An oil production device suitable for small wellbore electric heating and monitoring

Abstract

The present invention relates to the technical field of oil extraction equipment, and provides an oil production device suitable for small wellbore electric heating and monitoring, including: a Christmas tree, an outer pipe is provided at the bottom of the Christmas tree, an inner pipe is provided inside the outer pipe, an electric heating component is provided inside the inner pipe, and a flow monitoring component is provided inside the outer pipe; through the linkage of components such as the second rotating shaft, universal joint, limit disc one and limit disc two, the present invention realizes the dynamic adjustment of the heating power and range of the telescopic heating plate during the oil production process. When the flow rate increases, the slider slides under the action of centrifugal force, and drives the telescopic heating plate to expand the heating range and increase the heating power through transmission mechanisms such as connecting rods to adapt to the change of crude oil flow rate; when the oil production speed slows down, the spring resets, the limit disc two separates, and the telescopic heating plate is restored to the initial state through components such as torsion springs and limit rods two. The device can adjust the heating state in real time according to the oil production speed and crude oil flow rate, realizes automatic control, and enhances the adaptability and flexibility of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction equipment, and particularly to an oil production device suitable for small wellbore electric heating and monitoring. Background Art

[0002] With the continuous growth of global energy demand and the increasing depletion of conventional reservoir resources, the oil extraction industry is gradually expanding into complex geological condition fields such as low-permeability reservoirs, heavy oil reservoirs, and marginal reservoirs. These reservoirs generally have problems such as high crude oil viscosity, poor fluidity, and strong reservoir heterogeneity, resulting in difficult efficient development of traditional oil production technologies; in particular, how to achieve accurate flow monitoring, efficient crude oil heating, and dynamic oil production control under small wellbore conditions has become the core issue for improving oilfield development efficiency and economic benefits.

[0003] Small wellbore technology has gradually become popular in the development of low-permeability and heavy oil reservoirs due to advantages such as low drilling cost, environmental friendliness, and adaptability to complex well types. Some technologies attempt to indirectly calculate the flow rate on the ground, but they cannot reflect the downhole dynamic changes in real time. In addition, traditional heavy oil extraction relies on electric heating technology to reduce the viscosity of crude oil, but existing electric heating systems mostly adopt fixed power or simple temperature control modes, and cannot dynamically adjust the heating intensity according to the real-time flow rate. Especially when the oil production rate changes suddenly, it cannot match the change in the heat demand of crude oil caused by the flow rate fluctuation; for example, in the rapid oil production stage, high-flow-rate crude oil needs short-term high-intensity heating to maintain the target temperature, but fixed power is likely to cause insufficient heating; on the contrary, overheating and coking may occur at low flow rates. Summary of the Invention

[0004] The present invention provides an oil production device suitable for small wellbore electric heating and monitoring. By driving the rotation of the second rotating shaft by a motor, it not only realizes the accurate flow measurement of the conjugate rotor for the wellbore liquid, but also drives the synchronous operation of three groups of flow meters to ensure the same flow rate in each through groove, improving the efficiency and accuracy of oil production operations; also, through the engagement of the electric telescopic rod and the rotating rod, the adjustment of the heating power and range of the telescopic heating plate is realized. During normal oil production, the telescopic heating plate maintains its initial state, saving energy and reducing wear, providing an efficient, energy-saving, and reliable solution for oil extraction to solve the problems raised in the background art.

[0005] The technical solution of the present invention is as follows:

[0006] An oil production device suitable for small wellbore electric heating and monitoring, comprising: a Christmas tree, a outer pipe is provided at the bottom of the Christmas tree, an inner pipe is provided inside the outer pipe, an electric heating component is provided inside the inner pipe, and a flow rate monitoring component is provided inside the outer pipe;

[0007] The electric heating component includes a telescopic heating plate, which is fixedly connected inside the outer tube. Rack bars are fixedly connected to both ends of the telescopic heating plate. A gear is arranged in the middle of the two rack bars, and the gear meshes with the rack bars. When the gear rotates, the telescopic heating plate is driven to move synchronously through the rack bars, realizing dynamic adjustment of the heating range. A rotating rod is fixedly connected to the side of the gear away from the telescopic heating plate;

[0008] The flow rate monitoring component includes a fixed block, which is fixedly connected between the outer tube and the inner tube. The inside of the fixed block is hollow, providing an installation space for the flowmeter and protecting the flowmeter from the harsh environment in the wellbore. Four first through grooves are evenly distributed on the fixed block, and a flowmeter is arranged in the first through grooves.

[0009] Further, a first circular groove is opened inside the outer tube, and an annular groove is opened inside the first circular groove. Both ends of the telescopic heating plate are fixedly connected to the inner walls on both sides of the annular groove, and the rotating rod is rotatably connected to the first circular groove.

[0010] Further, a first limiting rod is fixedly connected to the side of one of the rack bars away from the gear. A disc is rotatably connected to the side of the rack bar in the annular groove. A second limiting rod is fixedly connected to the disc. A plurality of the second limiting rods are distributed in a semi-circular shape on the disc. The other side of the disc is connected to the inner wall of the annular groove through a torsion spring. When the disc rotates, the torsion spring will be stretched or compressed, thereby storing energy. This stored energy is released when needed to drive the disc and the second limiting rods to rotate in the reverse direction, thereby realizing automatic reset of the telescopic heating plate, improving the automation degree and stability of the oil production system. A convex block is fixedly connected between the second limiting rods in the annular groove. The convex block is arc-shaped, but there is no convex block between the second limiting rods at the upper half of the top.

[0011] Further, the flowmeter includes control ends fixedly connected to both sides of the flowmeter. The control ends are located on both sides of the flowmeter and are inside the hollow part of the fixed block and between the two first through grooves. A conjugate rotor is rotatably connected in the first through groove.

[0012] Further, two conjugate rotors are provided in total. The two conjugate rotors engage with each other. When the two conjugate rotors rotate, they can continuously divide the measured petroleum into known single volume parts. A second rotating shaft penetrates through the middle of both of the two conjugate rotors, and one end of each of the two conjugate rotors extends out of the housing of the control end.

[0013] Further, one end of the second rotating shaft on one of the conjugate rotors is fixedly connected to a first bevel gear. A second bevel gear is arranged on one side of the first bevel gear. The first bevel gear meshes with the second bevel gear, and the second bevel gear is fixedly connected to the second rotating shaft in the other flowmeter.

[0014] Further, one end of the second rotating shaft not connected to the first bevel gear is fixedly connected to a universal joint. One end of the universal joint away from the second rotating shaft is fixedly connected to a first limiting disc. Four second through grooves are evenly distributed and formed in the first limiting disc. Sliders are slidably connected in the second through grooves.

[0015] A second limiting disc is slidably connected to the rotating rod. A connecting rod is rotatably connected between the second limiting disc and the slider, and a spring is fixedly connected between the first limiting disc and the second limiting disc.

[0016] Further, a third through groove having the same size as the rotating rod is formed in the middle of the second limiting disc. A third circular groove is formed in the second limiting disc on one side of the second through groove. A plurality of first limiting blocks are fixedly connected in the third circular groove.

[0017] A plurality of second limiting blocks are fixedly connected to one end of the rotating rod away from the gear. Both the first limiting blocks and the second limiting blocks are elliptical.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention heats the liquid in the well through the telescopic heating plate. The liquid passes through the first through groove to drive the conjugate rotors to rotate. The conjugate rotors that engage with each other continuously divide the liquid into single volume parts. The rotation of the conjugate rotors drives the transmission of the first bevel gear and the second bevel gear, driving multiple flowmeters to operate synchronously. This design realizes the continuous metering of the liquid in the oil production process, ensures that the flow rate in each first through groove is the same, improves the accuracy and synchronism of the flow rate measurement, provides accurate flow rate data support for the oil production operation, and enhances the working efficiency and the reliability of the operation.

[0020] 2. The present invention realizes the dynamic adjustment of the heating power and range of the telescopic heating plate in the oil production process through the linkage of components such as the second rotating shaft, the universal joint, the first limiting disc, and the second limiting disc. When the flow rate increases, the slider slides under the action of centrifugal force, and drives the telescopic heating plate to expand the heating range and increase the heating power through a transmission mechanism such as a connecting rod to adapt to the change of the crude oil flow rate.

[0021] When the oil production rate slows down, the spring resets, the first limit disc and the second limit disc separate, and the telescopic heating plate is restored to its initial state through components such as the torsion spring and the second limit rod. This device can adjust the heating state in real time according to the oil production rate and crude oil flow rate, ensure that the crude oil flows at the optimal temperature, improve the oil production efficiency, and at the same time achieve automatic control, enhancing the adaptability and flexibility of the device. Brief Description of the Drawings

[0022] Figure 1 is a perspective view of the device of the present invention;

[0023] Figure 2 is a structural diagram of the device of the present invention;

[0024] Figure 3 is a sectional view of the device of the present invention;

[0025] Figure 4 is a structural diagram of the annular groove of the device of the present invention;

[0026] Figure 5 is an exploded view of the flow rate monitoring component of the device of the present invention;

[0027] Figure 6 is a structural diagram of the flow rate monitoring component of the device of the present invention;

[0028] Figure 7 is a sectional view of the limit disc of the device of the present invention;

[0029] Figure 8 is of the present invention Figure 1 enlarged view at A in;

[0030] Figure 9 is of the present invention Figure 2 enlarged view at B in;

[0031] Figure 10 is of the present invention Figure 4 enlarged view at C in.

[0032] In the figure:

[0033] 1, Christmas tree; 2, outer pipe; 3, inner pipe; 31, first circular groove; 32, annular groove; 4, electric heating component; 41, telescopic heating plate; 42, rack; 421, first limit rod; 422, disc; 423, second limit rod; 424, convex block; 43, gear; 44, rotating rod; 5, flow rate monitoring component; 51, fixed block; 52, first through groove; 53, flow meter; 531, control end; 532, conjugate rotor; 5321, second rotating shaft; 5322, first bevel gear; 5323, second bevel gear; 54, universal joint; 55, first limit disc; 551, spring; 56, second through groove; 57, slider; 58, second limit disc; 581, second circular groove; 582, first limit block; 583, second limit block; 584, third through groove; 59, connecting rod. Detailed implementation mode

[0034] The following further describes the implementation mode of the present invention in detail in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] As shown in Figures 1 - 10 the figure, the present invention provides an oil production device suitable for small wellbore electric heating and monitoring, including: a Christmas tree 1, a outer pipe 2 is arranged at the bottom of the Christmas tree 1, an inner pipe 3 is arranged inside the outer pipe 2, an electric heating component 4 is arranged inside the inner pipe 3, and a flow rate monitoring component 5 is arranged inside the outer pipe 2;

[0036] The electric heating component 4 includes a telescopic heating plate 41, the telescopic heating plate 41 is fixedly connected inside the outer pipe 2, racks 42 are fixedly connected to both ends of the telescopic heating plate 41, and the heating range and power can be dynamically adjusted according to the crude oil flow rate and temperature requirements to ensure that the crude oil flows at the optimal temperature, reduce viscosity, and improve oil production efficiency. A gear 43 is arranged in the middle of the two racks 42, the gear 43 meshes with the rack 42, when the gear 43 rotates, the telescopic heating plates 41 at the head and tail are driven to move synchronously through the rack 42, realizing the dynamic adjustment of the heating range, and a rotating rod 44 is fixedly connected to the side of the gear 43 away from the telescopic heating plate 41;

[0037] The flow rate monitoring component 5 includes a fixed block 51, the fixed block 51 is fixedly connected between the outer pipe 2 and the inner pipe 3, the inside of the fixed block 51 is hollow, providing an installation space for the flow meter 53, and at the same time protecting the flow meter 53 from the harsh environment in the wellbore. Four first through grooves 52 are evenly distributed on the fixed block 51, and a flow meter 53 is arranged in the first through groove 52 for real-time monitoring of the crude oil flow rate at different positions. This multi-point monitoring can provide more accurate flow rate data, which helps to accurately control the heating range and power of the telescopic heating plate 41 and further optimize the oil production efficiency.

[0038] As a technical solution of the present invention, a first circular groove 31 is opened inside the outer pipe 2, an annular groove 32 is opened inside the first circular groove 31, both ends of the telescopic heating plate 41 are fixedly connected to the inner walls on both sides of the annular groove 32, and the rotating rod 44 is rotatably connected to the first circular groove 31.

[0039] As a technical solution of the present invention, a first limiting rod 421 is fixedly connected to one side of the rack 42 away from the gear 43. A disc 422 is rotatably connected to one side of the rack 42 in the annular groove 32. A second limiting rod 423 is fixedly connected to the disc 422. A plurality of the second limiting rods 423 are provided, and the plurality of the second limiting rods 423 are distributed in a semicircular shape on the disc 422. The other side of the disc 422 is connected to the inner wall of the annular groove 32 through a torsion spring. When the disc 422 rotates, the torsion spring will be stretched or compressed, thereby storing energy. This stored energy is released when needed to drive the disc 422 and the second limiting rod 423 to rotate in the reverse direction, thereby realizing the automatic reset of the telescopic heating plate 41, improving the automation degree and stability of the oil production system. A convex block 424 is fixedly connected between the second limiting rods 423 in the annular groove 32. The convex block 424 is arc-shaped, but no convex block 424 is provided between the second limiting rods 423 at the upper half of the top.

[0040] As a technical solution of the present invention, the flowmeter 53 includes control ends 531 fixedly connected to both sides of the flowmeter 53. The control ends 531 are located on both sides of the flowmeter 53 and are within the hollow part of the fixed block 51 and between the two first through grooves 52. A conjugate rotor 532 is rotatably connected in the first through groove 52.

[0041] As a technical solution of the present invention, two conjugate rotors 532 are provided in total. The two conjugate rotors 532 engage with each other. When the two conjugate rotors 532 rotate, they can continuously divide the measured petroleum into known single volume parts. A second rotating shaft 5321 is penetrated through the middle parts of the two conjugate rotors 532. One end of the two conjugate rotors 532 extends out of the housing of the control end 531.

[0042] As a technical solution of the present invention, one end of the second rotating shaft 5321 on one of the conjugate rotors 532 is fixedly connected to a first bevel gear 5322. A second bevel gear 5323 is provided on one side of the first bevel gear 5322. The first bevel gear 5322 meshes with the second bevel gear 5323. The second bevel gear 5323 is fixedly connected to the second rotating shaft 5321 in another flowmeter 53.

[0043] As a technical solution of the present invention, one end of the second rotating shaft 5321 not connected to the first bevel gear 5322 is fixedly connected to a universal joint 54. One end of the universal joint 54 away from the second rotating shaft 5321 is fixedly connected to a first limiting disc 55. Four second through grooves 56 are uniformly distributed on the first limiting disc 55. A slider 57 is slidably connected in the second through groove 56;

[0044] A second limiting disk 58 is slidably connected to the rotating rod 44. A connecting rod 59 is rotatably connected between the second limiting disk 58 and the slider 57, and a spring 551 is fixedly connected between the first limiting disk 55 and the second limiting disk 58.

[0045] As a technical solution of the present invention, a third through groove 584 having the same size as the rotating rod 44 is formed in the middle of the second limiting disk 58. A second circular groove 581 is formed in the second limiting disk 58 on one side of the third through groove 584. A first limiting block 582 is fixedly connected in the second circular groove 581, and a plurality of the first limiting blocks 582 are provided.

[0046] A second limiting block 583 is fixedly connected to the end of the rotating rod 44 away from the gear 43. A plurality of the second limiting blocks 583 are provided. Both the first limiting block 582 and the second limiting block 583 are elliptical. When the ends of the two come into contact with each other, they will slide down along the arc surface on the side, thereby preventing jamming.

[0047] Working principle:

[0048] As Figures 1 - 2 and Figures 5 - 10 shown, when oil production work is carried out, the staff starts the telescopic heating plate 41 to heat the liquid in the well. The liquid passes through the first through groove 52 and drives the two conjugate rotors 532 to rotate. The conjugate rotors 532 drive the second rotating shaft 5321 to rotate. Since the two conjugate rotors 532 are engaged with each other, when the two conjugate rotors 532 rotate, they can continuously divide the measured liquid into known single volume parts. The end of the second rotating shaft 5321 away from the motor drives the first bevel gear 5322 to rotate. The first bevel gear 5322 is engaged with the second bevel gear 5323, thereby driving the second bevel gear 5323 to rotate. The second bevel gear 5323 drives the flowmeter 53 on one side to operate and measure the liquid flow. According to the above steps, the remaining two groups of flowmeters 53 are driven to operate, so that they can operate synchronously, and the flow in each first through groove 52 is the same.

[0049] As Figures 1 - 2 and Figures 3 - 10As shown, the rotation of the second shaft 5321 drives the universal joint 54 to rotate, and the universal joint 54 drives the limit plate 1 55 to rotate. Since the limit plate 2 58 is slidably connected with the rotating rod 44 at this time, when the limit plate 1 55 drives the connecting rod 59 to rotate, and then drives the limit plate 2 58 to rotate through the connecting rod 58, the gear 43 will not rotate accordingly; when the flow rate increases, the conjugate rotor 532 drives the second shaft 5321 to rotate faster, the second shaft 5321 drives the universal joint 54 to rotate faster, and the universal joint 54 drives the limit plate 1 55 to rotate. As the speed exceeds the critical threshold, this At this time, the slider 57 on the limit plate 1 55 begins to feel the significant centrifugal force. Driven by the centrifugal force, the slider 57 begins to slide in the direction away from the through groove 2 56 and pulls one end of the connecting rod 59 to rotate. The other end of the connecting rod 59 pulls the limit plate 2 58 to move towards the limit plate 1 55 and compresses the spring 551. At the same time, the plurality of limit blocks 1 582 in the circular groove 2 581 and the plurality of limit blocks 2 583 on the rotating rod 44 are engaged with each other. Since both are elliptical, when the ends of the two contact each other, they will slide down along the arc surface of the side to enter. The rotation of the gear 43 drives the racks 42 on both sides to move in opposite directions, and pulls the telescopic heating plates 41 on both sides away from each other, thereby dynamically adjusting the heating power and heating range of the telescopic heating plates 41 to adapt to the changes in the crude oil flow rate, so that the device can adjust the heating state in real time according to the actual oil production speed and the changes in the crude oil flow rate, ensuring that the crude oil flows at the optimal temperature, thereby improving the oil production efficiency; at the same time, when the rack 42 moves, the limit plate 2 58 drives the rotating rod 44 to rotate, and the rotating rod 44 drives the gear 43 to rotate, and the gear 43 rotates to drive the racks 42 on both sides to move in opposite directions, and pulls the telescopic heating plates 41 on both sides away from each other, thereby dynamically adjusting the heating power and heating range of the telescopic heating plates 41 to adapt to the changes in the crude oil flow rate, so that the device can adjust the heating state in real time according to the actual oil production speed and the changes in the crude oil flow rate, ensuring that the crude oil flows at the optimal temperature, and improving the oil production efficiency. The rod 1 421 pushes the limiting rod 2 423 to drive the disk 422 to rotate, thereby compressing the torsion spring, and the plurality of limiting rods 2 423 pass through the arc-shaped protrusion 424 through the thrust of the limiting rod 1 421, until the protrusion 424 is located between the last limiting rod 2 423 and the second to last limiting rod 2 423. At this time, the limiting rod 1 421 moves the limiting rod 2 423 counterclockwise in the upward process, but cannot pass through the protrusion 424. When the rack 42 is completely away from the limiting rod 2 423 at the bottom, the protrusion 424 restricts the limiting rod 2 423 from rotating clockwise.

[0050] like Figures 1 - 10As shown, when the oil production rate slows down, the spring 551 loses the suppression of the centrifugal force, and the second limiting plate 58 is pushed by the spring 551 to slide away from the first limiting plate 55, and the first limiting block 582 and the second limiting block 583 are separated. At the same time, the connecting rod 59 is pulled to rotate, and the connecting rod 59 pulls the slider 57 to slide in the second through groove 56, so that the rotating rod 44 is separated from the second limiting plate 58. When the second limiting plate 58 rotates, it cannot drive the rotating rod 44 to rotate. At this time, the second limiting rod 423 at the upper half is not restricted by the convex block 424. The torsion spring on one side of the disc 422 drives the disc 422 to rotate clockwise, and drives the second limiting rod 423 to rotate synchronously. The second limiting rod 423 pushes the first limiting rod 421 to move downward, and then drives the rack 42 to move downward. As the rack 42 moves downward, the first limiting rod 421 pushes the second limiting rod 423 at the outermost layer of the bottom to rotate clockwise, and the second limiting rods 423 at the bottom all rotate clockwise, and then return to the original position, and drive the telescopic heating plates 41 on both sides to approach each other, and return to the initial state, preparing for the next rapid oil production operation.

[0051] The embodiments of the present invention are given for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for electric heating and monitoring oil production in small wells, comprising: A Christmas tree (1), characterized in that an outer tube (2) is arranged at the bottom of the Christmas tree (1), an inner tube (3) is arranged inside the outer tube (2), an electric heating component (4) is arranged inside the inner tube (3), and a flow monitoring component (5) is arranged inside the outer tube (2); The electric heating assembly (4) comprises a telescopic heating plate (41), the telescopic heating plate (41) being fixedly connected inside the outer tube (2), racks (42) being fixedly connected to both ends of the telescopic heating plate (41), a gear (43) being provided in the middle of the two racks (42), the gear (43) being meshed with the racks (42), and a rotating rod (44) being fixedly connected to the side of the gear (43) away from the telescopic heating plate (41); The flow monitoring assembly (5) comprises a fixed block (51), the fixed block (51) being fixedly connected between the outer tube (2) and the inner tube (3), the interior of the fixed block (51) being hollow, the fixed block (51) being evenly distributed with four through slots (52), and a flow meter (53) being arranged in the through slots (52).

2. A device for electric heating and monitoring oil production in a small wellbore as claimed in claim 1, characterized in that: A circular groove (31) is provided in the outer tube (2), an annular groove (32) is provided inside the circular groove (31), two ends of the telescopic heating plate (41) are fixedly connected to the inner walls of both sides of the annular groove (32), and the rotating rod (44) is rotatably connected to the circular groove (31).

3. A device for electric heating and monitoring oil production in small wells as claimed in claim 2, characterized in that: A limiting rod 1 (421) is fixedly connected to one side of the rack (42) away from the gear (43); a disk (422) is rotatably connected to one side of the rack (42) in the annular groove (32); a limiting rod 2 (423) is fixedly connected to the disk (422); a plurality of limiting rods 2 (423) are provided, and the plurality of limiting rods 2 (423) are distributed in a semicircular shape on the disk (422); the other side of the disk (422) is connected to the inner wall of the annular groove (32) via a torsion spring; a protrusion (424) is fixedly connected to the annular groove (32) between the limiting rods 2 (423); the protrusion (424) is arc-shaped, but no protrusion (424) is provided between the limiting rods 2 (423) at the top half.

4. The device for electric heating and monitoring oil production in small wells as claimed in claim 1, characterized in that: The flow meter (53) comprises control ends (531) fixedly connected to both sides of the flow meter (53); the control ends (531) are located on both sides of the flow meter (53) and are located in a hollow portion of the fixed block (51) and between the two through slots 1 (52); a conjugate rotor (532) is rotatably connected in the through slot 1 (52).

5. A device for electric heating and monitoring oil production in small wells as claimed in claim 4, characterized in that: There are two conjugate rotors (532) in total, the two conjugate rotors (532) are engaged with each other, a second rotating shaft (5321) is provided through the middle of the two conjugate rotors (532), and one end of the two conjugate rotors (532) extends out of the outer shell of the control end (531).

6. A device for electric heating and monitoring oil production in small wells as claimed in claim 5, characterized in that: One end of the second rotating shaft (5321) on one of the conjugate rotors (532) is fixedly connected to a bevel gear one (5322), a bevel gear two (5323) is provided on one side of the bevel gear one (5322), the bevel gear one (5322) is meshed with the bevel gear two (5323), and the bevel gear two (5323) is fixedly connected to the second rotating shaft (5321) in the other flow meter (53).

7. A device for electric heating and monitoring oil production in small wells as claimed in claim 6, characterized in that: One end of the second rotating shaft (5321) not connected to the first bevel gear (5322) is fixedly connected to a universal joint (54), and one end of the universal joint (54) away from the second rotating shaft (5321) is fixedly connected to a limiting plate (55), and the limiting plate (55) is evenly distributed with four second through grooves (56), and a slider (57) is slidably connected in the second through grooves (56); The rotating rod (44) is slidably connected to a second limiting plate (58), a connecting rod (59) is rotatably connected between the second limiting plate (58) and the sliding block (57), and a spring (551) is fixedly connected between the first limiting plate (55) and the second limiting plate (58).

8. A device for electric heating and monitoring oil production in small wells as claimed in claim 7, characterized in that: A through slot three (584) having the same size as the rotating rod (44) is provided in the middle of the second limiting plate (58); a circular slot two (581) is provided on one side of the through slot three (584) on the second limiting plate (58); a limiting block one (582) is fixedly connected in the second circular slot (581); and the limiting block one (582) is provided with a plurality of; One end of the rotating rod (44) away from the gear (43) is fixedly connected to the second limiting block (583), and the second limiting block (583) is provided with a plurality of them. Both the first limiting block (582) and the second limiting block (583) are elliptical.

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