Underground power generation device for producing well

Abstract

The invention discloses a producing well underground power generation device which comprises a shell, a power generation body and a rack rod, the rack rod is arranged in an inner channel of the power generation body and used for being connected with a sucker rod of a producing well underground oil extraction device, and the inner channel is a liquid passing channel; the power generation body comprises a first gear set, a magnetic coupling, a second gear set, a third gear set and a power generation assembly, and the third gear set is a planetary gear set; the first gear set is used for converting linear motion of the rack rod into reciprocating rotation of the magnetic coupling outer ring, and the second gear set is used for converting reciprocating rotation of the magnetic coupling inner ring into unidirectional rotation of a planet carrier of the planetary gear set, so that the linear motion is converted into electric energy through the power generation assembly after accelerated transmission of the planetary gear set; the magnetic coupling further comprises an isolation sleeve arranged between the outer ring and the inner ring, so that a sealed cavity is defined by the isolation sleeve, the inner wall of the shell at the lower end of the isolation sleeve and the outer wall of the inner channel. The power generation device can generate power through vertical movement of the sucker rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole engineering, in particular to a downhole power generation device for oil production wells. BACKGROUND

[0002] In oil production operations, stable operation and efficient oil production of oil production wells are the core goals. Currently, the downhole equipment of oil production wells in oilfields faces many challenges, among which the power supply problem is particularly prominent. The existing downhole equipment of oil production wells, such as downhole monitoring sensors, communication equipment, etc., has a high demand for power supply. However, the traditional power supply method has many drawbacks. For example, using long-distance power transmission not only requires laying a long power transmission line, resulting in high construction cost, but also has large energy loss during power transmission, reducing energy utilization efficiency. On the other hand, the operation speed will also be affected in the downhole operation of the line, and there is a risk of cable extrusion damage.

[0003] In summary, it is of great practical significance to develop a high-efficiency, stable, environmentally friendly and low-cost downhole power generation device for oil production wells, which not only solves the shortcomings of the existing power supply method and improves the production efficiency and safety of oil production wells, but also helps to promote the sustainable development of the oilfield industry. SUMMARY

[0004] In order to realize downhole power generation of oil production wells, the present application provides a downhole power generation device for oil production wells, which can generate electricity by the up and down movement of the sucker rod.

[0005] As an aspect of the present application, the present application provides a downhole power generation device for oil production wells, comprising a shell, a power generation main body and a rack rod, the rack rod is arranged in the inner channel of the power generation main body and is used to connect with the sucker rod of the downhole oil production device of the oil production well, and the inner channel is a liquid passage;

[0006] The power generation main body comprises a first gear set, a magnetic coupling shaft, a second gear set, a third gear set and a power generation assembly, and the third gear set is a planetary gear set;

[0007] The first gear set is used to convert the reciprocating linear motion of the rack rod into the reciprocating rotation of the outer ring of the magnetic coupling shaft, and the second gear set is used to convert the reciprocating rotation of the inner ring of the magnetic coupling shaft into the one-way rotation of the planetary carrier of the third gear set, so that the electric energy is converted by the power generation assembly after the acceleration transmission of the third gear set;

[0008] The magnetic coupling shaft further comprises an isolation sleeve arranged between the outer ring and the inner ring, so that the isolation sleeve, the inner wall of the shell at its lower end and the outer wall of the inner channel form a sealed cavity.

[0009] Optionally, the first gear set comprises:

[0010] A first gear meshing with the rack and pinion, a second gear coaxial with the first gear, a third gear meshing with the second gear, a fourth gear coaxial with the third gear, and a fifth gear meshing with the fourth gear;

[0011] The fifth gear is coaxial with and connected to the outer ring of the magnetic coupling.

[0012] The second gear and the third gear are bevel gears.

[0013] Optionally, the first gear set has a total of three sets of the first gear, the second gear, the third gear and the fourth gear, which are deployed circumferentially.

[0014] Optionally, the second gear set includes:

[0015] The sixth gear is connected to and coaxial with the inner ring of the magnetic coupling; the seventh gear meshes with the sixth gear; the eighth gear is coaxial with the seventh gear; the ninth gear meshes with the eighth gear; the tenth gear meshes with the sixth gear; the eleventh gear meshes with the tenth gear; and the twelfth gear is coaxial with the eleventh gear.

[0016] The twelfth gear meshes with the ninth gear;

[0017] The shaft of the ninth gear is connected to the planet carrier of the third gear set;

[0018] The shafts of the seventh and eighth gears, and the shafts of the eleventh and twelfth gears, are all unidirectional transmission shafts, and their transmission directions are consistent.

[0019] Optionally, the second gear set has a total of 3 sets of the seventh, eighth, tenth, eleventh and twelfth gears, which are arranged circumferentially.

[0020] Optionally, the third gear set further includes a plurality of planetary gears circumferentially distributed on the planet carrier, which mesh with internal gears on the inner wall of the housing and simultaneously with the output gear.

[0021] Optionally, a fourth gear set may also be included, which is a planetary gear set, and the output gear of the third gear set also serves as the input gear of the fourth gear set.

[0022] The fourth gear set is used to accelerate the rotation of its input gear and transmit the power to the power generation component.

[0023] Optionally, the power generation assembly includes a generator rotor and a generator stator;

[0024] The generator rotor is equipped with a permanent magnet, and the generator stator is equipped with an induction coil.

[0025] Optionally, the power generation component may also be equipped with a capacitor or an overrunning clutch.

[0026] Optionally, the inner wall of the inner channel is provided with multiple rack and pinion guides along the axial direction.

[0027] Optionally, the two ends of the power generation body are respectively provided with an upper connector and a lower connector.

[0028] Optionally, the upper connector is used to connect to the pump barrel of the plunger pump of the downhole oil production device of the oil well, and the lower connector is used to connect to the static valve of the downhole oil production device of the oil well.

[0029] Optionally, the upper connector is used to connect to the lower part of the static valve of the downhole oil production device of the oil well, and the lower connector is used to connect to the tubing or other downhole tools.

[0030] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0031] (1) The downhole power generation device for oil wells provided in this embodiment converts the reciprocating linear motion of the rack and pinion into reciprocating rotary motion through the first gear set, converts the reciprocating rotary motion into unidirectional rotary motion through the second gear set, and then converts the mechanical energy into electrical energy through the power generation component after the speed increase of the third gear set, thus realizing the self-generation of oil wells. Compared with single-stage or fewer-stage gear transmission, multi-stage transmission significantly improves the energy conversion efficiency.

[0032] (2) The downhole power generation device for oil wells provided in the embodiments of the present invention is not practical to seal the entire power generation device because the rack rod is directly connected to the sucker rod. By setting up a magnetic coupling including an isolation sleeve, mechanical energy transmission is realized, and the cavity formed between the isolation sleeve, the inner wall of the outer shell at its lower end and the outer wall of the inner channel is sealed, providing a sealed environment for the power generation components.

[0033] (3) The downhole power generation device for oil wells provided in the embodiments of the present invention has multiple rack rods arranged axially on the inner wall of the inner channel to ensure the linearity and stability of the rack rod movement and reduce energy loss caused by movement deviation.

[0034] (4) The downhole power generation device for oil wells provided in the embodiments of the present invention is further equipped with a capacitor or an overrunning clutch, and achieves stable and smooth output of electrical energy through electrical energy storage or mechanical energy storage.

[0035] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0036] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a cross-sectional view of the downhole power generation device for oil wells provided in an embodiment of the present invention;

[0039] Figure 2 This is a structural diagram of the first gear set provided in an embodiment of the present invention;

[0040] Figure 3 This is a structural diagram of the second gear set provided in an embodiment of the present invention;

[0041] Figure 4 This is a structural diagram of the third and fourth gear sets provided in the embodiments of the present invention. Detailed Implementation

[0042] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The inventors discovered that existing downhole power generation devices are mostly installed in water injection wells, converting the energy generated by the flow of injected fluid into electrical energy. Patent 201611057386.5, "A Downhole Power Generation Device," describes a downhole power generation device installed in a production well. During oil well production, the downhole fluid generates electricity through the power generation device under the action of the oil pump.

[0046] From a technical perspective, generating electricity from production wells using fluid flow is quite difficult, mainly due to the following reasons: 1) Small discharge rate: the average discharge rate of a production well is only 10 cubic meters per day, resulting in very weak flow energy; 2) Discontinuous flow: fluid only moves upwards when the pumping unit moves, requiring frequent start-stop cycles for the power generation turbine, and necessitating short-term energy storage capabilities in the circuitry to ensure continuous power output; 3) Production well fluids contain many impurities, and tools are easily contaminated with oil, affecting long-term operation. Therefore, there is an urgent need to develop downhole power generation devices that utilize other energy sources to generate electricity in production wells.

[0047] The downhole power generation device for oil wells provided in this application uses mechanical energy to generate electricity, which overcomes the above-mentioned shortcomings and has higher reliability and greater power.

[0048] Example

[0049] This application provides a downhole power generation device for oil wells, the structure of which is described below. Figures 1-4 As shown, it includes a housing 1, a power generation unit, and a rack and pinion 2.

[0050] The rack rod 2 is located in the inner channel of the power generation body and is used to connect with the sucker rod of the downhole oil production device in the oil well. The inner channel is a fluid passage.

[0051] The main power generation unit includes a first gear set 3, a magnetic coupling shaft, a second gear set 5, a third gear set 6, and a power generation component 8. The third gear set 6 is a planetary gear set.

[0052] The first gear set 3 is used to convert the linear reciprocating motion of the rack rod 2 into the reciprocating rotation of the outer ring 41 of the magnetic coupling. The second gear set 5 is used to convert the reciprocating rotation of the inner ring 43 of the magnetic coupling into the unidirectional rotation of the planet carrier 61 of the third gear set, so that after the acceleration transmission of the third gear set, it is converted into electrical energy by the power generation component 8.

[0053] The magnetic coupling also includes an isolation sleeve 42 disposed between the outer ring 41 and the inner ring 43, such that the isolation sleeve, the inner wall of the outer shell at its lower end and the outer wall of the inner channel form a sealed cavity.

[0054] Since the rack rod is directly connected to the sucker rod, sealing the entire power generation unit is impractical. By using a magnetic coupling that includes an isolation sleeve, mechanical energy transmission is achieved, and the cavity formed by the isolation sleeve, the inner wall of the outer shell at its lower end, and the outer wall of the inner channel is sealed, providing a sealed environment for the power generation components.

[0055] The downhole power generation device for oil wells provided in this invention converts the reciprocating linear motion of the rack and pinion into reciprocating rotary motion via the first gear set, the reciprocating rotary motion into unidirectional rotary motion via the second gear set, and then the mechanical energy is converted into electrical energy by the power generation component after being accelerated by the third gear set, thus realizing self-generation of oil wells. Compared with single-stage or fewer-stage gear transmission, multi-stage transmission significantly improves energy conversion efficiency.

[0056] In some embodiments, see Figure 2 As shown, the first gear set 3 converts the reciprocating linear motion of the rack rod 2 into the reciprocating rotation of the outer ring 41 of the magnetic coupling through a combination of 5 gears.

[0057] Specifically, the first gear set 3 includes:

[0058] The first gear 31 meshes with the rack 2 and is a spur gear.

[0059] The second gear 32 is coaxial with the first gear 31 and is a bevel gear;

[0060] The third gear 33 meshes with the second gear 32 and is a bevel gear;

[0061] The fourth gear 34 is coaxial with the third gear 33 and is a spur gear;

[0062] The fifth gear 35 meshes with the fourth gear 34 and is coaxial with and connected to the outer ring 41 of the magnetic coupling.

[0063] In some embodiments, the first gear set 3 comprises three sets of gears: the first gear 31, the second gear 32, the third gear 33, and the fourth gear 34, arranged circumferentially. This enhances torque and prevents a single drive chain from bearing excessive force and wear.

[0064] In some embodiments, the number of teeth of each gear in the first gear set 3 may be set as follows: first gear 31, 17 teeth; second gear 32, 28 teeth; third gear 33, 16 teeth; fourth gear 34, 17 teeth; and fifth gear 35, 63 teeth.

[0065] In some embodiments, seeFigure 3 As shown, the second gear set 5 includes:

[0066] The sixth gear 51 is connected to and coaxial with the inner ring 43 of the magnetic coupling;

[0067] The seventh gear 52 meshes with the sixth gear 51;

[0068] The eighth gear 53 is coaxial with the seventh gear 52;

[0069] The ninth gear 54 meshes with the eighth gear 53, and the shaft of the ninth gear 54 is connected to the planet carrier 61 of the third gear set 6.

[0070] The tenth gear 55 meshes with the sixth gear 51;

[0071] Eleventh gear 56 meshes with tenth gear 55;

[0072] The twelfth gear 57 is coaxial with the eleventh gear 56 and meshes with the ninth gear 54.

[0073] The shafts of the seventh gear 52 and the eighth gear 53, and the shafts of the eleventh gear 56 and the twelfth gear 57 are all unidirectional transmission shafts, and their transmission directions are the same.

[0074] As can be seen from the above, the second gear set 5 contains two transmission chains, both of which start from the sixth gear 51 and end at the ninth gear 54.

[0075] The first transmission chain: sixth gear 51 → seventh gear 52 → eighth gear 53 → ninth gear 54. The one-way shaft setting means that this transmission chain can only transmit the rotational motion of the ninth gear 54 in a certain direction.

[0076] The second transmission chain: sixth gear 51tenth gear 55eleventh gear 56twelfth gear 57ninth gear 54. The unidirectional shaft orientation ensures that this transmission chain can only transmit the rotational motion of the ninth gear 54 in a certain direction.

[0077] Since the second transmission chain has one more gear than the first group, the first and second transmission chains transmit input motions in opposite directions, and the ninth gear 54 rotates in the same direction. That is, the reciprocating rotation of the sixth gear 51 is converted into the unidirectional rotation of the ninth gear 54, thus achieving the direction of rotation.

[0078] In some embodiments, the second gear set 5 has three sets of gears: the seventh gear 52, the eighth gear 53, the tenth gear 55, the eleventh gear 56, and the twelfth gear 57, arranged circumferentially. This can reduce the torque borne by each set of gears or increase the total transmitted torque.

[0079] In some embodiments, the number of teeth of each gear in the second gear set 5 may be set as follows: the sixth gear 51 and the ninth gear 54 may each have 60 teeth; the seventh gear 52, the eighth gear 53, the tenth gear 55, the eleventh gear 56 and the twelfth gear 57 may each have 17 teeth.

[0080] In some embodiments, see Figure 4 As shown, the third gear set 6 also includes a plurality of planetary gears 62 circumferentially distributed on the planet carrier 61. The planetary gears 62 mesh with the internal gears on the inner wall of the outer casing 1 and at the same time mesh with the output gear 63.

[0081] Each set of planetary gears can have 6 evenly distributed around the circumference. In terms of the number of teeth, the planetary gears can have 18 teeth, and the gears inside the outer casing can have 96 teeth.

[0082] Furthermore, a fourth gear set 7 can be added based on the third gear set 6. The fourth gear set 7 is also a planetary gear set, and the output gear of the third gear set 6 also serves as the input gear of the fourth gear set 7, coaxial with and connected to the planet carrier of the fourth gear set 7. The fourth gear set 7 is used to accelerate the rotation of its input gear and transmit it to the power generation component.

[0083] The purpose of increasing the speed is to increase the rotational speed and reduce the size of the generator; however, the rotational speed cannot be too high, as this will increase the vibration of the generator and accelerate the wear of bearings and gears. Therefore, more stages are not necessarily better; the appropriate final rotational speed should be achieved based on the speed of the rack and pinion movement.

[0084] In this embodiment, the four sets of gears are rationally arranged within the frame of the power generation unit, resulting in a compact overall structure that occupies little space. This makes it easy to install in various linear reciprocating motion equipment or scenarios, and it has broad application prospects.

[0085] In some embodiments, the power generation component 8 employs the conventional electromagnetic induction power generation principle, including a generator rotor and a generator stator. A permanent magnet is mounted on the generator rotor, and an induction coil is arranged on the generator stator. When the rotor rotates, the magnetic field between the stator and rotor changes. According to the law of electromagnetic induction, an induced electromotive force is generated in the induction coil of the stator. If a load is connected to the induction coil to form a closed loop, a current will be generated, thus realizing the process of converting mechanical energy into electrical energy.

[0086] The inner channel of the power generation unit also serves as a production channel, where liquid flows. Therefore, a large gap needs to be maintained between the rack and the inner channel to allow for low-resistance liquid flow. Simultaneously, to ensure good meshing between the rack and gear, their radial movement needs to be appropriately restricted. Therefore, in some embodiments, multiple rack guides are axially arranged on the inner wall of the inner channel of the power generation unit to ensure the linearity and stability of the rack's movement and reduce energy loss due to movement deviations.

[0087] Even after commutation and speed-up, the rotational speed curve of mechanical rotation remains volatile, causing discontinuities in power generation. This can be addressed through electrical or mechanical energy storage.

[0088] 1) Electrical energy storage. Energy is stored using energy storage components such as capacitors at high speeds and released when power is insufficient at low speeds, making the entire output continuous and smooth.

[0089] 2) Mechanical energy storage. The flywheel is driven by an overrunning clutch. At high speed, the flywheel's inertia stores the mechanical energy of rotation. At low speed, the clutch overruns and slips, and the flywheel drives the generator to output power. Similar to the function of electrical energy storage, this makes the output continuous and smooth.

[0090] In summary, by incorporating capacitors or overrunning clutches into power generation components, stable and smooth power output can be achieved through electrical or mechanical energy storage.

[0091] To reduce friction on the rotating shafts of each gear set, improve transmission efficiency, and enhance the stability and service life of the entire transmission system, bearings can be installed at both ends of the rotating shafts of each gear set, with the bearings housed in bearing housings. See also... Figure 1 As shown, a first bearing 9, a second bearing 10, a third bearing 11, a fourth bearing 12, and a fifth bearing 13 are provided.

[0092] The following describes the installation location of the power generation device. The main power generation unit has an upper connector and a lower connector at each end. Depending on the installation location, the objects connected to the upper and lower connectors differ:

[0093] (1) The power generation device is located between the pump cylinder and the static valve.

[0094] The upper connector is used to connect to the pump barrel of the plunger pump in the downhole oil production unit of the oil well, and the lower connector is used to connect to the static valve of the downhole oil production unit of the oil well.

[0095] The advantage of this method is that the moving part that drives the generator—the rack and pinion—is directly connected to the lower part of the plunger in the plunger pump, directly entering the generator, without requiring any changes to the pump body structure. The disadvantage is that the increased space above the stationary valve may affect pump efficiency.

[0096] (2) The power generation device is located below the static valve.

[0097] The upper connector is used to connect to the lower part of the static valve of the downhole oil production equipment in the oil well, and the lower connector is used to connect to the tubing or other downhole tools.

[0098] In contrast to (1), the advantage of method (2) is that the space above the static valve remains unchanged, which does not affect the pump efficiency. The disadvantage is that the moving parts need to pass through the upper part of the static valve to the lower part and then connect to the rack and pinion to enter the power generation tool, which requires customization of the static valve structure.

[0099] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A downhole power generation device for oil wells, characterized in that, It includes a shell, a power generation body, and a rack and pinion rod. The rack and pinion rod is disposed in the inner channel of the power generation body and is used to connect with the sucker rod of the downhole oil production device of the oil well. The inner channel is a fluid passage. The power generation unit includes a first gear set, a magnetic coupling, a second gear set, a third gear set, and a power generation component, wherein the third gear set is a planetary gear set; The first gear set is used to convert the reciprocating linear motion of the rack rod into the reciprocating rotation of the outer ring of the magnetic coupling. The second gear set is used to convert the reciprocating rotation of the inner ring of the magnetic coupling into the unidirectional rotation of the planetary carrier of the third gear set, so that after being accelerated and transmitted by the third gear set, it is converted into electrical energy by the power generation component. The magnetic coupling also includes an isolation sleeve disposed between the outer ring and the inner ring, such that the isolation sleeve, the inner wall of the outer shell at its lower end, and the outer wall of the inner channel form a sealed cavity.

2. The downhole power generation device for oil wells as described in claim 1, characterized in that, The first gear set includes: A first gear meshing with the rack and pinion, a second gear coaxial with the first gear, a third gear meshing with the second gear, a fourth gear coaxial with the third gear, and a fifth gear meshing with the fourth gear; The fifth gear is coaxial with and connected to the outer ring of the magnetic coupling. The second gear and the third gear are bevel gears.

3. The downhole power generation device for oil wells as described in claim 2, characterized in that, The first gear set consists of three sets of gears: the first gear, the second gear, the third gear, and the fourth gear, arranged circumferentially.

4. The downhole power generation device for oil wells as described in claim 1, characterized in that, The second gear set includes: The sixth gear is connected to and coaxial with the inner ring of the magnetic coupling; the seventh gear meshes with the sixth gear; the eighth gear is coaxial with the seventh gear; the ninth gear meshes with the eighth gear; the tenth gear meshes with the sixth gear; the eleventh gear meshes with the tenth gear; and the twelfth gear is coaxial with the eleventh gear. The twelfth gear meshes with the ninth gear; The shaft of the ninth gear is connected to the planet carrier of the third gear set; The shafts of the seventh and eighth gears, and the shafts of the eleventh and twelfth gears, are all unidirectional transmission shafts, and their transmission directions are consistent.

5. The downhole power generation device for oil wells as described in claim 4, characterized in that, The second gear set has a total of 3 sets of the seventh, eighth, tenth, eleventh and twelfth gears, which are arranged circumferentially.

6. The downhole power generation device for oil wells as described in claim 1, characterized in that, The third gear set also includes a plurality of planetary gears circumferentially distributed on the planet carrier. The planetary gears mesh with the internal gears on the inner wall of the housing and simultaneously mesh with the output gear.

7. The downhole power generation device for oil wells as described in claim 6, characterized in that, It also includes a fourth gear set, which is a planetary gear set, and the output gear of the third gear set also serves as the input gear of the fourth gear set. The fourth gear set is used to accelerate the rotation of its input gear and transmit the power to the power generation component.

8. The downhole power generation device for oil wells as described in claim 1, characterized in that, The power generation assembly includes a generator rotor and a generator stator; The generator rotor is equipped with a permanent magnet, and the generator stator is equipped with an induction coil.

9. The downhole power generation device for oil wells as described in claim 1, characterized in that, The power generation component is also equipped with a capacitor or an overrunning clutch.

10. The downhole power generation device for oil wells as described in claim 1, characterized in that, The inner wall of the inner channel is provided with multiple rack and pinion guides along the axial direction.

11. The downhole power generation device for oil wells as described in claim 1, characterized in that, The power generation body is equipped with an upper connector and a lower connector at both ends.

12. The downhole power generation device for oil wells as described in claim 11, characterized in that, The upper connector is used to connect to the pump barrel of the plunger pump of the downhole oil production device in the oil well, and the lower connector is used to connect to the static valve of the downhole oil production device in the oil well.

13. The downhole power generation device for oil wells as described in claim 11, characterized in that, The upper connector is used to connect to the lower part of the static valve of the downhole oil production device in the oil well, and the lower connector is used to connect to the tubing or other downhole tools.

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