Logging device, data acquisition method of logging device and logging system

Abstract

The application discloses a kind of logging device, data acquisition method of logging device and logging system, comprising: ground system, for sending opening cable logging communication instruction to telemetry communication nipple through communication cable;Logging instrument, for collecting logging data, logging data is stored in the storage unit of itself, and simultaneously based on opening cable logging communication instruction, logging data is transmitted to telemetry communication nipple;Telemetry communication nipple receives and stores logging data, and simultaneously, logging data is transmitted to ground system in preset transmission format through communication cable.By realizing the function that logging data collected by logging instrument is stored in the storage unit of itself and transmitted to ground system through communication cable for storage, the technical problem of increasing time cost and logging cost caused by secondary logging when data loss occurs during downhole measurement in the prior art is solved, and the technical effect of improving logging stability and success rate is realized.

Description

Logging equipment, data acquisition methods for logging equipment, and logging systems Technical Field

[0001] The embodiments of the present invention relate to the field of geological exploration technology, and in particular to a logging device, a data acquisition method for the logging device, and a logging system. Background Technology

[0002] Currently, many wells in China experience extremely high downhole temperatures and pressures, creating harsh working environments for instruments. Prolonged exposure downhole can lead to data errors, intermittent operation, or even complete malfunction, and in severe cases, damage to the instrument's storage unit and probe. Therefore, these demanding well conditions necessitate minimizing the time instruments spend downhole.

[0003] However, during the logging process, after the logging instrument is sent down into the well, the collected logging data is usually stored directly in the logging instrument. Since the logging environment is an extremely harsh underground environment with high temperatures, if any malfunction occurs during the operation of the logging instrument, resulting in the loss of logging data, it cannot be detected immediately at the time of collection. It can only be known after the logging process is completed and the logging instrument returns to the surface. Once data loss occurs, the logging instrument must be sent down into the well again to remeasure, which not only prolongs the logging time but also increases the logging cost. Summary of the Invention

[0004] This invention provides a logging device, a data acquisition method for the logging device, and a logging system, which solves the technical problem of increased time and logging costs caused by the need for secondary logging when data is missing during downhole measurement in the prior art.

[0005] This invention provides a logging device, which includes a surface system, a communication cable, a telemetry communication sub, and at least one logging instrument equipped with a storage unit.

[0006] The ground system is connected to the telemetry communication sub-section via the communication cable, and the telemetry communication sub-section is connected to the logging instrument via a connector structure;

[0007] The ground system sends an activation command for cable logging communication to the telemetry communication sub-section via the communication cable.

[0008] The logging instrument is used to collect logging data, store the logging data in its own storage unit, and simultaneously transmit the logging data to the telemetry communication segment based on the command to activate cable logging communication.

[0009] The telemetry communication unit receives and stores the logging data, and simultaneously transmits the logging data to the ground system via the communication cable in a preset transmission format.

[0010] Furthermore, the ground system is also used to process the received well logging data in the preset transmission format using the maximum likelihood method.

[0011] Furthermore, the storage unit of the logging instrument includes a main storage subunit and a backup storage subunit;

[0012] The logging data collected by the logging instrument is stored simultaneously in the main storage subunit and the backup storage subunit.

[0013] Furthermore, the logging instrument also includes a logging unit, a power supply unit, and a communication unit;

[0014] The logging unit is used to collect the logging data;

[0015] The power supply unit is used to supply power to the communication unit, the storage unit, and the logging unit;

[0016] The communication unit is used to establish a communication connection between the logging instrument and the telemetry communication sub.

[0017] Furthermore, the power supply unit includes a main power supply subunit and a backup power supply subunit;

[0018] The main power supply subunit is used to supply power to the communication unit, the storage unit, and the logging unit;

[0019] The backup power subunit is used to provide auxiliary power to the communication unit, the storage unit, and the logging unit when the main power subunit is low on power.

[0020] Furthermore, the logging instrument also includes a storage configuration file, which is used to initialize the storage unit in the logging instrument on the ground, and to read the logging data in the storage unit after the logging instrument has completed data acquisition.

[0021] Furthermore, the telemetry communication segment includes a storage module, a power module, and a communication module;

[0022] The communication module is used to receive the well logging communication command to be activated by the ground system and send the well logging communication command to the well logging instrument. It is also used to receive the well logging data transmitted by all the well logging instruments in parallel, store the well logging data in the storage module, and transmit the well logging data to the ground system through the communication cable in the preset transmission format.

[0023] The power module is used to supply power to the storage module and the communication module.

[0024] Furthermore, the connector structure includes an upper connector and a lower connector;

[0025] The telemetry communication sub is connected to the upper connector of the target logging instrument via a lower connector, wherein the target logging instrument is the logging instrument that is directly connected to the telemetry communication sub;

[0026] The lower connector of the target logging instrument is used to connect to the upper connector of another logging instrument.

[0027] This invention also provides a data acquisition method for a logging device, which is applied to the logging device described in any of the above embodiments. The data acquisition method includes:

[0028] The ground system sends a command to activate cable logging communication to the telemetry communication sub-section via the communication cable;

[0029] The telemetry communication section sends the command to activate the cable logging communication to the logging instrument.

[0030] The logging instrument collects logging data, stores the logging data in its own storage unit, and simultaneously transmits the logging data to the telemetry communication segment based on the command to activate cable logging communication.

[0031] The telemetry communication unit receives and stores the logging data, and simultaneously transmits the logging data to the ground system via the communication cable in a preset transmission format.

[0032] This invention also provides a logging system, which includes the logging device described in any of the above embodiments.

[0033] This invention discloses a logging device, a data acquisition method for the logging device, and a logging system. The logging device includes: a surface system for sending an activation cable logging communication command to a telemetry communication sub-junction via a communication cable; a logging instrument for acquiring logging data, storing the logging data in its own storage unit, and simultaneously transmitting the logging data to the telemetry communication sub-junction based on the activation cable logging communication command; and a telemetry communication sub-junction for receiving and storing the logging data, and simultaneously transmitting the logging data to the surface system via a communication cable in a preset transmission format. This application solves the technical problem of increased time and logging costs caused by the need for secondary logging operations when data loss occurs during downhole measurement in existing technologies, by simultaneously storing the logging data acquired by the logging instrument in its own storage unit and transmitting it to the surface system for storage via a communication cable. This achieves the technical effect of improving logging stability and success rate. Attached Figure Description

[0034] Figure 1 is a structural diagram of a well logging device provided in an embodiment of the present invention;

[0035] Figure 2 is a structural diagram of another logging device provided in an embodiment of the present invention;

[0036] Figure 3 is a flowchart of a data acquisition method for a logging device provided in an embodiment of the present invention. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0039] Figure 1 is a structural diagram of a logging device provided in an embodiment of the present invention. As shown in Figure 1, the logging device includes a surface system 10, a communication cable 20, a telemetry communication sub 30, and at least one logging instrument 40 equipped with a storage unit 41. The surface system 10 is connected to the telemetry communication sub 30 via the communication cable 20, and the telemetry communication sub 30 is connected to the logging instrument 40 via a connector structure 50.

[0040] The surface system 10 sends an activation command for cable logging communication to the telemetry communication sub-section 30 via the communication cable 20; the logging instrument 40 is used to collect logging data, store the logging data in its own storage unit 41, and simultaneously transmit the logging data to the telemetry communication sub-section 30 based on the activation command for cable logging communication; the telemetry communication sub-section 30 receives and stores the logging data, and simultaneously transmits the logging data to the surface system 10 via the communication cable 20 in a preset transmission format.

[0041] Specifically, before the logging instruments 40 are lowered into the well for measurement, each logging instrument 40 will activate its storage mode and be connected in a bamboo-like configuration as shown in Figure 1. The telemetry communication sub-section 30 is connected to the surface system 10 via the communication cable 20. Figure 1 exemplarily shows the connection between the telemetry communication sub-section 30 and one logging instrument 40. In actual logging, multiple logging instruments 40 will be connected sequentially. After the logging instruments 40 are lowered into the well, the surface system 10 sends an "Activate Cable Logging Communication" command to the telemetry communication sub-section 30 via the communication cable 20, causing the logging instruments 40 to enter the cable logging mode. During this time, the storage mode is not interrupted, and the logging instruments 40 operate simultaneously in both modes until the surface system 10 sends a "Stop Cable Logging Communication" command. At this point, the logging instruments 40 exit the cable logging mode and operate only in the storage mode.

[0042] After the logging instrument 40 is lowered into the well and enters the cable logging working mode based on the activation command for cable logging communication issued by the telemetry communication sub-section 30, logging data will be collected. On the one hand, in storage working mode, the logging instrument 40 will store the logging data in its own storage unit 41. On the other hand, in cable logging working mode, the logging instrument 40 will transmit the logging data to the telemetry communication sub-section 30, so that the telemetry communication sub-section 30 can transmit the logging data to the surface system 10 through the communication cable 20 in a preset transmission format. The preset transmission format can be a square wave or other formats with lower power requirements; no specific restrictions are imposed here.

[0043] For example, taking a square wave as the preset transmission format, after the logging instrument 40 acquires relevant logging data, it generates a square wave signal containing the logging data. This signal is then transmitted from the communication cable 20 to the surface system 10 via the telemetry communication sub 30. In existing technologies, traditional QAM (Quadrature Amplitude Modulation) is generally used to transmit data. The logging data is modulated into a sine wave downhole and then transmitted to the surface system for demodulation to address the data distortion problem caused by long-distance transmission. However, QAM has the problem that at high temperatures, the heating of electronic components leads to significant nonlinear misalignment, adding considerable noise to the carrier signal. This causes distortion from the moment the modulated wave is emitted. Furthermore, during ultra-long-distance transmission, thermal noise and harmonics generated by parasitic capacitance in the cable are superimposed on the transmitted signal, causing significant changes in the amplitude of the signal received by the surface system, making it difficult to reflect the actual downhole information. In addition, QAM transmission requires a high-power, high-frequency signal source to provide the fundamental wave, which greatly increases the power consumption of the logging instrument and reduces its effective operating time. In this embodiment of the invention, square waves are used for transmission. The advantages of square wave transmission are that it requires less power and has low signal-to-noise ratio. The main power consumption occurs in the processing of square wave signals by the surface system. This reduces the power consumption of the logging instrument and the waste heat generated by the operation of power devices, thereby significantly extending the working time of the logging instrument in a single well run. In addition, the shape of the square wave is less prone to change than that of a high-frequency sine wave during long-distance transmission, and its amplitude is more stable, which also provides convenient conditions for subsequent processing of logging data.

[0044] It should be noted that existing logging tools are divided into storage-type tools and cable-based logging tools. These tools can store data in their own downhole storage unit or transmit data to the surface via cable. Since logging tools using different modes employ two different time-depth acquisition modes, their acquisition time-depth files are not shared. Therefore, when logging data from the two modes is played back and converted into curves in the surface system, different modes are usually used for processing. This makes it impossible for a single logging tool to simultaneously implement both storage and cable-based logging modes, meaning it cannot simultaneously store logging data in its own storage unit and transmit logging data to the surface system.

[0045] To address the mismatch between the acquisition time in storage mode and cable logging mode when the logging instrument 40 operates in both storage and cable logging modes, this embodiment employs a preset matching algorithm to match the acquisition times in storage and cable logging modes. For example, the preset matching algorithm can be a time-depth matching algorithm. When the logging instrument operates simultaneously in both storage and cable logging modes, the time-depth data from storage mode is used as the standard. Before the data from the logging instrument 40 is uploaded to the ground system 10 via the telemetry communication section 30, a time-depth correction is performed to update the data to the time-depth data from cable logging mode, thereby resolving the compatibility issue between storage and cable logging modes in terms of time-depth.

[0046] In this embodiment of the invention, by adopting the dual-mode working structure of the storage working mode and the cable logging working mode as described above, it is advantageous to perform logging in both cable transmission and storage modes simultaneously. This achieves the function of cable logging, which can obtain the downhole instrument working status and formation status in real time, while also having the advantages of storage logging, such as high stability, high accuracy and high success rate, even in extremely harsh logging environments.

[0047] This application solves the technical problem of increased time and logging costs caused by the need for secondary logging in the process of downhole measurement due to the inability to perform secondary logging when data is missing. It enables the logging instrument to simultaneously store logging data in its own storage unit and transmit it to the ground system for storage via a communication cable. This achieves the technical effect of improving logging stability and success rate.

[0048] Optionally, the surface system 10 is also used to process the received logging data in a preset transmission format using the maximum likelihood method.

[0049] Specifically, to address the problem of low signal processing speed in the ground system 10, this embodiment of the invention employs the maximum likelihood method as a solution for processing well logging data in a preset transmission format. For example, taking a square wave as the preset transmission format:

[0050] First, the surface system 10 sends a learning command, instructing the downhole logging instrument 40 to generate a high-level positive signal ("+1") and a negative signal ("-1"), which are then transmitted to the surface system 10 via the communication cable 20 for learning. During long-distance transmission, due to losses from ultra-long-distance transmission, the digital signal levels undergo severe distortion, becoming two approximately positively skewed curves. However, the positions of the original "+1" and "-1" levels with the highest probability can still be calculated using the maximum likelihood method. These positions are then compared with the standard "+1" and "-1" levels on the surface system 10. This aligns the timing of the data stored in the surface system 10 with the signal sequence transmitted via the communication cable 20, completing the learning process of the surface system 10 for the downhole transmission model. Furthermore, it pre-calculates all possible waveform shapes generated by various datasets (e.g., groups of digital signals) transmitted from the downhole to the surface system 10 after ultra-long-distance transmission.

[0051] Then, the square wave signal carrying logging data transmitted via communication cable 20 will also produce the same loss model curve as the previously used signal due to the same ultra-long-distance transmission. Since the timing of the data stored in the surface system 10 is already aligned with the downhole logging data during the learning process, the timing of the subsequent downhole signal is also aligned with the waveform template of the surface system 10. By subtracting it from various waveform templates, one waveform template will definitely achieve pattern matching with the waveform of this dataset, resulting in a low level ("0") after the subtraction. The original digital signal of this dataset template is stored in the surface system 10, and the band that is set to low level after the subtraction is clipped before processing the next curve segment. Through simulation verification, to meet the above functions, a dataset capacity of 3 is required to balance signal processing confidence and transmission speed.

[0052] In this embodiment of the invention, by using the maximum likelihood method for learning and processing the well logging data accordingly based on the learning results, it is possible to transmit square wave data through the same communication cable where the length variation is not significant relative to the total transmission length. By aligning the pre-generated template waveform with the time, and then comparing the data in groups with the template waveform, the deformed square wave information is converted into digital signals one by one, much like a movie reel. The communication speed is extremely fast, with a communication speed of up to 4 M bit / s (@9km depth) and 2 M bit / s (@13km depth) for uploading well logging data to the surface system, which is a significant improvement over traditional transmission methods.

[0053] Meanwhile, the maximum likelihood method enables the transmission and processing of large amounts of logging data to the surface in a short time, significantly reducing the necessary time for logging instruments to operate downhole, thereby significantly improving the success rate and data reliability of a single logging operation. Furthermore, for instruments requiring high precision and multiple probes, such as microresistivity imaging logging tools, this algorithm allows for the transmission of large amounts of data to the surface system in a short time. This enables compatibility with denser acquisition probes and larger data transmission volumes, allowing the surface system to obtain more detailed downhole detection data. This, in turn, helps improve the instrument's design resolution and greatly enhances its measurement capabilities.

[0054] Figure 2 is a structural diagram of another logging device provided in an embodiment of the present invention.

[0055] Optionally, as shown in Figure 2, the storage unit 41 of the logging instrument 40 includes a main storage subunit 411 and a backup storage subunit 412; the logging data collected by the logging instrument 40 is stored in both the main storage subunit 411 and the backup storage subunit 412.

[0056] Optionally, as shown in Figure 2, the logging instrument 40 also includes a logging unit 42, a power supply unit 43, and a communication unit 44; the logging unit 42 is used to collect logging data; the power supply unit 43 is used to supply power to the communication unit 44, the storage unit 41, and the logging unit 42; the communication unit 44 is used to realize the communication connection between the logging instrument 40 and the telemetry communication sub 30.

[0057] Optionally, as shown in Figure 2, the power supply unit 43 includes a main power supply subunit 431 and a backup power supply subunit 432; the main power supply subunit 431 is used to supply power to the communication unit 44, the storage unit 41, and the logging unit 42; the backup power supply subunit 432 is used to assist in supplying power to the communication unit 44, the storage unit 41, and the logging unit 42 when the power of the main power supply subunit 431 is insufficient.

[0058] Optionally, as shown in Figure 2, the logging instrument 40 also includes a storage configuration book 45, which is used to initialize the storage unit 41 in the logging instrument 40 on the ground, and to read the logging data in the storage unit 41 after the logging instrument 40 has completed data acquisition.

[0059] Specifically, the storage setup unit 45 is connected to the storage unit 41 in the logging instrument 40 via a USB setup cable 451. Before the logging instrument 40 is lowered into the well, the main storage subunit 411 and the backup storage subunit 412 are initialized through the storage setup unit 45, the storage working mode is started, the logging unit 42 begins to work, and the logging instrument 40 enters the working state. After being lowered into the well, the logging unit 42 measures various data downhole and simultaneously stores them in the main storage subunit 411 and the backup storage subunit 412. The communication unit 44 continuously decouples the information flow from the telemetry communication sub-section 30, determines the communication enable status of the ground system 10, and upon detecting the enable signal of the logging instrument 40 (i.e., the aforementioned command to start cable logging communication), the communication unit 44 puts the logging instrument into the cable logging working mode, running simultaneously with the storage working mode, and uploads the logging data in the main storage sub-unit 411 to the telemetry communication sub-section 30 through the connector structure 50 (i.e., the upper connector 501 and lower connector 502 shown in Figure 2). This working state continues until the communication unit 44 detects the enable signal to be turned off (i.e., the aforementioned command to stop cable logging communication), at which point the communication unit 44 stops uploading logging data to the telemetry communication sub-section 30, exits the cable logging working mode, and continues to run only the storage working mode.

[0060] The main power supply subunit 431 independently supplies power to the communication unit 44, the main storage subunit 411, the backup storage subunit 412, and the logging unit 42. If the voltage of the main power supply subunit 431 drops significantly due to insufficient battery power, the backup power supply subunit 432 will start supplying power to the above units as an auxiliary power source.

[0061] It should be noted that both the main power supply subunit 431 and the backup power supply subunit 432 only supply power to their respective logging instruments 40 and do not provide power to other adjacent logging instruments 40 or telemetry communication sub-units 30. After logging is completed, the logging instruments 40 are brought up into the well and disassembled in pairs. The logging data of the main storage subunit 411 and the backup storage subunit 412 are read and shut down through the storage settings unit 45. The read logging data is then imported into the surface system 10, thus obtaining the logging data obtained by the logging instruments 40 in downhole storage mode.

[0062] In this embodiment of the invention, by employing a dual-power, dual-storage logging instrument, if a failure is detected in the main storage subunit during logging data reading, resulting in incomplete logging data storage, the logging data can still be read from the backup storage subunit. This reduces the risk of logging failure due to a single storage unit malfunction. The dual power supply only powers the logging instrument itself; the backup power subunit provides power when the main power subunit's voltage is insufficient, ensuring that the logging instrument can still operate normally even when the main power subunit's downhole power is depleted.

[0063] Optionally, as shown in Figure 2, the telemetry communication section 30 includes a storage module 31, a power supply module 32, and a communication module 33. The communication module 33 is used to receive the start cable logging communication command sent by the ground system 10 and send the start cable logging communication command to the logging instrument 40. It is also used to receive logging data transmitted by all logging instruments 40 in parallel, store the logging data in the storage module 31, and simultaneously transmit the logging data to the ground system 10 through the communication cable 20 in a preset transmission format. The power supply module 32 is used to supply power to the storage module 31 and the communication module 33.

[0064] Specifically, the internal circuit system of the telemetry communication sub-section 30 consists of a storage module 31, a power supply module 32, and a communication module 33. The communication module 33 receives the command to activate cable logging communication from the surface system 10 and forwards it downlink to the communication unit 44 in the logging instrument 40 that requests to activate cable logging mode. When the logging instrument 40 is operating in cable logging mode, the communication unit 44 in the logging instrument 40, connected to the telemetry communication sub-section 30 and operating in cable logging mode, uploads logging data to the communication module 33 in the telemetry communication sub-section 30. The communication module 33 processes all logging data uploaded by the logging instruments 40 currently in cable logging mode in parallel and stores it in the storage module 31. Then, this logging data is synchronously uploaded to the surface system 10 via the communication cable 20 in a preset transmission format. During this process, the power supply module 32 independently supplies power to the storage module 31 and the communication module 33 in the telemetry communication sub-section 30, ensuring the normal operation of the telemetry communication sub-section 30.

[0065] Optionally, as shown in Figure 2, the connector structure 50 includes an upper connector 501 and a lower connector 502; the telemetry communication sub-section 30 is connected to the upper connector 501 of the target logging instrument through the lower connector 502, wherein the target logging instrument is a logging instrument 40 directly connected to the telemetry communication sub-section 30; the lower connector 502 of the target logging instrument is used to connect to the upper connector 501 of another logging instrument 40.

[0066] Specifically, the lower connector 502 of the telemetry communication sub-section 30 is a plug structure. Compared with the upper connector 501 of the logging instrument 40's socket structure, the core wires of the two are defined in a one-to-one correspondence and are mirror-symmetrical. When the lower connector 502 of the telemetry communication sub-section 30 and the upper connector 501 of the logging instrument 40 are plugged in one-to-one, it is possible to send and receive commands between adjacent instruments and to perform cross-instrument communication transmission. Similarly, the core wires of the upper connector 501 of the logging instrument 40's socket structure and the lower connector 502 of the plug structure are also defined in a one-to-one correspondence. This is beneficial for the free combination and connection or disassembly of the logging instruments 40, so that logging instruments 40 with corresponding functions can be freely combined and used for logging operations as needed. In addition, after the logging instruments 40 are connected by the corresponding plug-in structure 50, the outer shell of the logging instrument 40 needs to be installed together with anti-rotation blocks, key structures, and threaded ring structures to prevent serious accidents such as grouting and breakage at the connection point.

[0067] This invention also provides a data acquisition method for a logging device. Figure 3 is a flowchart of a data acquisition method for a logging device provided in this invention. This data acquisition method is applied to the logging device in any of the above embodiments. As shown in Figure 3, the data acquisition method specifically includes the following steps:

[0068] S301, the ground system sends an activation command for cable logging communication to the telemetry communication sub via the communication cable;

[0069] S302, the telemetry communication section will activate the cable logging communication command to be sent to the logging instrument;

[0070] S303: The logging instrument collects logging data, stores the logging data in its own storage unit, and simultaneously transmits the logging data to the telemetry communication sub based on the command to activate cable logging communication.

[0071] S304, the telemetry communication sub-section, receives and stores logging data, and simultaneously transmits the logging data to the surface system via a communication cable in a preset transmission format.

[0072] Specifically, before the logging instruments are deployed to the well for measurement, each logging instrument will activate its storage mode. The telemetry communication sub is connected to the surface system via a communication cable. The surface system sends an "Activate Cable Logging Communication" command to the telemetry communication sub via the communication cable, causing the logging instrument to enter cable logging mode. During this time, the storage mode remains uninterrupted, and the logging instrument operates in both modes simultaneously until the surface system sends a "Stop Cable Logging Communication" command. At this point, the logging instrument exits cable logging mode and operates only in storage mode. After the logging instrument is deployed and enters cable logging mode based on the "Activate Cable Logging Communication" command issued by the telemetry communication sub 30, it will collect logging data. On one hand, in storage mode, the logging instrument stores the logging data in its own storage unit. On the other hand, in cable logging mode, the logging instrument transmits the logging data to the telemetry communication sub, enabling the telemetry communication sub to transmit the logging data to the surface system via the communication cable in a preset transmission format.

[0073] The data acquisition method of the logging device provided in this embodiment of the invention has the same technical features as the logging device provided in the above embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0074] This invention also provides a logging system, which includes the logging device in any of the above embodiments.

[0075] The logging system provided in this embodiment of the invention includes the logging device in the above embodiment. Therefore, the logging system provided in this embodiment of the invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0076] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0077] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A well logging device, characterized in that, The logging device includes a surface system, a communication cable, a telemetry communication sub, and at least one logging instrument equipped with a storage unit. The surface system is connected to the telemetry communication sub via the communication cable, and the telemetry communication sub is connected to the logging instrument via a connector structure. The surface system sends an activation command for cable logging communication to the telemetry communication sub via the communication cable. The logging instrument is used to collect logging data and, in storage mode, stores the logging data in its own storage unit. Simultaneously, in cable logging mode, it transmits the logging data to the telemetry communication sub based on the activation command for cable logging communication. The logging instrument employs a preset matching algorithm. The method is used to match the acquisition time of the storage working mode and the cable logging working mode; wherein, the preset matching algorithm is a time-depth matching algorithm. When the logging instrument is working simultaneously in the storage working mode and the cable logging working mode, the time-depth of the storage working mode is used as the standard. Before the logging data is uploaded to the surface system through the telemetry communication sub, a time-depth correction is performed to update it to the time-depth data of the cable logging working mode; the telemetry communication sub receives and stores the logging data, and at the same time transmits the logging data to the surface system through the communication cable in a preset transmission format, wherein the preset transmission format is a square wave or other format with a power lower than a set value.

2. The logging device according to claim 1, characterized in that, The surface system is also used to process the received well logging data in the preset transmission format using the maximum likelihood method.

3. The logging device according to claim 1, characterized in that, The storage unit of the logging instrument includes a main storage subunit and a backup storage subunit; the logging data collected by the logging instrument is stored in both the main storage subunit and the backup storage subunit.

4. The logging device according to claim 3, characterized in that, The logging instrument further includes a logging unit, a power supply unit, and a communication unit; the logging unit is used to collect the logging data; the power supply unit is used to supply power to the communication unit, the storage unit, and the logging unit; the communication unit is used to realize the communication connection between the logging instrument and the telemetry communication sub.

5. The logging device according to claim 4, characterized in that, The power supply unit includes a main power supply subunit and a backup power supply subunit; the main power supply subunit is used to supply power to the communication unit, the storage unit, and the logging unit; The backup power subunit is used to provide auxiliary power to the communication unit, the storage unit, and the logging unit when the main power subunit is low on power.

6. The logging device according to claim 1, characterized in that, The logging instrument also includes a storage configuration file, which is used to initialize the storage unit in the logging instrument on the ground, and to read the logging data in the storage unit after the logging instrument has completed data acquisition.

7. The logging device according to claim 1, characterized in that, The telemetry communication module includes a storage module, a power module, and a communication module. The communication module is used to receive the cable logging communication activation command sent by the ground system and send the cable logging communication activation command to the logging instruments. It is also used to receive logging data transmitted by all logging instruments in parallel, store the logging data in the storage module, and simultaneously transmit the logging data to the ground system through the communication cable in the preset transmission format. The power module is used to supply power to the storage module and the communication module.

8. The logging device according to claim 1, characterized in that, The connector structure includes an upper connector and a lower connector; the telemetry communication sub is connected to the upper connector of the target logging instrument via the lower connector, wherein the target logging instrument is the logging instrument directly connected to the telemetry communication sub; the lower connector of the target logging instrument is used to connect to the upper connector of another logging instrument.

9. A data acquisition method for a well logging device, characterized in that, The data acquisition method is applied to the logging apparatus according to any one of claims 1-8. The data acquisition method includes: the surface system sending an activation cable logging communication command to a telemetry communication sub-section via a communication cable; the telemetry communication sub-section transmitting the activation cable logging communication command to the logging instrument; the logging instrument acquiring logging data and storing the logging data in its own storage unit in storage mode, and simultaneously transmitting the logging data to the telemetry communication sub-section based on the activation cable logging communication command in cable logging mode, wherein the logging instrument uses a preset matching algorithm to match the storage mode and the cable logging mode. The acquisition time of the well logging operation mode is matched; wherein, the preset matching algorithm is a time-depth matching algorithm. When the logging instrument is operating simultaneously in the storage operation mode and the cable logging operation mode, the time-depth of the storage operation mode is used as the standard. Before the logging data is uploaded to the surface system through the telemetry communication sub, a time-depth correction is performed to update it to the time-depth data of the cable logging operation mode. The telemetry communication sub receives and stores the logging data, and simultaneously transmits the logging data to the surface system through the communication cable in a preset transmission format, wherein the preset transmission format is a square wave or other format with a power lower than a set value.

10. A well logging system, characterized in that, The logging system includes the logging device described in any one of claims 1-8.

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