A multi-point high-speed telemetry transmission system and method for single-core cables

Abstract

The present invention belongs to the field of testing technology, and in particular, relates to a multi-point high-speed telemetry transmission system and method for a single-core cable. A multi-point high-speed telemetry transmission system for a single-core cable includes a plurality of downhole measurement pup sections, a single-core cable, and a ground system. The downhole measurement pup sections are connected in series to the well-entry end of the single-core cable, and the ground system is connected to the well-exit end of the single-core cable. The ground system sends commands from the ground to the downhole. After the downhole measurement pup section receives and identifies the ground system command, it starts to transmit data to the ground system through the single-core cable, and processes and displays the data. The present invention adjusts different parameters for different downhole measurement pup sections by setting a parameter switching module, cooperating with a controllable gain amplifier and an adjustable equalizer, so as to realize real-time, uninterrupted, high-speed transmission of data detected by multiple downhole measurement pup sections using a single-core cable.

Description

Technical Field

[0001] The invention belongs to the field of testing technology, and in particular relates to a multi-point high-speed telemetry transmission system and method for a single-core cable. Background Art

[0002] For the production of oil and gas wells in a specific oil and gas field, it is usually necessary to test various technical solutions for increasing the production of oil and gas wells to find out the most suitable oil and gas production plan for the oil field under various specific conditions. Because it is neither practical nor economical to conduct experiments through existing production wells, in order to achieve the purpose of verifying the technical plan in advance, a test well is usually used to simulate the conditions of the fluid in the well under various conditions to guide the actual production plan. In actual operation, various types of sensors need to be placed at different depths of the test well to obtain various reliable production data, and this real-time, uninterrupted, high-speed and reliable data transmission has become the key to the entire experimental system.

[0003] The traditional downhole monitoring method for oil and gas field production wells is to perform single-point transmission in the well. The signal transmission distance is fixed. For the single-core cable for transmission, the data signal of the downhole instrument can be obtained by adopting the balanced compensation scheme at the receiving end. For the experimental wells of oil and gas production schemes, the downhole instruments are distributed on cables of varying distances. Due to the requirements of experimental research data accuracy, high-speed data transmission is also required. Therefore, the traditional downhole monitoring of production wells uses a unified balanced compensation module for unified compensation. The method cannot meet the monitoring requirements. To solve this problem, the existing solution adopts the method of adding a balanced compensation module to each measuring short section. Although it is effective, the circuit design of this method is too complicated and there is a limit on the number of downhole instruments that can be used. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a multi-point high-speed telemetry transmission system and method for a single-core cable. By setting a parameter switching module, cooperating with a controllable gain amplifier and an adjustable equalizer, different parameters are adjusted for different downhole measurement pup sections, so as to realize real-time, uninterrupted and high-speed transmission of data detected by multiple downhole measurement pup sections using a single-core cable.

[0005] The technical solution of the present invention is: a multi-point high-speed telemetry transmission system for a single-core cable includes multiple downhole measurement short sections, a single-core cable, and a ground system. The downhole measurement short sections are connected in series to the well-entry end of the single-core cable, and the ground system is connected to the well-exit end of the single-core cable. The ground system sends commands from the ground to the downhole. After the downhole measurement short sections receive and identify the ground system commands, they start to transmit data to the ground system through the single-core cable, and process and display them.

[0006] The downhole measuring pup joint is provided with a sensor and a downhole measuring pup joint circuit. The downhole measuring pup joint circuit includes a control center module, a data acquisition module, a data storage module, a data sending module, a command receiving module, an isolation module, and a power supply module. One end of the command receiving module is connected to the control center module, and the other end is connected to a single-core cable. The sensor is connected in series with the data acquisition module, the data storage module, the data sending module, and the single-core cable in sequence. The control center module is connected to the data acquisition module, the data storage module, and the data sending module respectively. The power supply module is connected in series with the isolation module and the single-core cable in sequence.

[0007] The ground system is provided with a ground circuit, which includes a synchronous generation module, a parameter switching module, a controllable gain amplifier, an adjustable equalizer, an amplitude detection module, a status indication module, a data decoding module, and a data display module. The output end of the synchronous generation module is respectively connected to the parameter switching module, the amplitude detection module, and the single-core cable. The output end of the parameter switching module is connected to the adjustable equalizer. The output end of the amplitude detection module is connected to the controllable gain amplifier. The single-core cable is connected in series with the controllable gain amplifier, the adjustable equalizer, the data decoding module, and the data display module.

[0008] The surface system sends a command from the ground to the well every 5 seconds.

[0009] The downhole measurement sub starts uploading data 200ms after receiving and identifying the ground system command.

[0010] For any two adjacent downhole measurement subs among the plurality of downhole measurement subs, a time interval between one downhole measurement sub suspending data uploading and another downhole measurement sub starting data uploading is greater than 50 ms.

[0011] The time interval between any two adjacent downhole measurement short sections in the plurality of downhole measurement short sections for uploading data is 400 ms.

[0012] The transmission rate of the single-core cable is 100K / s.

[0013] A multi-point high-speed telemetry transmission method for a single-core cable, using any of the multi-point high-speed telemetry transmission systems for a single-core cable as described above, comprises the following steps:

[0014] S1: Driven by the synchronization generation module, the surface system sends a synchronization signal command to the single-core cable every 5 seconds. The synchronization signal command is transmitted to the downhole measurement sub through the single-core cable.

[0015] S2: One end of the command receiving module of the downhole measurement short section is connected to the cable, the command receiving module receives the synchronization signal command sent by the ground system transmitted from the single-core cable, and transmits the synchronization signal command to the control center module, and the control center module controls the data acquisition module to collect the data detected by the sensor, controls the data storage module to store the data collected by the data acquisition module, and controls the data sending module to prepare to upload data at the specified time according to the synchronization signal command.

[0016] S3: After the downhole measurement sub control center module is triggered, the data sending module reads the data in the data storage module, and sends the data directly to the single-core cable after modulation according to the preset timing; at the same time, the DC power supply on the single-core cable is eliminated through the isolation module to prevent the DC power supply from interfering with the data signal of the single-core cable, thereby ensuring the signal transmission of the single-core cable;

[0017] S4: The downhole measurement short section data is uploaded to the ground through a single-core cable. The synchronous generation module of the ground system controls the amplitude detection module to detect the amplitude of the data according to the agreed time sequence, and adjusts the gain of the data signal through the controllable gain amplifier. At the same time, the synchronous generation module controls the parameter switching module to determine the adjustment parameters of different downhole measurement short sections according to the agreed time sequence, and controls the adjustable equalizer to adjust the recovery signal waveform to complete the signal reception recovery. During the whole process, the status indication module displays the status of different downhole measurement short sections in real time;

[0018] S5: The signal recovered in S4 is finally demodulated by the data decoding module and sent to the data display module via USB for display and storage.

[0019] The technical effect of the present invention is that the present invention adjusts different parameters for different downhole measurement short sections by setting a parameter switching module, cooperating with a controllable gain amplifier and an adjustable equalizer, and realizing real-time, uninterrupted, high-speed transmission of data detected by multiple downhole measurement short sections with a single-core cable.

[0020] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of a multi-point high-speed telemetry transmission system for a single-core cable.

[0022] Figure 2 The present invention is a schematic diagram of a downhole measurement short section circuit of a multi-point high-speed telemetry transmission system for a single-core cable.

[0023] Figure 3 The present invention is a ground circuit diagram of a multi-point high-speed telemetry transmission system for a single-core cable.

[0024] Figure 4 The present invention is a schematic diagram of a single-core cable transmission signal waveform timing sequence of a multi-point high-speed telemetry transmission system for a single-core cable. DETAILED DESCRIPTION

[0025] Example 1

[0026] In order to overcome the problem that the existing method of using a unified compensation module for underground monitoring of production wells cannot meet the requirements of monitoring multiple measuring short sections, and the method of adding a balanced compensation module to each measuring short section has a complex circuit, the present invention provides a method of using a unified compensation module for underground monitoring of production wells, Figure 1 A multi-point high-speed telemetry transmission system and method for a single-core cable is shown. The present invention sets a parameter switching module, cooperates with a controllable gain amplifier and an adjustable equalizer, adjusts different parameters for different downhole measurement short sections, and realizes real-time, uninterrupted, high-speed transmission of data detected by multiple downhole measurement short sections using a single-core cable.

[0027] like Figure 1 As shown, a multi-point high-speed telemetry transmission system for a single-core cable includes a plurality of downhole measuring short sections, a single-core cable, and a ground system. The downhole measuring short sections are connected in series to the well-entry end of the single-core cable, and the ground system is connected to the well-exit end of the single-core cable. The ground system sends commands from the ground to the downhole. After the downhole measuring short sections receive and identify the ground system commands, they start to transmit data to the ground system through the single-core cable, and process and display them.

[0028] The ground system of the present invention sends commands from the ground to the underground. After the underground measuring short section receives and identifies the ground system command, it starts to transmit data to the ground system through the single-core cable, and processes and displays the data, thereby realizing real-time, uninterrupted and high-speed transmission of data detected by multiple underground measuring short sections through the single-core cable.

[0029] Example 2

[0030] like Figure 2 As shown, preferably, on the basis of Example 1, in this embodiment, the downhole measuring pup joint is provided with a sensor and a downhole measuring pup joint circuit, and the downhole measuring pup joint circuit includes a control center module, a data acquisition module, a data storage module, a data sending module, a command receiving module, an isolation module, and a power supply module. One end of the command receiving module is connected to the control center module, and the other end is connected to the single-core cable. The sensor is connected in series with the data acquisition module, the data storage module, the data sending module, and the single-core cable in sequence. The control center module is respectively connected to the data acquisition module, the data storage module, and the data sending module, and the power supply module is connected in series with the isolation module and the single-core cable in sequence.

[0031] In actual use, the command receiving module receives the command sent from the ground system transmitted by the single-core cable, and transmits the command to the control center module. The control center module controls the data acquisition module to collect data detected by the sensor, controls the data storage module to store the data collected by the data acquisition module, and controls the data sending module to send data to the ground system via the single-core cable according to the received command. The power supply module and the isolation module eliminate the DC power supply on the single-core cable through the isolation module, prevent the DC power supply from interfering with the data signal of the single-core cable, and ensure the signal transmission of the single-core cable.

[0032] like Figure 3 As shown, preferably, the ground system is provided with a ground circuit, and the ground circuit includes a synchronous generation module, a parameter switching module, a controllable gain amplifier, an adjustable equalizer, an amplitude detection module, a status indication module, a data decoding module, and a data display module. The output end of the synchronous generation module is respectively connected to the parameter switching module, the amplitude detection module, and the single-core cable, the output end of the parameter switching module is connected to the adjustable equalizer, the output end of the amplitude detection module is connected to the controllable gain amplifier, and the single-core cable is connected in series with the controllable gain amplifier, the adjustable equalizer, the data decoding module, and the data display module.

[0033] In actual use, the core of the ground system receiving is a controllable gain amplifier and an adjustable equalizer. The controllable gain amplifier amplifies the received signal to a suitable amplitude for easy reception. The adjustable equalizer compensates for the characteristics of the single-core cable and restores the received signal so that it can be correctly decoded. The synchronization generation module generates a time synchronization signal for the ground downhole. After triggering, the downhole sends data according to the agreed time sequence, the ground receives the signal according to the agreed time sequence, the ground program adjusts the parameters of the adjustable equalizer according to the agreed time sequence to restore the signal waveform, and the amplitude detection module detects the amplitude and adjusts the gain according to the agreed time sequence. In addition, since the parameters need to be stabilized after adjustment, sufficient time gaps are inserted between each channel. Since there are many channels to receive, it is troublesome to obtain the pre-adjusted parameters. The parameter switching module is added with a status indication module to conveniently display the data parameters of the downhole measurement short section being adjusted and the state of the adjustment parameters, which facilitates the entire adjustment process. After the data transmitted by the single-core cable is adjusted by the controllable gain amplifier and the adjustable equalizer, it is transmitted to the data decoding module for decoding, and the decoded data is transmitted to the data display module for processing and display.

[0034] like Figure 4As shown, preferably, the ground system sends a command from the ground to the downhole once every 5 seconds. The downhole measurement short section starts uploading data 200ms after receiving and identifying the ground system command. The time interval between any two adjacent downhole measurement short sections among the multiple downhole measurement short sections stopping uploading data and another downhole measurement short section starting uploading data is greater than 50ms. The time interval between any two adjacent downhole measurement short sections among the multiple downhole measurement short sections uploading data is 400ms. The transmission rate of the single-core cable is 100K / s.

[0035] In actual use, the downhole measurement short section starts uploading data 200ms after receiving and identifying the ground system command. For any two adjacent downhole measurement short sections among the multiple downhole measurement short sections, the time interval between one downhole measurement short section stopping uploading data and another downhole measurement short section starting uploading data is greater than 50ms. The time interval between any two adjacent downhole measurement short sections among the multiple downhole measurement short sections uploading data is 400ms, which ensures that different downhole measurement short sections transmit detection data in an orderly, normal and fast manner, and that there is no confusion or garbled code in the data transmission process. The transmission rate of a single-core cable can reach 100K / s. High-speed transmission of downhole measurement short section data on a single-core cable is achieved.

[0036] Example 3

[0037] A multi-point high-speed telemetry transmission method for a single-core cable, using any of the multi-point high-speed telemetry transmission systems for a single-core cable as described above, comprises the following steps:

[0038] S1: Driven by the synchronization generation module, the surface system sends a synchronization signal command to the single-core cable every 5 seconds. The synchronization signal command is transmitted to the downhole measurement sub through the single-core cable.

[0039] S2: One end of the command receiving module of the downhole measurement short section is connected to the cable, the command receiving module receives the synchronization signal command sent by the ground system transmitted from the single-core cable, and transmits the synchronization signal command to the control center module, and the control center module controls the data acquisition module to collect the data detected by the sensor, controls the data storage module to store the data collected by the data acquisition module, and controls the data sending module to prepare to upload data at the specified time according to the synchronization signal command.

[0040] S3: After the downhole measurement sub control center module is triggered, the data sending module reads the data in the data storage module, and sends the data directly to the single-core cable after modulation according to the preset timing; at the same time, the DC power supply on the single-core cable is eliminated through the isolation module to prevent the DC power supply from interfering with the data signal of the single-core cable, thereby ensuring the signal transmission of the single-core cable;

[0041] S4: The downhole measurement short section data is uploaded to the ground through a single-core cable. The synchronous generation module of the ground system controls the amplitude detection module to detect the amplitude of the data according to the agreed time sequence, and adjusts the gain of the data signal through the controllable gain amplifier. At the same time, the synchronous generation module controls the parameter switching module to determine the adjustment parameters of different downhole measurement short sections according to the agreed time sequence, and controls the adjustable equalizer to adjust the recovery signal waveform to complete the signal reception recovery. During the whole process, the status indication module displays the status of different downhole measurement short sections in real time;

[0042] S5: The signal recovered in S4 is finally demodulated by the data decoding module and sent to the data display module via USB for display and storage.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi-point high-speed telemetry transmission method for a single-core cable, characterized in that: A multi-point high-speed telemetry transmission system for a single-core cable is used, the system includes a plurality of downhole measuring short sections, a single-core cable, and a ground system, the plurality of downhole measuring short sections are connected in series at the well-entry end of the single-core cable, the ground system is connected to the well-exit end of the single-core cable, the ground system sends commands from the ground to the downhole, after the downhole measuring short section receives and identifies the ground system command, it starts to transmit data to the ground system through the single-core cable, and processes and displays the data, the downhole measuring short section is provided with a sensor and a downhole measuring short section circuit, the downhole measuring short section circuit includes a control center module, a data acquisition module, a data storage module, a data sending module, a command receiving module, an isolation module, and a power supply module, the control center module is respectively connected to the data acquisition module, the data storage module, and the data sending module, the power supply module is connected to the isolation module and the single-core cable The ground system is connected in series in sequence. The ground circuit includes a synchronous generation module, a parameter switching module, a controllable gain amplifier, an adjustable equalizer, an amplitude detection module, a status indication module, a data decoding module, and a data display module. The output end of the synchronous generation module is respectively connected with the parameter switching module, the amplitude detection module, and the single-core cable. The output end of the parameter switching module is connected with the adjustable equalizer. One end of the amplitude detection module receiving module is connected with the control center module and the other end is connected with the single-core cable. The sensor is connected in series with the data acquisition module, the data storage module, the data sending module, and the single-core cable in sequence. The block output end is connected with the controllable gain amplifier. The single-core cable is connected in series with the controllable gain amplifier, the adjustable equalizer, the data decoding module, and the data display module in sequence. The multi-point high-speed telemetry transmission method includes the following steps: S1: Driven by the synchronization generation module, the surface system sends a synchronization signal command to the single-core cable every 5 seconds. The synchronization signal command is transmitted to the downhole measurement sub through the single-core cable. S2: One end of the command receiving module of the downhole measurement short section is connected to the cable, the command receiving module receives the synchronization signal command sent by the ground system transmitted from the single-core cable, and transmits the synchronization signal command to the control center module, and the control center module controls the data acquisition module to collect the data detected by the sensor, controls the data storage module to store the data collected by the data acquisition module, and controls the data sending module to prepare to upload data at the specified time according to the synchronization signal command. S3: After the downhole measurement sub control center module is triggered, the data sending module reads the data in the data storage module, and sends the data directly to the single-core cable after modulation according to the preset timing; at the same time, the DC power supply on the single-core cable is eliminated through the isolation module to prevent the DC power supply from interfering with the data signal of the single-core cable, thereby ensuring the signal transmission of the single-core cable; S4: The downhole measurement short section data is uploaded to the ground through a single-core cable. The synchronous generation module of the ground system controls the amplitude detection module to detect the amplitude of the data according to the agreed time sequence, and adjusts the gain of the data signal through the controllable gain amplifier. At the same time, the synchronous generation module controls the parameter switching module to determine the adjustment parameters of different downhole measurement short sections according to the agreed time sequence, and controls the adjustable equalizer to adjust the recovery signal waveform to complete the signal reception recovery. During the whole process, the status indication module displays the status of different downhole measurement short sections in real time; S5: The signal recovered in S4 is finally demodulated by the data decoding module and sent to the data display module via USB for display and storage.

2. A multi-point high-speed telemetry transmission method for a single-core cable according to claim 1, characterized in that: The surface system sends a command from the ground to the well every 5 seconds.

3. A multi-point high-speed telemetry transmission method for a single-core cable according to claim 1, characterized in that: The downhole measurement sub starts uploading data 200ms after receiving and identifying the ground system command.

4. A multi-point high-speed telemetry transmission method for a single-core cable according to claim 1, characterized in that: For any two adjacent downhole measurement subs among the plurality of downhole measurement subs, a time interval between one downhole measurement sub suspending data uploading and another downhole measurement sub starting data uploading is greater than 50 ms.

5. A multi-point high-speed telemetry transmission method for a single-core cable according to claim 1, characterized in that: The time interval between any two adjacent downhole measurement short sections in the plurality of downhole measurement short sections for uploading data is 400 ms.

6. A multi-point high-speed telemetry transmission method for a single-core cable according to claim 1, characterized in that: The transmission rate K of the single-core cable is 100 / s.

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