Underground flow intelligent control valve driven by hollow torque motor

Abstract

The utility model discloses an intelligent underground flow control valve driven by a hollow torque motor, which relates to the field of flow control and comprises a main body supporting and connecting structure and an internal transmission structure, the internal transmission structure is composed of a hollow torque motor used for providing power and a cone valve assembly used for preventing movement, the hollow torque motor is connected with a cross-shaped sliding ring at the right end in a matched mode, the cross-shaped sliding ring is connected with a hollow speed reducer in a matched mode, and a flange is arranged at the right end of the hollow speed reducer and connected with a central rotating pipe in a spline mode. The central rotating pipe is connected with the cone valve assembly in a key groove matching manner; the hollow torque motor is adopted as a driver, an intelligent control system is arranged, underground flow and pressure parameters can be monitored in real time, automatic adjustment is carried out according to a preset control strategy, and stepless regulation and control of the flow are achieved.

Description

Technical Field

[0001] The utility model relates to the field of flow control, and more specifically to an underground flow intelligent control valve driven by a hollow torque motor. Background Art

[0002] In the process of oilfield injection and production, it is crucial to accurately control the downhole flow rate. Traditional downhole flow control devices have problems such as large size, heavy weight, and low control accuracy, and are difficult to adapt to the complex oilfield environment and real-time production needs. The utility model aims to provide a downhole flow intelligent control valve driven by a hollow torque motor. The device adopts a hollow torque motor as a driver and is equipped with an intelligent control system. It can monitor the downhole flow and pressure parameters in real time, and automatically adjust according to the preset control strategy to achieve stepless flow control, ensuring that the downhole flow runs stably within the set range, thereby improving oilfield production efficiency and reducing production costs. It has significant technical advantages and economic value. Utility Model Content

[0003] The purpose of the utility model is to provide a hollow torque motor driven underground flow intelligent control valve, which can be quickly fixed to the pallet through fixing parts at both ends; then tighten the first strap and the second strap, and with the cooperation of the buckle, the first strap and the second strap can fix the pallet and the load, with a simple structure and convenient operation, which greatly saves manpower. In order to solve the technical problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A downhole flow intelligent control valve driven by a hollow torque motor, comprising a main body support connection structure and an internal transmission structure;

[0006] Among them, the main support connection structure for fixing the downhole flow intelligent control valve includes a female head and a split nut A; the female head is fixedly connected to the split nut A, and the split nut A, the control cavity outer tube, the sensor fixing seat, the motor cavity housing, the valve housing, the outer housing, and the split nut B are threadedly connected to the right in sequence;

[0007] The main support connection structure also includes a central liquid pipe for discharging crude oil, and a male head fixing seat, a cable connector and a male head for transmitting signals to the downhole flow intelligent control valve;

[0008] The split nut B is fixedly connected to the male head fixing seat, the cable connector and the male head are respectively threadedly connected to the male head fixing seat, and the central liquid pipe for supporting the connection and sealing is provided between the female head and the sensor fixing seat;

[0009] The internal transmission structure is composed of a hollow torque motor for providing power and a cone valve assembly for preventing movement, wherein the hollow torque motor is connected with the cross slip ring at the right end, the cross slip ring is connected with the hollow reducer, and the right end of the hollow reducer is provided with a flange, the flange is spline-connected with the center rotating tube, and the center rotating tube is connected with the cone valve assembly through a keyway; the hollow torque motor is used as a driver;

[0010] A dynamic sealing valve sleeve is provided at the right end of the cone valve assembly; wherein, a dynamic sealing unit A, a motor end sealing seat, an angular contact bearing, a ferrule, a ferrule fixing seat and a motor end swivel seat are provided at the left end of the central rotating tube, and a reducer end swivel seat, an angular contact bearing, a reducer end sealing seat and a dynamic sealing unit B are provided at the right end of the central rotating tube.

[0011] As a further technical solution of the utility model, three sealing ring structures are provided on the cone valve assembly, wherein the dynamic seal A and the dynamic seal B at the front middle end ensure the connection of the threaded pair.

[0012] As a further technical solution of the utility model, two pressure sensors are arranged inside the tool, namely, pressure sensor A and pressure sensor B. Pressure sensor A detects the pressure before the valve, and pressure sensor B detects the pressure after the valve.

[0013] As a further technical solution of the utility model, a tool ring cavity is provided at one end of the pressure sensor A close to the outer tube of the control cavity, and a control unit is arranged inside the tool ring cavity, and a single-core cable channel is reserved for transmitting electric energy and signals between the ground and underground and realizing intelligent flow regulation.

[0014] As a further technical solution of the utility model, dynamic sealing units are provided at both ends of the central rotating tube to ensure that there is no leakage of liquid; and angular contact bearings are provided at both ends of the sealing unit to ensure the coaxiality of the central rotating tube, and bearing clamps are provided at both ends of the central rotating tube to eliminate axial clearance and ensure the stability of opening adjustment.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model adopts a cone valve adjustment form for the intelligent control valve. By sending instructions to the hollow torque motor through the control unit, the downhole flow can be controlled steplessly, providing assistance for refined stratified injection and production;

[0017] 2. The utility model adopts a cone valve to perform rotational linear motion, and through the large torque output of the hollow torque motor, it can realize the functions of pushing sand and scraping wax in the well, ensuring the long-term use of the tool in the well;

[0018] 3. The utility model has two pressure sensors inside the tool, one for detecting the pressure before the valve and the other for detecting the pressure after the valve, which can realize the detection function of differential pressure flow. When the flow is 0-400 cubic meters, the flow error is ±3%; when the flow is 400-2000 cubic meters, the flow error is ±5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure diagram of a downhole flow intelligent control valve driven by a hollow torque motor.

[0020] Figure 2 The figure is a schematic diagram of a transmission mechanism of a downhole flow intelligent control valve driven by a hollow torque motor.

[0021] Figure 3 This is a schematic diagram of a cone valve assembly of a downhole flow intelligent control valve driven by a hollow torque motor.

[0022] Figure 4 The figure is a schematic diagram of a communication control system for a downhole flow intelligent control valve driven by a hollow torque motor.

[0023] Figure 5 The figure is a schematic diagram of a process string for a downhole flow intelligent control valve driven by a hollow torque motor.

[0024] In the figure: 1. Female head; 2. Split nut A; 3. Control cavity outer tube; 4. Center liquid pipe; 5. Control unit; 6. Pressure sensor A; 7. Sensor fixing seat; 8. Dynamic seal unit A; 9. Motor end seal seat; 10. Motor end stop seat; 11. Motor cavity housing; 12. Center rotating tube; 13. Flange; 14. Reducer end stop seat; 15. Reducer end seal seat; 16. Dynamic seal unit B; 17. Dynamic seal A; 18. Valve housing; 19. Cone valve assembly; 20. Dynamic seal valve sleeve; 21. Outer housing; 22. Split nut B; 23. Male head fixing seat; 24. Cable connector; 25. Male head; 26. Car-type dynamic seal; 27. Dynamic seal B; 28. Hollow reducer; 29. ​​Cross slip ring; 30. Hollow torque motor; 31. Cardan fixing seat; 32. Cardan; 33. Angular contact bearing; 34. Pressure sensor B;

[0025] 1-1, ground control device; 1-2, carrier signal; 1-3, DC voltage; 1-4, downhole tool control unit;

[0026] 2-1. Intelligent control box; 2-2. Cable; 2-3. Pump; 2-4. Intelligent control valve; 2-5. Cable packer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 As shown, the utility model is a hollow torque motor driven downhole flow intelligent control valve, including a main body support connection structure and an internal transmission structure; wherein the main body support connection structure includes a female head 1, a split nut A2, a control cavity outer tube 3, a central liquid pipe 4, a sensor fixing seat 7, a motor cavity housing 11, a valve housing 18, an outer housing 21, a split nut B22, a male head fixing seat 23, a cable connector 24 and a male head 25; the internal transmission structure includes a control unit 5, a pressure sensor A 6. dynamic seal unit A8, motor end seal seat 9, motor end stop seat 10, central rotating tube 12, flange 13, reducer end stop seat 14, reducer end seal seat 15, dynamic seal unit B16, dynamic seal A17, cone valve assembly 19, dynamic seal valve sleeve 20, car-type dynamic seal 26, dynamic seal B27, hollow reducer 28, cross slip ring 29, hollow torque motor 30, ferrule fixing seat 31, ferrule 32, angular contact bearing 33 and pressure sensor B34.

[0029] Combination Figure 1 and Figure 2 In a main supporting and connecting structure of a downhole flow intelligent control valve driven by a hollow torque motor, a female head 1 is fixedly connected with a split nut A2, and the split nut A2, a control cavity outer tube 3, a sensor fixing seat 7, a motor cavity housing 11, a valve housing 18, an outer housing 21, and a split nut B22 are threadedly connected in sequence, and the split nut B22 is fixedly connected with a male head fixing seat 23, and a cable connector 24 and a male head 25 are threadedly connected with the male head fixing seat 23 respectively, and a central liquid pipe 4 plays a supporting connection and sealing role between the female head 1 and the sensor fixing seat 7; in the internal transmission structure, a hollow torque motor 30 is matched with a right end cross slip ring 29 The cross slip ring 29 cooperates with the hollow reducer 28, the right end of the hollow reducer 28 is provided with a flange 13, the flange 13 is spline-connected to the central rotating tube 12, the central rotating tube 12 is key-connected to the cone valve assembly 19, and the right end of the cone valve assembly 19 is provided with a dynamic sealing valve sleeve 20; wherein, the left end of the central rotating tube 12 is provided with a dynamic sealing unit A8, a motor end sealing seat 9, an angular contact bearing 33, a ferrule 32, a ferrule fixing seat 31 and a motor end stop seat 10, and the right end is provided with a reducer end stop seat 14, an angular contact bearing 33, a reducer end sealing seat 15 and a dynamic sealing unit B16, to ensure that the internal structure is compact and free of movement.

[0030] In this embodiment, dynamic sealing units A8 and B16 are provided at both ends of the central rotating tube 12 to ensure that there is no leakage of liquid; and angular contact bearings 33 are provided at both ends to ensure the coaxiality of the central rotating tube; bearing clamps are provided at both ends to eliminate the axial gap of the central rotating tube 12 and ensure the stability of the opening adjustment.

[0031] In this embodiment, the hollow torque motor 30 has a large output torque and can realize large-diameter flow through the concentric pipe column; the cross slip ring 29 is a flexible connection to ensure the coaxiality of the hollow torque motor 30 and the hollow reducer 28, thereby improving the transmission efficiency.

[0032] like Figure 3 As shown, in this embodiment, the cone valve assembly 19 is provided with three sealing ring structures, wherein the front middle end dynamic seal A17 and the dynamic seal B27 ensure the connection of the threaded pair to prevent acid corrosion, sand jamming, and wax deposition in the well, which may cause the cone valve to be unable to adjust; wherein the rear end car-type dynamic seal 26 ensures the internal and external sealing of the tool, and can realize the pressure sealing of the packer in the overall process string.

[0033] In this embodiment, two pressure sensors A6 and B34 are provided inside the tool, one for detecting the pressure before the valve and the other for detecting the pressure after the valve. Based on the principle of mutual conversion of mechanical energy of the fluid and the temperature and pressure compensation system, the flow detection function is realized by the pressure difference method.

[0034] In this embodiment, a tool ring cavity is provided at one end of the pressure sensor A6 close to the outer tube 3 of the control cavity, and a control unit 5 is arranged inside the tool ring cavity, and a single-core cable channel is reserved, which can realize the transmission of electric energy and signals between the ground and the underground, and realize intelligent flow regulation.

[0035] like Figure 4 As shown, in this embodiment, in a downhole flow intelligent control valve communication control system driven by a hollow torque motor, a DC power line is used to superimpose a digital audio signal to achieve unidirectional power supply and bidirectional digital communication. The ground control device 1-1 transmits a DC voltage 1-3 and a carrier signal 1-2 superimposed thereon through a cable. After the downhole tool control unit 1-4 couples and separates the carrier DC, the voltage is used for equipment power supply and working use, and the carrier signal enters the carrier circuit, and the carrier signal is converted into serial port data to realize data transmission.

[0036] like Figure 5 As shown, in this embodiment, the ground intelligent control box 2-1 in the horizontal well process string transmits voltage and control signals through the cable 2-2, the upper end is the pump 2-3, and the intelligent control valve 2-4 and the cable packer 2-5 in the downhole tool string are connected in series in sequence to realize layered operation, wherein the cable passes through the intelligent control valve 2-4 and the cable packer 2-5 in sequence, and the opening adjustment of each layer of the control valve is realized through carrier communication.

[0037] The working principle of the utility model is as follows: in actual work, the control unit 5 controls the hollow torque motor 30 to rotate through instructions, and the hollow torque motor 30 drives the hollow reducer 28 to rotate through the cross slip ring 29, wherein the cross slip ring 29 is flexibly connected to ensure the coaxiality of the hollow torque motor 30 and the hollow reducer 28, thereby improving the transmission efficiency; the hollow reducer 28 is provided with an output flange 13, the output flange 13 is spline-connected to the central rotating tube 12, the right end of the central rotating tube 12 is provided with a long keyway, the cone valve assembly 19 has a built-in convex key, and the cone valve assembly 19 is connected to the center The rotating tube 12 is slidably connected with the keyway through the convex key; when the central rotating tube 12 rotates and drives the cone valve assembly 19 to rotate, the cone valve assembly 19 is made to rotate linearly through the valve shell 18 thread, and the flow area between the end of the cone valve and the liquid hole is changed to realize stepless regulation of the downhole flow, providing assistance for refined stratified injection and production; pressure sensors A and B34 are arranged inside the tool to detect the pressure before and after the valve, and the pressure differential flow detection function can be realized. When the flow is 0-400 cubic meters, the flow error is ±3%; when the flow is 400-2000 cubic meters, the flow error is ±5%.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hollow torque motor driven downhole flow intelligent control valve, characterized in that: It includes a main body supporting and connecting structure and an internal transmission structure; The main body supporting connection structure for fixing the downhole flow intelligent control valve comprises a female head (1) and a split nut A (2); the female head (1) is fixedly connected to the split nut A (2), and is threadedly connected to the split nut A (2), the control cavity outer tube (3), the sensor fixing seat (7), the motor cavity housing (11), the valve housing (18), the outer housing (21), and the split nut B (22) in sequence to the right; The main body supporting connection structure also includes a central liquid pipe (4) for discharging crude oil, and a male head fixing seat (23), a cable connector (24) and a male head (25) for transmitting signals to a downhole flow intelligent control valve; The split nut B (22) is fixedly connected to the male head fixing seat (23), the cable connector (24) and the male head (25) are respectively threadedly connected to the male head fixing seat (23), and the central liquid pipe (4) for supporting, connecting and sealing is provided between the female head (1) and the sensor fixing seat (7); The internal transmission structure is composed of a hollow torque motor (30) for providing power and a cone valve assembly (19) for preventing movement, wherein the hollow torque motor (30) is connected with a cross slip ring (29) at the right end, the cross slip ring (29) is connected with a hollow reducer (28), and a flange (13) is provided at the right end of the hollow reducer (28), the flange (13) is spline-connected with a central rotating tube (12), and the central rotating tube (12) is connected with the cone valve assembly (19) through a keyway; the hollow torque motor (30) is used as a driver; The right end of the cone valve assembly (19) is provided with a dynamic sealing valve sleeve (20); wherein, the left end of the central rotating tube (12) is provided with a dynamic sealing unit A (8), a motor end sealing seat (9), an angular contact bearing (33), a ferrule (32), a ferrule fixing seat (31) and a motor end stop seat (10), while the right end of the central rotating tube (12) is provided with a reducer end stop seat (14), an angular contact bearing (33), a reducer end sealing seat (15) and a dynamic sealing unit B (16).

2. The hollow torque motor driven downhole flow intelligent control valve according to claim 1 is characterized in that: The cone valve assembly (19) is provided with three sealing ring structures, wherein the dynamic seal A (17) and the dynamic seal B (27) at the front middle end ensure the threaded pair connection.

3. The hollow torque motor driven downhole flow intelligent control valve according to claim 1 is characterized in that: Two pressure sensors, pressure sensor A (6) and pressure sensor B (34), are arranged inside the tool. Pressure sensor A (6) detects the pressure before the valve, and pressure sensor B (34) detects the pressure after the valve.

4. The hollow torque motor driven downhole flow intelligent control valve according to claim 3 is characterized in that: The pressure sensor A (6) is provided with a tool ring cavity at one end close to the outer tube (3) of the control cavity, and a control unit (5) is arranged inside the tool ring cavity, and a single-core cable channel is reserved for transmitting electric energy and signals between the ground and underground and realizing intelligent flow regulation.

5. The hollow torque motor driven downhole flow intelligent control valve according to claim 1 is characterized in that: Both ends of the central rotating tube (12) are provided with dynamic sealing units to ensure that there is no leakage of liquid; and both ends of the sealing unit are provided with angular contact bearings (33) to ensure the coaxiality of the central rotating tube (12); and both ends of the central rotating tube (12) are provided with bearing clamps to eliminate axial clearance and ensure the stability of opening adjustment.

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