Permanent underground passive measurement and control device and system

Abstract

The invention provides a permanent underground passive measurement and control device and system, the device comprises a circuit cylinder, an overflowing channel and an outer cylinder, a power supply module, a motor module, a main control module and a communication module are installed in the circuit cylinder, two sections of mutually isolated coils, namely a wireless power supply coil and a wireless communication coil, are wound on the outer side of the overflowing channel, and the wireless power supply coil and the wireless communication coil are connected with the circuit cylinder. The wireless power supply coil is connected with the power supply module and supplies power to the circuit part of the permanent underground passive measurement and control device; the wireless communication coil is connected with the communication module to realize bidirectional communication between the permanent underground passive measurement and control device and an underground measurement and control instrument; the main control module is connected with the communication module to realize two-way communication; and the main control module is connected with the motor module so as to control and monitor the motor module. The permanent underground passive measurement and control device and system are suitable for the production process with discontinuous tubular columns, the application range of the intelligent measurement and control technology is expanded, and the permanent underground passive measurement and control device and system have extremely high field application value.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield development devices, and in particular to a permanent downhole passive measurement and control device and system. Background Art

[0002] In order to meet the needs of efficient oilfield development and smart oilfield construction, intelligent measurement and control technology is widely used in downhole equipment. Cabled intelligent measurement and control technology is currently widely used in real-time measurement and control of domestic oilfield production wells due to its advantages of high reliability and large amount of communication data. However, cabled intelligent measurement and control technology has its irresistible defects in real-time measurement and control of production wells: first, the cables are bundled on the outside of the oil pipe, which makes the construction complex and costly; second, cabled intelligent measurement and control technology requires that the production string must be continuous, and cabled intelligent measurement and control technology cannot be applied to segmented strings. In order to overcome the above defects, engineering and technical personnel applied wireless power supply and communication technology to real-time measurement and control of production wells, solving the two needs of power supply and data communication required for the normal operation of downhole intelligent equipment.

[0003] Patent CN 109347213 A relates to a non-contact charging method for an intelligent water distributor in an oil field. The specific implementation steps of the method are as follows: the wireless power transmission principle is used in the method, and a charging system is provided, including: a power supply located on the ground, an energy conversion module, an electric energy transmitter, an electric energy receiver and a rectifier, a charging control circuit, and a rechargeable battery + super capacitor. The invention not only solves the problem that the existence of cables in the cable-type intelligent water distribution and injection process greatly increases the cost, but also overcomes the disadvantage of insufficient battery power in the cable-free process. It is simpler, easier to operate, and saves time and effort than the existing mechanical transmission control valve method; the introduction of super capacitors also makes the technology suitable for short-term fast charging. The invention method has a reasonable design, simple structure, easy operation, and stable and reliable performance; the application of this method can greatly improve work efficiency, the application effect is very significant, and the application prospect in oil fields is very broad.

[0004] CN 110994808 B relates to an electromagnetic induction coupling charging device and a charging method for use in an underground environment of an oil field, wherein the electromagnetic induction coupling charging device for use in an underground environment of an oil field comprises a ground host, a bailing instrument part, and an underground device, wherein the ground host is connected to the bailing instrument through a cable, and a primary energy transmitting coil is arranged at the lower end of the bailing instrument; the bailing instrument part comprises 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 compensation circuit, a wireless communication module bailing instrument end, and a power carrier communication bailing instrument end; the underground device comprises a secondary energy pickup coil, a secondary compensation circuit, and a battery pack; when the battery pack is charged, as the bailing instrument is lowered, the primary energy transmitting coil is coaxially sleeved into the secondary energy pickup coil for charging, and after charging is completed, the primary energy transmitting coil is taken out of the well. The invention uses electromagnetic induction coupling power supply technology to charge the battery underground, and the workload is small and simple.

[0005] Patent CN 107707277 B 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. The system is used in the remote control system of the drilling motor of the 1140V power line of the oil field. The system improves the carrier frequency of the power line carrier communication by transforming the existing power line carrier analog front-end circuit, coupling circuit, and back-end PA power amplifier circuit, thereby improving the carrier communication rate and stability and reducing the delay. In addition, by improving the power supply method of the original system to the downhole carrier module, the high-order harmonic noise interference caused by the high-frequency power supply is avoided, and the real-time and stability of the carrier communication are greatly improved. Based on the design of this system, the power line carrier communication performance of the oil drilling platform system has been greatly improved.

[0006] Patent CN 113937904 B discloses a multi-channel wireless power transmission coupling mechanism based on downhole rotary guidance, which relates to the technical field of power transmission devices for downhole rotary guidance in oil drilling. The present invention includes a transmitting end and a receiving end, wherein the transmitting end includes an inner cylinder magnetic core, a primary energy transmitting coil I and a primary energy transmitting coil II; and the receiving end includes an outer cylinder magnetic core, a secondary energy receiving coil I and a secondary energy receiving coil II. The invention adopts two sets of energy transmission channels, which can output two voltages of 48V and 12V, respectively, to power the hydraulic press and the sensor. Two sets of coils are used for two-way power transmission, and the two sets of coils can be stacked and wound together to adopt a DD-Q form of coil combination to achieve isolation of the two-way power transmission, which greatly reduces the volume of the energy transmission system, reduces safety hazards, and can be applied to high-temperature environments underground.

[0007] The above-mentioned comparative patents disclose a non-contact charging method for an underground intelligent water distributor, an electromagnetic induction coupling charging device and charging method, and a multi-channel wireless power transmission coupling mechanism, and mainly introduce the wireless power supply circuit topology and system framework, which are different from the mechanical structure and circuit structure adopted by the invention. The above-mentioned prior arts are greatly different from the present invention and fail to solve the technical problems we want to solve. For this reason, we have invented a new permanent underground passive measurement and control device and system. Summary of the invention

[0008] The object of the present invention is to provide a permanent underground passive measurement and control device and system which can be placed underground for a long time and whose working life is not affected by the battery power.

[0009] The purpose of the present invention can be achieved through the following technical measures: a permanent downhole passive measurement and control device, the permanent downhole passive measurement and control device includes a circuit tube, a current passage and an outer tube, the circuit tube and the current passage are both located in the outer tube, a power module, a motor module, a main control module and a communication module are installed in the circuit tube, and two sections of mutually isolated coils are wound around the outside of the current passage, which are a wireless power supply coil and a wireless communication coil, respectively. The wireless power supply coil is connected to the power module to power the circuit part of the permanent downhole passive measurement and control device; the wireless communication coil is connected to the communication module to realize two-way communication between the permanent downhole passive measurement and control device and the downhole measurement and control instrument; the power module is connected to the motor module, the main control module and the communication module for power supply; the main control module is connected to the communication module to realize two-way communication; the main control module is connected to the motor module to realize control and monitoring of the motor module.

[0010] The purpose of the present invention can also be achieved by the following technical measures:

[0011] The permanent underground passive measurement and control device also includes a first channel and a second channel. The first channel is a cylindrical structure, connecting the current passage and the circuit tube; the second channel is a cylindrical structure, connecting the circuit tube and the outer tube.

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

[0013] The upper and lower ends of the flow passage are respectively connected to the production pipe string, and the well fluid flows in the flow passage.

[0014] The purpose of the present invention can also be achieved through the following technical measures: a permanent downhole passive measurement and control system, which includes a ground control cabinet, a downhole measurement and control instrument, and a permanent downhole passive measurement and control device. The ground control cabinet and the downhole measurement and control instrument are connected by a cable to power the downhole measurement and control instrument and realize two-way communication between the ground control cabinet and the downhole measurement and control instrument; two-way wireless communication is realized between the downhole measurement and control instrument and the permanent downhole passive measurement and control device through electromagnetic waves, and the downhole measurement and control instrument realizes power supply to the permanent downhole passive measurement and control device through electromagnetic waves.

[0015] The purpose of the present invention can also be achieved by the following technical measures:

[0016] The permanent downhole passive measurement and control system adopts a pipe string structure and also includes a suspension packer, which bears the gravity of the entire pipe string.

[0017] The permanent downhole passive measurement and control system adopts a plurality of permanent downhole passive measurement and control devices, and respectively adopts a plurality of layered packers to isolate the plurality of permanent downhole passive measurement and control devices in different production layers.

[0018] The suspended packer, the permanent downhole passive measurement and control device, and the layered packer are connected from top to bottom through oil pipes, and the bottom of the oil pipes is in a plugged state.

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

[0020] The permanent downhole passive measurement and control device comprises a circuit tube, a current passage and an outer tube, wherein the circuit tube and the current passage are both located inside the outer tube, and a power module, a motor module, a main control module and a communication module are installed in the circuit tube. Two sections of mutually isolated coils are wound around the outside of the current passage, which 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 circuit part of the permanent downhole passive measurement and control device; the wireless communication coil is connected to the communication module to realize two-way communication between the permanent downhole passive measurement and control device and the downhole measurement and control instrument; the power module is connected to the motor module, the main control module and the communication module to supply power; the main control module is connected to the communication module to realize two-way communication; the main control module is connected to the motor module to realize control and monitoring of the motor module.

[0021] The permanent underground passive measurement and control device also includes a first channel and a second channel. The first channel is a cylindrical structure, connecting the current channel and the circuit tube; the second channel is a cylindrical structure, connecting the circuit tube and the outer tube.

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

[0023] The upper and lower ends of the flow passage are respectively connected to the production pipe string, and the well fluid flows in the flow passage.

[0024] The downhole measurement 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 cable communication module, one end of the cable is connected to the second power supply module and the cable communication module, and the other end is connected to the ground control cabinet; the second power supply module is respectively connected to the second main control module, the sensor module, the wireless communication module and the second power supply module, and provides them with electric energy; the second main control module is respectively connected to the cable communication module and the wireless communication module, and realizes two-way communication respectively; the wireless communication module is connected to the second wireless communication coil, and sends the wireless communication signal 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 sends the electric energy to the external space through the second wireless power supply coil, the sensor module is connected to the second main control module, and the sensor signal collected is transmitted to the second main control module, and the second main control module sends it to the cable communication module, so as to be transmitted to the ground control cabinet.

[0025] The motor module transmits the monitored motor status signal to the main control module, and 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 main control module, and the cable communication module.

[0026] The permanent underground passive measurement and control device and system in the present invention adopts wireless electromagnetic coupling for power supply and communication. The underground intelligent measurement and control device is in the well all year round and has no battery. The underground intelligent measurement and control device is powered and communicated by a wireless transmitter. Compared with the battery-powered underground intelligent measurement and control device, the permanent underground passive measurement and control device can be placed underground for a long time, and its working life is not affected by the battery power. When it needs to be measured and controlled, the underground measurement and control instrument is lowered to activate it wirelessly, and two-way communication is performed to read the motor opening and control the motor operation. The use of a power supply method that is available as needed avoids the problem of being unable to charge underground when the underground temperature exceeds 85°C. Compared with the intelligent measurement and control technology with cables, the permanent underground passive measurement and control system does not need to bundle cables and cable couplings outside the oil pipe, which not only simplifies the construction process, but also saves costs, and is suitable for discontinuous production processes of pipe strings, expanding the application scope of intelligent measurement and control technology. This technology has extremely high field application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a pipe string of a permanent downhole passive measurement and control system in a specific embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of a permanent underground passive measurement and control device in a specific embodiment of the present invention;

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

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

[0031] The figure includes: control cabinet 1, cable 2, downhole measurement and control instrument 3, suspension packer 4, layered packer 5, permanent downhole passive measurement and control device 6, permanent downhole passive measurement and control device 7, oil pipe 8, casing 9, annular space d1, 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 passage b3, second passage b4, outer cylinder b5;

[0034] Wireless power supply coil c1, wireless communication coil c2, power supply module c3, wireless communication module c4, sensor module c5, main control module c6, power supply module c7, cable communication module c8, cable c9. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

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

[0037] A permanent downhole passive measurement and control system comprises three parts: a ground control cabinet, a downhole measurement and control instrument, and a permanent downhole passive measurement and control device. The ground control cabinet and the downhole measurement and control instrument are connected by a cable to realize power supply to the downhole measurement and control instrument and realize two-way communication between the ground control cabinet and the downhole measurement and control instrument; the downhole measurement and control instrument and the permanent downhole passive measurement and control device realize two-way wireless communication through electromagnetic waves, and the downhole measurement and control instrument realizes power supply to the permanent downhole passive measurement and control device through electromagnetic waves.

[0038] The permanent underground passive measurement and control device is as follows: Figure 2 and Figure 3 It is connected to the production string through the oil pipe and mainly consists of mechanical part and circuit part.

[0039] The circuit part includes: power module a1, motor module a2, main control module a3, communication module a4, wireless power supply coil a5, and wireless communication coil a6. The wireless power supply coil a5 is connected to the power module a1 through wires to supply power to the circuit part of the permanent downhole passive measurement and control device; the wireless communication coil a6 is connected to the communication module a4 through wires to realize two-way communication between the permanent downhole passive measurement and control device and the downhole measurement and control instrument; the power module a1 is connected to the motor module a2, the main control module a3, and the communication module a through wires to supply power; the main control module a3 is connected to the communication module a4 through wires to realize two-way communication; the main control module a3 is connected to the motor module a2 through wires to realize control and monitoring of the motor module a2;

[0040] The mechanical part includes: circuit tube b1, flow channel b2, first channel b3, second channel b4, outer tube b5; wherein the circuit tube b1 is internally installed with: power module a1, motor module a2, main control module a3, communication module a4; flow channel b2, the flow channel b2 is connected to the production pipe at its upper and lower ends respectively, and the well fluid flows in the flow channel b2. Two mutually isolated coils are wound around the outside of the flow channel b2, which are the wireless power supply coil a5 and the wireless communication coil a6 respectively; the first channel b3 is a cylindrical structure, connecting the flow channel b2 and the circuit tube b1; the second channel b4 is a cylindrical structure, connecting the circuit tube b1 and the outer tube b5. The first channel b3 and the second channel b4 are connected to the corresponding position of the motor module a2 in the circuit tube b1. The on-off and opening of the first channel b3 and the second channel b4 are controlled by the motor module a2;

[0041] The downhole measurement and control instrument includes: Figure 4As shown. Wireless power supply coil c1, wireless communication coil c2, power supply module c3, wireless communication module c4, sensor module c5, main control module c6, power supply module c7, cable communication module c8, cable c9; one end of cable c9 is connected to power supply module c7 and cable communication module c8; the other end of cable c9 is connected to ground control cabinet 1; power supply module c7 is connected to main control module c6, sensor module c5, wireless communication module c4 and power supply module c3 through wires, and provides them with electric energy; main control module c6 is connected to cable communication module c8 and wireless communication module c4, and realizes two-way communication respectively; wireless communication module c4 is connected to wireless communication coil c2, and sends wireless communication signals to external space through wireless communication coil c2; power supply module c3 is connected to wireless power supply coil c1, and sends electric energy to external space through wireless power supply coil c1;

[0042] A permanent underground passive measurement and control system includes three parts: a ground control cabinet, an underground measurement and control instrument, and a permanent underground passive measurement and control device. Figure 1 As shown, the pipe string structure of the permanent downhole passive measurement and control system. The pipe string structure of the permanent downhole passive measurement and control system includes: a control cabinet 1, a cable 2, a downhole measurement and control instrument 3, a hanging packer 4, a layered packer 5, a permanent downhole passive measurement and control device 6, a permanent downhole passive measurement and control device 7, an oil pipe 8, and a casing 9; the control cabinet 1 and the downhole measurement and control instrument 3 are connected by a cable 2 to realize two-way communication between the two, and realize the power supply of the control cabinet 1 to the downhole measurement and control instrument 3; the hanging packer 4, the permanent downhole passive measurement and control device 6, the layered packer 5, and the permanent downhole passive measurement and control device 7 are connected from top to bottom through the oil pipe, and the bottom of the oil pipe is in a plugged state; the hanging packer 4 mainly bears the gravity of the entire pipe string. The function of the layered packer 5 is to separate the two production layers so that the liquids are not connected. The function of the permanent downhole passive measurement and control devices 6 and 7 is to open, close or adjust the opening of the liquid communication channel between the production layer and the production pipe string;

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

[0044] The working principle of the two-way communication part is: from the wellhead to the underground communication, the ground control cabinet 1 transmits the communication signal to the underground measurement and control instrument 3 through the cable 2. The cable communication module c8 in the underground measurement and control instrument 3 converts the signal into a signal that can be recognized by the main control module c6. After analysis, the main control module c6 sends the communication signal to the wireless communication module c4, and the wireless communication module sends the communication signal to the wireless communication coil c2; then it is sent to the space in the wellbore through electromagnetic waves; in the permanent underground passive measurement and control device, the wireless communication coil a6 receives the electromagnetic wave and transmits it to the communication module a4, and then transmits it to the main control module a3. After the main control module a3 analyzes the instruction, it issues a corresponding instruction to the motor module a2; from the underground to the wellhead communication, the motor monitoring circuit in the motor module a2 transmits the motor status signal to the main control module a3, and then a4, a6, c2, c4, c6, c8, 2, 1; the sensor module c5 in the underground measurement and control instrument 2 can include a variety of sensors, including but not limited to temperature, pressure, flow, and water content sensors. The sensor module c5 can transmit the tested sensor signal to the ground control cabinet along the directions of c6, c8, 2, and 1;

[0045] Power supply working principle: the control cabinet 1 transmits electric energy to the power module c7 in the downhole measurement and control instrument 3 through the cable 2. After the voltage of c7 is converted, it supplies power to the modules c3, c4, c5, c6 and c8 respectively. After the c3 module performs high-frequency inversion and resonance compensation on the current, it is coupled to the wireless power supply coil c1 and sent to the space in the wellbore. After the wireless power supply coil a5 in the permanent downhole passive measurement and control device receives the wireless power signal, it is sent to the power module a1. After the voltage of the power module a1 is converted, it supplies power to the motor module a2, the main control module a3 and the communication module a4 respectively.

[0046] Flow process of liquid flow channel: for self-flowing oil wells, the liquid in the lower production layer flows from the formation into the annular space d1 surrounded by the casing 9, the layered packer 5, the oil pipe 8 and the permanent downhole passive measurement and control device 7. When the motor module a2 on the permanent downhole passive measurement and control device 7 moves, the second channel b4 is connected with the first channel b3, and the flow channel b2 is connected with the annular space d1; the liquid in the upper production layer flows from the formation into the annular space d2 surrounded by the hanging packer 4, the oil pipe 8, the permanent downhole passive measurement and control device 6 and the casing 9; when the motor module a2 on the permanent downhole passive measurement and control device 6 moves, the second channel b4 is connected with the first channel b3, and the flow channel b2 is connected with the annular space d2; the formation fluid flows into the inside of the oil pipe and flows upward out of the wellhead; for water injection wells, the liquid flows in the opposite direction.

[0047] The following are several specific embodiments of the present invention.

[0048] Example 1 Bidirectional wireless communication method for a permanent underground passive measurement and control system

[0049] The downhole measuring and controlling instrument 3 is connected to the control cabinet 1 through the cable 2 and lowered into the well near the permanent downhole passive measuring and controlling device. The ground control cabinet 1 transmits the communication signal to the downhole measuring and controlling instrument 3 through the cable 2. The cable communication module c8 in the downhole measurement and control instrument 3 converts the signal into a signal recognizable by the main control module c6. After analysis, the main control module c6 sends the communication signal to the wireless communication module c4. The wireless communication module c4 sends the communication signal to the wireless communication coil c2; then it is sent to the space in the wellbore through electromagnetic waves; in the permanent downhole passive measurement and control device, the wireless communication coil a6 receives the electromagnetic wave and transmits it to the communication module a4, and then to the main control module a3. After the main control module a3 analyzes the instruction, it sends the corresponding instruction to the motor module a2; from the downhole to the wellhead communication, the motor monitoring circuit in the motor module a2 transmits the motor status signal to the main control module a3, and then a4, a6, c2, c4, c6, c8, 2, 1; the sensor module c5 in the downhole measurement and control instrument 2 can include a variety of sensors, including but not limited to temperature, pressure, flow, and water content sensors. The sensor module c5 can transmit the tested sensor signal to the ground control cabinet along the directions of c6, c8, 2, 1;

[0050] Example 2 Wireless power supply method for permanent underground passive measurement and control system

[0051] The downhole measurement and control instrument 3 is connected to the wellhead control cabinet through cable 2, and lowered into the well near the permanent downhole passive measurement and control device. The control cabinet 1 transmits electric energy to the power module c7 in the downhole measurement and control instrument 3 through cable 2. After voltage conversion, c7 supplies power to modules c3, c4, c5, c6, and c8 respectively; module c3 performs high-frequency inversion and resonance compensation on the current, and then couples it to the wireless power supply coil c1; it is sent to the space in the wellbore; after receiving the wireless power signal, the wireless power supply coil a5 of the permanent downhole passive measurement and control device sends it to the power module a1; after voltage conversion, the power module a1 supplies power to the motor module a2, the main control module a3, and the communication module a4 respectively;

[0052] Example 3: Permanent Downhole Passive Measurement and Control System String Structure

[0053] The pipe string structure of the permanent downhole passive measurement and control system includes: a control cabinet 1, a cable 2, a downhole measurement and control instrument 3, a hanging packer 4, a layered packer 5, a permanent downhole passive measurement and control device 6, a permanent downhole passive measurement and control device 7, an oil pipe 8, and a casing 9; the control cabinet 1 and the downhole measurement and control instrument 3 are connected by a cable 2 to realize two-way communication between the two and realize the power supply of the control cabinet 1 to the downhole measurement and control instrument 3; the hanging packer 4, the permanent downhole passive measurement and control device 6, the layered packer 5, and the permanent downhole passive measurement and control device 7 are connected from top to bottom by the oil pipe, and the bottom of the oil pipe is in a plugged state; the hanging packer 4 mainly bears the gravity of the entire pipe string. The layered packer 5 is used to separate two production layers so that the liquid is not connected. The function of the permanent downhole passive measurement and control devices 6 and 7 is to open, close or adjust the opening of the liquid communication channel between the production layer and the production tubing. For the production tubing for simultaneous production of multiple layers, multiple sets of layered packers and permanent downhole passive measurement and control devices can be alternately connected at the lower end of the oil pipe 8.

[0054] Finally, it should be noted that the above is only 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

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

Claims

1. A permanent underground passive measurement and control device, characterized in that: The permanent downhole passive measurement and control device comprises a circuit tube, a current passage and an outer tube, wherein the circuit tube and the current passage are both located inside the outer tube, a power module, a motor module, a main control module and a communication module are installed in the circuit tube, and two sections of mutually isolated coils are wound around the outside of the current passage, which are a wireless power supply coil and a wireless communication coil respectively. The wireless power supply coil is connected to the power module to supply power to the circuit part of the permanent downhole passive measurement and control device; the wireless communication coil is connected to the communication module to realize two-way communication between the permanent downhole passive measurement and control device and the downhole measurement and control instrument; the power module is connected to the motor module, the main control module and the communication module to supply power; the main control module is connected to the communication module to realize two-way communication; the main control module is connected to the motor module to realize control and monitoring of the motor module.

2. The permanent underground passive measurement and control device according to claim 1 is characterized in that: The permanent underground passive measurement and control device also includes a first channel and a second channel. The first channel is a cylindrical structure, connecting the current passage and the circuit tube; the second channel is a cylindrical structure, connecting the circuit tube and the outer tube.

3. The permanent underground passive measurement and control device according to claim 2 is characterized in that: The first channel and the second channel are respectively connected to corresponding positions of the motor module in the circuit tube, and the motor module controls the on / off and opening degree of the first channel and the second channel.

4. The permanent underground passive measurement and control device according to claim 1 is characterized in that: The upper and lower ends of the flow passage are respectively connected to the production pipe string, and the well fluid flows in the flow passage.

5. Permanent underground passive measurement and control system, characterized in that: The permanent downhole passive measurement and control system includes a ground control cabinet, a downhole measurement and control instrument, and a permanent downhole passive measurement and control device. The ground control cabinet and the downhole measurement and control instrument are connected by a cable to power the downhole measurement and control instrument and realize two-way communication between the ground control cabinet and the downhole measurement and control instrument; two-way wireless communication is realized between the downhole measurement and control instrument and the permanent downhole passive measurement and control device through electromagnetic waves, and the downhole measurement and control instrument realizes power supply to the permanent downhole passive measurement and control device through electromagnetic waves.

6. The permanent underground passive measurement and control system according to claim 5 is characterized in that: The permanent downhole passive measurement and control system adopts a pipe string structure and also includes a suspension packer, which bears the gravity of the entire pipe string.

7. The permanent underground passive measurement and control system according to claim 6 is characterized in that: The permanent downhole passive measurement and control system adopts a plurality of permanent downhole passive measurement and control devices, and respectively adopts a plurality of layered packers to isolate the plurality of permanent downhole passive measurement and control devices in different production layers.

8. The permanent underground passive measurement and control system according to claim 7 is characterized in that: The suspended packer, the permanent downhole passive measurement and control device, and the layered packer are connected from top to bottom through oil pipes, and the bottom of the oil pipes is in a plugged state.

9. The permanent underground passive measurement and control system according to claim 7, characterized in that: The permanent downhole passive measurement and control device opens, closes or adjusts the opening of the liquid communication channel between the production layer and the production pipe string.

10. The permanent underground passive measurement and control system according to claim 5, characterized in that: The permanent downhole passive measurement and control device comprises a circuit tube, a current passage and an outer tube, wherein the circuit tube and the current passage are both located inside the outer tube, and a power module, a motor module, a main control module and a communication module are installed in the circuit tube. Two sections of mutually isolated coils are wound around the outside of the current passage, which 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 circuit part of the permanent downhole passive measurement and control device; the wireless communication coil is connected to the communication module to realize two-way communication between the permanent downhole passive measurement and control device and the downhole measurement and control instrument; the power module is connected to the motor module, the main control module and the communication module to supply power; the main control module is connected to the communication module to realize two-way communication; the main control module is connected to the motor module to realize control and monitoring of the motor module.

11. The permanent underground passive measurement and control system according to claim 10, characterized in that: The permanent underground passive measurement and control device also includes a first channel and a second channel. The first channel is a cylindrical structure, connecting the current channel and the circuit tube; the second channel is a cylindrical structure, connecting the circuit tube and the outer tube.

12. The permanent underground passive measurement and control system according to claim 11, characterized in that: The first channel and the second channel are respectively connected to corresponding positions of the motor module in the circuit tube, and the motor module controls the on / off and opening degree of the first channel and the second channel.

13. The permanent underground passive measurement and control system according to claim 10, characterized in that: The upper and lower ends of the flow passage are respectively connected to the production pipe string, and the well fluid flows in the flow passage.

14. The permanent underground passive measurement and control system according to claim 10, characterized in that: The downhole measurement 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 cable communication module, one end of the cable is connected to the second power supply module and the cable communication module, and the other end is connected to the ground control cabinet; the second power supply module is respectively connected to the second main control module, the sensor module, the wireless communication module and the second power supply module, and provides them with electric energy; the second main control module is respectively connected to the cable communication module and the wireless communication module, and realizes two-way communication respectively; the wireless communication module is connected to the second wireless communication coil, and sends the wireless communication signal 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 sends the electric energy to the external space through the second wireless power supply coil, the sensor module is connected to the second main control module, and the sensor signal collected is transmitted to the second main control module, and the second main control module sends it to the cable communication module, so as to be transmitted to the ground control cabinet.

15. The permanent underground passive measurement and control system according to claim 14, characterized in that: The motor module transmits the monitored motor status signal to the main control module, and 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 main control module, and the cable communication module.

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