Rodless pump well with hydraulically assisted dewaxing device

Abstract

A rodless pump well with hydraulically assisted dewaxing device is disclosed. It comprises, from bottom to top, a hydraulic forming system, an umbrella-shaped spreading system, a dewaxing system, a climbing system, a straightening device, and a control system, all arranged inside the tubing. The rodless pump well with hydraulically assisted dewaxing device and method provided by this invention have the following advantages: simple operation, it is lowered into the wellbore during pump operation, and requires no additional manual maintenance. Especially when the battery is depleted, the device can be sent to the wellhead with the upward lifting assistance provided by the rodless pump, and the climbing motor can drive the device upward, thereby reducing the power consumption of the climbing motor, extending the device's time in the well, effectively solving the practical problem of dewaxing in rodless pump wells, reducing costs, ensuring safety and environmental protection, and facilitating widespread adoption.

Description

Technical Field

[0001] This invention belongs to the field of oil production equipment technology, and specifically relates to a rodless pump well with hydraulically assisted dewaxing device. Background Technology

[0002] Oil well production mainly relies on mechanical equipment to pump crude oil from the oil layer to the surface. Electric submersible screw pumps are mainly used in oil wells with low fluid volume for energy-saving considerations. Therefore, wax buildup in the tubing is common in the field, and wax removal is also quite troublesome. If wax removal is not done in time, it will seriously affect production, causing problems such as wellbore blockage and no oil production, or pump unit burnout due to overheating. Currently, there are several methods for dewaxing the tubing of electric submersible screw pumps: First, using a wax scraper. This method requires a dewaxing truck, which uses its power to lower and raise the scraper for dewaxing. However, this requires a significant amount of manpower, generally three or more people, and carries certain safety risks, plus it is costly. Second, hot washing dewaxing. This method uses a dewaxing truck to heat water or the produced fluid in the wellbore to create a high-temperature dewaxing fluid. This high-temperature dewaxing fluid is pumped into the well from the annulus to heat the tubing, melting the wax deposits on the inner wall of the tubing. The wax is then carried out by the produced fluid and the pumped dewaxing fluid. The first method involves a ground-based system to remove wax, but this method is inherently dangerous due to the use of high-temperature wax-removing fluid and potentially even high-temperature steam, and it is also costly. The second method involves a cable-operated electric wax-removal system, which adds a motor to a wax-removal device with a scraper blade. The motor drives the device to move up and down to remove wax, requiring a cable to power it. Because a cable is needed for power, cable retrieval and lowering become problematic. The main challenge is synchronizing the movement of the wax-removal device with the retrieval of the cable and wire rope, which can easily lead to tangling, wear, and electrical leakage.

[0003] Chinese Patent Application No. 201910175361.2 discloses a "variable diameter hydraulic mechanical wax removal device". However, the "hydraulic" aspect of this device is mainly used to drive the wax scraper blade to change diameter.

[0004] Chinese Patent Application No. 201910496052.5 discloses "A device and method for hot cleaning and dewaxing inside an oil pipe". The device includes a hot cleaning and dewaxing apparatus, an oil pipe sleeved outside the apparatus, and distributed temperature-sensing optical fibers disposed on the outer wall of the oil pipe. However, this invention only describes a hot cleaning and dewaxing method and does not involve a mechanical automatic dewaxing method.

[0005] Chinese Patent Application No. 201821910881.0 discloses a "dedicated wax removal device for self-flowing well tubing". This device uses an electric cable for wax removal and can automatically switch directions to remove wax buildup on the inner wall, but it suffers from problems such as high investment and complex operation.

[0006] Chinese Patent Application No. 201621180653.3 discloses a "mechanical wax removal device for rodless oil wells". This device is lowered into a rodless oil well (mainly referring to an electric submersible pump). Through the combined action of a sealing plug, a lower baffle, and a wax scraper, the wax scraper scrapes the wax upwards to the reversing pipe and then begins to reverse downwards. However, this device only uses mechanical wax removal and still requires manual operation, resulting in a long operation cycle and high labor costs. Summary of the Invention

[0007] To address the aforementioned problems, the present invention aims to provide a rodless pump well with hydraulically assisted dewaxing device and method.

[0008] To achieve the above objectives, the rodless pump well with hydraulically assisted dewaxing device provided by the present invention includes, from bottom to top, a hydraulic forming system, an umbrella-shaped spreading system, a dewaxing system, a climbing system, a straightening device, and a control system arranged inside the tubing; wherein, the hydraulic forming system includes a sealing outer tube, a sealing inner cylinder, and a limiting device; the sealing outer tube is an annular boss protruding inward from the inner circumference of the lower end of the tubing; the sealing inner cylinder has multiple sieve holes formed on its lower end face, the internal cavity is a hydraulic channel, the upper part has multiple fluid flow holes formed radially, and an annular sealing platform protruding outward on the lower outer circumference to cooperate with the sealing outer tube to form a seal, and a limiting ring protruding outward on the upper outer circumference of the annular sealing platform to lock onto the upper end of the sealing outer tube;

[0009] The umbrella-shaped opening system includes a hydraulic umbrella opening block, a hydraulic umbrella, a hydraulic slider, an outer umbrella cylinder, a return spring, and a fixing rod. The lower end of the fixing rod is fixed to the upper end of the sealed inner cylinder, and its lower edge protrudes outward to form a raised edge. The hydraulic umbrella opening block is annular, fitted around the upper outer part of the sealed inner cylinder, with its lower end located at the top of the annular sealing platform. The hydraulic slider has an annular structure with a U-shaped cross-section, opening inward, its middle part fitted around the outer side of the raised edge, and its lower end located below the fluid flow hole on the sealed inner cylinder. The return spring is positioned in the space between the upper end of the hydraulic slider and the raised edge. The outer umbrella cylinder has an annular structure with a 7-shaped cross-section, its middle part tightly attached to the outer side of the hydraulic slider, its upper end fixed to the outer surface of the middle part of the fixing rod, and its lower end located above the hydraulic umbrella opening block, thus forming a hydraulic umbrella inlet / outlet between the lower end of the outer umbrella cylinder and the upper end of the hydraulic umbrella opening block. The hydraulic umbrella has an annular structure, its upper end connected to the lower end of the hydraulic slider, and its lower end able to enter and exit the hydraulic umbrella inlet / outlet.

[0010] The wax removal system includes a wax brush end retainer, a wax brush retractor, a wax brush, a motor sleeve protector, a wax brush retractor push cylinder, an outer cover, a wax battery, and a wax motor. The outer cover is mounted on the upper end of a fixing rod at the center of its bottom surface, and houses the wax motor and wax battery inside. A power transmitter with external threads is mounted on the output shaft of the wax motor. The upper inner part of the wax brush retractor push cylinder has internal threads, with its upper part penetrating the outer side of the bottom surface of the outer cover before threading onto the power transmitter, and its lower part located outside the fixing rod. The wax brush retractor is a ring-shaped structure located outside the fixing rod. Therefore, it can slide freely on the fixed rod, and its upper end is connected to the lower end of the wax brush retractor push cylinder; the wax brush end retainer is a ring structure, installed on the upper outer surface of the fixed rod below the wax brush retractor; the wax brush is a ring structure, with its upper part surrounding the outside of the wax brush retractor, and its lower end connected to the wax brush end retainer; the motor rubber sleeve protector is made of a ring elastic membrane, with its upper end connected to the bottom surface of the outer cover at the part outside the wax brush retractor push cylinder, and its lower end fixed to the top surface of the wax brush retractor to prevent damage to the wax brush motor and wax brush battery due to water ingress during production;

[0011] The climbing system includes a climbing roller, a housing, climbing wheels, a climbing motor, and a climbing battery. The climbing motor and climbing battery are located inside the housing, with the output shaft of the climbing motor located at the lower end. The upper end of the central shaft of the climbing roller is connected to the output shaft of the climbing motor, and the lower end is fixed to the top surface of the outer cover. Multiple guide grooves are spirally formed on the outer circumference. The climbing wheel is installed between two adjacent guide grooves and is in close contact with the inner circumference of the oil pipe.

[0012] The control system is installed at the top of the enclosure and includes a controller and a power supply battery. The controller is electrically connected to the wax sweeping motor and the climbing motor, respectively.

[0013] The straightening device includes an arc-shaped bracket and rolling wheels; the arc-shaped bracket is flexible and vertically arranged, and multiple arc-shaped brackets are installed at intervals on the outer circumference of the controller. At least one rolling wheel is installed in the middle of each arc-shaped bracket, and the rolling wheel abuts against the inner circumference of the oil pipe.

[0014] The cross-section of the sealed outer tube is an upright trapezoidal shape.

[0015] A sealing ring is provided between the contact surface of the convex edge and the hydraulic slider, and between the hydraulic slider and the outer tube of the umbrella.

[0016] The overall diameter of the straightening device is larger than the inner diameter of the oil pipe, so it is tightly fitted with the oil pipe.

[0017] The rodless pump well hydraulically assisted dewaxing device and method provided by the present invention have the following beneficial effects:

[0018] It is easy to operate, and is lowered into the wellbore during pumping operations. No additional manual maintenance is required in daily operations. In particular, when the battery is depleted, the device can be lifted to the wellhead with the help of the rodless pump. The auxiliary climbing motor drives the device upward, thereby reducing the power consumption of the climbing motor and extending the device's time in the well. It effectively solves the practical problem of rodless pump well wax removal, reduces costs, is safe and environmentally friendly, and is easy to promote. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the rodless pump well hydraulically assisted dewaxing device provided by the present invention, which descends inside the tubing and sits on the sealed outer pipe.

[0020] Figure 2 This is a cross-sectional view of the hydraulic forming system structure in the rodless pump well with hydraulically assisted dewaxing device provided by the present invention.

[0021] Figure 3 This is a cross-sectional view of the umbrella-shaped spreading system structure in the rodless pump well hydraulically assisted dewaxing device provided by the present invention.

[0022] Figure 4 This is a cross-sectional view of the dewaxing system in the rodless pump well with hydraulically assisted dewaxing device provided by the present invention.

[0023] Figure 5 The diagram shows the climbing system structure in the rodless pump well with hydraulically assisted dewaxing device provided by the present invention, wherein (a) is an enlarged view of the climbing system structure, (b) is a schematic diagram of the outer surface of the climbing drum, and (c) is a cross-sectional view of the climbing drum in the transverse direction.

[0024] Figure 6 This is a cross-sectional view of the uprighting system and control system in the rodless pump well hydraulically assisted dewaxing device provided by the present invention.

[0025] Figure 7 A schematic diagram of the operating status of the rodless pump well with hydraulically assisted dewaxing device provided by the present invention. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1-7As shown, the rodless pump well with hydraulically assisted dewaxing device provided by the present invention includes, from bottom to top, a hydraulic forming system 1, an umbrella-shaped opening system 2, a dewaxing system 3, a climbing system 4, a straightening device 5, and a control system 6 arranged inside the tubing 7; wherein, the hydraulic forming system 1 includes a sealing outer tube 1-1, a sealing inner cylinder 1-2, and a limiting ring 1-4; the sealing outer tube 1-1 is an annular boss protruding inward from the inner circumference of the lower end of the tubing 7; the sealing inner cylinder 1-2 has multiple screen holes 1-3 formed on the lower end face, the internal cavity is a hydraulic channel 1-5, the upper part has multiple liquid flow holes 1-7 formed radially, and an annular sealing platform 1-6 protruding outward on the lower outer circumference to cooperate with the sealing outer tube 1-1 to form a seal, and a limiting ring 1-4 protruding outward on the upper outer circumference of the annular sealing platform 1-6 to be stuck on the upper end of the sealing outer tube 1-1;

[0028] The umbrella-shaped opening system 2 includes a hydraulic umbrella opening block 2-1, a hydraulic umbrella 2-2, a hydraulic slider 2-3, an outer umbrella cylinder 2-4, a return spring 2-5, and a fixing rod 2-7. The lower end of the fixing rod 2-7 is fixed to the upper end of the sealing inner cylinder 1-2, and its lower edge protrudes outward to form a flange 2-8. The hydraulic umbrella opening block 2-1 is annular, fitted around the upper outer part of the sealing inner cylinder 1-2, with its lower end located on top of the annular sealing platform 1-6. The hydraulic slider 2-3 has an annular structure with a U-shaped cross-section, opening inward, its middle part fitted around the outer side of the flange 2-8, and its lower end located within the sealing inner cylinder. The lower side of the liquid flow hole 1-7 on the cylinder 1-2; the return spring 2-5 is set in the space between the upper end of the hydraulic slider 2-3 and the convex edge 2-8; the outer umbrella cylinder 2-4 is a ring structure with a cross-section in the shape of a 7. The middle part is tightly attached to the outside of the hydraulic slider 2-3, the upper end is fixed to the middle outer surface of the fixing rod 2-7, and the lower end is located above the hydraulic umbrella opening block 2-1, thereby forming a hydraulic umbrella inlet and outlet between the lower end of the outer umbrella cylinder 2-4 and the upper end of the hydraulic umbrella opening block 2-1; the hydraulic umbrella 2-2 is a ring structure with the upper end connected to the lower end of the hydraulic slider 2-3 and the lower end able to enter and exit the hydraulic umbrella inlet and outlet;

[0029] The wax removal system 3 includes a wax brush end retainer 3-1, a wax brush retractor 3-2, a wax brush 3-3, a motor sleeve protector 3-4, a wax brush retractor pusher 3-5, an outer cover 3-6, a wax battery 3-7, and a wax motor 3-8. The outer cover 3-6 is mounted on the upper end of the fixing rod 2-7 at the center of its bottom surface, and houses the wax motor 3-8 and the wax battery 3-7. The output shaft of the wax motor 3-8 has a power transmitter with external threads. The upper part of the wax brush retractor pusher 3-5 has internal threads, with the upper part penetrating the outer side of the bottom surface of the outer cover 3-6 before the threads connect to the power transmitter, and the lower part located outside the fixing rod 2-7. The wax brush retractor 3-2 is a ring-shaped structure and is mounted on the fixing rod 2-7. -7 is located on the outside of the fixed rod 2-7, so it can slide freely on the fixed rod 2-7, and its upper end is connected to the lower end of the wax brush retractor push cylinder 3-5; the wax brush end retainer 3-1 is a ring structure, installed on the upper outer surface of the fixed rod 2-7 below the wax brush retractor 3-2; the wax brush 3-3 is a ring structure, with its upper part surrounding the outside of the wax brush retractor 3-2, and its lower end connected to the wax brush end retainer 3-1; the motor rubber sleeve protector 3-4 is made of a ring elastic membrane, with its upper end connected to the bottom surface of the outer cover 3-6 outside the wax brush retractor push cylinder 3-5, and its lower end fixed to the top surface of the wax brush retractor 3-2, to prevent the wax motor 3-8 and the wax battery 3-7 from being damaged by water during the production process;

[0030] The climbing system 4 includes a climbing roller 4-1, a housing 4-2, climbing wheels 4-3, a climbing motor, and a climbing battery. The climbing motor and climbing battery are located inside the housing 4-2, and the output shaft of the climbing motor is located at the lower end. The upper end of the central shaft of the climbing roller 4-1 is connected to the output shaft of the climbing motor, and the lower end is fixed to the top surface of the outer cover 3-6. Multiple guide grooves 4-4 are spirally formed on the outer circumference surface. The climbing wheel 4-3 is installed between two adjacent guide grooves 4-4, and the climbing wheel 4-3 is in close contact with the inner circumference surface of the oil pipe 7.

[0031] The control system 6 is installed on the upper part of the housing 4-2, including the controller 6-1 and the power supply battery 6-2, and the controller 6-1 is electrically connected to the wax sweeping motor 3-8 and the climbing motor respectively;

[0032] The straightening device 5 includes an arc-shaped bracket 5-1 and a roller 5-2; the arc-shaped bracket 5-1 is elastic and vertically arranged, and multiple arc-shaped brackets 5-1 are spaced apart on the outer circumferential surface of the controller 6. At least one roller 5-2 is installed in the middle of each arc-shaped bracket 5-1, and the roller 5-2 abuts against the inner circumferential surface of the oil pipe 7.

[0033] The sealing outer tube 1-1 has a vertical trapezoidal cross-section. The function of the sealing outer tube 1-1 with this structure is to cooperate with the limiting ring 1-4 to limit the length of the wax removal section; the limiting ring 1-4 also has the function of helping to seal.

[0034] A sealing ring 2-6 is provided between the contact surfaces of the protruding edge 2-8 and the hydraulic slider 2-3, and between the hydraulic slider 2-3 and the outer tube 2-4 of the umbrella.

[0035] The overall diameter of the straightening device 5 is larger than the inner diameter of the oil pipe 7, so it is tightly fitted with the oil pipe 7.

[0036] The method of using the rodless pump well with hydraulically assisted dewaxing device provided by the present invention is described below:

[0037] When it is necessary to remove the wax buildup on the inner wall of tubing 7, the operator first retracts the hydraulic umbrella 2-2 in the umbrella-shaped opening system 2 into the interior of the hydraulic umbrella inlet and outlet; then the lower part of this device is inserted into tubing 7 from the wellhead. When the straightening device 5 reaches the upper end of tubing 7, since the overall diameter of the straightening device 5 is larger than the inner diameter of tubing 7, a certain external force needs to be applied to press the straightening device 5 into tubing 7. At this time, the middle part of the elastic bow-shaped support 5-1 will be in close contact with the inner wall of tubing 7, but due to the presence of the rolling wheel 5-2, it will not affect the up and down sliding of this device. Moreover, when using the wax removal system 3 for wax removal, it can be ensured that the control system 6 and the straightening device 5 will not rotate in the horizontal plane with the climbing system 4 when the climbing system 4 rotates. Then, under the control of controller 6-1, the climbing motor is started, which drives the climbing roller 4-1 and its lower components to rotate together, and with the help of the climbing wheel 4-3, the device moves downward; at the same time, the wax sweeping motor 3-8 is started, which drives the wax sweeping brush retractor push cylinder 3-5 and the wax sweeping brush retractor 3-2 to move down together and press down on the inner part of the wax sweeping brush 3-3, so that the upper part of the wax sweeping brush 3-3 opens up and contacts the inner wall of the oil pipe 7, and the continuously rotating wax sweeping brush 3-3 removes the oil. Wax forms on the inner wall of pipe 7; when the sealing inner cylinder 1-2 in the hydraulic forming system 1 descends to the position of the sealing outer pipe 1-1, the outer circumferential surface of the annular sealing platform 1-6 will be tightly attached to the inner circumferential surface of the sealing outer pipe 1-1 to form a seal, blocking the channel for the oil well produced fluid to flow upward from the sealing inner cylinder 1-2 and the sealing outer pipe 1-1. The limiting ring 1-4 will be stuck at the upper end of the sealing outer pipe 1-1 to limit the further descent of the device, while also helping to seal. At this point, the descent process ends.

[0038] At this time, since the oil pump on the lower side of the device is still in normal production, the produced liquid it lifts will flow into the space enclosed by the sealing inner cylinder 1-2 and the lower part of the hydraulic slider 2-3 through the screen hole 1-3, hydraulic channel 1-5 and liquid flow hole 1-7 on the sealing inner cylinder 1-2 in sequence. This will apply a downward force to the lower end of the hydraulic slider 2-3, causing the hydraulic slider 2-3 to move downward. At the same time, it will compress the return spring 2-5, thereby pushing the hydraulic umbrella 2-2 to extend outward from the hydraulic umbrella inlet and outlet and abut against the inner wall of the oil pipe 7, forming a certain degree of seal. The controller 6-1 reverses the wax removal motor 3-8, which in turn drives the wax removal brush retractor pusher 3-5 and the wax removal brush retractor 3-2 upwards until the wax removal brush retractor 3-2 leaves the wax removal brush 3-3, and the upper part of the wax removal brush 3-3 retracts away from the inner wall of the tubing 7. The climbing motor then reverses, causing the climbing roller 4-1 and its lower components to rotate. With the assistance of the climbing motor and the fluid produced in the hydraulic forming system 1, the device ascends to the wellhead, thus ending the upward movement. This saves power consumption of the climbing motor and extends the device's well dwell time.

[0039] In addition, if the climbing battery in this device is low on power and the device has difficulty moving upwards, hydraulic pressure can be used to assist the climbing motor in driving upwards. This can effectively reduce the consumption of the device's own power, extend the device's operating time, and save energy. Moreover, when the device's own power is insufficient, the hydraulic pressure alone can lift the entire device to the wellhead for charging. This can prevent the entire device from getting stuck at a certain position when lifted to the wellhead due to insufficient power, which would require a workover operation to retrieve the device.

Claims

1. A rodless pump well with hydraulically assisted dewaxing device, characterized in that: The rodless pump well with hydraulically assisted dewaxing device includes, from bottom to top, a hydraulic forming system (1), an umbrella-shaped spreading system (2), a dewaxing system (3), a climbing system (4), a straightening device (5), and a control system (6) arranged inside the tubing (7); wherein, the hydraulic forming system (1) includes a sealing outer tube (1-1), a sealing inner cylinder (1-2), and a limiting ring (1-4); the sealing outer tube (1-1) is an annular shape that protrudes inward from the inner circumference of the lower end of the tubing (7). The lower end face of the sealing inner cylinder (1-2) has multiple sieve holes (1-3), the internal cavity is a hydraulic channel (1-5), the upper part has multiple liquid flow holes (1-7) that are radially connected, and the lower outer circumferential surface protrudes outward to form an annular sealing platform (1-6) for cooperating with the sealing outer tube (1-1) to form a seal. The upper outer circumferential surface of the annular sealing platform (1-6) protrudes outward to form a limiting ring (1-4) that can be locked at the upper end of the sealing outer tube (1-1). The umbrella-shaped opening system (2) includes a hydraulic umbrella opening block (2-1), a hydraulic umbrella (2-2), a hydraulic slider (2-3), an outer umbrella cylinder (2-4), a return spring (2-5), and a fixing rod (2-7); wherein, the lower end of the fixing rod (2-7) is fixed to the upper end of the sealed inner cylinder (1-2), and the lower edge protrudes outward to form a raised edge (2-8); the hydraulic umbrella opening block (2-1) is annular, fitted on the upper outer part of the sealed inner cylinder (1-2), and the lower end is located on the top of the annular sealing platform (1-6); the hydraulic slider (2-3) is annular, with a door-shaped cross-section, the opening facing inward, the middle part fitted on the outside of the raised edge (2-8), and the lower end located on the top of the sealing platform (1-6). The inner cylinder (1-2) is located below the liquid flow hole (1-7); the return spring (2-5) is located in the space between the upper end of the hydraulic slider (2-3) and the convex edge (2-8); the outer cylinder (2-4) is an annular structure with a 7-shaped cross-section, the middle part is tightly attached to the outside of the hydraulic slider (2-3), the upper end is fixed to the middle outer surface of the fixing rod (2-7), and the lower end is located above the hydraulic umbrella opening block (2-1), thereby forming a hydraulic umbrella inlet and outlet between the lower end of the outer cylinder (2-4) and the upper end of the hydraulic umbrella opening block (2-1); the hydraulic umbrella (2-2) is an annular structure, the upper end is connected to the lower end of the hydraulic slider (2-3), and the lower end can enter and exit the hydraulic umbrella inlet and outlet; The wax removal system (3) includes a wax brush end retainer (3-1), a wax brush retractor (3-2), a wax brush (3-3), a motor sleeve protector (3-4), a wax brush retractor pusher (3-5), an outer cover (3-6), a wax battery (3-7), and a wax motor (3-8). The outer cover (3-6) is mounted on the upper end of the fixing rod (2-7) at the center of its bottom surface, and houses the wax motor (3-8) and the wax battery (3-7) inside. A power transmitter is mounted on the output shaft of the wax motor (3-8), and the power transmitter has an external thread. The upper inner part of the wax brush retractor pusher (3-5) has an internal thread, and its upper part passes through the outer side of the bottom surface of the outer cover (3-6) before being threaded onto the power transmitter. Its lower part is located outside the fixing rod (2-7). The wax brush retractor (3-2) is a ring structure, mounted on the fixing rod (2-7). The outer side of the fixed rod (2-7) allows it to slide freely on the fixed rod (2-7), and its upper end is connected to the lower end of the wax brush retractor push cylinder (3-5); the wax brush end retainer (3-1) is a ring structure, installed on the upper outer surface of the fixed rod (2-7) below the wax brush retractor (3-2); the wax brush (3-3) is a ring structure, with its upper part surrounding the outer side of the wax brush retractor (3-2), and its lower end connected to the wax brush end retainer (3-1); the motor rubber sleeve protector (3-4) is made of a ring elastic membrane, with its upper end connected to the bottom surface of the outer cover (3-6) outside the wax brush retractor push cylinder (3-5), and its lower end fixed to the top surface of the wax brush retractor (3-2) to prevent the wax motor (3-8) and wax battery (3-7) from being damaged by water during production; The climbing system (4) includes a climbing roller (4-1), a housing (4-2), a climbing wheel (4-3), a climbing motor, and a climbing battery; wherein the climbing motor and the climbing battery are located inside the housing (4-2), and the output shaft of the climbing motor is located at the lower end; the upper end of the central shaft of the climbing roller (4-1) is connected to the output shaft of the climbing motor, and the lower end is fixed to the top surface of the outer cover (3-6). Multiple guide grooves (4-4) are formed in a spiral shape on the outer circumference surface, and a climbing wheel (4-3) is provided between two adjacent guide grooves (4-4), and the climbing wheel (4-3) is in close contact with the inner circumference surface of the oil pipe (7); The control system (6) is installed at the top of the housing (4-2), including a controller (6-1) and a power supply battery (6-2), and the controller (6-1) is electrically connected to the wax sweeping motor (3-8) and the climbing motor respectively; The straightening device (5) includes an arc-shaped bracket (5-1) and a roller (5-2); the arc-shaped bracket (5-1) is elastic and vertically arranged, and multiple arc-shaped brackets (5-1) are spaced apart on the outer circumferential surface of the controller (6-1). At least one roller (5-2) is installed in the middle of each arc-shaped bracket (5-1), and the roller (5-2) abuts against the inner circumferential surface of the oil pipe (7).

2. The rodless pump well with hydraulically assisted dewaxing device according to claim 1, characterized in that: The cross-section of the sealed outer tube (1-1) is an upright trapezoidal shape.

3. The rodless pump well with hydraulically assisted dewaxing device according to claim 1, characterized in that: A sealing ring (2-6) is provided between the contact surfaces of the protruding edge (2-8) and the hydraulic slider (2-3), and between the hydraulic slider (2-3) and the outer tube of the umbrella (2-4).

4. The rodless pump well with hydraulically assisted dewaxing device according to claim 1, characterized in that: The overall diameter of the straightening device (5) is larger than the inner diameter of the oil pipe (7), so it is tightly fitted with the oil pipe (7).

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