CN105587313A - High temperature slim hole well logging telemetry system and method - Google Patents
High temperature slim hole well logging telemetry system and method Download PDFInfo
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- CN105587313A CN105587313A CN201410568139.6A CN201410568139A CN105587313A CN 105587313 A CN105587313 A CN 105587313A CN 201410568139 A CN201410568139 A CN 201410568139A CN 105587313 A CN105587313 A CN 105587313A
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Abstract
The invention discloses a high temperature slim hole well logging telemetry system and method. The high temperature slim hole well logging telemetry system comprises surface equipment, a well logging cable and a down-hole instrument, wherein the surface equipment is connected with the down-hole instrument through the well logging cable; the down-hole instrument performs data communication with the surface equipment through the well logging cable, and an orthogonal frequency division multiplexing technique is used for the communication.
Description
Technical field
Present invention relates in general to logging remote transmission field, relate more specifically to high temperature slim-hole logging remote transmission system and method.
Background technology
Well logging, is also geophysical log or oil well logging, is called for short well logging, is the geophysics characteristics such as the electrochemical properties that utilizes rock stratum, conductive characteristic, acoustic characteristic, radioactivity, and the method for measurement geophysical parameters, belongs to one of applied geophysics method. When oil drilling, all must log well getting into after the deep degree of planned well, claim again completion logging, to obtain various petroleum geologies and engineering data, i.e. the information such as reservoir depth, thickness, as completion and the firsthand information that develops oil fields.
Along with the development of petroleum exploration and development situation, for the increasing of the exploration and development dynamics of the ultradeep well of marine bed, the high temperature of 8000 meters of left and right, high pressure, ultradeep well will get more and more; For reducing exploration cost, minor diameter drilling well is also more and more simultaneously; And along with the extensive use of window sidetracking technology, be badly in need of the minor diameter series logger of superhigh temperature super-pressure.
And along with the development of logging technique, the information that downhole instrument gathers is abundanter, the data volume that need to upload is increasing. Then, be subject to the restriction of minor diameter well, logging cable generally can only adopt 7 core minor diameter logging cables, and this cable bandwidth is little, is subject to such environmental effects large, and signal attenuation is large, distortion is large. And, transmitting data by logging cable and conventionally adopt traditional baseband modulation technology, its low transmission rate is also the bottleneck of restriction logger and big data quantity transmission.
Therefore, need now a kind of logging remote transmission technology that can accurately transmit in a large number data in Small Diameter At High Temperature well bore logging environment.
Summary of the invention
Therefore, the object of the present invention is to provide and a kind ofly can in Small Diameter At High Temperature well bore logging environment, transmit exactly, in large quantities logging remote transmission system and the method for data, thereby alleviate as far as possible or overcome problem above-mentioned.
According to an aspect of the present invention, provide a kind of high temperature slim-hole logging remote transmission system, described system comprises: ground installation, logging cable and downhole instrument; Wherein said ground installation is connected with described downhole instrument by described logging cable, and described downhole instrument carries out data communication by described logging cable and described ground installation, and described communication is used orthogonal frequency division multiplexi.
In high temperature slim-hole logging remote transmission system according to a preferred embodiment of the present invention, described logging cable is minor diameter logging cable.
In high temperature slim-hole logging remote transmission system according to a preferred embodiment of the present invention, described logging cable is multicore logging cable.
In high temperature slim-hole logging remote transmission system according to a preferred embodiment of the present invention, described multicore logging cable is 7 core logging cables.
In high temperature slim-hole logging remote transmission system according to a preferred embodiment of the present invention, pattern 5 channels of described logging cable are that the mode 7 channel of up channel and described logging cable is down channel.
In high temperature slim-hole logging remote transmission system according to a preferred embodiment of the present invention, described up channel uses T9 to T63 subchannel and described down channel to use T1 to T7 subchannel.
According to a further aspect in the invention, provide a kind of high temperature slim-hole logging remote transmission method, described method comprises: connect ground installation and downhole instrument by logging cable; Described downhole instrument carries out data communication by described logging cable and described ground installation; Use orthogonal frequency division multiplexi to carry out described communication.
In high temperature slim-hole logging remote transmission method according to a preferred embodiment of the present invention, described logging cable is minor diameter logging cable.
In high temperature slim-hole logging remote transmission method according to a preferred embodiment of the present invention, described logging cable is multicore logging cable.
In high temperature slim-hole logging remote transmission method according to a preferred embodiment of the present invention, described multicore logging cable is 7 core logging cables.
In high temperature slim-hole logging remote transmission method according to a preferred embodiment of the present invention, pattern 5 channels of described logging cable are that the mode 7 channel of up channel and described logging cable is down channel.
In high temperature slim-hole logging remote transmission method according to a preferred embodiment of the present invention, described up channel uses T9 to T63 subchannel and described down channel to use T1 to T7 subchannel.
Can see from content above, the present invention is applied to OFDM (OFDM) technology the logging remote transmission of high temperature slim-hole, thereby make this logging remote transmission system and method possess the advantage that OFDM technology itself possesses, for example, there is with respect to the baseband modulation technology adopting in traditional logging system the advantage that transfer rate is high, the bit error rate is low, antijamming capability is strong. Can also provide operating factor of highband according to logging remote transmission system of the present invention and method, therefore under band-limited condition, realized the high-speed transfer of data and and then solved the communication performance bottleneck in minor diameter well logging.
Brief description of the drawings
Carry out following description below with reference to accompanying drawing, to can more thoroughly understand present disclosure, in the accompanying drawings:
Fig. 1 is the schematic diagram of high temperature slim-hole logging remote transmission system according to an embodiment of the invention;
Fig. 2 is the diagram of the cable mode that high temperature slim-hole logging remote transmission system uses according to an embodiment of the invention;
Fig. 3 is the schematic diagram of the communicator channel distribution that high temperature slim-hole logging remote transmission system uses according to an embodiment of the invention;
Fig. 4 is the circuit block diagram of high temperature slim-hole logging remote transmission system according to an embodiment of the invention;
Fig. 5 is the flow chart of high temperature slim-hole logging remote transmission method according to an embodiment of the invention.
Detailed description of the invention
To describe specific embodiments of the invention below in detail, embodiments of the invention shown in the drawings. But, can be with many multi-form the present invention that embody, and should not be understood as the embodiment that is confined to set forth herein. On the contrary, providing these embodiment to make the disclosure will be thorough and complete, and will pass on scope of the present invention to those skilled in the art comprehensively. Identical Reference numeral is indicated identical element from start to finish.
Although it should be understood that term " first ", " second " etc. can be used for describing various elements in this article, these elements should not be subject to the restriction of these terms. These terms are only used for an element and another to differentiate.
Term as used herein is only for the object of describing specific embodiment, and is not intended to limit the present invention. Unless context clearly indicates, singulative " ", " one " and " being somebody's turn to do " intention of using herein also comprise plural form. What will also be understood that is in the time using in this article, term " comprises " and/or specifies " comprising " existence of described feature, entirety, step, operation, element and/or assembly, but does not get rid of existence or the interpolation of one or more other features, entirety, step, operation, element, assembly and/or its group.
Unless otherwise defined, all terms (comprising technology and scientific terminology) that use herein have the general identical meaning of understanding with those skilled in the art. What will also be understood that is term as used herein to be interpreted as to have the meaning consistent with its meaning in the context of this description and association area, and should not making an explanation with idealized or excessive formal meaning, unless definition so clearly in this article.
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
With reference to figure 1, Fig. 1 is the schematic diagram of high temperature slim-hole logging remote transmission system according to an embodiment of the invention.
As can see from Figure 1, comprise according to the high temperature slim-hole logging remote transmission system of the embodiment of the present invention: ground installation, logging cable and downhole instrument three parts. It should be appreciated by those skilled in the art that logging remote transmission system also may comprise other auxiliary equipment, for example pulley, derrick etc., but for not fuzzy explanation of the present invention, at this, other auxiliary equipment are not described and are not illustrated in the drawings.
In logging remote transmission system, ground installation generally can comprise various processors, the memory of storage data etc. of processing log data. Downhole instrument generally can comprise the parts such as the needed pole plate of well logging, electrode, telecommunication circuit, power supply, and some in these parts are arranged in vacuum flask and can normally work at hot and humid severe logging environment to ensure parts. Ground installation can be connected with downhole instrument by logging cable. Logging cable had both had the effect as the communication path of ground installation and downhole instrument in this effect, had again the effect as the draught line of downhole instrument. Therefore, generally speaking, logging cable may have less diameter in slim-hole. Minor diameter logging cable refers generally to the logging cable that cable size is less than or equal to 50mm. By this logging cable, downhole instrument can carry out data communication with ground installation and transmit control command etc. with transmission log data or by ground installation to downhole instrument. Because traditional logging system uses baseband modulation technical transmission data, so traditional logging system has the shortcoming that transfer rate is low and transmitted data amount is little. For this shortcoming, according to the present invention, communicating by letter between ground installation and downhole instrument can be used orthogonal frequency division multiplexi.
OFDM, English former title OrthogonalFrequencyDivisionMultiplexing, is abbreviated as OFDM. Its main thought is: channel is divided into some orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, be modulated on every sub-channels and transmit. Orthogonal signalling can, by adopting correlation technique to separate at receiving terminal, can reduce the phase mutual interference ICI between subchannel like this. Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and therefore the flatness of can regarding as on every sub-channels declines, thereby can eliminate intersymbol interference. And because the bandwidth of every sub-channels is only the sub-fraction of former channel width, it is relatively easy that channel equalization becomes.
Due to the above advantage of OFDM, logging remote transmission system according to the present invention utilizes the orthogonality between subcarrier to improve well band efficiency and has alleviated intersymbol interference problem, thereby make system there is stronger antijamming capability and adaptive ability, can on band-limited logging cable, realize the high-speed transfer of data.
As described above, the logging cable using in high temperature slim-hole logging remote transmission system according to an embodiment of the invention can be minor diameter logging cable, and this is mainly the borehole diameter in order to adapt to some slim-hole. In addition the logging cable using in high temperature slim-hole logging remote transmission system according to an embodiment of the invention, can be multicore logging cable and be generally speaking 7 core logging cables. 7 cores in 7 core logging cables have different effects separately, and therefore it has the purposes compared with horn of plenty. Logging system according to the present invention can use the pattern 5 and 7 of 7 core logging cables respectively as up-downgoing channel in the time using orthogonal frequency division multiplexi to communicate. The schematic diagram of these two patterns with frequency decay has been shown in Fig. 2.
In Fig. 2, solid line represents that the attenuation characteristic of pattern 5 and star line represent the attenuation characteristic of mode 7. From this figure, can see, frequency decling phase more than 250kHz is when serious, and this shows signal very possible serious distortion after very long logging cable transmission. And orthogonal frequency division multiplexi can make full use of frequency spectrum, be different subchannel distribute energy adaptively, this just makes can provide high transfer rate in the situation that not changing transmission cable characteristics.
For fear of crosstalking of homogenous frequency signal, up channel can use T9 to T63 subchannel, and down channel can use T1-T7 subchannel, vacates T8 subchannel as isolation strip, and T0 is that direct current channel does not also use. Above-mentioned subchannel in up-downgoing channel is divided shown in Figure 3.
Describe according to the telecommunication circuit block diagram of high temperature slim-hole logging remote transmission system of the present invention below in conjunction with Fig. 4.
In Fig. 4, can see, system is mainly made up of digital signal processor (DSP), field programmable gate array (FPGA) and analog circuit. Data retransmission when training process when wherein digital signal processor completion system is set up and normal mode. Field programmable gate array completes the modulation and demodulation of the OFDM to information, need the information that sends through scrambler, RS coding, constellation mapping, QAM modulation and, after IFFT processes and inserts Cyclic Prefix, write digital to analog converter (D/A) according to fixing sample frequency, after passing through bandpass filtering again, utilize transformer coupled to logging cable. The signal receiving by bandpass filtering filtering out-of-band noise, is input in field programmable gate array by analog-digital converter (A/D) afterwards after receiving circuit. In programmable gate array, can complete at the scene time domain equalization to signal, remove CP, FFT, write reception buffer memory after QAM demodulation, constellation decoder, RS decoding, descrambling, wait for reading of digital signal processor. The functions such as conditioning, automatic gain control, filtering and the power emission of simulation part settling signal.
High temperature slim-hole logging remote transmission system according to the present invention is owing to having adopted orthogonal frequency division multiplexi to carry out transfer of data, overcome the shortcoming that traditional logging system data rate is low, volume of transmitted data is little, realize high speed data transfer and reliable and stable, once go into the well and just can obtain whole log datas, improved logging efficiency. Therefore, can save well logging time and cost according to logging system of the present invention.
According to logging system of the present invention in theory up channel speed can exceed 800kbps and down channel speed can exceed 50kbps. In fact both can reach respectively 1035kbps and 115kbps. And the in the situation that of this high transfer rate, system band vacuum flask can be worked 2 hours at 235 DEG C.
In addition, can connect with LEAP800 well logging ground-based system is seamless according to high temperature slim-hole logging remote transmission system of the present invention, this has enriched systemic-function, has improved the integration of system. And, according to the hardware configuration of high temperature slim-hole logging remote transmission system of the present invention, communication protocol can with LEAP800 well logging ground-based system compatibility, only need simply can directly connect open hole well halter by adapter, and completely compatible with LEAP800Wellscope ground Logging Software.
Below in conjunction with Fig. 5, high temperature slim-hole logging remote transmission method is according to an embodiment of the invention described. Fig. 5 shows the flow chart of high temperature slim-hole logging remote transmission method 500 according to an embodiment of the invention.
In flow chart, described method 500 can comprise step S501, connects ground installation and downhole instrument by logging cable; Step S502, downhole instrument carries out data communication by logging cable and ground installation; Step S503, uses orthogonal frequency division multiplexi to carry out described communication.
In sum, the invention provides high temperature slim-hole logging remote transmission system and method, wherein used orthogonal frequency division multiplexi to carry out communicating by letter between ground installation and downhole instrument. The use of this technology makes that system and a method according to the invention has that message transmission rate is fast, antijamming capability is strong, broken through the data communication bottleneck that narrow bandwidth causes and the advantage of saving well logging time and cost.
Although described by reference to the accompanying drawings specific embodiments of the invention above-mentioned, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various changes, amendment and equivalent substitution to the present invention. Those skilled in the art be also to be understood that and the invention is not restricted to disclosed precise forms. Within above-mentioned change, amendment and equivalent substitution all mean and fall into the spirit and scope that the claims of enclosing limit.
Claims (12)
1. a high temperature slim-hole logging remote transmission system, described system comprises: ground installation, logging cable and downhole instrument; Wherein said ground installation is connected with described downhole instrument by described logging cable, and described downhole instrument carries out data communication by described logging cable and described ground installation, and described communication is used orthogonal frequency division multiplexi.
2. high temperature slim-hole logging remote transmission system according to claim 1, wherein said logging cable is minor diameter logging cable.
3. high temperature slim-hole logging remote transmission system according to claim 1 and 2, wherein said logging cable is multicore logging cable.
4. high temperature slim-hole logging remote transmission system according to claim 3, wherein said multicore logging cable is 7 core logging cables.
5. high temperature slim-hole logging remote transmission system according to claim 4, pattern 5 channels of wherein said logging cable are that the mode 7 channel of up channel and described logging cable is down channel.
6. high temperature slim-hole logging remote transmission system according to claim 5, wherein said up channel uses T9 to T63 subchannel and described down channel to use T1 to T7 subchannel.
7. a high temperature slim-hole logging remote transmission method, described method comprises:
Connect ground installation and downhole instrument by logging cable;
Described downhole instrument carries out data communication by described logging cable and described ground installation;
Use orthogonal frequency division multiplexi to carry out described communication.
8. high temperature slim-hole logging remote transmission method according to claim 7, wherein said logging cable is minor diameter logging cable.
9. the high temperature slim-hole logging remote transmission method of stating according to claim 7 or 8, wherein said logging cable is multicore logging cable.
10. high temperature slim-hole logging remote transmission method according to claim 9, wherein said multicore logging cable is 7 core logging cables.
11. high temperature slim-hole logging remote transmission methods according to claim 10, pattern 5 channels of wherein said logging cable are that the mode 7 channel of up channel and described logging cable is down channel.
12. high temperature slim-hole logging remote transmission methods according to claim 11, wherein said up channel uses T9 to T63 subchannel and described down channel to use T1 to T7 subchannel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410568139.6A CN105587313A (en) | 2014-10-23 | 2014-10-23 | High temperature slim hole well logging telemetry system and method |
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| CN201410568139.6A CN105587313A (en) | 2014-10-23 | 2014-10-23 | High temperature slim hole well logging telemetry system and method |
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| CN110080749A (en) * | 2019-04-08 | 2019-08-02 | 中国科学技术大学 | A kind of universal adaptive high speed logging remote transmission system |
| CN111636865A (en) * | 2020-06-04 | 2020-09-08 | 河南理工大学 | Data transmission system on logging cable |
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| CN111636865B (en) * | 2020-06-04 | 2023-04-07 | 河南理工大学 | Data transmission system on logging cable |
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