Well repair power faucet driven by permanent magnet variable frequency motor
Through the permanent magnet frequency converter motor drive and reverse torque release device, the inconvenient speed regulation and anti-torque hazard of power faucets are solved, and efficient and safe power faucet control and reverse torque release are achieved.
Patent Information
- Application Number
- CN202422505543.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-16
AI Technical Summary
The existing powered faucets driven by hydraulic and DC motors have inconvenient speed regulation, low energy utilization efficiency, complex control, and the possible anti-torque hazards when long drilling tools rotate in the well.
The permanent magnet frequency converter motor is driven by a reduction system and an anti-torque release device. The brake circuit is formed through the inverter and the brake resistor to achieve flexible control of the power faucet and safe release of the anti-torque.
It realizes efficient energy utilization, clean control, safe and reliable operation of the power faucet, and can effectively release the counter torque formed by the long drill tool during rotation to avoid accidents.
Smart Images
Figure CN223164469U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power swivels, and particularly relates to a workover power swivel driven by a permanent magnet variable frequency motor. Background Art
[0002] In oil and gas workover operations, existing swivels are generally driven by hydraulic motors, and there are also power swivels driven by DC motors abroad. The power swivels driven by hydraulic drive and DC motors have disadvantages such as inconvenient speed regulation, low overall energy utilization efficiency, and relatively lagged control signal and output response. At the same time, during the rotation of the drill string thousands of meters long in the well, a counter torque will be formed due to the torque, and if the drill string rotates rapidly in reverse, dangerous situations may occur. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a workover power swivel driven by a permanent magnet variable frequency motor to solve one or more of the above problems.
[0004] A workover power swivel driven by a permanent magnet variable frequency motor provided by the utility model includes a housing. A central pipe, a permanent magnet variable frequency motor and a reduction system are arranged inside the housing. The permanent magnet variable frequency motor is of a hollow structure. The output end of the permanent magnet variable frequency motor is connected to the reduction system and serves as the input end of the reduction system. The central pipe passes through the hollow space of the permanent magnet variable frequency motor and is connected to the output end of the reduction system, forming a transmission system in which the permanent magnet variable frequency motor drives the central pipe to rotate through the reduction system. A wind shielding plate is fixedly arranged at the top of the permanent magnet variable frequency motor, and a cooling fan is fixedly arranged above the wind shielding plate. The cooling fan rotates synchronously with the main shaft of the permanent magnet variable frequency motor.
[0005] As a preferred implementation that can be achieved, a plurality of air outlets are arranged along the circumferential direction at the top of the housing, and a plurality of air inlets are arranged along the circumferential direction in the middle of the housing; when the permanent magnet variable frequency motor is operating, a low-pressure area is formed in the lower region of the wind shielding plate, and a high-pressure area is formed in the upper region of the wind shielding plate inside the housing.
[0006] As a preferred implementation that can be achieved, a plurality of strip-shaped heat dissipation ribs are arranged on the outer surface of the permanent magnet variable frequency motor, and ventilation air channels are formed between adjacent heat dissipation ribs.
[0007] As a preferred implementation that can be achieved, the housing includes an outer shell and an inner shell arranged inside the outer shell. An inner stepped surface is arranged below the inner part of the outer shell, and a lower stepped surface that cooperates with the inner stepped surface is arranged on the outer surface of the inner shell. After the inner stepped surface of the outer shell and the lower stepped surface of the inner shell are cooperatively connected, the outer shell bears all axial loads transmitted by the inner shell.
[0008] As a preferred implementation method, a main bearing is sleeved on the central pipe. A protruding plane is fixedly arranged on the circumference of the central pipe. The upper end surface of the main bearing is in contact connection with the lower surface of the protruding plane, and the lower end surface of the main bearing is in contact connection with the upper surface of the inner shell.
[0009] As a preferred implementation method, a special petroleum thread joint is arranged at the lower end of the central pipe, and the special petroleum thread joint is connected to the downhole drill tool.
[0010] As a preferred implementation method, it further includes an anti-torque release device. The anti-torque release device includes a frequency converter, a braking resistor, and a braking switch. The permanent magnet variable frequency motor is connected to the frequency converter. The frequency converter is used to supply electric energy to the permanent magnet variable frequency motor. The output end of the frequency converter is also connected to the braking resistor through the braking switch to form a braking circuit.
[0011] Beneficial effects: The power swivel driven by the permanent magnet variable frequency motor provided by the present invention has the characteristics of novel structure, reliable performance, and convenient control. It solves the problems that the traditional hydraulically driven power swivel may pollute the environment and has complex control. The power source of this structure is convenient, cost-saving, and can release the anti-torque formed by torsion during the rotation of drill tools up to several kilometers as needed. Description of the Drawings
[0012] Figure 1 It is a schematic structural diagram of a workover power swivel driven by a permanent magnet variable frequency motor of the present invention;
[0013] Figure 2 It is a schematic diagram of the anti-torque release device of a workover power swivel driven by a permanent magnet variable frequency motor of the present invention. Detailed Implementation Modes
[0014] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following describes the detailed implementation modes of the present invention with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.
[0015] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation mode.
[0016] As Figure 1-2 shown, the utility model provides a workover power swivel driven by a permanent magnet variable frequency motor, which includes a housing, a central pipe 1, a cooling fan 5, a top cover 16, a wind baffle 4, a permanent magnet variable frequency motor 2, a reduction system 3, a main bearing 10, as well as a frequency converter 13, a braking resistor 15, and a braking switch 14.
[0017] The central pipe 1, the permanent magnet variable frequency motor 2, and the reduction system 3 are arranged inside the housing. The permanent magnet variable frequency motor 2 is of a hollow structure. The output end of the permanent magnet variable frequency motor 2 is connected to the reduction system and serves as the input end of the reduction system. The central pipe 1 passes through the hollow space of the permanent magnet variable frequency motor 2 and is connected to the output end of the reduction system, forming a transmission system in which the permanent magnet variable frequency motor 2 drives the central pipe 1 to rotate through the reduction system 3. A wind baffle 4 is fixedly arranged on the top of the permanent magnet variable frequency motor 2, and a cooling fan 5 is fixedly arranged on the upper part of the wind baffle 4. The cooling fan 5 rotates synchronously with the main shaft of the permanent magnet variable frequency motor 2.
[0018] The permanent magnet variable frequency motor 2 is connected to the frequency converter 13. The frequency converter 13 is used to supply electric energy to the permanent magnet variable frequency motor 2. The output end of the frequency converter 13 is also connected to the braking resistor 15 through the braking switch 14 to form a braking circuit.
[0019] It should be noted that during use, the frequency converter 13 gives corresponding frequency and voltage according to the working needs. The permanent magnet variable frequency motor 5 works under the frequency and voltage given by the frequency converter 13. After the speed reduction and torque increase transformation of the reduction system 3, the rotation speed and torque required for workover are finally output by the central pipe 1. Moreover, by changing the output parameters of the frequency converter 13, the purpose of changing the rotation direction, rotation speed, and torque of the central pipe is achieved.
[0020] The housing comprises an outer shell 8 and an inner shell 9 disposed within the outer shell. An inner stepped surface 81 is disposed at the lower portion of the outer shell 8, and a lower stepped surface 91 is disposed on the outer surface of the inner shell 9 to mate with the inner stepped surface. The inner stepped surface 81 of the outer shell 8 and the lower stepped surface 91 of the inner shell 9 mate to each other, allowing the outer shell 8 to bear all axial loads transmitted by the inner shell 9. It should be noted that a top cover 16 is disposed on the top of the outer shell 8, forming a relatively enclosed cage-shaped space. The permanent magnet variable frequency motor 2 is fixedly connected to the top cover 16 of the inner shell 9 via a flange. A main bearing 10 is sleeved on the center tube 1. A protruding flat surface 12 is fixedly disposed along the circumference of the center tube 1. The upper end surface of the main bearing 10 contacts the lower surface of the protruding flat surface 12, and the lower end surface of the main bearing 10 contacts the upper surface of the inner shell 9. A special oil-specific threaded joint is provided at the lower end of the center tube 1, which is threadedly connected to the drilling tool in the well. The central portion of the center tube of the present application is provided with a protruding surface along its circumference. The protruding surface is in contact with the main bearing, which is supported on the inner surface of the inner shell. As a result, the above structure allows the weight of the drilling tool in the well to pass through the central tube, the main bearing, and the inner shell, and further transfer the weight of the entire drilling tool to the outer shell.
[0021] like Figure 1 As shown, the upper end of the housing is provided with multiple air outlets 6 along its circumference, and the middle portion of the housing is provided with multiple air intakes 7 along its circumference. During operation, the lower area of the wind baffle 4 forms a low-pressure zone, while the upper area of the wind baffle 4 within the housing forms a high-pressure zone. The outer surface of the permanent magnet variable-frequency motor 2 is provided with several strip-shaped heat dissipation ribs 21, with ventilation ducts formed between adjacent heat dissipation ribs 21. It should be noted that when in use, cooling fan 5 rotates along with the main shaft of permanent magnet variable frequency motor 2. The rotation of cooling fan 5's blades creates a centrifugal effect, creating a low-pressure area below air baffle 4 inside housing 8. Air outside housing 8 enters housing 8 through air intake 7, flows upward along the ventilation duct on the outer surface of permanent magnet variable frequency motor 2, and removes heat from the ventilation duct formed by the strip-shaped heat dissipation ribs on the outer surface of permanent magnet variable frequency motor 2. The airflow then enters the upper part of air baffle 4, enters the high-pressure area, and is discharged through air outlet 6 on the upper part of housing 8, achieving the effect of forced cooling of the motor surface and removing heat from the permanent magnet variable frequency motor.
[0022] It should be noted that since the downhole drill string is several kilometers long, such a long drill string will form a "twisted shape" due to its own flexibility under the action of the torque output by the central pipe, the wellbore wall resistance, and the bit reaction torque. When the downhole drill string is lifted, due to the disappearance of the bit torque and the gradual reduction of the wellbore wall resistance, the "twisted" drill string will rotate in the reverse direction and drive the central pipe 1 to rotate in the reverse direction. If this reverse rotation torque cannot be gradually and slowly released, it will cause the drill string to rotate rapidly in the reverse direction, leading to dangerous situations. The present application provides an anti-torque release device, which includes a frequency converter 13, a braking resistor 15, and a braking switch 14. The permanent magnet variable frequency motor 2 is connected to the frequency converter 13. The frequency converter 13 is used to supply electrical energy to the permanent magnet variable frequency motor 2. The output end of the frequency converter 13 is also connected to the braking resistor 15 through the braking switch 14 to form a braking circuit. As shown in the figure, while switching the control command of the frequency converter 13, the switch 14 is closed to conduct the control circuit of the braking resistor 15, so that the three-phase windings of the permanent magnet variable frequency motor 2 are directly short-circuited. When the permanent magnet variable frequency motor is dragged by the "twisted" drill string in the well to rotate in the reverse direction, it enters the power generation state, and the electricity generated by it is directly consumed through the braking resistor 14, thereby causing the permanent magnet variable frequency motor to generate a load torque to prevent the rotor speed of the permanent magnet variable frequency motor from further increasing until the rotor stops rotating, thus releasing the anti-torque of the downhole drill string and avoiding accidents such as running away. On the other hand, due to the risk of sudden power failure of the power supply, in the case of sudden power failure or abnormal power supply, even if the frequency converter 13 loses control in this structure, this stress release system can safely release the drill pipe anti-torque and achieve safe parking. Usage instructions: When the swivel needs to stop rotating and the central pipe 1 is kept braked, only need to give the control command to the frequency converter 13 to make the frequency converter output the working parameters of 0HZ / high voltage, then the permanent magnet variable frequency motor 2 can work in the large torque hover state; when the central pipe 1 of the swivel needs to float freely, only need to cut off the control command of the frequency converter 13, then the permanent magnet variable frequency motor 2 can float freely, and the corresponding central pipe will be in the floating state.
[0023] Therefore, the workover power swivel driven by the permanent magnet variable frequency motor of the present application has the following beneficial effects: 1) It is driven by a permanent magnet variable frequency motor and uses clean energy as the power source, solving the problem of possible environmental pollution caused by hydraulic motor drive; 2) The operation of the motor is controlled by a frequency converter, which has the characteristics of high energy utilization rate, energy saving, and convenient control; 3) The permanent magnet variable frequency motor and the reduction system are protected by the housing, improving the protection level of the transmission system; 4) The permanent magnet variable frequency motor is self-equipped with forced air cooling, improving the cooling effect of the swivel; 5) The zero-speed braking of the motor is controlled by a frequency converter and combined with a braking resistor, and the braking and anti-torque release of the swivel can be controlled at any time as needed.
[0024] The above description is only the preferred mode of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can be made, which should also be regarded as within the protection scope of the present utility model.
Claims
1. A workover power swivel driven by a permanent magnet variable frequency motor, characterized in that It includes a housing, inside which a central pipe (1), a permanent magnet variable frequency motor (2) and a reduction system (3) are arranged. The permanent magnet variable frequency motor (2) is of a hollow structure. The output end of the permanent magnet variable frequency motor (2) is connected to the reduction system and serves as the input end of the reduction system. The central pipe (1) passes through the hollow space of the permanent magnet variable frequency motor (2) and is connected to the output end of the reduction system, forming a transmission system in which the permanent magnet variable frequency motor (2) drives the central pipe (1) to rotate through the reduction system (3).
2. The workover power swivel driven by a permanent magnet variable frequency motor according to claim 1, wherein A number of strip-shaped heat dissipation ribs (21) are arranged on the outer surface of the permanent magnet variable frequency motor (2), and ventilation air channels are formed between adjacent heat dissipation ribs (21).
3. A workover power swivel driven by a permanent magnet variable frequency motor according to claim 1, characterized in that, The housing includes an outer shell (8) and an inner shell (9) arranged inside the outer shell. An inner step surface (81) is arranged below the inside of the outer shell (8). A lower step surface (91) that mates with the inner step surface is arranged on the outer surface of the inner shell (9). After the inner step surface (81) of the outer shell and the lower step surface (91) of the inner shell are cooperatively connected, the outer shell (8) bears all axial loads transmitted by the inner shell (9).
4. A workover power swivel driven by a permanent magnet variable frequency motor according to claim 3, characterized in that, A main bearing (10) is sleeved on the central pipe (1). A protruding plane (12) is fixedly arranged on the circumference of the central pipe (1). The upper end surface of the main bearing (10) is in contact connection with the lower surface of the protruding plane (12), and the lower end surface of the main bearing (10) is in contact connection with the upper surface of the inner shell (9).
5. A workover power swivel driven by a permanent magnet variable frequency motor according to claim 1, characterized in that, A special petroleum thread joint is arranged at the lower end of the central pipe (1), and the special petroleum thread joint is connected to the downhole drill tool.
6. A workover power swivel driven by a permanent magnet variable frequency motor according to claim 1, characterized in that, It also includes an anti-torque release device. The anti-torque release device includes an inverter (13), a braking resistor (15) and a braking switch (14). The permanent magnet variable frequency motor (2) is connected to the inverter (13). The inverter (13) is used to supply electric energy to the permanent magnet variable frequency motor (2). The output end of the inverter (13) is also connected to the braking resistor (15) through the braking switch (14) to form a braking circuit.