Vertical seismic sounding communication system

Abstract

The invention provides a vertical seismic sounding communication system, and relates to the technical field of communication, and the system employs a first ground transformer, a second ground transformer, a third ground transformer and a fourth ground transformer, and carries out the cascade coupling of the center tap of each transformer and the winding of the next stage of transformer through a unique topological structure. And high multiplexing of each cable core in the seven-core cable is realized. And more independent communication channels can be constructed on a limited seven-core cable physical medium. The problem that the communication rate and the data transmission capacity are limited due to the fact that the number of communication channels formed by seven-core cables in vertical seismic sounding in the prior art is small is solved.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to a vertical seismic sounding communication system. Background Technology

[0002] This invention relates to the field of wired communication technology, specifically to a high-speed communication system based on long cables for vertical seismic sounding operations. In vertical seismic sounding and other underground resource exploration activities, real-time and reliable transmission of large amounts of data is required between the surface system and downhole instruments. Seven-core cables, as the standard communication medium in this field, directly determine the data acquisition efficiency and operational performance of the entire logging system due to their carrying capacity. Therefore, improving the channel density and total data throughput per unit cable is a key technical issue of ongoing concern in this field.

[0003] In existing communication systems based on seven-core cables, a common technical solution is to combine some of the cable cores to construct one or a few communication channels. Specifically, two or more cores are typically selected and connected to corresponding transceiver circuits via an isolation transformer, thus forming a physical channel. This allocation and usage strategy is currently the mainstream approach for ensuring basic communication between the surface and underground. While some technologies attempt to improve this through optimized cable design, they still face numerous challenges in practical applications, such as the complexity and manufacturing difficulties of transformer ratio control, and signal crosstalk issues. These factors collectively limit communication quality and system reliability.

[0004] While the aforementioned existing technical solutions can establish a basic communication link, they fail to fully explore and utilize the potential communication capacity of the seven-core cable. This limited number of channels directly restricts the system's ability to transmit data in parallel. Therefore, there is an urgent need in the field for a new technical solution that can increase the number of available communication channels without altering the physical structure of the seven-core cable and while ensuring communication commands. Summary of the Invention

[0005] This application provides a vertical seismic sounding communication system to at least solve the problem that the number of communication channels composed of seven-core cables in the existing vertical seismic sounding system is small, which limits the communication rate and data transmission capability.

[0006] In the first aspect, this application provides a vertical seismic sounding communication system. The system uses a seven-core cable to construct four communication channels. The second and fifth cable cores are twisted together to form a first cable, the fourth cable core and the first cable core are twisted together to form a second cable, and the sixth and third cable cores are twisted together to form a third cable. The ground system includes a first, second, third and fourth ground transformer. One end of the first cable is connected to the first end of the first upper winding of the secondary side of the first ground transformer, and one end of the second cable is connected to the second end of the first lower winding of the secondary side of the first ground transformer. The second end of the first upper winding and the first end of the first lower winding are connected to form a first center tap. The first center tap is connected to the first end of the second upper winding of the second ground transformer, and one end of the third cable is connected to the second end of the second lower winding of the second ground transformer. The second end of the second upper winding and the first end of the second lower winding are connected to form the second center tap. The second center tap is connected to the first end of the third upper winding of the secondary side of the third ground transformer, and one end of the seventh cable core is connected to the second end of the third lower winding of the secondary side of the third ground transformer. The second end of the third upper winding and the first end of the third lower winding are connected to form the third center tap. One end of the armor of the seven-core cable is connected to the second end of the first winding of the secondary side of the fourth ground transformer, and the first end of the first winding is connected to the third center tap; the downhole system has a mirror-symmetric structure corresponding to the ground system, and the other end of each cable, the seventh cable core and the armor are connected to the downhole system.

[0007] Optionally, the vertical seismic sounding communication system further includes: a first capacitor and a first inductor; The first end of the first capacitor is connected to the third center tap, the second end of the first capacitor is connected to the first end of the first winding, the first end of the first inductor is connected to the first end of the first capacitor, and the second end of the first inductor is connected to the DC power supply.

[0008] Optionally, the turns ratio of the first upper winding to the first lower winding is 1:1, the turns ratio of the second upper winding to the second lower winding is 1:2, and the turns ratio of the third upper winding to the third lower winding is 1:6.

[0009] Optionally, the vertical seismic sounding communication system further includes: a first filter circuit, a second filter circuit, a third filter circuit, a fourth filter circuit, a fifth filter circuit, and a sixth filter circuit; The first end of the first filter circuit is connected to the fourth upper winding of the main side of the first ground transformer; the first end of the second filter circuit is connected to the fourth lower winding of the main side of the first ground transformer; the first end of the third filter circuit is connected to the second winding of the main side of the second ground transformer; the first end of the fourth filter circuit is connected to the third winding of the main side of the third ground transformer; the first end of the fifth filter circuit is connected to the fifth upper winding of the main side of the fourth ground transformer; and the first end of the sixth filter circuit is connected to the fifth lower winding of the main side of the fourth ground transformer. The first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit, the fifth filter circuit, and the sixth filter circuit are used to filter the signal.

[0010] Optionally, the vertical seismic sounding communication system further includes a control module, a first load circuit, a second load circuit, a third load circuit, a fourth load circuit, a fifth load circuit, and a sixth load circuit. The first port of the control module is connected to the second terminals of the first filter circuit, the second terminals of the second filter circuit, the second terminals of the third filter circuit, the second terminals of the fourth filter circuit, the second terminals of the fifth filter circuit, and the second terminals of the sixth filter circuit. The first filter circuit is connected to the fourth upper winding of the main side of the first ground transformer through the first load circuit. The second filter circuit is connected to the fourth lower winding of the main side of the first ground transformer through the second load circuit. The third filter circuit is connected to the second winding of the main side of the second ground transformer through the third load circuit. The fourth filter circuit is connected to the third winding of the main side of the third ground transformer through the fourth load circuit. The fifth filter circuit is connected to the fifth upper winding of the main side of the fourth ground transformer through the fifth load circuit. The sixth filter circuit is connected to the fifth lower winding of the main side of the fourth ground transformer through the sixth load circuit. The control module is used to monitor the crosstalk values ​​of the communication channels corresponding to the first ground transformer, the second ground transformer, the third ground transformer, and the fourth ground transformer, and adjust the impedance of the first load circuit, the second load circuit, the third load circuit, the fourth load circuit, the fifth load circuit, and the sixth load circuit according to the crosstalk values, so that the crosstalk value of each communication channel is less than a preset maximum crosstalk value and greater than a preset minimum crosstalk value.

[0011] Optionally, the vertical seismic sounding communication system further includes: a user interaction module; The output of the user interaction module is connected to the second end of the control module; The user interaction module is used to receive user control signals and send the user control signals to the control module; The control module is configured to communicate via a communication channel corresponding to the user control signal, based on the user control signal.

[0012] Optionally, the four communication channels corresponding to the first ground transformer, the second ground transformer, the third ground transformer, and the fourth ground transformer have the same signal transmission capability, and the signal that can be transmitted by any of the communication channels can be transmitted through any of the other communication channels.

[0013] In addition, this application also provides a vertical seismic sounding probe, which includes any of the above-mentioned vertical seismic sounding communication systems.

[0014] In addition, this application also provides a vertical seismic sounding device, which includes the above-mentioned vertical seismic sounding probe.

[0015] In addition, this application also provides a communication device, which includes any of the above-mentioned vertical seismic sounding communication systems.

[0016] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. By adopting the above technical solution, the system utilizes a first, second, third, and fourth ground transformer, and through a unique topology that cascades and couples the center taps of each transformer with the windings of the next-stage transformer, achieves a high degree of reuse of each core in the seven-core cable. This structure breaks through the traditional allocation method where one channel occupies a set of cores, enabling the construction of four independent communication channels on the limited physical medium of a seven-core cable. In this way, the system's channel density is significantly improved, thereby greatly increasing the number of data paths that can be transmitted in parallel without increasing cable costs or changing cable physical specifications. This provides a structural foundation for improving the overall communication rate and data throughput, effectively solving the problem of insufficient communication channels caused by low core utilization in existing technologies.

[0017] 2. By adopting the above technical solution, specific turns ratios of 1:1, 1:2, and 1:6 are set for the secondary windings of the first, second, and third ground transformers, respectively. This non-turns ratio configuration ensures the anti-attenuation and anti-interference performance of the communication channel during long-distance transmission. By configuring differentiated turns ratios for different channels, the system can specifically optimize the physical layer transmission characteristics of each channel, enabling the entire communication system to ensure stable transmission of high-speed data channels and reliable transmission of critical low-speed signals in complex downhole environments, thereby improving the overall adaptability of the system.

[0018] 3. By adopting the above technical solution, a control module is introduced and connected to each filter circuit and load circuit. The control module can actively monitor the crosstalk value on each communication channel, and this real-time monitoring capability provides a closed-loop feedback mechanism for the system. When the monitored crosstalk value deviates from the preset range, the control module adjusts the impedance of the corresponding load circuit according to the crosstalk value. Since the impedance of the load circuit directly affects the load characteristics of the transformer, the system can actively and in real time compensate for and suppress crosstalk between channels, rather than passively relying on a fixed structure. This dynamic closed-loop control method enables the system to adapt to changes in crosstalk characteristics caused by changes in operating conditions such as cable aging and temperature changes, ensuring the long-term stability and reliability of communication quality.

[0019] 4. By adopting the above technical solution, the system adds a user interaction module and connects it to the control module. The user interaction module provides operators with an interface to directly configure communication channels. After receiving user control signals from the user interaction module, the control module can select and activate specific communication channels for communication. This design eliminates the dependence on fixed hardware wiring for channel selection and use, allowing for flexible configuration via software commands. Therefore, the system achieves software-based and dynamic channel configuration, enabling operators to quickly enable, disable, or recombine communication channels according to different tasks or channel states. This significantly improves the system's operational flexibility and rapid response to changing operating conditions, enhancing its scalability and practicality. Attached Figure Description

[0020] Figure 1 This is a structural block diagram of the first vertical seismic sounding communication system provided in the embodiments of this application; Figure 2 This is a structural block diagram of the second type of vertical seismic sounding communication system provided in the embodiments of this application; Figure 3 This is a structural block diagram of the third type of vertical seismic sounding communication system provided in the embodiments of this application; Figure 4 This is a structural block diagram of the fourth vertical seismic sounding communication system provided in the embodiments of this application; Figure 5 This is a structural block diagram of the fifth type of vertical seismic sounding communication system provided in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: First ground transformer - T1, Second ground transformer - T2, Third ground transformer - T3, Fourth ground transformer - T4, First inductor - T5, First capacitor - C1, Second inductor - T10, Second capacitor - C2, Control module - 301, User interaction module - 401, First filter circuit - 101, Second filter circuit - 102, Third filter circuit - 103, Fourth filter circuit - 104, Fifth filter circuit - 105, Sixth filter circuit - 106, Seventh filter circuit - 107, Eighth filter circuit - 1 08, Ninth Filter Circuit - 109, Tenth Filter Circuit - 110, Eleventh Filter Circuit - 111, Twelfth Filter Circuit - 112, First Load Circuit - 201, Second Load Circuit - 202, Third Load Circuit - 203, Fourth Load Circuit - 204, Fifth Load Circuit - 205, Sixth Load Circuit - 206, Seventh Load Circuit - 207, Eighth Load Circuit - 208, Ninth Load Circuit - 209, Tenth Load Circuit - 210, Eleventh Load Circuit - 211, Twelfth Load Circuit - 212. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0023] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0024] In the description of the embodiments of this application, the term "multiple" means two or more. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0025] This application provides a vertical seismic sounding communication system, referring to... Figure 1 , Figure 1This is a structural block diagram of the vertical seismic sounding communication system provided in the embodiments of this application. The vertical seismic sounding communication system uses a seven-core cable to construct four communication channels for communication between the surface system and the downhole system. The ground system includes: a first ground transformer T1, a second ground transformer T2, a third ground transformer T3, and a fourth ground transformer T4; The second and fifth cores of the seven-core cable are twisted together to form the first cable. One end of the first cable is connected to the first end of the first upper winding of the secondary side of the first ground transformer T1. The fourth and first cores of the seven-core cable are twisted together to form the second cable. One end of the second cable is connected to the second end of the first lower winding of the secondary side of the first ground transformer T1. The second end of the first upper winding is connected to the first end of the first lower winding, forming the first center tap of the secondary side of the first ground transformer T1. The first center tap is connected to the first end of the second upper winding of the secondary side of the second ground transformer T2. The sixth and third cores of the seven-core cable are twisted together to form the third cable. One end of the third cable is connected to the second end of the second lower winding of the secondary side of the second ground transformer T2. The second end of the second upper winding is connected to... The first end of the second lower winding is connected to form the second center tap of the secondary side of the second ground transformer T2. The second center tap is connected to the first end of the third upper winding of the secondary side of the third ground transformer T3. One end of the seventh core of the seven-core cable is connected to the second end of the third lower winding of the secondary side of the third ground transformer T3. The second end of the third upper winding is connected to the first end of the third lower winding, forming the third center tap of the secondary side of the third ground transformer T3. One end of the armor of the seven-core cable is connected to the second end of the first winding of the secondary side of the fourth ground transformer T4. The first end of the first winding is connected to the third center tap. Each of the first ground transformer T1, the second ground transformer T2, the third ground transformer T3, and the fourth ground transformer T4 corresponds to a communication channel. The downhole system has a mirror-symmetrical structure corresponding to the surface system, in which the other ends of each cable, the seventh cable core, and the armor are connected to the corresponding connection points in the downhole system. For details, please refer to Figure 1 The downhole system includes: the first downhole transformer T6, the second downhole transformer T7, the third downhole transformer T8, and the fourth downhole transformer T9; The other end of the first cable is connected to the first end of the sixth upper winding of the secondary side of the first underground transformer T6. The other end of the second cable is connected to the second end of the sixth lower winding of the secondary side of the first underground transformer T6. The second end of the sixth upper winding is connected to the first end of the sixth lower winding, forming the fourth center tap of the secondary side of the first underground transformer T6. The fourth center tap is connected to the first end of the seventh upper winding of the secondary side of the second underground transformer T7. The other end of the third cable is connected to the second end of the seventh lower winding of the secondary side of the second underground transformer T7. The second end of the seventh upper winding is connected to the first end of the seventh lower winding, forming the fifth center tap of the secondary side of the second underground transformer T7. The fifth center tap is connected to the first end of the eighth upper winding of the secondary side of the third underground transformer T8. The other end of the seventh cable core is connected to the second end of the eighth lower winding of the secondary side of the third underground transformer T8. The second end of the eighth upper winding is connected to the first end of the eighth lower winding, forming the sixth center tap of the secondary side of the third underground transformer T8. The other end of the armor of the seven-core cable is connected to the second end of the fourth winding of the secondary side of the fourth underground transformer T9. The first end of the fourth winding is connected to the sixth center tap. Among them, the first underground transformer T6, the second underground transformer T7, the third underground transformer T8 and the fourth underground transformer T9 each correspond to a communication channel. Specifically, the principle of multi-channel construction is as follows: This vertical seismic sounding communication system constructs four communication channels on a finite physical conductor using a cascaded coupled topology. Specifically, the first communication channel consists of a first surface transformer T1, a first downhole transformer T6, a first cable, and a second cable. The second communication channel consists of the first center tap of the first communication channel, a third cable, a second surface transformer T2, a second downhole transformer T7, and a fourth center tap. Similarly, the third communication channel consists of the second center tap of the second communication channel, a seventh cable core, a third surface transformer T3, a third downhole transformer T8, and a fifth center tap. The fourth communication channel consists of the third center tap of the third communication channel, the cable armor, a fourth surface transformer T4, a fourth downhole transformer T9, and a sixth center tap. By multiplexing the center tap of the preceding channel as part of the signal path of the following channel, the system achieves the goal of constructing four independent communication channels on a seven-core cable, significantly improving the utilization rate of the cable cores.

[0026] In summary, this system achieves the physical layering of channels by using the symmetrical center tap of the previous channel as an endpoint of the signal path of the next channel. This breaks through the limitations of traditional cable core allocation strategies, maximizes the utilization efficiency of the cable cores, and thus enables the construction of four communication channels on a seven-core cable.

[0027] Crosstalk suppression principle: The cascaded coupling structure of this system achieves channel multiplexing while its physical topology inherently integrates a feedforward active crosstalk suppression mechanism. The principle of this mechanism is illustrated using the crosstalk suppression process generated by the first channel on the second channel as an example: Crosstalk Source Extraction: During long-distance transmission, the first channel (carried by the first and second cables) generates common-mode voltage and current due to cable asymmetry or external electromagnetic interference. This common-mode component is the main source of crosstalk to other channels. On the secondary side of the first ground transformer T1, due to its center-tapped structure, the signal current flowing through the first center tap accurately reflects the magnitude of the common-mode current traveling through the first channel. Therefore, the first center tap serves as a precise sample for extracting crosstalk source signals.

[0028] Generation and injection of anti-crosstalk signal: According to the connection structure of this system, the common-mode component signal extracted from the first center tap is directly applied to the second upper winding of the second ground transformer T2. This signal current flows through the second upper winding, generating a canceling magnetic field in the core of the second ground transformer T2 according to the law of electromagnetic induction. The magnitude of this canceling magnetic field is proportional to the common-mode noise of the first channel. This canceling magnetic field further induces an anti-crosstalk voltage signal corresponding to the canceling magnetic field across the entire secondary winding of the second ground transformer T2 (including the second upper winding and the second lower winding).

[0029] Crosstalk cancellation: Simultaneously, the first channel induces the original crosstalk signal on the third cable carrying the second channel through spatial electromagnetic coupling. When the main signal of the second channel and this original crosstalk signal arrive at the secondary side of the second ground transformer T2, they will be superimposed with the locally injected anti-crosstalk voltage signal. By precisely designing the number of turns of the second upper and lower windings of the secondary side of the second ground transformer T2, it can be ensured that the generated anti-crosstalk signal has the same amplitude and opposite phase to the original crosstalk signal. Therefore, the two signals cancel each other out when superimposed on the secondary side of the transformer, thus actively and physically eliminating the crosstalk from the first channel before the main signal of the second channel is processed.

[0030] This crosstalk suppression principle also applies to subsequent cascaded channels, namely, crosstalk suppression of the second channel to the third channel, and crosstalk suppression of the third channel to the fourth channel, thereby ensuring the signal independence and integrity of the entire system under high channel density.

[0031] Preferably, the four communication channels corresponding to the first, second, third, and fourth ground transformers have the same signal transmission capability, meaning that any signal that can be transmitted through any of the other communication channels can also be transmitted through the other communication channels. This channel equality brings great flexibility to the application of the system.

[0032] In this embodiment, all four communication channels can communicate using Manchester encoding. Manchester encoding encodes both clock and data signals together in the transmitted signal, providing self-synchronization and making it highly suitable for reliable data transmission over long cables.

[0033] Based on this system architecture, flexible communication management of multiple downhole instruments can be achieved. For example, when instruments A, B, C, and D are deployed downhole, the system can be configured as follows: Parallel communication configuration: Instrument A can be assigned to the first communication channel, Instrument B to the second communication channel, Instrument C to the third communication channel, and Instrument D to the fourth communication channel. With this configuration, the ground system can simultaneously and independently transmit and receive data with four different downhole instruments, achieving multi-task parallel processing and significantly improving the overall efficiency of data acquisition.

[0034] Hybrid communication configuration: Alternatively, instrument A, requiring high bandwidth, can be assigned to the first communication channel for continuous communication, while instruments B and C, with smaller data volumes, can be shared on the second communication channel. In this case, the system uses a time-division multiplexing communication protocol on the second communication channel, communicating with instruments B and C in different time slices through polling. This configuration achieves on-demand allocation of channel resources.

[0035] In summary, this system not only increases the number of physical channels through its unique structure, but also enables flexible parallel or time-division communication between the four channels and multiple downhole instruments simultaneously due to the equal transmission capacity of each channel, thus efficiently adapting to the complex and ever-changing logging operation requirements.

[0036] Optionally, this scheme provides specific turns ratios for the upper and lower windings of each transformer secondary side, wherein the turns ratio of the first upper winding to the first lower winding is 1:1, the turns ratio of the second upper winding to the second lower winding is 1:2, and the turns ratio of the third upper winding to the third lower winding is 1:6.

[0037] Similarly, since the downhole system and the surface system are mirror-symmetric, in the downhole system, the turns ratio of the sixth upper winding to the sixth lower winding is 1:1, the turns ratio of the seventh upper winding to the seventh lower winding is 1:2, and the turns ratio of the eighth upper winding to the eighth lower winding is 1:6.

[0038] Optional, see reference Figure 2 The vertical seismic sounding communication system also includes: a first capacitor C1 and a first inductor T5; The first terminal of the first capacitor C1 is connected to the third center tap, the second terminal of the first capacitor C1 is connected to the first terminal of the first winding, the first terminal of the first inductor T5 is connected to the first terminal of the first capacitor C1, and the second terminal of the first inductor T5 is connected to the DC power supply.

[0039] Similarly, the vertical seismic sounding communication system also includes: a second capacitor C2 and a second inductor T10; The first end of the second capacitor C2 is connected to the sixth center tap, the second end of the second capacitor C2 is connected to the first end of the fourth winding, the first end of the second inductor T10 is connected to the first end of the second capacitor C2, and the second end of the second inductor T10 is connected to the power supply terminal of the downhole instrument.

[0040] When DC power is required, the DC power supply can be connected to the third center tap through the second terminal of the first inductor T5. At this time, the sheath is the negative terminal or ground, and the power is input to the second inductor T10 through the third center tap. The second terminal of the second inductor T10 is the power supply terminal for the downhole instruments.

[0041] The vertical seismic sounding communication system uses a first inductor T5 and a first capacitor C1 on the surface side, and a second inductor T10 and a second capacitor C2 symmetrically positioned on the downhole side. This structure connects the DC power supply to the third center tap via the first inductor T5, and utilizes the cable sheath as a loop to construct a complete DC power supply path. This path allows for stable transmission of DC power from the surface system to the downhole system, and provides operating voltage to the downhole instruments via the second inductor T10. Simultaneously, the first capacitor C1 and the second capacitor C2 are connected in series in the signal path of the fourth communication channel. This design cleverly integrates the DC power supply path with the AC signal path of the fourth communication channel, enabling the simultaneous carrying of DC power and high-frequency data signals on the same pair of conductors (i.e., the third / sixth center tap and the cable sheath). Therefore, this solution solves the problem of remote power supply for downhole instruments without requiring additional cable cores for dedicated power supply lines, further improving the resource utilization efficiency of the seven-core cable and simplifying the system wiring structure.

[0042] Optional, see reference Figure 3 The vertical seismic sounding communication system also includes: a first filter circuit 101, a second filter circuit 102, a third filter circuit 103, a fourth filter circuit 104, a fifth filter circuit 105, and a sixth filter circuit 106. The first end of the first filter circuit 101 is connected to the fourth upper winding of the main side of the first ground transformer T1; the first end of the second filter circuit 102 is connected to the fourth lower winding of the main side of the first ground transformer T1; the first end of the third filter circuit 103 is connected to the second winding of the main side of the second ground transformer T2; the first end of the fourth filter circuit 104 is connected to the third winding of the main side of the third ground transformer T3; the first end of the fifth filter circuit 105 is connected to the fifth upper winding of the main side of the fourth ground transformer T4; and the first end of the sixth filter circuit 106 is connected to the fifth lower winding of the main side of the fourth ground transformer T4. Similarly, since the downhole system and the surface system are mirror images of each other, the vertical seismic sounding communication system on the downhole system side also includes: the seventh filter circuit 107, the eighth filter circuit 108, the ninth filter circuit 109, the tenth filter circuit 110, the eleventh filter circuit 111 and the twelfth filter circuit 112. The first end of the seventh filter circuit 107 is connected to the ninth upper winding of the main side of the first downhole transformer T6; the first end of the eighth filter circuit 108 is connected to the ninth lower winding of the main side of the first downhole transformer T6; the first end of the ninth filter circuit 109 is connected to the fourth winding of the main side of the second downhole transformer T7; the first end of the tenth filter circuit 110 is connected to the fifth winding of the main side of the third downhole transformer T8; the first end of the eleventh filter circuit 111 is connected to the tenth upper winding of the main side of the fourth downhole transformer T9; and the first end of the sixth filter circuit 106 is connected to the tenth lower winding of the main side of the fourth surface transformer T9. Theoretically, if the turns ratio of the upper and lower windings of each transformer is ideal and the cable characteristics are completely uniform, then there will be no mutual interference between the communication channels. However, in actual physical implementation, due to the tolerances of the transformer winding process and the inconsistencies in the parameters of the long cable itself, small-scale signal crosstalk will inevitably occur between the channels.

[0043] When signals are transmitted from the cable to the receiving end (taking a ground system as an example), the main signals of each communication channel, as well as superimposed crosstalk signals, are coupled to the main windings through the secondary windings of their respective transformers. At this time, the first to sixth filter circuits connected to the outputs of each main winding process these signals. Each filter circuit is designed with specific passband and stopband characteristics. Its passband frequency range matches the spectrum of the main signal carried by the corresponding communication channel, while the stopband covers the main spectral range of signals that may crosstalk from other channels.

[0044] Therefore, when a mixed signal containing crosstalk passes through the filtering circuit, the main signal of the target channel can pass smoothly, while the crosstalk components identified as out-of-band signals are significantly attenuated or filtered out. By configuring corresponding filtering circuits on the receiving path of each channel, this system can effectively suppress residual crosstalk caused by physical non-ideals, thereby further improving the signal-to-noise ratio of each channel, ensuring the accuracy of data decoding, and enhancing the reliability of the entire communication system. The working principle is the same when the downhole system receives signals from the surface system.

[0045] Optional, see reference Figure 4 The vertical seismic sounding communication system also includes a control module 301, a first load circuit 201, a second load circuit 202, a third load circuit 203, a fourth load circuit 204, a fifth load circuit 205, and a sixth load circuit 206. The first port of the control module 301 is connected to the second terminals of the first filter circuit 101, the second terminal of the second filter circuit 102, the second terminal of the third filter circuit 103, the second terminal of the fourth filter circuit 104, the second terminal of the fifth filter circuit 105, and the second terminal of the sixth filter circuit 106. The first filter circuit 101 is connected to the fourth upper winding of the main side of the first ground transformer T1 through the first load circuit 201. The second filter circuit 102 is connected to the fourth lower winding of the main side of the first ground transformer T1 through the second load circuit 202. The third filter circuit 103 is connected to the second winding of the main side of the second ground transformer T2 through the third load circuit 203. The fourth filter circuit 104 is connected to the third winding of the main side of the third ground transformer T3 through the fourth load circuit 204. The fifth filter circuit 105 is connected to the tenth upper winding of the main side of the fourth ground transformer T4 through the fifth load circuit 205. The sixth filter circuit 106 is connected to the tenth lower winding of the main side of the fourth ground transformer T4 through the sixth load circuit 206.

[0046] Similarly, on the downhole system side, refer to Figure 5 The vertical seismic sounding communication system also includes: a seventh load circuit 207, an eighth load circuit 208, a ninth load circuit 209, a tenth load circuit 210, an eleventh load circuit 211, and a twelfth load circuit 212. The seventh filter circuit 107 is connected to the ninth upper winding of the main side of the first downhole transformer T6 through the seventh load circuit 207. The eighth filter circuit 108 is connected to the ninth lower winding of the main side of the first downhole transformer T6 through the eighth load circuit 208. The ninth filter circuit 109 is connected to the fifth winding of the main side of the second downhole transformer T7 through the ninth load circuit 209. The tenth filter circuit 110 is connected to the sixth winding of the main side of the third downhole transformer T8 through the tenth load circuit 210. The eleventh filter circuit 111 is connected to the tenth upper winding of the main side of the fourth downhole transformer T9 through the eleventh load circuit 211. The twelfth filter circuit 112 is connected to the tenth lower winding of the main side of the fourth downhole transformer T9 through the twelfth load circuit 212.

[0047] To address the dynamic signal crosstalk problem caused by factors such as non-ideal transformer winding ratio, cable aging, or changes in operating conditions, this application employs an adaptive tuning technique. The control module 301 continuously monitors the signal strength and quality of all communication channels. For example, when the crosstalk value of the first communication channel containing the first ground transformer T1 and the second ground transformer T6 exceeds a preset threshold, the control module 301 adjusts the impedance of the first load circuit 201 to make the crosstalk value of the first communication channel less than the preset maximum crosstalk value and greater than the preset minimum crosstalk value. Furthermore, the control module 301 can also simultaneously adjust the impedance value of the sixth load circuit 206 to control the crosstalk value of the first communication channel.

[0048] Furthermore, as a coordinated adjustment strategy, the control module 301 can also adjust the load circuits corresponding to other communication channels while adjusting the impedance value of the load circuit of the first communication channel. For example, it can simultaneously adjust the impedance value of the sixth load circuit 206 to work together to control the crosstalk value of the first communication channel. Through this active adjustment method, the system can dynamically compensate for crosstalk to adapt to changing operating conditions and ensure communication reliability.

[0049] Through the aforementioned adaptive tuning technology, this system can dynamically compensate for crosstalk introduced by factors such as component aging, temperature drift, and changes in cable characteristics, ensuring that the communication system maintains stable performance with high signal-to-noise ratio and low bit error rate throughout its entire life cycle and under varying working environments.

[0050] Optional, see reference Figure 4 The vertical seismic sounding communication system also includes: a user interaction module 401; The output of the user interaction module 401 is connected to the second end of the control module 301; User interaction module 401 is used to receive user control signals and send the user control signals to control module 301; The control module 301 is used to configure a communication channel corresponding to the user control signal for communication based on the user control signal.

[0051] Specifically, the user interaction module 401 provides a user-friendly interface. Through this interface, the user can assign one or more of several different downhole instruments (e.g., instrument A, instrument B, instrument C, etc.) to one of the system's four physical communication channels.

[0052] User interaction module 401 receives user control signals and sends user control signals containing channel and instrument allocation relationships to control module 301. Control module 301 is used to configure a communication channel corresponding to the user control signal to achieve communication with the designated instrument.

[0053] Example 1: Parallel Communication Among Multiple Instruments When there are multiple instruments downhole that require independent, high-bandwidth communication, such as instrument A and instrument B, the user can configure the following on the user interaction module 401: Assign instrument A to the first communication channel.

[0054] Assign instrument B to the second communication channel.

[0055] After receiving this configuration signal, the control module 301 will establish two parallel communication links, enabling the ground system to interact with instrument A through the first communication channel and with instrument B through the second communication channel, thus realizing parallel transmission of data streams between multiple instruments without interference.

[0056] Example 2: Multi-instrument time-sharing single-channel communication When there are multiple instruments downhole with small data volumes or high non-real-time requirements, such as instrument C and instrument D, the user can perform the following configuration on the user interaction module 401: Instruments C and D are both assigned to the third communication channel.

[0057] Upon receiving this configuration signal, the control module 301 will automatically initiate a time-division multiplexing communication protocol on the channel. The control module 301 will communicate with instrument C and instrument D at different times according to a preset time-slice polling mechanism, thereby achieving time-division multiplexing of a single physical channel by multiple low-speed instruments and effectively saving channel resources.

[0058] By introducing the user interaction module 401 and corresponding software control logic, this system enables flexible configuration of the mapping relationship between channel resources and downhole instruments. Operators can easily achieve parallel communication of "one channel to one instrument" or time-division shared communication of "one channel to multiple instruments" according to operational needs. This allows the four physical channels to simultaneously provide flexible and efficient communication services to multiple different downhole instruments, greatly enhancing the system's task adaptability and resource management efficiency.

[0059] In addition, this application also provides a vertical seismic sounding probe, which includes a vertical seismic sounding communication system.

[0060] In addition, this application also provides a vertical seismic sounding device, which includes a vertical seismic sounding probe.

[0061] In addition, this application also provides a communication device, which includes a vertical seismic sounding communication system.

[0062] The above description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Other embodiments of this disclosure will be readily apparent to those skilled in the art upon consideration of the specification and the disclosure of practical truths.

[0063] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art that are not described in this disclosure.

Claims

1. A vertical seismic sounding communication system, characterized in that, The system uses a seven-core cable to construct four communication channels. The second and fifth cores are twisted together to form the first cable, the fourth core and the first core are twisted together to form the second cable, and the sixth core and the third core are twisted together to form the third cable. The ground system includes the first, second, third and fourth ground transformers. One end of the first cable is connected to the first end of the first upper winding of the secondary side of the first ground transformer, and one end of the second cable is connected to the second end of the first lower winding of the secondary side of the first ground transformer. The second end of the first upper winding and the first end of the first lower winding are connected to form a first center tap. The first center tap is connected to the first end of the second upper winding of the second ground transformer, and one end of the third cable is connected to the second end of the second lower winding of the second ground transformer. The second end of the second upper winding and the first end of the second lower winding are connected to form the second center tap. The second center tap is connected to the first end of the third upper winding of the secondary side of the third ground transformer, and one end of the seventh cable core is connected to the second end of the third lower winding of the secondary side of the third ground transformer. The second end of the third upper winding and the first end of the third lower winding are connected to form the third center tap. One end of the armor of the seven-core cable is connected to the second end of the first winding of the secondary side of the fourth ground transformer, and the first end of the first winding is connected to the third center tap; the downhole system has a mirror-symmetric structure corresponding to the ground system, and the other end of each cable, the seventh cable core and the armor are connected to the downhole system.

2. The vertical seismic sounding communication system according to claim 1, characterized in that, The vertical seismic sounding communication system further includes: a first capacitor and a first inductor; The first end of the first capacitor is connected to the third center tap, the second end of the first capacitor is connected to the first end of the first winding, the first end of the first inductor is connected to the first end of the first capacitor, and the second end of the first inductor is connected to the DC power supply.

3. The vertical seismic sounding communication system according to claim 1, characterized in that, The turns ratio of the first upper winding to the first lower winding is 1:1, the turns ratio of the second upper winding to the second lower winding is 1:2, and the turns ratio of the third upper winding to the third lower winding is 1:

6.

4. The vertical seismic sounding communication system according to claim 3, characterized in that, The vertical seismic sounding communication system further includes: a first filter circuit, a second filter circuit, a third filter circuit, a fourth filter circuit, a fifth filter circuit, and a sixth filter circuit; The first end of the first filter circuit is connected to the fourth upper winding of the main side of the first ground transformer; the first end of the second filter circuit is connected to the fourth lower winding of the main side of the first ground transformer; the first end of the third filter circuit is connected to the second winding of the main side of the second ground transformer; the first end of the fourth filter circuit is connected to the third winding of the main side of the third ground transformer; the first end of the fifth filter circuit is connected to the fifth upper winding of the main side of the fourth ground transformer; and the first end of the sixth filter circuit is connected to the fifth lower winding of the main side of the fourth ground transformer. The first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit, the fifth filter circuit, and the sixth filter circuit are used to filter the signal.

5. The vertical seismic sounding communication system according to claim 4, characterized in that, The vertical seismic sounding communication system also includes a control module, a first load circuit, a second load circuit, a third load circuit, a fourth load circuit, a fifth load circuit, and a sixth load circuit. The first port of the control module is connected to the second terminals of the first filter circuit, the second terminals of the second filter circuit, the second terminals of the third filter circuit, the second terminals of the fourth filter circuit, the second terminals of the fifth filter circuit, and the second terminals of the sixth filter circuit. The first filter circuit is connected to the fourth upper winding of the main side of the first ground transformer through the first load circuit. The second filter circuit is connected to the fourth lower winding of the main side of the first ground transformer through the second load circuit. The third filter circuit is connected to the second winding of the main side of the second ground transformer through the third load circuit. The fourth filter circuit is connected to the third winding of the main side of the third ground transformer through the fourth load circuit. The fifth filter circuit is connected to the fifth upper winding of the main side of the fourth ground transformer through the fifth load circuit. The sixth filter circuit is connected to the fifth lower winding of the main side of the fourth ground transformer through the sixth load circuit. The control module is used to monitor the crosstalk values ​​of the communication channels corresponding to the first ground transformer, the second ground transformer, the third ground transformer, and the fourth ground transformer, and adjust the impedance of the first load circuit, the second load circuit, the third load circuit, the fourth load circuit, the fifth load circuit, and the sixth load circuit according to the crosstalk values, so that the crosstalk value of each communication channel is less than a preset maximum crosstalk value and greater than a preset minimum crosstalk value.

6. The vertical seismic sounding communication system according to claim 5, characterized in that, The vertical seismic sounding communication system also includes: a user interaction module; The output of the user interaction module is connected to the second end of the control module; The user interaction module is used to receive user control signals and send the user control signals to the control module; The control module is configured to communicate via a communication channel corresponding to the user control signal, based on the user control signal.

7. The vertical seismic sounding communication system according to claim 1, characterized in that, The four communication channels corresponding to the first ground transformer, the second ground transformer, the third ground transformer, and the fourth ground transformer have the same signal transmission capability, and any signal that can be transmitted through any of the other communication channels can be transmitted through any of the other communication channels.

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