CN107610435A - Suitable for the high speed logging remote transmission means of communication of polytype cable - Google Patents

Suitable for the high speed logging remote transmission means of communication of polytype cable Download PDF

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CN107610435A
CN107610435A CN201710714437.5A CN201710714437A CN107610435A CN 107610435 A CN107610435 A CN 107610435A CN 201710714437 A CN201710714437 A CN 201710714437A CN 107610435 A CN107610435 A CN 107610435A
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data
training
cable
instrument
channel
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CN201710714437.5A
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CN107610435B (en
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孙云涛
陈文轩
王自力
底青云
郑健
张文秀
杨永友
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中国科学院地质与地球物理研究所
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Abstract

The present invention principally falls into logging cable high speed the spread of the rumours field, and in particular to suitable for the high-speed communication method of the polytype cable of petroleum industry.Method utilizes time orthogonal frequency division multiplexing technology, concretely comprises the following steps:Training is synchronized to channel makes ground instrument and downhole instrument establish consistent sampling clock and frame synchronization;Then carry out combined training:The first data of M frames training frame sequence is first sent, then sends the second data of K frames training frame sequence;Ground instrument and downhole instrument, by the repetition of P times, realize the exchange of ground instrument and downhole instrument information according to the data of M frames first and the structure of the second data of K frames;After ground and underground get the configuration information of respective channel, configure it is corresponding send and receive OFDM modulation and demodulation parameters, so as to be transferred to normal transmission mode.This method realizes the full duplex communication on single channel on the basis of orthogonal frequency division multiplexi using time-division multiplex technology, is used in single-core cable or multicore cable.

Description

Suitable for the high speed logging remote transmission means of communication of polytype cable

Technical field

The present invention principally falls into logging cable high speed the spread of the rumours field, and in particular to suitable for the polytype electricity of petroleum industry The high-speed communication method of cable.

Background technology

Oil well logging business mainly includes open-hole logging and cased hole logging, and the communication of downhole instrument and ground system shows Stage generally will be connected the cable of instrument as communication channel, be completed downhole instrument data by the way of wire transmission Upload issues with ground order.Logging cable is broadly divided into seven core cable, three-core cable and list according to the difference of cable core quantity Core cable.According to different well logging business and mounting instrument, the cable of different cable core numbers is used.

With the development of logging technique, either open hole well or cased well, a problem is all suffered from now and is badly in need of solving, That is the data volume of downhole instrument is increasing, and the low rate of the spread of the rumours communication has seriously constrained the development of logger.How The transfer rate for improving logging cable communication is the focus studied at present.

In production well log business, because the data volume that logger uploads is less, power supply uses direct current supply, mainly Using single and three-core cable etc. as logging cable, generally using the graceful side of base band transmission, this spy encodes its communication modes With Alternate Mark Inversion encoding mode, transmission rate is substantially in tens kbps or so.But the single or three-core cable used is limited by cable core number The rareness of amount, uplink and downlink can only use same physical channel, half duplex communication realized using the mode of base band transmission.I.e. The mode of question-response completes the upload issued with downhole data of ground order.In synchronization, semiduplex mode requires hair Channels and receive channel either frequency domain is orthogonal or time domain orthogonal.This not only causes message transmission rate at least to reduce by 50%, And the communication resource of preciousness is wasted, reduce the efficiency of live logging operation.

In order to realize the full duplex communication of high speed, orthogonal frequency division multiplexi (OFDM) is commonly used and is adjusted as channel Mode processed, uplink and downlink channel is used as using different cable core integrated modes.The Discrete Multitone Modulation used in well logging makes Mainly there are two kinds with cable core mode:1st, full duplex communication is realized in logging remote transmission using the separated technology of frequency division+physical channel. Use pattern 5 (2,3,5,6 core) is used as up channel (downhole data uploads to ground system), frequency band in seven core armored cables 25KHz to 276KHz is taken, use pattern 7 (7,10 core) is used as down channel (ground system transmitting order to lower levels to downhole instrument), Frequency band takes 4KHz to 20KHz, and 5Khz is vacated as buffer strip in centre.So up-downgoing Channel Physical separates, and in cable The mode of seven cable core windings also ensure that it does not influence mutually, so as to avoid uplink and downlink signals in seven core armouring cable cores Mutually around.2nd, use pattern 5 is used as row of channels up and down, that is, sends and receives and take same channel, and signal will carry out frequency division multiplexing reality Existing full duplex communication, if this mode is applied in logging cable the spread of the rumours communication, it is necessary to add frequency using Echo Cancellation technology Filter-divider and echo canceller, the high-power clawback signal sent is offset in near-end.First way implements relatively simply, Discrete Multitone Modulation only need to be realized on independent physical channel, but this mode increases independent channel, it is impossible to Realize and use on single or three-core cable, and occupancy cable core quantity is more, by taking seven core armored cables as an example, pattern 5 needs 4 Root cable core, mode 7 need two.Second way cable core implements more complicated, Echo Cancellation skill therein using less Art in well logging business also without can be practical achievement.It is therefore, it is difficult to real using orthogonal frequency division multiplexi in practical logging Existing full duplex communication.At present in practical business, this problem is such as run into, generally using fractionation instrument string, the mode repeatedly gone into the well, It can not thus realize once to go into the well and obtain the achievement of total data.So as to add the time of business and fund input.

The content of the invention

Based on above mentioned problem, the invention provides a kind of high speed logging remote transmission communication side suitable for polytype cable Method, full duplex communication can be achieved on single and multicore cable.This method utilizes on the basis of orthogonal frequency division multiplexi Time-division multiplex technology realizes the full duplex communication on single channel, is used in single-core cable or multicore cable.

The present invention is achieved by the following technical solutions:

A kind of high speed logging remote transmission means of communication suitable for polytype cable, methods described are based on OFDM Technology, methods described utilize time orthogonal frequency division multiplexing technology, in the time orthogonal frequency division multiplexing technology, same channel timesharing Receive upstream data and downlink data;

It the described method comprises the following steps:

Unidirectional training:The data of multiframe first are sent to channel to be trained, and make ground instrument consistent with downhole instrument foundation Sampling clock and frame synchronization, while complete preliminary one-way channel measurement;

Two-way channel is trained:The two-way channel training includes the combined training of n times circulation, and the combined training is:

The data of M frames first training frame sequence is first sent to channel to be trained, and then sends K frame the second data training frames sequences Row are trained;

Exchange:The ground instrument and the downhole instrument according to the data of M frames first and the structure of the second data of K frames, By the repetition of P times, the exchange of ground instrument and downhole instrument information is realized;

Communication:After ground and underground get the configuration information of respective channel, configure and corresponding send and receive OFDM Modulation and demodulation parameter, so as to be transferred to normal transmission mode;

First data be upstream data and downlink data in one of, second data be upstream data and Another in downlink data;

Wherein N, M, K, P are positive integer.

Further, the combined training is specially:

First end equipment first sends the first data of M frames training frame sequence to send state, then continues at reception state;

After second end equipment receives M frames the first data training frames, transmission state is transferred to, sends the training of the second data of K frames Frame sequence;

First end equipment or the second end equipment carry out channel training in receive state, according to the information received;

First end equipment is one of ground instrument or downhole instrument, second end equipment be ground instrument or Another in downhole instrument.

Further, M, K value are according to the transmission rate being actually needed:

Further, methods described is applied to seven core cable, using the pattern of 2,3,5,6 cable cores composition as up-downgoing Shared channel;

Or methods described is applied to single-core cable or three-core cable.

Further, the ground instrument and the downhole instrument realize time-division orthogonal frequency division multiplexing under the control of a processor Use technology;The ground instrument and the downhole instrument realize communication, the simulation by analog switch and logging cable respectively Switch realizes the rapid translating for the pattern that sends and receives under the control of a processor;

In the transmit mode, the processor sends transmission training Buffer and OFDM to digital/analog converter and modulated, Digital/analog converter will send training Buffer and OFDM modulation conversions to be sent after transmission data frame to analog circuit, mould Sent after intending a pair of transmission data frame band filters of circuit to logging cable;

In the receiving mode, analog circuit two receives data from logging cable, by data receiver to analog/digital converter Changed, the data after conversion then reach processor to training Buffer and OFDM demodulation is received.

Further, the OFDM modulation and the OFDM demodulation are realized that the transmission Buffer and reception are instructed by FPGA Practice Buffer and use the ROM inside processor.

Further, the N takes 5000-10000;The P takes 1000-2000.

The advantageous effects of the present invention:

(1) present invention solves the problems, such as that logging cable distribution of cable core is few.In wireline logging, ground system passes through seven core armours Cable mounting logger is filled, transfers in open hole well or cased well, realizes the upload of downhole instrument information.Ground will simultaneously Downhole instrument is powered by cable, including alternating current and direct current.Using the present invention.Full duplex is realized on single channel Communication, part cable core can be reserved as power transmission.

(2) using the present invention, the full-duplex communication of ground and underground is realized on single channel, compared with conventional method (such as IQ systems of Halliburton Company of the U.S. etc.) Echo Cancellation circuit can be saved, the difficulty of system realization is reduced, improves system The stability of work.Therefore present invention could apply to the logging cable of the types such as single-core cable or three-core cable, system is improved While transmission rate of uniting, the physical channel resources such as cable core are saved.

(3) using the present invention, the modulation and demodulation of time-division OFDM are realized in single channel, although down channel occupies part The time slot of up channel.But in view of the asymmetry of logging cable the spread of the rumours up-downgoing communication.Appropriate selection M and K value, can be with Fully meet up big data transmission and descending order sending function.

Brief description of the drawings

Fig. 1, time-division OFDM flow charts of the invention;

Fig. 2, time-division OFDM modulation and demodulation functional block diagrams of the invention.

Embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and It is not used in the restriction present invention.

On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiied Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art Description can also understand the present invention completely.

Embodiment 1

The present invention provides a kind of high speed logging remote transmission means of communication suitable for polytype cable, and flow frame diagram is as schemed Shown in 1.The present embodiment makes ground instrument and downhole instrument synchronous by the use of up channel training as unidirectional training, accordingly with underground Instrument is as the first end equipment;

Apply to well logging rumour communication and specifically include following steps:

1st, after system electrification, up channel training is carried out first.Downhole instrument sends training Buffer by controlling, according to Predetermined frame structure, order send training frame sequence.The analog switch of downhole instrument processor control simultaneously, sets it to transmission mould Formula.

2nd, on ground system after electricity, the training frame sequence of underground transmission is waited.According to predetermined structure, complete to up channel Shake hands, measure, synchronization, channel measurement and bit distribution.

3rd, after certain amount of frame data, system is transferred to the two-way channel training stage, and now ground and underground are first Step completes up channel training, establishes consistent sampling clock and frame synchronization mechanism.Downhole instrument sends the frame of M number first Data, this process control simulation switch is sending mode.It is reception pattern that ground system, which controls local analog switch, simultaneously.

4th, after the upstream data frame end of M number, downhole instrument is transferred to reception pattern state, and ground system switchs to launch mould Formula state, ground system control transmitting training Buffer, according to predetermined frame structure, sequentially sends descending training frame sequence.In advance It is fixed to send K frame training sequences every time.This process repeats n times.During this, downhole instrument can obtain current downlink channel Metrical information, so that it is determined that downstream bits allocative decision.Ground system can obtain the measurement letter of current up channel simultaneously Breath, so as to further improve during previous step (one-way channel training) the up channel measurement result obtained.

5th, corresponding channel measurement has all been obtained by the process of n times (M+K) frame, ground and downhole instrument, together When the bit allocation scheme of subchannel is determined.System is transferred to exchange process.Ground and downhole instrument according to M frames upstream data and The structure of the downlink data of K frames, by the repetition of P times, realize the exchange of ground and down-hole information.

6th, after ground and underground get the configuration information of respective channel, configure the corresponding OFDM that sends and receives and modulate And demodulation parameter, so as to be transferred to normal transmission mode.

As shown in Fig. 2 for the time-division OFDM modulation and demodulation functional block diagram of logging remote transmission ground system, it is in processor Under control, the logging remote transmission for realizing time-division OFDM technology according to Fig. 1 flow communicates.Downhole instrument is similar.Wherein OFDM Modulation and demodulation are realized by FPGA, send and receive the ROM inside the usable processors of training Buffer.Analog circuit one Realize that transmitting and receiving band filters respectively with analog circuit two.Analog switch is realized send and receive under the control of a processor The rapid translating of pattern.

Wherein N and P selection:Because channel measurement needs to be calculated according to the substantial amounts of data frame received, it is The process of one statistics, under practical circumstances, for N Choice Theory, is the bigger the better, and N value is bigger, to the various dry of channel The more abundant of factor design is disturbed, the result for measuring to obtain is truer, but corresponding time of measuring is longer.N value is smaller, measurement Time can be very short, but more insufficient to the various factors of channel effect, it is impossible to the actual characteristic of channel of true reflection.This hair The bright number range in actually measuring from 5000 to 10000, can cause the measurement result of more secondary channels to have preferably Uniformity.More than 10000, channel measurement reaches unanimity, without significant change.P selection is according in practical work process The information content for needing to exchange selects, and controls substantially in 1000-2000 or so.N and P such selection, it is ensured that whole training Take in 60 seconds.

The above method is applied to seven core armored cables:

After the present invention proposes, reality is tested after improvement on original logging remote transmission system realized using OFDM technology Effect.

Original logging remote transmission system uses OFDM technology, on seven core armoured logging cables, uses two independent physics Passage realizes the full duplex communication of up-downgoing.The frequency band 25KHz of the wherein up pattern 5 formed using 2,3,5,6 cable cores is extremely 276KHz, the frequency band 4KHz to 20KHz of the descending mode 7 formed using 7,10 cable cores.Tested by early stage, as above enforcement mould Whole frequency bands (4KHz to 276KHz) of formula 5, actual measurement maximum transmission rate are 1.20Mbps.For the effect of the test present invention, change It is time-division OFDM modulation system to enter system architecture, the shared channel using the pattern 5 that 2,3,5,6 cable cores form as up-downgoing.

M=20, K=1 are set, on the basis of cable 1.2Mbps, theoretical calculation, maximum uplink rate 1.2Mbps*20/ 21=1.14Mbps, descending maximum rate 1.2Mbps*1/21=57.1kbps, during can meeting wireline logging completely, on The requirement of downlink data transmission.

Under experimental situation, the core armored cable of Huaneng Group seven of 7500 meters of connection carries out 5 connections, and actual acquisition is last Under rating results such as table:

Table 1, embodiment 1 are actual to obtain last rating results

Upstream rate is stable stable in more than 48kbps in more than 1Mbps, downstream rate.Meet imaging logging and conventional survey The requirement of well.

Analysis measured result (1Mbps) has the reason for gap to be with notional result (1.14Mbps):Pattern switching when Carve, the problem of selection due to cyclic prefix (CP) length, cause the last frame and the first of next pattern in switching Frame has hangover to disturb, and has an impact for the transmittability of present mode.Therefore the speed of up-downgoing is reduced.

Embodiment 2

The method of embodiment 1 is applied to the anti-hydrogen sulfide single-core cables of CAMESA

The frequency band of anti-hydrogen sulfide single-core cable is much narrower compared with seven core armored cables, and actual measurement single frequency band is from 2Khz to 150Khz Maximum transmission rate be 115kbps.For the effect of the test present invention, improvement system architecture is time-division OFDM modulation system, is made The shared channel of up-downgoing is used as by the use of single-core cable.

M=20, K=1 are set, on the basis of cable 115kbps, theoretical calculation, maximum uplink rate 115kbps*20/ 21=109.5kbps, descending maximum rate 115kbps*1/21=5.48kbps, during can meeting production well log completely Use requirement of the single-core cable for up-downgoing data transfer.

Under experimental situation, the anti-hydrogen sulfide cable of CAMESA singles of 7500 meters of connection, 5 connections are carried out, it is actual to obtain Last rating results such as table 2:

Table 2, embodiment 2 are actual to obtain last rating results

Upstream rate is stable stable in more than 5kbps in more than 90kbps, downstream rate.Meet production well log for list The transfer rate requirement of core cable.

Technology at this stage, the single-core cable the spread of the rumours used for producing well communicate, it is common to use Manchester's code or Person's Alternate Mark Inversion encoding technology, universal speed is in more than ten Kbps or tens kbps, and cable is longer, and transmission rate is lower.For 7500 meters Long cable, speed can only more than ten Kbps or so, and ground needs the solution harmonic ginseng by the human intervention of some time again Number configuration, just can be achieved, and also less stable during use.

It is applied to using the time-division OFDM technology of the present invention in single-core cable the spread of the rumours communication, single-core cable can be made full use of Bandwidth, under extremely narrow frequency band, realize up more than 90kbps, descending more than 5kbps full duplex communication.And in view of The characteristics of OFDM technology, there is adaptive channel using the WELL LOGGING CABLE TELECOMMUNICATION SYSTEM of the present invention, adaptive equalization and certain Error correcting capability.So as to improve the stability of the spread of the rumours system and reliability.

Embodiment 3

The present embodiment is substantially the same manner as Example 1, and difference is, the present embodiment is unidirectionally believed using down channel training Road is trained, and is using the instrument of ground system as the first end equipment, concrete mode accordingly:

1st, after system electrification, down channel training is carried out first.Ground system sends training Buffer by controlling, according to Predetermined frame structure, order send training frame sequence.The analog switch of ground system processor control simultaneously, sets it to transmission mould Formula.

2nd, on downhole instrument after electricity, the training frame sequence of ground transmission is waited.According to predetermined structure, complete to down channel Shake hands, measure, synchronization, channel measurement and bit distribution.

3rd, after certain amount of frame data, system is transferred to the two-way channel training stage, and now ground and underground are first Step completes descending training, establishes consistent sampling clock and frame synchronization mechanism.Ground system sends the frame number of M number first According to this process control simulation switch is sending mode.It is reception pattern that downhole instrument, which controls local analog switch, simultaneously.

4th, after the downlink data frame end of M number, ground system is transferred to reception pattern state, and downhole instrument switchs to launch mould Formula state, downhole instrument control transmitting training Buffer, according to predetermined frame structure, sequentially sends up training frame sequence.In advance It is fixed to send K frame training sequences every time.This process repeats n times.During this, ground system can obtain current up channel Metrical information, so that it is determined that upstream bits allocative decision.Downhole instrument in receive state, according to the information received previous On the basis of completing channel training in stage one-way channel training process, further channel measurement is carried out perfect.

5th, corresponding channel measurement has all been obtained by the process of n times (M+K) frame, ground and downhole instrument, together When the bit allocation scheme of subchannel is determined.System is transferred to exchange process.Ground and downhole instrument according to M frames downlink data and The structure of the upstream data of K frames, by the repetition of P times, realize the exchange of ground and down-hole information.

6th, after ground and underground get the configuration information of respective channel, configure the corresponding OFDM that sends and receives and modulate And demodulation parameter, so as to be transferred to normal transmission mode.

Claims (7)

1. a kind of high speed logging remote transmission means of communication suitable for polytype cable, methods described is based on OFDM skill Art, it is characterised in that methods described utilizes time orthogonal frequency division multiplexing technology, in the time orthogonal frequency division multiplexing technology, together One channel timesharing receives upstream data and downlink data;
It the described method comprises the following steps:
Unidirectional training:The data of multiframe first are sent to channel to be trained, and make ground instrument and downhole instrument foundation is consistent adopts Sample clock and frame synchronization, while complete preliminary one-way channel measurement;
Two-way channel is trained:The two-way channel training includes the combined training of n times circulation, and the combined training is:
The data of M frames first training frame sequence is first sent to channel to be trained, and is then sent the second data of K frames training frame sequence and is entered Row training;
Exchange:The ground instrument and the downhole instrument are according to the data of M frames first and the structure of the second data of K frames, by P Secondary repetition, realize the exchange of ground instrument and downhole instrument information;
Communication:After ground and underground get the configuration information of respective channel, configure the corresponding OFDM that sends and receives and modulate And demodulation parameter, so as to be transferred to normal transmission mode;
First data are one of in upstream data and downlink data, and second data are upstream data and descending Another in data;
Wherein N, M, K, P are positive integer.
2. method as claimed in claim 1, it is characterised in that the combined training is specially:First end equipment is first to send shape State sends the first data of M frames training frame sequence, then continues at reception state;
After second end equipment receives M frames the first data training frames, transmission state is transferred to, sends K frame the second data training frames sequences Row;
First end equipment or the second end equipment carry out channel training in receive state, according to the information received;
First end equipment is one of ground instrument or downhole instrument, and second end equipment is ground instrument or underground Another in instrument.
3. method as claimed in claim 1, it is characterised in that M, K value are according to the transmission rate being actually needed:
4. method as claimed in claim 1, it is characterised in that methods described is applied to seven core cable, using 2,3,5,6 cable core groups Into shared channel of the pattern as up-downgoing;
Or methods described is applied to single-core cable or three-core cable.
5. method as claimed in claim 1, it is characterised in that the control of the ground instrument and the downhole instrument in processor Under realize time orthogonal frequency division multiplexing technology;The ground instrument and the downhole instrument pass through analog switch and well logging electricity respectively Cable realizes communication, and the analog switch realizes the rapid translating for the pattern of sending and receiving under the control of a processor;
In the transmit mode, the processor sends transmission training Buffer and OFDM to digital/analog converter and modulated, number Word/analog converter will send training Buffer and OFDM modulation conversions to be sent after transmission data frame to analog circuit, simulation Sent after a pair of transmission data frame band filters of circuit to logging cable;
In the receiving mode, analog circuit two receives data from logging cable, and data receiver to analog/digital converter is carried out Conversion, the data after conversion then reach processor to training Buffer and OFDM demodulation is received.
6. method as claimed in claim 5, it is characterised in that the OFDM is modulated and the OFDM demodulation is realized by FPGA, institute State to send Buffer and receive training Buffer and use the ROM inside processor.
7. such as any methods describeds of claim 1-6, it is characterised in that the N takes 5000-10000;The P takes 1000- 2000。
CN201710714437.5A 2017-08-18 2017-08-18 The high speed logging remote transmission means of communication suitable for multiple types cable CN107610435B (en)

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US10329906B2 (en) * 2017-08-16 2019-06-25 Institute Of Geology And Geophysics, Chinese Academy Of Sciences Acoustic source testing apparatus of azimuthally acoustic logging while drilling (LWD) instrument

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