CN117927224A - High Wen Chaoshen logging cable communication system and method - Google Patents

Abstract

The invention provides a high Wen Chaoshen logging cable communication system and a method, wherein the system comprises a modulation and demodulation processing module, a logging bus interface module, a signal processing and driving module and a low-voltage direct-current power supply module, and uplink logging data or downlink control information is modulated, encoded and decoded through a downhole modulation and demodulation processing unit and an uphole modulation and demodulation data unit of the modulation and demodulation processing module, wherein the modulation and demodulation unit comprises a high-temperature digital signal processor DSP and a field programmable gate array FPGA; setting a logging bus interface module as a fusion data interaction interface of different logging instruments and a modulation-demodulation processing unit; the signal processing and cable driving module filters, conditions, converts and amplifies the data signals received by the communication cable signal coupling transformer. By adopting the system, the problems of low transmission speed and signal distortion in the prior art are solved, and the cable high-speed stable transmission of comprehensive logging data in a high Wen Chaoshen logging scene is realized.

Description

High Wen Chaoshen logging cable communication system and method

Technical Field

The invention relates to the technical field of oil and gas exploration logging, in particular to a high Wen Chaoshen logging cable communication system and a high Wen Chaoshen logging cable communication method, which are applied to the petroleum logging process and realize the technology of high-speed data interaction between a 7-core armored cable and a ground logging system based on downhole telemetry instruments.

Background

The petroleum logging technology is an important field of petroleum industry technology, is widely applied to different stages of oil and gas field exploration and development, and provides important data and data for searching and evaluating hydrocarbon reservoirs for petroleum geology and engineering technicians.

With the rapid development of logging instruments, logging has entered an imaging logging stage, where large amounts of downhole data need to be transmitted to the surface, requiring correspondingly high-profile equipment or optimized techniques. The cable data transmission system is used as an important component of the imaging logging system, and mainly completes high-speed, real-time and accurate transmission of a large amount of data between the logging ground instrument and the logging instrument, and is a 'throat' for logging data acquisition, transmission and control, and the transmission rate determines the development of logging equipment. On the other hand, with the continuous development of new logging theory and new methods, more and more information is required to be accurately uploaded in real time, and what method and technology are adopted to improve the speed of a logging cable data transmission system has become one of main problems in the development of logging instruments and equipment. The existing logging cable data transmission system has the problems of low transmission speed, small information quantity, signal attenuation, large distortion and the like, and in order to increase the transmission speed of information, research on the high-speed logging cable data transmission system plays an increasingly important role. Therefore, developing a high-speed data transmission system of a high-efficiency logging cable becomes a research direction of logging technology, and developing a high-speed data transmission system of the logging cable is also a key link for developing domestic imaging numerical control logging equipment. Therefore, the research of the high-speed data transmission system of the logging cable is developed, and the method has great practical significance.

Further, considering that in recent years, with the development of oil gas, low-quality reservoirs, shale oil, shale gas and other unconventional oil gas which are difficult to effectively exploit in the past are paid attention to, horizontal well development is a main production method, and a large number of service markets such as horizontal well logging, fracturing monitoring and the like are formed. High temperature and high speed cable communication systems are urgently needed in long-term horizontal well logging and high sampling rate fracture monitoring applications.

The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

In order to solve the problems, the invention provides a high Wen Chaoshen logging cable communication system which can effectively solve the problem of high-temperature and high-speed communication of logging instruments in a long-time high-temperature environment, so that the system can be applied to services such as high-temperature deep wells, horizontal well logging, fracturing monitoring and the like, can accurately and quickly realize uplink transmission of large-scale logging data and downlink transmission of control information, and plays a key role in upgrading a whole system. In one embodiment, the system comprises:

The system comprises a modem processing module, a communication cable, a ground data control center and a communication cable wellhead end, wherein the modem processing module comprises an underground modem processing unit and an uphole modem data unit, one side of the underground modem processing unit is connected with an ultra-deep logging instrument, the other side of the underground modem processing unit is connected with the communication cable deep well end, the uphole modem unit is connected with the ground data control center, and the other side of the uphole modem unit is connected with the communication cable wellhead end, so that uplink logging data or downlink control information is subjected to dual-modulation encoding and decoding processing; the modulation and demodulation unit comprises a high-temperature digital signal processor DSP and a field programmable gate array FPGA;

the logging bus interface module is connected between the modulation-demodulation processing unit and other different logging instruments and used as a fusion data interaction interface of the different logging instruments and the modulation-demodulation processing unit;

the signal processing and cable driving module is connected with a signal coupling transformer of the communication cable and is used for filtering, conditioning, converting and amplifying the received data signals;

And the low-voltage power supply module is used for providing low-voltage direct-current power supplies with various configurations for different functional structures of the system.

Optionally, the communication cable adopts a trillion-meter 7-core armored logging cable, the transmission mode 5 of the cable is used for transmitting data, and meanwhile, the transmission mode 7 is added to a data uploading channel as an expansion mode.

Further, the high-temperature digital signal processor in the modem unit controls the data signal to realize modulation and coding processing by adopting an ADSL (asymmetrical digital subscriber loop) modem algorithm, so that the data communication rate on a communication cable reaches over 1100 Kbps.

As a further improvement of the invention, before the high-temperature digital signal processor DSP of the modem unit is put into use, qualitative training of communication parameters is carried out according to the characteristics of the target communication cable, and the carrier frequency is adjusted according to the set amplitude range based on the training optimal result so as to determine the optimal target communication parameters, so that the communication state of the logging cable is optimal.

Preferably, the high-temperature digital signal processor DSP and the field programmable gate array FPGA perform modulation and demodulation processing on the data stream by adopting a discrete multi-audio modulation technology based on a parallel transmission mechanism, and are configured to perform the following operations:

dispersing the data stream information into a plurality of sub-carriers, and changing a single-path high-speed data stream with the bit rate of R into N sub-data streams with the bit rate of R/N;

A method of inserting a guard interval CP is employed, wherein the inserted guard interval is greater than a maximum spread delay of multipath.

On the other hand, the modem unit is provided with a modem parameter adjustment interface, and the parameters of the carrier start-stop frequency, the frequency width and/or the signal amplification factor of the modem unit are set in an intervening manner in response to a parameter adjustment instruction of a user.

Furthermore, the data interaction between the modem unit and other connected functional modules is realized by adopting a dual-port RAM interface based on a field programmable gate array FPGA.

In an alternative embodiment, the logging bus interface module adopts a network interface circuit with ARM as a core, and is configured with a twisted pair Ethernet bus interface, so that the ground network system and the downhole logging instrument network are in the same sub-network.

Preferably, the power supply and data transmission of the communication cable adopt a mode of sharing a cable core, and a cable core center tap for communication is used for transmitting signals of a main power supply, an auxiliary power supply or a reference electrode.

Based on the method described in any one or more of the above embodiments, the present invention further provides a method for high Wen Chaoshen logging cable communications, the method comprising:

for logging data or control data to be transmitted through the communication cable and from the communication cable, the modulation/demodulation processing module carries out modulation/coding/decoding processing according to the following logic:

When the cable inputs communication, the modulation and demodulation processing module reads data from the dual-port RAM in the FPGA and puts the data into the buffer area, the FPGA scrambles the data and performs forward error correction coding (FEC), the coded data is sent to the DSP for ADSL modulation, the modulated signal is converted into an analog signal, and finally the analog signal is sent to the cable signal transformer through the line driving interface;

When the cable outputs communication, the modulation and demodulation module receives analog signals from the cable, processes the analog signals through the analog signal processing circuit, converts the analog signals into digital signals, enters a buffer area in the FPGA, completes ADSL demodulation in the DSP to restore the digital signals into binary data, decodes and descrambles the binary data through forward error correction coding, restores the binary data into original data without scrambling codes, sends the original data into the buffer area, and reads the data from the buffer area through a communication interface by a data receiving end;

the system comprises a modem processing module, a logging bus interface module and a logging data processing module, wherein the modem processing module and different logging instruments realize fusion data interaction through the logging bus interface module;

After the signal coupling transformer of the communication cable receives the data signal, the signal processing and cable driving module is utilized to carry out filtering, conditioning, conversion and amplification processing on the data, and then the data is sent into the cable.

Based on other aspects of the method described in any one or more of the embodiments above, the present invention also provides a storage medium having stored thereon program code for implementing the method described in the embodiments above.

Compared with the closest prior art, the invention has the following beneficial effects:

The invention provides a high Wen Chaoshen logging cable communication system and a method, wherein the system comprises a modulation and demodulation processing module, a logging bus interface module, a signal processing and driving module and a low-voltage direct current power supply module, and uplink logging data or downlink control information is modulated and encoded through a downhole modulation and demodulation processing unit and an uphole modulation and demodulation data unit of the modulation and demodulation processing module, wherein the modulation and demodulation unit comprises a high-temperature digital signal processor DSP and a field programmable gate array FPGA, and all functional structures of the system can reliably work in an environment of 200 ℃; the high-temperature digital signal processor DSP has strong operational flexibility, and can perform processing parameter training configuration in advance, so that the accuracy of a data processing result is further ensured;

Further, a logging bus interface module is arranged and used as a fusion data interaction interface of different logging instruments and a modulation-demodulation processing unit; the signal processing and cable driving module filters, conditions, converts and amplifies the data signals received by the communication cable signal coupling transformer. The problem of signal distortion in the prior art is effectively solved, and real-time transmission and feedback with a ground control system can be realized aiming at mass data of logging instruments with various requirements.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:

FIG. 1 is a schematic diagram of a high Wen Chaoshen logging cable communications system according to one embodiment of the present invention;

FIG. 2 is a diagram of an example of a power signal common core loop connection in a high Wen Chaoshen logging cable communications system according to one embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a method of communicating a high Wen Chaoshen logging cable according to another embodiment of the present invention.

Detailed Description

The following will explain the embodiments of the present invention in detail with reference to the drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the implementation process of the technical effects, and implement the present invention according to the implementation process. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

Although a flowchart depicts operations as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. The order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.

The computer device includes a user device and a network device. Wherein the user equipment or client includes, but is not limited to, a computer, a smart phone, a PDA, etc.; network devices include, but are not limited to, a single network server, a server group of multiple network servers, or a cloud based cloud computing consisting of a large number of computers or network servers. The computer device may operate alone to implement the invention, or may access a network and implement the invention through interoperation with other computer devices in the network. The network in which the computer device is located includes, but is not limited to, the internet, a wide area network, a metropolitan area network, a local area network, a VPN network, and the like.

The terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms, and these terms are used merely to distinguish one element from another. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

In this regard, high-level configuration equipment or optimized techniques are required. The cable data transmission system is used as an important component of the imaging logging system, and mainly completes high-speed, real-time and accurate transmission of a large amount of data between the logging ground instrument and the logging instrument, and is a 'throat' for logging data acquisition, transmission and control, and the transmission rate determines the development of logging equipment. On the other hand, with the continuous development of new logging theory and new methods, more and more information is required to be accurately uploaded in real time, and what method and technology are adopted to improve the speed of a logging cable data transmission system has become one of main problems in the development of logging instruments and equipment. The existing logging cable data transmission system has the problems of low transmission speed, small information quantity, signal attenuation, large distortion and the like, and in order to increase the transmission speed of information, research on the high-speed logging cable data transmission system plays an increasingly important role. Therefore, developing a high-speed data transmission system of a high-efficiency logging cable becomes a research direction of logging technology, and developing a high-speed data transmission system of the logging cable is also a key link for developing domestic imaging numerical control logging equipment. Therefore, the research of the high-speed data transmission system of the logging cable is developed, and the method has great practical significance.

Further, considering that in recent years, with the development of oil gas, low-quality reservoirs, shale oil, shale gas and other unconventional oil gas which are difficult to effectively exploit in the past are paid attention to, horizontal well development is a main production method, and a large number of service markets such as horizontal well logging, fracturing monitoring and the like are formed. High temperature and high speed cable communication systems are urgently needed in long-term horizontal well logging and high sampling rate fracture monitoring applications.

In order to solve the above problems, the present invention provides a high Wen Chaoshen logging cable communication system and method, and provides a high Wen Momi logging cable communication device, which can be applied to services such as high temperature deep well, horizontal well logging and fracturing monitoring, etc., and uses a set modem processing module: modulating and encoding a digital signal to be transmitted to a cable into a data stream, converting the data stream into a corresponding modulated signal through a digital-to-analog chip, digitizing the cable signal after analog-to-digital conversion, and demodulating and restoring the cable signal into a corresponding data stream; the function of high-speed data communication between the underground logging instrument and a ground system through a trillion meter logging cable is realized, the underground logging instrument can reliably work in the environment of 200 ℃, and the communication speed can reach over 1100Kbps on the trillion meter 7-core armored logging cable; the device and the logging instrument adopt a 100Mbps twisted pair Ethernet bus interface, the ground network system and the underground logging instrument are in the same sub-network, the ground logging system can directly access the underground logging instrument through the network, and the logging instrument can also directly upload data to a ground host.

The detailed structure and principle of the system according to the embodiment of the present invention will be described in detail based on the drawings. Although a logical order of different structural process steps is described in the embodiments, in some cases the operations shown or described may be performed in a different order than is shown or described.

Example 1

Fig. 1 is a schematic structural diagram of a high Wen Chaoshen logging cable communication system according to a first embodiment of the present invention, and referring to fig. 1, it can be seen that the system includes:

the system comprises a modem processing module, a communication cable, a ground data control center and a communication cable wellhead end, wherein the modem processing module comprises an underground modem processing unit and an uphole modem data unit, one side of the underground modem processing unit is connected with an ultra-deep logging instrument, the other side of the underground modem processing unit is connected with the communication cable deep well end, the uphole modem unit is connected with the ground data control center, and the other side of the uphole modem unit is connected with the communication cable wellhead end to perform modulation and coding processing on uplink logging data or downlink control information;

the logging bus interface module is connected between the modulation-demodulation processing unit and other different logging instruments and used as a fusion data interaction interface of the different logging instruments and the modulation-demodulation processing unit;

the signal processing and cable driving module is connected with a signal coupling transformer of the communication cable and is used for filtering, conditioning, converting and amplifying the received data signals;

And the low-voltage power supply module is used for providing low-voltage direct-current power supplies with various configurations for different functional structures of the system.

The high Wen Chaoshen logging cable communication system in the embodiment provides a logging cable high-speed data communication device for the field of oilfield exploration and logging, and real-time high-speed data communication between underground logging instruments and a ground system through a universal meter logging cable is realized by utilizing a bus interface module, a modulation-demodulation processing module, a signal processing and driving module and a low-voltage direct-current power supply module.

Preferably, in one embodiment, the communication cable is a trillion 7-core armored logging cable;

In order to obtain a higher data transmission rate, besides using the transmission mode 5 of the cable to transmit data, the transmission mode 7 is used as an extension mode and is added to the data uploading channel to improve the transmission data rate. Thus, in an alternative embodiment, the present invention uses the cable's transmission mode 5 for data transmission while adding transmission mode 7 as an extension to the data upload channel. Mode 5 is used concurrently with mode 7 and the transmission data rate can be increased by 30%.

The invention modulates and codes the digital signal to be transmitted to the cable into data stream through the modulation and demodulation processing module, and converts the data stream into corresponding modulated signal through the digital-analog chip, and digitizes the cable signal after analog-digital conversion, demodulates and restores the cable signal into corresponding data stream.

In practical application, the modem processing module comprises an underground modem processing unit and an uphole modem data unit, wherein one side of the underground modem processing unit is connected with an ultra-deep logging instrument, one side of the underground modem processing unit is connected with a deep well end of a communication cable, one side of the uphole modem unit is connected with a ground data control center, and the other side of the uphole modem unit is connected with a wellhead end of the communication cable, and performs dual-modulation encoding and decoding processing on uplink logging data or downlink control information;

Further, in one embodiment, the modem unit includes a high-temperature digital signal processor DSP and a field programmable gate array FPGA, and the high-temperature digital signal processor controls and adopts an ADSL modem algorithm to implement modulation coding processing on the data signal, so that the data communication rate on the communication cable reaches over 1100 Kbps. In order to realize stable operation at a high temperature of 200 ℃, a digital signal processor DSP of an aerospace level is selected, and the digital signal processor mainly completes the modulation and demodulation functions of data streams.

On the other hand, before the high-temperature digital signal processor DSP of the modem unit is put into use, qualitative training of communication parameters is carried out according to the characteristics of the target communication cable, and parameters such as carrier frequency and the like are adjusted according to a set amplitude range based on a training optimal result so as to determine optimal target communication parameters, so that the communication state of the logging cable is optimal. The communication parameters may be set in practical application, and include carrier frequency, number of sub-bands, sub-band width, number of sub-band bits, etc.

When the method is applied, in one embodiment, the high-temperature digital signal processor DSP and the field programmable gate array FPGA perform modulation and demodulation processing on the data stream by adopting a discrete multi-audio modulation technology based on a parallel transmission mechanism, and the method is configured to perform the following operations:

dispersing the data stream information into a plurality of sub-carriers, and changing a single-path high-speed data stream with the bit rate of R into N sub-data streams with the bit rate of R/N;

A method of inserting a guard interval CP is employed, wherein the inserted guard interval is greater than a maximum spread delay of multipath.

Specifically, the digital signal processor DSP and the field programmable gate array FPGA are used for modulating and demodulating the data stream by adopting a discrete multitone modulation (DMT) technology, the technology adopts a parallel transmission mechanism, the information is dispersed into a plurality of subcarriers, a single-channel high-speed data stream with the bit rate of R is changed into N sub-data streams with the bit rate of R/N, the duration of a modulation symbol is prolonged to be larger than the expansion delay of a channel, thereby reducing the sensitivity of the system to the expansion delay, providing more favorable protection for the transmitted digital signal when larger distortion or burst interference occurs, and reducing intersymbol ISI interference suffered in a fading channel. In addition, the technology adopts a method of inserting a guard interval CP, wherein the inserted guard interval is larger than the maximum extension time delay of multipath, so that inter-symbol ISI interference and adjacent channel interference ICI caused by multipath effect are further eliminated, and orthogonality among sub-carriers is maintained.

Preferably, during uplink communication, the modulation function module reads data from the dual-port RAM in the FPGA and puts the data in the buffer, the FPGA carries out scrambling and Forward Error Correction (FEC) coding on the data, the coded data is sent to the DSP for ADSL modulation, the modulated signal is converted into an analog signal through D/A, and finally the analog signal is sent to the signal transformer through the line driving interface (power amplifying circuit and the like) and finally sent to the cable. Correspondingly, after receiving the analog signals transmitted from the underground, the ground modem module firstly processes the analog signals through an analog signal processing circuit, then converts the analog signals into digital signals through A/D conversion, then enters a buffer area in the FPGA, completes ADSL demodulation in the DSP, restores the digital signals into binary data, decodes and descrambles the binary data through forward error correction coding, restores the binary data into original data without scrambling codes and sends the original data to the buffer area, and an interface of the ground communication module reads the data from the buffer area and processes the data.

Further, in order to facilitate flexible intervention parameter setting, the modem unit is further provided with a modem parameter adjustment interface, and the parameter of the modem unit is set in an intervention manner in response to a parameter adjustment instruction of a user. In practical application, the modulation and demodulation functional module is provided with a manual adjustment interface for parameters such as carrier start-stop frequency, frequency width, signal amplification factor and the like.

In a preferred embodiment, the data interaction between the modem unit and other connected functional modules is realized by adopting a dual-port RAM interface based on a field programmable gate array FPGA.

In another aspect, in one embodiment, the logging bus interface module is used as a bus interface for data interaction with other logging instruments; a network interface circuit taking ARM as a core is adopted, and a twisted pair Ethernet bus interface is configured, so that a ground network system and a downhole logging instrument network are positioned in the same sub-network.

In a preferred embodiment, the tool bus interface module employs a twisted pair ethernet bus interface at a rate of up to 100Mbps. Preferably, a high-speed ARM processor is adopted, a PHY interface chip is matched, and an Ethernet data transparent transmission function is realized, namely, whenever an accessed logging instrument adopts a twisted pair Ethernet interface, no matter what application layer protocol is adopted, the logging instrument can be communicated with a ground system through the device. The underground logging system has the advantages that the ground system and the underground logging instrument are positioned in the same subnet, the ground logging system can directly access the underground logging instrument, and the logging instrument can also directly upload data to a ground host.

The signal processing and cable driving module is used for carrying out multistage band-pass filtering, signal amplification and analog-to-digital sampling processing on the analog signals received by the signal coupling transformer on the cable; carrying out power amplification on the modulated signal after digital-to-analog conversion, and coupling the modulated signal to a logging cable through a signal transformer;

The low-voltage power supply module is used for generating low-voltage direct-current power supplies of +5VDC, +/-12 VDC and the like required by the working of the logging instrument bus interface module, the modulation and demodulation processing module, the signal processing and cable driving module.

The invention uses full duplex frequency division multiplexing mode design, each sub-channel uses QAM modulation method, when in application, according to the characteristics of a 7-core cable of ten meters, the 4KHz to 150KHz frequency band is utilized to carry out uplink and downlink communication transmission, and according to the practical application conditions of small downlink data volume and large uplink data volume of logging, a small quantity of high-quality low-frequency sub-channels are used for transmitting issuing commands, and the rest of high-frequency sub-channels are used for uploading data.

In order to solve the limited limitation of the number of cable cores, the power supply and the data transmission adopt a mode of sharing the cable cores. The center tap of the cable core for communication can be used for transmitting signals of a main power supply, an auxiliary power supply or a reference electrode. Because the frequency of the power supply is different from that of the data signal, the cable core can be shared between the power supply and the signals, and all loops are skillfully connected by utilizing the balance principle, so that the signals can be simultaneously transmitted on the cable core and power can be supplied to underground instruments. For example, 1 core and 4 core of the 7-core cable can be set as main electric channels, and 2, 6 and 3, 5,7 and 10 are data transmission channels; meanwhile, the center taps of the 1, 4 cores and the 3, 5 cores are auxiliary electric channels, and the center taps of the 2, 6 cores are used as electrode loops, as shown in figure 2.

Further, it is considered that the quality of the cable channel has a great relation to the cable length. In the initialized training process, the modem functional module initially determines the used channel and the frequency for data transmission according to the quantitative characteristics of the tested universal cable, and on the basis, the optimal transmission channel is selected by calculating the signal-to-noise ratio (SNR) of each sub-channel, and the channel with poor quality is marked for not being used. Based on this information, the modem module also calculates the number of bits transmitted per subchannel.

In practical application, the transmitting end generally adopts a corresponding modulation mode for different subcarriers according to the gain condition of the subchannels, so that a more efficient mapping mode is adopted for channels with higher signal-to-noise ratios.

Based on this, by transmitting null pilot frequency to perform channel estimation to obtain channel and noise information, the transmitting end and the receiving end can obtain the gain of modulation symbol in each sub-channel, so that the optimal bit and power allocation scheme can be calculated based on the adaptive bit loading algorithm.

The cable channel transfer function is not changed rapidly, the modem module can perform self-adaptive channel estimation operation through the pilot frequency with the length of 1-2 frames, and the sending bit number of each sub-channel is calculated.

Preferably, the modem function module integrates channel estimation, modulation coding, interleaving, and bisects the frequency selective fading that occurs on the channel to the frequency bandwidth and interleaving depth of the entire signal. The burst random errors are dispersed by using an interleaving technology, the errors are further corrected by adopting a coding technology, so that the destroyed very severe data are recovered, and meanwhile, the decoding judgment is provided with more detailed channel information by using an estimation technology. In summary, these techniques make full use of the reliable data transmitted on the received subcarriers and their association with data on the severely fading subcarriers in order to effectively cope with frequency selective fading at the receiving end.

The high Wen Chaoshen logging cable communication system provided by the invention realizes the function of high-speed data communication between the underground logging instrument and the ground system through the trillion meter logging cable; the communication rate can reach over 1100Kbps on a ten-thousand-meter 7-core armored logging cable; the device can reliably work in the environment of 200 ℃; the device and the logging instrument adopt a 100Mbps twisted pair Ethernet bus interface; the ground network system and the underground logging instrument network are in the same sub-network, the ground logging system can directly access the underground logging instrument through the network, and the logging instrument can also directly upload data to a ground host.

In the high Wen Chaoshen logging cable communication system provided by the embodiment of the invention, each module or unit structure can independently operate or operate in a combined mode according to actual data acquisition requirements and processing requirements so as to achieve corresponding technical effects.

Example two

The system is described in detail in the embodiments disclosed in the present application, and based on the control application aspect of the system in any one or more of the embodiments, the present application further provides a high Wen Chaoshen logging cable communication method for controlling the operation of the high Wen Chaoshen logging cable communication system in any one or more of the embodiments. Specific examples are given below for details.

Specifically, fig. 3 shows a flow chart of a method for communicating a high Wen Chaoshen logging cable provided in an embodiment of the present invention, as shown in fig. 3, where the method includes:

for logging data or control data to be transmitted through the communication cable and from the communication cable, the modulation/demodulation processing module carries out modulation/coding/decoding processing according to the following logic:

When the cable inputs communication, the modulation and demodulation processing module reads data from the dual-port RAM in the FPGA and puts the data into the buffer area, the FPGA scrambles the data and performs forward error correction coding (FEC), the coded data is sent to the DSP for ADSL modulation, the modulated signal is converted into an analog signal, and finally the analog signal is sent to the cable signal transformer through the line driving interface;

When the cable outputs communication, the modulation and demodulation module receives analog signals from the cable, processes the analog signals through the analog signal processing circuit, converts the analog signals into digital signals, enters a buffer area in the FPGA, completes ADSL demodulation in the DSP to restore the digital signals into binary data, decodes and descrambles the binary data through forward error correction coding, restores the binary data into original data without scrambling codes, sends the original data into the buffer area, and reads the data from the buffer area through a communication interface by a data receiving end;

the system comprises a modem processing module, a logging bus interface module and a logging data processing module, wherein the modem processing module and different logging instruments realize fusion data interaction through the logging bus interface module;

After the signal coupling transformer of the communication cable receives the data signal, the signal processing and cable driving module is utilized to carry out filtering, conditioning, conversion and amplification processing on the data, and then the data is sent into the cable.

In practical application, a modulation and demodulation processing module is arranged and comprises an underground modulation and demodulation processing unit and an uphole modulation and demodulation data unit, wherein one side of the underground modulation and demodulation processing unit is connected with an ultra-deep logging instrument, one side of the underground modulation and demodulation processing unit is connected with a deep well end of a communication cable, one side of the uphole modulation and demodulation unit is connected with a ground data control center, and the other side of the uphole modulation and demodulation unit is connected with a well head end of the communication cable, and modulation and coding processing is carried out on uplink logging data or downlink control information;

the low-voltage direct-current power supply with various configurations is provided by different functional structures of the low-voltage power supply module.

Specifically, in an alternative embodiment, the communication cable adopts a trillion meter 7-core armored logging cable, the data is transmitted by using the transmission mode 5 of the cable, and meanwhile, the transmission mode 7 is added to the data uploading channel as an extension mode.

Further, in one embodiment, the modem unit includes a high-temperature digital signal processor DSP and a field programmable gate array FPGA, and the high-temperature digital signal processor controls and adopts an ADSL modem algorithm to implement modulation coding processing on the data signal, so that the data communication rate on the communication cable reaches over 1100 Kbps.

On the other hand, in one embodiment, before the high-temperature digital signal processor DSP of the modem unit is put into use, qualitative training of the communication parameters is performed according to the characteristics of the target communication cable, and the carrier frequency is adjusted according to the set amplitude range based on the training optimal result to determine the optimal target communication parameters, so that the communication state of the logging cable is optimal.

Specifically, in an alternative embodiment, the high-temperature digital signal processor DSP and the field programmable gate array FPGA perform modem processing on the data stream by using a discrete multi-audio modulation technology based on a parallel transmission mechanism, and are configured to perform the following operations:

dispersing the data stream information into a plurality of sub-carriers, and changing a single-path high-speed data stream with the bit rate of R into N sub-data streams with the bit rate of R/N;

A method of inserting a guard interval CP is employed, wherein the inserted guard interval is greater than a maximum spread delay of multipath.

As a further improvement of the invention, in one embodiment, the modem unit is provided with a modem parameter adjustment interface, and the carrier start-stop frequency, the frequency width and/or the signal amplification factor parameters of the modem unit are set in an intervening manner in response to a parameter adjustment instruction of a user.

Specifically, in one embodiment, a dual-port RAM interface based on a field programmable gate array FPGA is adopted between the modem unit and other connected functional modules to realize data interaction.

Further, in an embodiment, the logging bus interface module is configured to use a network interface circuit with an ARM as a core, and is configured with a twisted pair Ethernet bus interface, so that the ground network system and the downhole logging instrument network are in the same sub-network. Preferably, a high-speed ARM processor is adopted, a PHY interface chip is matched, and an Ethernet data transparent transmission function is realized, namely, whenever an accessed logging instrument adopts a twisted pair Ethernet interface, no matter what application layer protocol is adopted, the logging instrument can be communicated with a ground system through the device. The underground logging system has the advantages that the ground system and the underground logging instrument are positioned in the same subnet, the ground logging system can directly access the underground logging instrument, and the logging instrument can also directly upload data to a ground host.

On the other hand, in one embodiment, to address the limited number of cores, power and data transmission takes place in a shared manner with the cores. The center tap of the cable core for communication can be used for transmitting signals of a main power supply, an auxiliary power supply or a reference electrode. Because the frequency of the power supply is different from that of the data signal, the cable core can be shared between the power supply and the signal, and all loops are skillfully connected by utilizing the balance principle, so that the signal can be transmitted on the cable core and the power can be supplied to the underground instrument, the power supply and the data transmission of the communication cable adopt the mode of sharing the cable core, and the center tap of the cable core for communication is used for transmitting the signals of the main power supply, the auxiliary power supply or the reference electrode.

For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, but one of ordinary skill in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders or concurrently. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.

It should be noted that in other embodiments of the present invention, the method may also be used to obtain a new high Wen Chaoshen logging cable communication method by combining one or more of the above embodiments, so as to achieve high quality overall transmission of logging operation data signals.

It should be noted that, based on the method in any one or more of the foregoing embodiments of the present invention, the present invention further provides a storage medium, where a program code is stored on the storage medium, where the program code can implement the method in any one or more of the foregoing embodiments, and when executed by an operating system, can implement the high Wen Chaoshen logging cable communication method as described above.

The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims (11)

1. A high Wen Chaoshen logging cable communications system, the system comprising:

The system comprises a modem processing module, a communication cable well head and a communication cable well head, wherein the modem processing module comprises an underground modem processing unit and an uphole modem data unit, one side of the underground modem processing unit is connected with an ultra-deep logging instrument, the other side of the underground modem processing unit is connected with the deep well end of the communication cable, one side of the uphole modem unit is connected with the ground data control center, and the other side of the uphole modem unit is connected with the uphole end of the communication cable to perform modulation coding and decoding processing on uplink logging data or downlink control information; the modulation and demodulation unit comprises a high-temperature digital signal processor DSP and a field programmable gate array FPGA;

the logging bus interface module is connected between the modulation-demodulation processing unit and other different logging instruments and used as a fusion data interaction interface of the different logging instruments and the modulation-demodulation processing unit;

the signal processing and cable driving module is connected with a signal coupling transformer of the communication cable and is used for filtering, conditioning, converting and amplifying the received data signals;

And the low-voltage power supply module is used for providing low-voltage direct-current power supplies with various configurations for different functional structures of the system.

2. The system of claim 1, wherein the communication cable is a trillion meter 7 core armored logging cable, the data is transmitted using transmission mode 5 of the cable, and the transmission mode 7 is added as an extension to the data upload channel.

3. The system of claim 1 wherein the modem unit is controlled by the high temperature digital signal processor to implement a modulation and coding process on the data signal using an ADSL modem algorithm such that the data communication rate over the communication cable is over 1100 Kbps.

4. The system of claim 1, wherein the high temperature digital signal processor DSP of the modem unit performs qualitative training of the communication parameters according to the characteristics of the target communication cable before being put into use, and adjusts the carrier frequency according to the set amplitude range based on the training optimal result to determine the optimal target communication parameters so as to optimize the communication state of the logging cable.

5. The system of claim 3, wherein the high temperature digital signal processor DSP and the field programmable gate array FPGA employ a discrete multi-audio modulation technique based on a parallel transmission mechanism to modem the data stream configured to:

dispersing the data stream information into a plurality of sub-carriers, and changing a single-path high-speed data stream with the bit rate of R into N sub-data streams with the bit rate of R/N;

A method of inserting a guard interval CP is employed, wherein the inserted guard interval is greater than a maximum spread delay of multipath.

6. The system according to claim 1, wherein the modem unit is provided with a modem parameter adjustment interface for performing an intervening setting of the carrier start-stop frequency, frequency width and/or signal amplification parameters of the modem unit in response to a parameter adjustment instruction of a user.

7. The system of claim 1, wherein the modem unit and the other connected functional modules each use a dual-port RAM interface based on a field programmable gate array FPGA to implement data interaction.

8. The system of claim 1, wherein the logging bus interface module employs an ARM-centric network interface circuit configured with a twisted pair ethernet bus interface to enable the surface network system to be in the same sub-network as the downhole logging tool network.

9. The system of claim 1, wherein the power and data transmission of the communication cable is in a common cable core, and a center tap of the cable core for communication is used to transmit the primary power, the secondary power, or the reference electrode signal.

10. A method of high Wen Chaoshen logging cable communications, the method comprising:

for logging data or control data to be transmitted through the communication cable and from the communication cable, the modulation/demodulation processing module carries out modulation/coding/decoding processing according to the following logic:

When the cable inputs communication, the modulation and demodulation processing module reads data from the dual-port RAM in the FPGA and puts the data into the buffer area, the FPGA scrambles the data and performs forward error correction coding (FEC), the coded data is sent to the DSP for ADSL modulation, the modulated signal is converted into an analog signal, and finally the analog signal is sent to the cable signal transformer through the line driving interface;

When the cable outputs communication, the modulation and demodulation module receives analog signals from the cable, processes the analog signals through the analog signal processing circuit, converts the analog signals into digital signals, enters a buffer area in the FPGA, completes ADSL demodulation in the DSP to restore the digital signals into binary data, decodes and descrambles the binary data through forward error correction coding, restores the binary data into original data without scrambling codes, sends the original data into the buffer area, and reads the data from the buffer area through a communication interface by a data receiving end;

the system comprises a modem processing module, a logging bus interface module and a logging data processing module, wherein the modem processing module and different logging instruments realize fusion data interaction through the logging bus interface module;

After the signal coupling transformer of the communication cable receives the data signal, the signal processing and cable driving module is utilized to carry out filtering, conditioning, conversion and amplification processing on the data, and then the data is sent into the cable.

11. A storage medium having stored thereon program code for implementing the method of claim 10.