Permanent downhole passive measurement and control device and system

Abstract

The application provides a kind of permanent downhole passive measurement and control device and system, the device includes circuit cylinder, overflow passage and outer cylinder, power module, motor module, main control module and communication module are installed in the circuit cylinder, the outer side of the overflow passage, winding two mutually isolated coils, wireless power supply coil and wireless communication coil respectively, the wireless power supply coil is connected with the power module, and the circuit part of the permanent downhole passive measurement and control device is powered;The wireless communication coil is connected with the communication module, realizes the two-way communication between the permanent downhole passive measurement and control device and downhole measurement and control instrument;The main control module is connected with the communication module to realize two-way communication;The main control module is connected with the motor module, realizes the control and monitoring of the motor module.The permanent downhole passive measurement and control device and system are suitable for the production process of discontinuous pipe column, expand the application scope of intelligent measurement and control technology, have very high field application value.

Description

Technical Field

[0001] This invention relates to the field of oilfield development equipment technology, and in particular to a permanent downhole passive monitoring and control device and system. Background Technology

[0002] To meet the demands of efficient oilfield development and smart oilfield construction, intelligent monitoring and control technology is widely used in downhole equipment. Cable-based intelligent monitoring and control technology, due to its high reliability and large communication data capacity, is currently widely used in real-time monitoring and control of production wells in domestic oilfields. However, cable-based intelligent monitoring and control technology has unavoidable drawbacks in real-time monitoring and control of production wells: firstly, the cable being tied to the outside of the tubing increases construction complexity and cost; secondly, cable-based intelligent monitoring and control technology requires the production tubing string to be continuous, making it unsuitable for segmented tubing strings. To overcome these shortcomings, engineers have applied wireless power supply and communication technology to real-time downhole monitoring and control of production wells, solving both the power supply and data communication needs for the normal operation of downhole intelligent equipment.

[0003] Patent CN109347213A relates to a non-contact charging method for intelligent water distributors in oilfields. The specific implementation steps are as follows: This method utilizes the principle of wireless power transmission and includes a charging system comprising: a ground-based power supply, an energy conversion module, a power transmitter, a power receiver and rectifier, a charging control circuit, and a rechargeable battery plus a supercapacitor. This invention not only solves the problem of significantly increased costs due to the presence of cables in cable-based intelligent water distribution and injection processes, but also overcomes the disadvantage of insufficient battery power in cableless processes. Furthermore, it is simpler, easier to operate, and saves time and effort compared to existing mechanical transmission valve control methods. The introduction of supercapacitors also enables this technology to be used for rapid charging in short periods. This invention has a reasonable design, simple structure, convenient operation, and stable and reliable performance. Applying this method can greatly improve work efficiency, with very significant application effects and a very broad prospect for application in oilfields.

[0004] CN110994808B relates to an electromagnetic induction coupling charging device and method for use in oilfield downhole environments. The electromagnetic induction coupling charging device for oilfield downhole environments includes a surface main unit, a retrieval device, and a downhole device. The surface main unit and the retrieval device are connected by a cable. A primary-side energy transmitting coil is installed at the lower end of the retrieval device. The retrieval device includes a DC-DC step-down module, a control module, a voltage and current phase detection module, a drive circuit, a high-frequency inverter circuit, a primary-side compensation circuit, a wireless communication module (retrieval device end), and a power line carrier communication module (retrieval device end). The downhole device includes a secondary-side energy pickup coil, a secondary-side compensation circuit, and a battery pack. During battery charging, as the retrieval device is lowered, the primary-side energy transmitting coil is coaxially inserted into the secondary-side energy pickup coil for charging. After charging is complete, the primary-side energy transmitting coil is pulled out of the well. This invention uses electromagnetic induction coupling power supply technology to charge batteries downhole, which is simple and requires less work.

[0005] Patent CN107707277B discloses an oil well communication system based on a broadband power line carrier communication module, a medium-voltage rectifier power supply module, and a rechargeable battery pack. This system is used in the remote control system of drilling motors operating on an 1140V power line in oilfields. By modifying the existing power line carrier analog front-end circuit, coupling circuit, and back-end PA power amplifier circuit, the system increases the carrier frequency of the power line carrier communication, thereby improving the carrier communication rate and stability while reducing latency. Furthermore, by improving the power supply method to the wellbore power transmission module, high-order harmonic noise interference from the high-frequency power supply is avoided, significantly improving the real-time performance and stability of the carrier communication. Based on this system design, the power line carrier communication performance of oil drilling platform systems is greatly improved.

[0006] Patent CN113937904B discloses a multi-channel wireless power transmission coupling mechanism based on downhole rotary steering, relating to the technical field of power transmission devices for downhole rotary steering in oil drilling. The invention includes a transmitter and a receiver. The transmitter includes an inner magnetic core, a primary energy transmitting coil I, and a primary energy transmitting coil II; the receiver includes an outer magnetic core, a secondary energy receiving coil I, and a secondary energy receiving coil II. This invention employs two sets of power transmission channels, capable of outputting 48V and 12V voltages respectively to power the hydraulic press and sensors. The two power transmission channels utilize two sets of coils, which can be stacked together in a DD-Q coil combination to achieve isolation between the two power transmission channels, significantly reducing the size of the power transmission system, minimizing safety hazards, and making it suitable for high-temperature downhole environments.

[0007] The aforementioned comparative patents disclose a non-contact charging method, an electromagnetic induction coupling charging device and method, and a multi-channel wireless power transmission coupling mechanism for downhole intelligent water distributors. They mainly introduce the wireless power supply circuit topology and system framework, which differ from the mechanical and circuit structures used in this invention. All of the above-mentioned prior art differs significantly from this invention and fails to solve the technical problem we aim to address. Therefore, we have invented a new permanent downhole passive monitoring and control device and system. Summary of the Invention

[0008] The purpose of this invention is to provide a permanent downhole passive monitoring and control device and system that can be placed downhole for a long time and whose working life is not affected by battery power.

[0009] The objective of this invention can be achieved through the following technical measures: a permanent downhole passive monitoring and control device, comprising a circuit cylinder, a current-carrying channel, and an outer cylinder. Both the circuit cylinder and the current-carrying channel are located within the outer cylinder. A power module, a motor module, a main control module, and a communication module are installed within the circuit cylinder. Two isolated coils are wound around the outside of the current-carrying channel; these are a wireless power supply coil and a wireless communication coil. The wireless power supply coil is connected to the power module to supply power to the circuitry of the permanent downhole passive monitoring and control device. The wireless communication coil is connected to the communication module to enable bidirectional communication between the permanent downhole passive monitoring and control device and the downhole monitoring and control instrument. The power module is connected to and supplies power to the motor module, the main control module, and the communication module. The main control module is connected to the communication module to enable bidirectional communication. The main control module is connected to the motor module to control and monitor the motor module.

[0010] The objective of this invention can also be achieved through the following technical measures:

[0011] The permanent downhole passive monitoring and control device also includes a first channel and a second channel. The first channel is a cylindrical structure that connects the flow channel and the circuit cylinder. The second channel is a cylindrical structure that connects the circuit cylinder and the outer cylinder.

[0012] The first channel and the second channel are respectively connected to the corresponding positions of the motor module in the circuit tube, and the motor module controls the on / off state and opening degree of the first channel and the second channel.

[0013] The upper and lower ends of the flow channel are connected to the production tubing, and the well fluid flows in the flow channel.

[0014] The objective of this invention can also be achieved through the following technical measures: a permanent downhole passive monitoring and control system, comprising a surface control cabinet, a downhole monitoring and control instrument, and a permanent downhole passive monitoring and control device. The surface control cabinet and the downhole monitoring and control instrument are connected by a cable to provide power to the downhole monitoring and control instrument and to enable bidirectional communication between the surface control cabinet and the downhole monitoring and control instrument. The downhole monitoring and control instrument and the permanent downhole passive monitoring and control device communicate wirelessly via electromagnetic waves, and the downhole monitoring and control instrument provides power to the permanent downhole passive monitoring and control device via electromagnetic waves.

[0015] The objective of this invention can also be achieved through the following technical measures:

[0016] The permanent downhole passive monitoring and control system adopts a tubing structure and also includes a suspended packer, which bears the weight of the entire tubing string.

[0017] The permanent downhole passive monitoring and control system employs multiple permanent downhole passive monitoring and control devices, and uses multiple layered packers to isolate the multiple permanent downhole passive monitoring and control devices in different production layers.

[0018] The suspended packer, the permanent downhole passive monitoring and control device, and the layered packer are connected from top to bottom via tubing, with the bottom of the tubing in a blocked state.

[0019] The permanent downhole passive monitoring and control device opens, closes, or adjusts the opening degree of the liquid communication channel between the production layer and the production tubing.

[0020] The permanent downhole passive monitoring and control device includes a circuit cylinder, a current-carrying channel, and an outer cylinder. Both the circuit cylinder and the current-carrying channel are located inside the outer cylinder. The circuit cylinder houses a power module, a motor module, a main control module, and a communication module. Two isolated coils are wound around the outside of the current-carrying channel; one is a wireless power supply coil, and the other is a wireless communication coil. The wireless power supply coil is connected to the power module to supply power to the circuitry of the permanent downhole passive monitoring and control device. The wireless communication coil is connected to the communication module to enable bidirectional communication between the permanent downhole passive monitoring and control device and the downhole monitoring and control instrument. The power module supplies power to the motor module, the main control module, and the communication module. The main control module is connected to the communication module to enable bidirectional communication. The main control module is connected to the motor module to control and monitor the motor module.

[0021] The permanent downhole passive monitoring and control device also includes a first channel and a second channel. The first channel is a cylindrical structure that connects the flow channel and the circuit cylinder. The second channel is a cylindrical structure that connects the circuit cylinder and the outer cylinder.

[0022] The first channel and the second channel are respectively connected to the corresponding positions of the motor module in the circuit tube, and the motor module controls the on / off state and opening degree of the first channel and the second channel.

[0023] The upper and lower ends of the flow channel are connected to the production tubing, and the well fluid flows in the flow channel.

[0024] The downhole monitoring and control instrument includes a second wireless power supply coil, a second wireless communication coil, a second power supply module, a wireless communication module, a sensor module, a second main control module, a second power supply module, and a wired communication module. One end of the cable connects to the second power supply module and the wired communication module, and the other end connects to the ground control cabinet. The second power supply module is connected to the second main control module, the sensor module, the wireless communication module, and the second power supply module, and provides them with power. The second main control module is connected to the wired communication module and the wireless communication module, and enables bidirectional communication. The wireless communication module is connected to the second wireless communication coil and transmits wireless communication signals to the external space through the second wireless communication coil. The second power supply module is connected to the second wireless power supply coil and transmits power to the external space through the second wireless power supply coil. The sensor module is connected to the second main control module, transmits the collected sensor signals to the second main control module, and the second main control module sends them to the wired communication module, thereby transmitting them to the ground control cabinet.

[0025] The motor module transmits the monitored motor status signal to the main control module. Then, the motor status signal is transmitted to the ground control cabinet through the communication module, the wireless communication coil, the second wireless communication coil, the wireless communication module, the second main control module, and the wired communication module.

[0026] The permanent downhole passive monitoring and control device and system of this invention uses wireless electromagnetic coupling for power supply and communication. The downhole intelligent monitoring and control device is permanently stationary in the well without a battery, and is powered and communicated via a wireless transmitter. Compared to battery-powered downhole intelligent monitoring and control devices, this permanent downhole passive monitoring and control device can be placed downhole for extended periods, its working life unaffected by battery power. When monitoring and control are required, a downhole monitoring and control instrument is lowered in to wirelessly power and activate it, enabling bidirectional communication to read motor opening and control motor operation. This on-demand power supply avoids the problem of charging being impossible when downhole temperatures exceed 85°C. Compared to cabled intelligent monitoring and control technology, this permanent downhole passive monitoring and control system eliminates the need for cables and cable couplings tied to the outside of the tubing, simplifying the construction process, saving costs, and being suitable for production processes with discontinuous tubing strings, thus expanding the application scope of intelligent monitoring and control technology. This technology has extremely high field application value. Attached Figure Description

[0027] Figure 1 This is a diagram of the tubing structure of a permanent downhole passive monitoring and control system in a specific embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a permanent downhole passive monitoring and control device in a specific embodiment of the present invention;

[0029] Figure 3 In a specific embodiment of the present invention Figure 2 AA section diagram;

[0030] Figure 4 This is a schematic diagram of a downhole monitoring and control instrument in a specific embodiment of the present invention;

[0031] The diagram includes: control cabinet 1, cable 2, downhole monitoring and control instrument 3, suspended packer 4, layered packer 5, permanent downhole passive monitoring and control device 6, permanent downhole passive monitoring and control device 7, tubing 8, casing 9, annular space d1, and annular space d2.

[0032] Power module a1, motor module a2, main control module a3, communication module a4, wireless power supply coil a5, wireless communication coil a6;

[0033] Circuit cylinder b1, current passage b2, first channel b3, second channel b4, outer cylinder b5;

[0034] Second wireless power supply coil c1, second wireless communication coil c2, second power supply module c3, wireless communication module c4, sensor module c5, second main control module c6, power supply module c7, and wired communication module c8. Detailed Implementation

[0035] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0037] A permanent downhole passive monitoring and control system comprises three parts: a surface control cabinet, a downhole monitoring and control instrument, and a permanent downhole passive monitoring and control device. The surface control cabinet and the downhole monitoring and control instrument are connected by a cable to power the instrument and enable bidirectional communication between them. The downhole monitoring and control instrument and the permanent downhole passive monitoring and control device communicate wirelessly via electromagnetic waves, and the downhole monitoring and control instrument powers the device via electromagnetic waves.

[0038] The permanent downhole passive monitoring and control device, such as Figure 2 and Figure 3 As shown. Connected to the production tubing via oil pipes, it mainly consists of mechanical and electrical components.

[0039] The circuit section includes: a power supply module a1, a motor module a2, a main control module a3, a communication module a4, a wireless power supply coil a5, and a wireless communication coil a6. The wireless power supply coil a5 is connected to the power supply module a1 via a wire, supplying power to the circuit section of the permanent downhole passive monitoring and control device. The wireless communication coil a6 is connected to the communication module a4 via a wire, enabling bidirectional communication between the permanent downhole passive monitoring and control device and the downhole monitoring and control instrument. The power supply module a1 is connected to the motor module a2, main control module a3, and communication module a6 via wires, providing power. The main control module a3 is connected to the communication module a4 via a wire, enabling bidirectional communication. The main control module a3 is also connected to the motor module a2 via a wire, enabling control and monitoring of the motor module a2.

[0040] The mechanical components include: a circuit cylinder b1, a flow channel b2, a first channel b3, a second channel b4, and an outer cylinder b5. The circuit cylinder b1 houses a power module a1, a motor module a2, a main control module a3, and a communication module a4. The flow channel b2 is connected to the production tubing at both ends, allowing well fluid to flow within it. Two isolated coils, a wireless power supply coil a5 and a wireless communication coil a6, are wound around the outside of the flow channel b2. The first channel b3 is a cylindrical structure connecting the flow channel b2 and the circuit cylinder b1. The second channel b4 is also a cylindrical structure connecting the circuit cylinder b1 and the outer cylinder b5. The first channel b3 and the second channel b4 are connected to the corresponding positions of the motor module a2 within the circuit cylinder b1. The motor module a2 controls the on / off state and opening degree of the first channel b3 and the second channel b4.

[0041] The downhole monitoring and control instrument includes: such as Figure 4As shown. The system includes a second wireless power supply coil c1, a second wireless communication coil c2, a second power supply module c3, a wireless communication module c4, a sensor module c5, a second main control module c6, a power supply module c7, a wired communication module c8, and a cable 2. One end of the cable 2 connects to the power supply module c7 and the wired communication module c8; the other end of the cable 2 connects to the ground control cabinet 1. The power supply module c7 is connected to the second main control module c6, the sensor module c5, the wireless communication module c4, and the second power supply module c3 via wires, providing them with power. The second main control module c6 is connected to the wired communication module c8 and the wireless communication module c4, enabling bidirectional communication. The wireless communication module c4 is connected to the second wireless communication coil c2 and transmits wireless communication signals to the external space through the second wireless communication coil c2. The second power supply module c3 is connected to the second wireless power supply coil c1 and transmits power to the external space through the second wireless power supply coil c1.

[0042] A permanent downhole passive monitoring and control system comprises three parts: a surface control cabinet, a downhole monitoring and control instrument, and a permanent downhole passive monitoring and control device. For example... Figure 1 The diagram shows the tubing structure of a permanent downhole passive monitoring and control system. This system includes: a control cabinet 1, a cable 2, a downhole monitoring and control instrument 3, a suspended packer 4, a layered packer 5, a permanent downhole passive monitoring and control device 6, a permanent downhole passive monitoring and control device 7, tubing 8, and casing 9. The control cabinet 1 and the downhole monitoring and control instrument 3 are connected via the cable 2, enabling bidirectional communication and power supply from the control cabinet 1 to the instrument 3. The suspended packer 4, the permanent downhole passive monitoring and control device 6, the layered packer 5, and the permanent downhole passive monitoring and control device 7 are connected from top to bottom via tubing, with the bottom of the tubing sealed. The suspended packer 4 primarily bears the weight of the entire tubing string. The layered packer 5 separates the two production layers, preventing fluid exchange between them. The function of the permanent downhole passive monitoring and control devices 6 and 7 is to open, close or adjust the opening degree of the liquid communication channel between the production layer and the production tubing.

[0043] The working principle of this permanent downhole passive monitoring and control system is introduced in three parts: two-way communication, one-way power supply, and two-way fluid flow.

[0044] The working principle of the two-way communication section is as follows: communication from the wellhead to the well bottom, the ground control cabinet 1 transmits the communication signal to the downhole monitoring and control instrument 3 through the cable 2. The wired communication module c8 in the downhole monitoring and control instrument 3 converts the signal into a signal recognizable by the second main control module c6. After analysis, the second main control module c6 sends the communication signal to the wireless communication module c4, which then sends the communication signal to the second wireless communication coil c2. The signal is then transmitted to the space within the wellbore via electromagnetic waves. In the permanent downhole passive monitoring and control device, the wireless communication coil a6 receives the electromagnetic waves and transmits them to the communication module a4, which in turn transmits them to the main control module a3. After analyzing the commands, the main control module a3 issues corresponding commands to the motor module a2. For communication from downhole to wellhead, the motor monitoring circuit in the motor module a2 transmits the motor status signal to the main control module a3. Then, the communication module a4, wireless communication coil a6, second wireless communication coil c2, wireless communication module c4, second main control module c6, wired communication module c8, cable 2, and control cabinet 1 are connected. The sensor module c5 in the downhole monitoring and control instrument 2 can contain various sensors, including but not limited to temperature, pressure, flow, and water content sensors. Sensor module c5 can transmit the tested sensor signals to the ground control cabinet along the direction of the second main control module c6, the wired communication module c8, cable 2, and control cabinet 1.

[0045] Power supply working principle: Control cabinet 1 transmits electrical energy to power module c7 in downhole monitoring and control instrument 3 via cable 2. After voltage transformation, power module c7 supplies power to the second power supply module c3, wireless communication module c4, sensor module c5, second main control module c6, power module c7, and wired communication module c8. The second power supply module c3 performs high-frequency inversion and resonance compensation on the current and then couples it to the second wireless power supply coil c1, transmitting it to the space in the wellbore. After receiving the wireless power signal, the wireless power supply coil a5 in the permanent downhole passive monitoring and control device transmits it to power module a1. Power module a1, after voltage transformation, supplies power to motor module a2, main control module a3, and communication module a4.

[0046] Fluid flow process: For self-flowing oil wells, the fluid from the lower production layer flows from the formation into the annular space d1 surrounded by casing 9, packer 5, tubing 8, and permanent downhole passive monitoring and control device 7. When the motor module a2 on the permanent downhole passive monitoring and control device 7 moves, the second channel b4 connects with the first channel b3, and the flow channel b2 connects with the annular space d1. The fluid from the upper production layer flows from the formation into the annular space d2 surrounded by suspended packer 4, tubing 8, permanent downhole passive monitoring and control device 6, and casing 9. When the motor module a2 on the permanent downhole passive monitoring and control device 6 moves, the second channel b4 connects with the first channel b3, and the flow channel b2 connects with the annular space d2. Formation fluid flows into the tubing and flows upward out of the wellhead. For water injection wells, the fluid flows in the opposite direction.

[0047] The following are several specific embodiments of the application of this invention:

[0048] Example 1: Two-way wireless communication method for a permanent downhole passive monitoring and control system;

[0049] The downhole monitoring and control instrument 3 is connected to the control cabinet 1 via cable 2 and lowered into the well near the permanent downhole passive monitoring and control device. The surface control cabinet 1 transmits communication signals to the downhole monitoring and control instrument 3 via cable 2. The wired communication module c8 in the downhole monitoring and control instrument 3 converts the signal into a signal recognizable by the second main control module c6. After analysis, the second main control module c6 sends the communication signal to the wireless communication module c4, which in turn sends the signal to the second wireless communication coil c2. Then, the signal is transmitted to the space in the wellbore via electromagnetic waves. In the permanent downhole passive monitoring and control device, the wireless communication coil a6 receives the electromagnetic waves and transmits them to the communication module a4, which then transmits them to the main control module a3. After analyzing the commands, the main control module a3 issues corresponding commands to the motor module a2. For communication from downhole to wellhead, the motor monitoring circuit in the motor module a2 transmits the motor status signal to the main control module a3. Then, the communication module a4, wireless communication coil a6, second wireless communication coil c2, wireless communication module c4, second main control module c6, wired communication module c8, cable 2, and control cabinet 1 are connected. The sensor module c5 in the downhole monitoring and control instrument 2 can contain various sensors, including but not limited to temperature, pressure, flow, and water content sensors. Sensor module c5 can transmit the tested sensor signals to the ground control cabinet along the direction of the second main control module c6, the wired communication module c8, cable 2, and control cabinet 1.

[0050] Example 2: Wireless power supply method for a permanent downhole passive monitoring and control system;

[0051] The downhole monitoring and control instrument 3 is connected to the wellhead control cabinet via cable 2 and lowered into the vicinity of the permanent downhole passive monitoring and control device. The control cabinet 1 transmits electrical energy to the power module c7 in the downhole monitoring and control instrument 3 via cable 2. After voltage transformation, the power module c7 supplies power to the second power supply module c3, the wireless communication module c4, the sensor module c5, the second main control module c6, the power module c7, and the wired communication module c8. The second power supply module c3 performs high-frequency inversion and resonance compensation on the current before coupling it to the second wireless power supply coil c1, transmitting the signal to the space in the wellbore. The wireless power supply coil a5 of the permanent downhole passive monitoring and control device receives the wireless power signal and transmits it to the power module a1. The power module a1, after voltage transformation, supplies power to the motor module a2, the main control module a3, and the communication module a4.

[0052] Example 3: String structure of a permanent downhole passive monitoring and control system;

[0053] The permanent downhole passive monitoring and control system tubing structure includes: a control cabinet 1, a cable 2, a downhole monitoring and control instrument 3, a suspended packer 4, a layered packer 5, a permanent downhole passive monitoring and control device 6, a permanent downhole passive monitoring and control device 7, tubing 8, and casing 9. The control cabinet 1 and the downhole monitoring and control instrument 3 are connected via the cable 2, enabling bidirectional communication and power supply from the control cabinet 1 to the downhole monitoring and control instrument 3. The suspended packer 4, the permanent downhole passive monitoring and control device 6, the layered packer 5, and the permanent downhole passive monitoring and control device 7 are connected from top to bottom via tubing, with the bottom of the tubing sealed. The main function of the suspended packer 4 is to bear the weight of the entire tubing string. The function of the layered packer 5 is to separate the two production layers, preventing fluid exchange between them. The function of the permanent downhole passive monitoring and control devices 6 and 7 is to open, close, or adjust the opening degree of the liquid communication channel between the production layer and the production tubing. For production tubing that is being produced in multiple layers simultaneously, multiple layered packers and permanent downhole passive monitoring and control devices are alternately connected at the lower end of the tubing 8.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0055] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

Claims

1. A permanent downhole passive monitoring and control system, characterized in that, The system includes a surface control cabinet, a downhole monitoring and control instrument, and a permanent downhole passive monitoring and control device. The surface control cabinet and the downhole monitoring and control instrument are connected by a cable to provide power to the downhole monitoring and control instrument and to enable bidirectional communication between them. The downhole monitoring and control instrument and the permanent downhole passive monitoring and control device communicate wirelessly via electromagnetic waves, and the downhole monitoring and control instrument provides power to the permanent downhole passive monitoring and control device via electromagnetic waves. The permanent downhole passive monitoring and control device includes a circuit cylinder, a current-carrying channel, and an outer cylinder. Both the circuit cylinder and the current-carrying channel are located inside the outer cylinder. The circuit cylinder houses a power module, a motor module, a main control module, and a communication module. Two isolated coils are wound around the outside of the current-carrying channel; one is a wireless power supply coil, and the other is a wireless communication coil. The wireless power supply coil is connected to the power module to power the circuitry of the permanent downhole passive monitoring and control device. The wireless communication coil is connected to the communication module to enable bidirectional communication between the permanent downhole passive monitoring and control device and the downhole monitoring and control instrument. The power module is connected to and powers the motor module, the main control module, and the communication module. The main control module is connected to the communication module to enable bidirectional communication. The main control module is connected to the motor module to control and monitor the motor module. The permanent downhole passive monitoring and control device also includes a first channel and a second channel. The first channel is a cylindrical structure that connects the flow channel and the circuit cylinder. The second channel is a cylindrical structure that connects the circuit cylinder and the outer cylinder. The first channel and the second channel are respectively connected to the corresponding positions of the motor module in the circuit tube, and the motor module controls the on / off state and opening degree of the first channel and the second channel; The downhole monitoring and control instrument includes a second wireless power supply coil, a second wireless communication coil, a second power supply module, a wireless communication module, a sensor module, a second main control module, and a wired communication module. The second power supply module is connected to the second wireless power supply coil and transmits electrical energy to the external space through the second wireless power supply coil. The sensor module is connected to the second main control module and transmits the collected sensor signals to the second main control module, which then sends them to the wired communication module, thereby transmitting them to the ground control cabinet. From the wellhead to the downhole, communication is achieved by the surface control cabinet transmitting communication signals to the downhole monitoring and control instrument via cable. The wired communication module in the downhole monitoring and control instrument converts the signals into signals recognizable by the second main control module. After analysis, the second main control module sends the communication signals to the wireless communication module, which then sends them to the second wireless communication coil. The signals are then transmitted into the space inside the wellbore via electromagnetic waves. In the permanent downhole passive monitoring and control device, the wireless communication coil receives the electromagnetic waves and transmits them to the communication module, which then transmits them to the main control module. After analyzing the commands, the main control module issues corresponding commands to the motor module.

2. The permanent downhole passive monitoring and control system according to claim 1, characterized in that, The permanent downhole passive monitoring and control system adopts a tubing structure and also includes a suspended packer, which bears the weight of the entire tubing string.

3. The permanent downhole passive monitoring and control system according to claim 2, characterized in that, The permanent downhole passive monitoring and control system employs multiple permanent downhole passive monitoring and control devices, and uses multiple layered packers to isolate the multiple permanent downhole passive monitoring and control devices in different production layers.

4. The permanent downhole passive monitoring and control system according to claim 3, characterized in that, The suspended packer, the permanent downhole passive monitoring and control device, and the layered packer are connected from top to bottom via tubing, with the bottom of the tubing in a blocked state.

5. The permanent downhole passive monitoring and control system according to claim 3, characterized in that, The permanent downhole passive monitoring and control device opens, closes, or adjusts the opening degree of the liquid communication channel between the production layer and the production tubing.

6. The permanent downhole passive monitoring and control system according to claim 1, characterized in that, The upper and lower ends of the flow channel are connected to the production tubing, and the well fluid flows in the flow channel.

7. The permanent downhole passive monitoring and control system according to claim 1, characterized in that, The downhole monitoring and control instrument also includes a second power module. One end of the cable connects the second power module and the wired communication module, and the other end connects to the surface control cabinet. The second power module is connected to the second main control module, the sensor module, the wireless communication module, and the second power supply module, and provides them with power. The second main control module is connected to the wired communication module and the wireless communication module, and realizes bidirectional communication. The wireless communication module is connected to the second wireless communication coil and transmits wireless communication signals to the external space through the second wireless communication coil.

8. The permanent downhole passive monitoring and control system according to claim 7, characterized in that, The motor module transmits the monitored motor status signal to the main control module. Then, the motor status signal is transmitted to the ground control cabinet through the communication module, the wireless communication coil, the second wireless communication coil, the wireless communication module, the second main control module, and the wired communication module.

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