; Described receiving element comprises input impedance matching circuit, signal amplification circuit, OFDM decoding device, parallel-to-serial converter, signal is after input impedance matching circuit, signal amplification circuit amplify, decode by the OFDM decoding device, recover initial data through parallel-to-serial converter then.
Further technical scheme is:
Described OFDM code device comprises IFFT module, parallel-to-serial converter, framing module, D/A converter, the IFFT module is modulated to serial bit stream to be sent on the suitable carrier wave, through the synthetic signal of parallel-to-serial converter, and add CP to reduce intersymbol interference, add synchronizing sequence and channel estimation sequence by the framing module.
Described OFDM decoding device comprise catch synchronization module, channel estimation module, separate frame module, deserializer, FFT module, parallel-to-serial converter, catching synchronization module and channel estimation module at first catches synchronously and channel estimating the ofdm signal that receives, after separating frame module, remove CP, enter the decoding of FFT module then, after parallel-to-serial converter recovers the original bit stream signal.
The present invention is based on orthogonal frequency division multiplexi (OFDM), what transmit on cable is quadrature base-band analog signal through ovennodulation, and transmission only needs a cable core.When forming code element, add synchronizing sequence and channel estimation sequence, receiving terminal can happen suddenly prediction, synchronous and channel estimating, thus self adaptation is utilized channel width.All designed special-purpose impedance matching circuit at receiving terminal and transmitting terminal, well the inhibitory reflex ripple.Therefore, the present invention can be implemented in remote, high data rate real-time Transmission on the single-cord well logging cable.
Native system can be applied in the above logger of diameter 28mm, not only can use single-core cable, also can use on three-core cable and seven core cable, and transmission range is greater than 5000m, and unit, down-hole heatproof can reach 125 ℃, and transfer rate reaches 8Mbps.
Description of drawings
Fig. 1 is the present invention's status transmission schematic diagram that is used to log well.
Fig. 2 is that down-hole of the present invention sends/accept the unit schematic diagram.
Fig. 3 is that ground of the present invention sends/accept the unit schematic diagram.
Fig. 4 is an OFDM coding/decoding system structure chart among the present invention.
The specific embodiment
The present invention's status transmission that is used to log well is seen Fig. 1, and ground telemetering unit 4, single-core cable 3, downhole telemetry unit 2 connect successively, and downhole telemetry unit 2 transfers in oil well casing or the oil pipe 1 by single-core cable 3.The downhole telemetry unit hangs various measuring transducers 2 times, is the signal of telecommunication with the oil well information conversion, handles the unified down-hole transmitting element that sends to downhole telemetry unit instrument in back, and coding is after single-core cable 3 sends to ground telemetering unit 4.The sensor that uses has flow, temperature, pressure, resistivity etc.
One embodiment of the present of invention are seen Fig. 2 to Fig. 3, comprise ground telemetering unit 4 and downhole telemetry unit 2 two parts, and 2 two parts in ground telemetering unit 4 and downhole telemetry unit are connected by single-core cable 3.
The down-hole transmitting element 21 of downhole telemetry unit 2 is in full accord with ground transmitting element 41 structures of ground telemetering unit, is made up of deserializer 211,411, OFDM code device 212,412, power amplification circuit 213,413, output impedance match circuit 214,414.
The down-hole receiving element 22 of downhole telemetry unit 2 is in full accord with ground receiving element 42 structures of ground telemetering unit, is made up of parallel-to-serial converter 221,421, OFDM decoding device 222,422, signal amplification circuit 223,423, input impedance matching circuit 224,424.
OFDM code device 212,412 by IFFT module 2121,4121, parallel-to- serial converter 2122,4122, add CP2123,4123, synchronizing sequence 2124,4124, framing module 2125,4125, channel estimation sequence 2127,4127, D/ A module 2126,4126 and form.Signal carries out the IFFT conversion through IFFT module 2121,4121, by parallel-to- serial converter 2122,4122 parallel data is converted into serial data again, adds Cyclic Prefix by adding CP2123,4123, forms the OFDM code elements through framing module 2125,4125.When framing, must add synchronizing sequence 2124,4124 and channel estimation sequence 2127,4127, the prediction so that receiving terminal happens suddenly, synchronous and channel estimating are after the baseband signal of D/ A module 2126,4126 output orthogonals.
OFDM decoding device 222,422 by FFT module 2221,4221, deserializer 2222,4222, catch synchronization module 2223,4223, go CP2224,4224, framing module 2225,4225, channel estimation module sequence 2226,4226 to form.Signal is through catching synchronization module 2223,4223 synchronously and after channel estimation module sequence 2226,4226 carries out channel estimating, by going CP2224,4224 to remove Cyclic Prefix, then through carrying out the FFT conversion by FFT module 2221,4221, carry out integer frequency offset estimation and correction, obtain transmitting data bit flow, after deserializer 2222,4222 outputs to next stage.
Fig. 4 is a module of integrated OFDM code device and OFDM decoding device for the main hardware structure of OFDM modulation among the present invention.According to the chip of selecting for use, the modular structure of enforcement can have difference.It is made up of 5 parts: DSP, FPGA, orthogonal digital upconverter (Quadrature Digital Upconverter), orthogonal digital low-converter (QuadratureDigital Downconverter), FLASH memory.
By the serial received device, DSP1, FLASH1, FPGA, orthogonal digital upconverter connect successively during modulation.DSP1 finishes the IFFT conversion, and FPGA finishes the OFDM framing, and the orthogonal digital upconverter is finished the modulation of OFDM code element, and FLASH1 is DSP1 storage data.
Separate timing by the serial received device, DSP2, FLASH2, FPGA, orthogonal digital low-converter connect successively.DSP2 finishes the FFT conversion, and the burst that FPGA finishes signal detects and timing, and the orthogonal digital low-converter is finished the demodulation of OFDM code element, and FLASH2 is DSP2 storage data.
The DSP that selects for use has following characteristic: maximum operating frequency is 300MHz, the 3.3ns instruction cycle; The 6MB on-chip SRAM; 2 computing modules, each module all have 1 ALU, 1 multiplier, 1 shift register and 1 register group; 2 integer ALU are used to provide addressing and pointer operation; 14 dma controllers.Carry out 256 plural FFT conversion, only need 3.67 μ s.
Orthogonal digital upconverter operating frequency is 200MHz, inner integrated half-band filter, CIC (CascadedIntegrator Cornb) wave filter, anti-sinc filter and 14 figure places/weighted-voltage D/A converter at a high speed, its core is a Direct Digital Frequency Synthesizers DDS (Direct Digital Synthesizcr) that phase place is continuous.In native system, the orthogonal digital upconverter is operated in the orthogonal modulation pattern.
Inner integrated one 14 of orthogonal digital low-converter, the A/D converter of 92Msps and the digital down converter of 4/6 passage.But each passage separate configurations.The inner integrated frequency changer of Digital Down Convert, cascade comb filter able to programme (CIC), 2 bank of filters and digital Auto Gain control.Wherein: frequency transformation realizes by 32 figure place controlled oscillators; CIC realizes 1～32 times extraction; 2 bank of filters comprise the half-band filter of FIR wave filter and 2 times of extractions.Behind the analog intermediate frequency signal process ADC and frequency transformation of input, use bank of filters to carry out filtering and extraction, parallel at last output orthogonal baseband digital signal.
Claims (3)
1. a single-core cable well logging data high speed transmission system comprises ground telemetering unit and downhole telemetry unit, and the downhole telemetry unit is connected by single-core cable with the ground telemetering unit, and each unit all comprises transmitting element and receiving element, it is characterized in that:
Described transmitting element comprises deserializer, OFDM code device, power amplification circuit, output impedance match circuit, signal is through being modulated on mutually orthogonal a plurality of subcarriers by the OFDM code device behind the deserializer, amplify through power amplification circuit, send on the single-core cable by the mode of output impedance match circuit with frequency division multiplexing;
Described receiving element comprises input impedance matching circuit, signal amplification circuit, OFDM decoding device, parallel-to-serial converter, signal is after input impedance matching circuit, signal amplification circuit amplify, decode by the OFDM decoding device, recover initial data through parallel-to-serial converter then.
2. single-core cable well logging data high speed transmission system according to claim 1 is characterized in that: the OFDM code device comprises the IFFT module.Parallel-to-serial converter, framing module, D/A converter, at first the IFFT module is modulated to serial bit stream to be sent on the suitable carrier wave, through the synthetic signal of parallel-to-serial converter, and add CP insertion Cyclic Prefix, add synchronizing sequence and channel estimation sequence by the framing module to reduce intersymbol interference.
3. single-core cable well logging data high speed transmission system according to claim 1, it is characterized in that: the OFDM decoding device comprise catch synchronization module, channel estimation module, separate frame module, deserializer, FFT module, parallel-to-serial converter, catch synchronization module and channel estimation module, at first the ofdm signal that receives is caught synchronously and channel estimating, after separating frame module, removing CP, enter the decoding of FFT module, after parallel-to-serial converter recovers the original bit stream signal.
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| CNA2007100360473A CN101158284A (en) | 2007-11-05 | 2007-11-05 | Single-core cable well logging data high speed transmission system |
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Cited By (17)
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|---|---|---|---|---|
| CN102355326A (en) * | 2011-08-12 | 2012-02-15 | 西安思坦仪器股份有限公司 | Single-core data transmission method |
| CN103067044A (en) * | 2012-12-21 | 2013-04-24 | 中国船舶重工集团公司第七一五研究所 | Distance-increasing and speeding-up method of single coaxial-cable bidirectional data transmission |
| CN103270431A (en) * | 2010-12-23 | 2013-08-28 | 韦尔泰克有限公司 | A downhole well-operation system |
| CN103618656A (en) * | 2013-11-27 | 2014-03-05 | 中国石油天然气集团公司 | Master-slave nodes of networked logging downhole instrument and data processing method thereof |
| CN104314557A (en) * | 2014-08-23 | 2015-01-28 | 中国石油集团渤海钻探工程有限公司 | Data transmission method for underground single-core long cable communication |
| CN104618086A (en) * | 2015-02-15 | 2015-05-13 | 中国海洋石油总公司 | Single-core cable data transmission system and method |
| CN104695948A (en) * | 2015-03-20 | 2015-06-10 | 成都彬鸿科技有限公司 | Logging cable telemetry system |
| CN105484743A (en) * | 2015-12-29 | 2016-04-13 | 广西大学 | Logging device and method |
| CN105587313A (en) * | 2014-10-23 | 2016-05-18 | 中国石油集团长城钻探工程有限公司 | High temperature slim hole well logging telemetry system and method |
| CN105604496A (en) * | 2015-12-24 | 2016-05-25 | 中国石油天然气集团公司 | Cable drill rod channel parameter measuring method and system |
| CN105991493A (en) * | 2015-02-03 | 2016-10-05 | 核工业北京地质研究院 | EFSK technology-based single-core communication device and communication method |
| CN106643900A (en) * | 2016-12-29 | 2017-05-10 | 中国石油天然气股份有限公司 | Multi-parameter testing device |
| CN107610435A (en) * | 2017-08-18 | 2018-01-19 | 中国科学院地质与地球物理研究所 | Suitable for the high speed logging remote transmission means of communication of polytype cable |
| CN108825180A (en) * | 2018-06-13 | 2018-11-16 | 西安奥瑞普瑞电子科技有限公司 | A kind of oil well perforation trajectory observing and controlling positioning system and its observing and controlling localization method |
| CN110984969A (en) * | 2019-12-21 | 2020-04-10 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Single-core cable transmission device with high reliability and self-adaptive rate adjustment and data transmission method thereof |
| CN111666114A (en) * | 2020-04-28 | 2020-09-15 | 中国石油天然气集团有限公司 | Plug-in type well logging data conversion method |
| CN112127880A (en) * | 2020-09-27 | 2020-12-25 | 电子科技大学 | Measuring method of ultra-deep resistivity |
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2007
- 2007-11-05 CN CNA2007100360473A patent/CN101158284A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103270431A (en) * | 2010-12-23 | 2013-08-28 | 韦尔泰克有限公司 | A downhole well-operation system |
| CN103270431B (en) * | 2010-12-23 | 2017-08-11 | 韦尔泰克有限公司 | Underground work system |
| US9588249B2 (en) | 2010-12-23 | 2017-03-07 | Welltec A/S | Downhole well-operation system |
| CN102355326A (en) * | 2011-08-12 | 2012-02-15 | 西安思坦仪器股份有限公司 | Single-core data transmission method |
| CN103067044A (en) * | 2012-12-21 | 2013-04-24 | 中国船舶重工集团公司第七一五研究所 | Distance-increasing and speeding-up method of single coaxial-cable bidirectional data transmission |
| CN103067044B (en) * | 2012-12-21 | 2015-01-28 | 中国船舶重工集团公司第七一五研究所 | Distance-increasing and speeding-up method of single coaxial-cable bidirectional data transmission |
| CN103618656A (en) * | 2013-11-27 | 2014-03-05 | 中国石油天然气集团公司 | Master-slave nodes of networked logging downhole instrument and data processing method thereof |
| CN104314557A (en) * | 2014-08-23 | 2015-01-28 | 中国石油集团渤海钻探工程有限公司 | Data transmission method for underground single-core long cable communication |
| CN104314557B (en) * | 2014-08-23 | 2017-02-01 | 中国石油集团渤海钻探工程有限公司 | Data transmission method for underground single-core long cable communication |
| CN105587313A (en) * | 2014-10-23 | 2016-05-18 | 中国石油集团长城钻探工程有限公司 | High temperature slim hole well logging telemetry system and method |
| CN105991493A (en) * | 2015-02-03 | 2016-10-05 | 核工业北京地质研究院 | EFSK technology-based single-core communication device and communication method |
| CN104618086A (en) * | 2015-02-15 | 2015-05-13 | 中国海洋石油总公司 | Single-core cable data transmission system and method |
| CN104618086B (en) * | 2015-02-15 | 2019-03-12 | 中国海洋石油集团有限公司 | A kind of single conductor cable data transmission system and method |
| CN104695948A (en) * | 2015-03-20 | 2015-06-10 | 成都彬鸿科技有限公司 | Logging cable telemetry system |
| CN105604496B (en) * | 2015-12-24 | 2017-12-05 | 中国石油天然气集团公司 | A kind of measuring method and system for having cable drilling rod channel parameter |
| CN105604496A (en) * | 2015-12-24 | 2016-05-25 | 中国石油天然气集团公司 | Cable drill rod channel parameter measuring method and system |
| CN105484743A (en) * | 2015-12-29 | 2016-04-13 | 广西大学 | Logging device and method |
| CN106643900A (en) * | 2016-12-29 | 2017-05-10 | 中国石油天然气股份有限公司 | Multi-parameter testing device |
| CN107610435A (en) * | 2017-08-18 | 2018-01-19 | 中国科学院地质与地球物理研究所 | Suitable for the high speed logging remote transmission means of communication of polytype cable |
| CN108825180A (en) * | 2018-06-13 | 2018-11-16 | 西安奥瑞普瑞电子科技有限公司 | A kind of oil well perforation trajectory observing and controlling positioning system and its observing and controlling localization method |
| CN110984969A (en) * | 2019-12-21 | 2020-04-10 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Single-core cable transmission device with high reliability and self-adaptive rate adjustment and data transmission method thereof |
| CN110984969B (en) * | 2019-12-21 | 2023-11-28 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | High-reliability self-adaptive rate-adjusting single-core cable transmission device and data transmission method thereof |
| CN111666114A (en) * | 2020-04-28 | 2020-09-15 | 中国石油天然气集团有限公司 | Plug-in type well logging data conversion method |
| CN111666114B (en) * | 2020-04-28 | 2023-08-22 | 中国石油天然气集团有限公司 | Plug-in logging data conversion method |
| CN112127880A (en) * | 2020-09-27 | 2020-12-25 | 电子科技大学 | Measuring method of ultra-deep resistivity |
| CN112127880B (en) * | 2020-09-27 | 2021-09-14 | 电子科技大学 | Measuring method of ultra-deep resistivity |
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