A pumping unit power paraffin removal agent filling automation system and method

Abstract

The application discloses an oil pumping unit power paraffin removal and prevention agent filling automation system and method, relates to the technical field of oil and natural gas exploitation equipment, and solves the technical problem of the excessively complex structure of an existing paraffin removal system, and comprises a driving liquid cylinder power taking system, a power liquid cylinder power changing system, a medicament liquid cylinder agent injecting system and a medicament storage tank which are sequentially connected, and further comprises an electric control system; the driving liquid cylinder power taking system is used for sucking power of hydraulic oil; the power liquid cylinder power changing system is used for discharging or sucking back the hydraulic oil; the medicament liquid cylinder agent injecting system is used for sucking the paraffin removal and prevention agent in the medicament storage tank or injecting the paraffin removal and prevention agent into an oil production wellhead; the electric control system is connected with the driving liquid cylinder power taking system, the power liquid cylinder power changing system and the medicament liquid cylinder agent injecting system and can control the above systems; the application can realize intelligent well washing and paraffin removal without reforming the structure of the existing oil production wellhead, has a simple structure, is easy to install and arrange, and reduces working cost.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction equipment technology, and more specifically to an automated system and method for injecting anti-waxing agent into a pumping unit. Background Technology

[0002] Oilfield wells often experience wax buildup in the wellbore or blockage in the surrounding formation, requiring periodic or continuous injection of wax-removing agents, unblocking agents, or hot washing. Hot washing for wax removal involves circulating crude oil and hot water through a boiler truck to remove wax. Chemical wax removal uses different chemical agents injected into the wellbore to generate heat and remove wax buildup. Electrically heated wax removal uses a hollow sucker rod with a heating cable at the top and bottom to heat the well for wax removal. While this method is effective, it is complex and requires a high initial investment. These methods suffer from several problems: lack of automated control systems, high washing costs, high labor intensity for workers, slow processing times, and inconsistent results.

[0003] Regarding wax removal and prevention, Chinese patent application CN92216143.7 discloses an AC electric heating sucker rod heating device for heating the wellbore of oilfields, especially heavy oil or high-pour-point oilfields. It consists of a surface power supply section and a downhole heating section. The downhole heating cable and its lower end electric heating head are respectively placed inside the rod string and the sucker rod section formed by the hollow sucker rod. The space between the inner wall of the section and the electric heating head is filled with a conductive material. When the power is turned on, the downhole section forms a circuit to heat the wellbore. This device can effectively reduce viscosity or remove wax, thus becoming an ideal tool for the extraction of heavy oil and high-pour-point oil wells. Chinese patent application CN201620312481.4 discloses an oil well wax removal and prevention device, which is used to increase the temperature of crude oil in the oil well and prevent wax precipitation. It includes a water supply mechanism, a circulation mechanism, and a water outlet mechanism. The water supply mechanism provides water with a temperature higher than that of the crude oil to the oil well wax removal and prevention device. A circulation mechanism is installed inside the oil well and extends a predetermined length within it. It is connected to a water supply mechanism to allow water to flow within the circulation mechanism, thereby providing heat to the crude oil. A water outlet mechanism is connected to the circulation mechanism to discharge the water within it. This invention uses a circulation mechanism to circulate hot water supplied by the water supply mechanism within the oil well, heating the crude oil to be extracted and thus raising its temperature, solving the problem of wax precipitation at low temperatures. Furthermore, it saves energy compared to electric heating and fully utilizes the heat from waste hot water in the oil station. Chinese Patent Application No. CN201610231669 discloses an oil well wax removal and prevention device and method for increasing the temperature of crude oil in an oil well and preventing wax precipitation. It includes a water supply mechanism, a circulation mechanism, and a water outlet mechanism. The water supply mechanism provides water with a temperature higher than that of the crude oil to the oil well wax removal and prevention device. The circulation mechanism is installed inside the oil well and extends a predetermined length within it, connected to the water supply mechanism to allow water to flow within it, thereby providing heat to the crude oil. The water outlet mechanism is connected to the circulation mechanism to discharge water from the circulation mechanism. This invention uses the circulation mechanism to circulate hot water supplied by the water supply mechanism within the oil well, heating the crude oil to be extracted and thus raising its temperature, solving the problem of wax precipitation at low temperatures. Furthermore, it saves energy compared to electric heating and fully utilizes the heat from waste hot water within the oil station.

[0004] Although the aforementioned patents can utilize pumping units for oil well dewaxing and wax prevention, they require significant modifications to the existing pumping unit system and wellhead, resulting in an overly complex structure and an unreasonable form. The solutions to existing problems are rather one-sided, especially the process mode for oil well dewaxing and wax prevention, which lacks technological innovation and still requires substantial energy support, failing to resolve existing technological challenges. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that the existing dewaxing system is too complex. This invention provides an automated system and method for injecting dewaxing and anti-waxing agents into oil pumping units.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: An automated system for injecting anti-waxing agent into a pumping unit includes a drive cylinder power take-off system, a power cylinder power switching system, an agent cylinder injection system, and an agent storage tank connected in sequence, and also includes an electrical control system. The hydraulic cylinder power take-off system is used to extract power from hydraulic oil. The power cylinder force-changing system is used to discharge or draw back hydraulic oil; The chemical injection system is used to extract or inject the dewaxing agent from the chemical storage tank into the wellhead. The electronic control system is connected to the drive cylinder power take-off system, the power cylinder power switching system, and the drug cylinder injection system, and can control the above systems.

[0007] Furthermore, the power take-off system for the driving hydraulic cylinder includes a pumping unit walking beam, a transmission rod, a position slider, a proximity switch, a driving hydraulic cylinder, a rod chamber hydraulic interface, and a rodless chamber hydraulic interface; The pumping unit's walking beam is connected to the wellhead. The top of the transmission rod is connected to the pumping unit's walking beam, and the bottom is connected to the power take-off piston in the drive cylinder. The bottom of the drive cylinder is connected to the pumping unit's base. A position slider is mounted on the transmission rod. A proximity switch collects up and down stroke signals through the movement of the position slider. A rod-side hydraulic interface and a rodless hydraulic interface are respectively located in the rod-side and rodless sections of the drive cylinder and are connected to the power cylinder's power conversion system.

[0008] Furthermore, a connecting rod center guide is vertically connected to the middle of the transmission rod, and the end of the connecting rod center guide away from the transmission rod is connected to the pumping unit.

[0009] Furthermore, the transmission rod is equipped with a telescopic structure for adjusting its length.

[0010] Furthermore, the power cylinder force-converting system includes a hydraulic oil reservoir, a reservoir inlet, a reservoir outlet, a power cylinder, a rod-side hydraulic interface two, a rodless hydraulic interface two, a position slider two, and a proximity switch two. The power cylinder is equipped with a force-changing piston. The bottom of the force-changing piston is connected to a piston rod. The bottom end of the piston rod passes through the power cylinder and is used to drive the drug injection system to draw or inject the dewaxing agent. The position slider two is installed on the piston rod. The proximity switch two collects the up and down stroke signals through the movement of the position slider two. The second rod-side hydraulic interface and the second rodless hydraulic interface are respectively located in the rod-side and rodless sections of the power cylinder. The second rod-side hydraulic interface is connected to the first rod-side hydraulic interface through a connecting pipe, and the second rodless hydraulic interface is connected to the first rodless hydraulic interface through a connecting pipe. The inlet of the storage tank is connected to the first connecting pipe, and the outlet of the storage tank is connected to the second connecting pipe.

[0011] Furthermore, the chemical injection system includes an injection cylinder, a discharge port, and a suction port; the injection cylinder is equipped with an injection piston, which is connected to the bottom end of the piston rod; the discharge port is connected to the wellhead; and the suction port is connected to the chemical storage tank.

[0012] Furthermore, the liquid storage tank is connected to a solar thermal collector system for heating and maintaining the temperature of the anti-wax agent.

[0013] Furthermore, the liquid tank solar thermal collection system includes a thermal collector controller, a thermal collector plate, and a heating coil; the heating coil is located inside the pharmaceutical storage tank and is connected to the thermal collector controller and the thermal collector plate.

[0014] Furthermore, the electrical control system includes a PLC and an RTU; The PLC controls the opening and closing of the liquid storage tank inlet and outlet based on the signal feedback from proximity switch one and proximity switch two. The RTU remotely transmits work data and user commands to the cloud platform via wireless signals, and then the cloud platform processes the data before remotely transmitting it to the client or RTU.

[0015] In addition, the present invention also proposes a method for adding anti-wax agent based on the above-mentioned automated system for adding power cleaning agent to oil pumping units, characterized by comprising the following steps: When the power take-off piston of the drive hydraulic cylinder power take-off system moves upward, it drives the power switching piston of the drive hydraulic cylinder power switching system to move upward and discharges hydraulic oil into the drive hydraulic cylinder of the drive hydraulic cylinder power take-off system. At the same time, the upward movement of the power switching piston drives the injection piston of the drug liquid cylinder injection system to move upward, drawing the dewaxing agent in the drug storage tank into the injection cylinder of the drug liquid cylinder injection system. When the power take-off piston moves downward, the transfer piston also moves downward, drawing hydraulic oil into the power cylinder. Simultaneously, the downward movement of the transfer piston drives the injection piston downward, injecting the dewaxing agent into the wellhead. The beneficial effects of this invention are as follows: 1. This invention, through the coordination of a drive cylinder power take-off system, a power cylinder power conversion system, a chemical cylinder injection system, a chemical storage tank, and an electrical control system, enables intelligent well cleaning and wax removal without modifying the existing wellhead structure. The invention has a simple structure, is easy to install and arrange, reduces operating costs, and prevents well cleaning fluid backflow into the formation, thus avoiding impacts on oil well production. It also enables innovative applications of new energy sources in oilfield processes, contributing to carbon neutrality development.

[0016] 2. The wax removal and prevention agent injection method of the present invention allows for real-time control of parameters such as operating flow rate and temperature, and can be set remotely and via programming, significantly reducing the labor intensity of workers. Compared with existing conventional processes, the present invention can achieve wax removal and prevention without an injection pump, greatly reducing well washing costs and effectively extending the pump inspection cycle, thus achieving the goal of improving quality and efficiency.

[0017] 3. This invention utilizes a liquid tank solar thermal collection system to effectively cope with operations in extremely cold winter weather by using solar energy collection and heat exchange, and also saves energy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of the present invention; Figure 2 This is a schematic diagram of the hydraulic cylinder power take-off system in this invention; Figure 3 This is the present invention. Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the power cylinder force-converting system and the pharmaceutical cylinder injection system in this invention; Figure 5 This is a schematic diagram of the medicine storage tank and the solar thermal collection system of the tank in this invention.

[0019] Figure reference numerals: 1-Drive cylinder power take-off system; 101-Pumping unit walking beam; 102-Transmission rod; 103-Position slider one; 104-Proximity switch one; 105-Drive cylinder; 106-Rod chamber hydraulic interface one; 107-Rodless chamber hydraulic interface one; 108-Power take-off piston; 109-Connecting rod center guide; 110-Telescopic structure; 111-Connecting pipe one; 112-Connecting pipe two; 2-Power cylinder power conversion system; 201-Hydraulic oil reservoir; 202-Reservoir inlet; 203-Reservoir outlet; 204 - Power hydraulic cylinder; 205 - Rod-type hydraulic interface 2; 206 - Rodless hydraulic interface 2; 207 - Position slider 2; 208 - Proximity switch 2; 209 - Force-changing piston; 210 - Piston rod; 211 - Connector; 3 - Chemical injection system; 301 - Injection cylinder; 302 - Drain port; 303 - Suction port; 304 - Injection piston; 4 - Chemical storage tank; 5 - Electrical control system; 6 - Solar thermal collection system for liquid tank; 601 - Heat collector controller; 602 - Heat collector plate; 603 - Heating coil; 7 - Oil wellhead. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] Example 1 like Figure 1 As shown, this embodiment provides an automated system for injecting anti-waxing agent into a pumping unit, including a drive cylinder power take-off system 1, a power cylinder power switching system 2, an agent cylinder injection system 3, and an agent storage tank 4 connected in sequence, and also includes an electronic control system 5; The hydraulic cylinder power take-off system 1 is used to extract power from the hydraulic oil. The power cylinder switching system 2 is used to discharge or draw back hydraulic oil; The chemical liquid cylinder injection system 3 is used to draw out or inject the dewaxing agent in the chemical storage tank 4 into the oil wellhead 7; The electronic control system 5 is connected to the drive cylinder power take-off system 1, the power cylinder power switching system 2, and the drug cylinder injection system 3, and can control the above systems.

[0023] This invention, through the coordination of the drive cylinder power take-off system 1, the power cylinder power conversion system 2, the chemical cylinder injection system 3, and the chemical storage tank 4 with the electrical control system 5, can achieve intelligent well cleaning and wax removal without modifying the existing wellhead structure 7. The invention has a simple structure, is easy to install and arrange, reduces operating costs, and will not cause well cleaning fluid backflow into the formation, affecting oil well production. It can realize the innovative application of new energy in oilfield process measures and contribute to the development of "carbon neutrality".

[0024] Example 2 This embodiment is based on Embodiment 1, and describes the power take-off system 1 for driving the hydraulic cylinder.

[0025] like Figure 2 and Figure 3As shown, the driving hydraulic cylinder power take-off system 1 includes a pumping unit walking beam 101, a transmission rod 102, a position slider 103, a proximity switch 104, a driving hydraulic cylinder 105, a rod chamber hydraulic interface 106, and a rodless chamber hydraulic interface 107. The pumping unit walking beam 101 is connected to the wellhead 7. The top end of the transmission rod 102 is connected to the pumping unit walking beam 101, and the bottom end is connected to the power take-off piston 108 in the driving hydraulic cylinder 105. The bottom of the driving hydraulic cylinder 105 is connected to the base of the pumping unit. The position slider 103 is installed on the transmission rod 102. The proximity switch 104 collects the up and down stroke signals through the movement of the position slider 103. The rod chamber hydraulic interface 106 and the rodless chamber hydraulic interface 107 are respectively opened in the rod chamber and rodless chamber of the driving hydraulic cylinder 105 and are connected to the power cylinder power conversion system 2.

[0026] Among them, proximity switch 104 collects whether the stroke of the driving cylinder 105 has reached the bottom.

[0027] In a preferred embodiment, a connecting rod center guide 109 is vertically connected to the middle of the transmission rod 102, and the end of the connecting rod center guide 109 away from the transmission rod 102 is connected to the pumping unit. This serves to straighten the transmission rod 102.

[0028] As a preferred embodiment, the transmission rod 102 is provided with a telescopic structure 110 for adjusting its length, which can adjust the length of the transmission rod 102 according to the actual situation, making the present invention more adaptable.

[0029] Alternatively, as an feasible method, the walking beam 101 of the pumping unit and the transmission rod 102 can be fixedly connected by a walking beam retainer, and the drive cylinder 105 can be fixedly installed on the base of the pumping unit by a base retainer.

[0030] Example 3 This embodiment describes the power cylinder switching system 2 based on the above embodiment.

[0031] like Figure 4 As shown, the power cylinder force-converting system 2 includes a hydraulic oil reservoir 201, a reservoir inlet 202, a reservoir outlet 203, a power cylinder 204, a rod-side hydraulic interface 205, a rodless hydraulic interface 206, a position slider 207, and a proximity switch 208. The power cylinder 204 is equipped with a force-changing piston 209. The bottom of the force-changing piston 209 is connected to a piston rod 210. The bottom end of the piston rod 210 passes through the power cylinder 204 and is used to drive the drug cylinder injection system 3 to draw or inject the dewaxing agent. The position slider 207 is installed on the piston rod 210. The proximity switch 208 collects the up and down stroke signals through the movement of the position slider 207. The rod-side hydraulic interface 205 and the rodless hydraulic interface 206 are respectively located in the rod-side and rodless chambers of the power cylinder 204. The rod-side hydraulic interface 205 is connected to the rod-side hydraulic interface 106 via the connecting pipe 111, and the rodless hydraulic interface 206 is connected to the rodless hydraulic interface 107 via the connecting pipe 112. The inlet 202 of the storage tank is connected to the connecting pipe 111, and the outlet 203 of the storage tank is connected to the connecting pipe 112.

[0032] Among them, proximity switch 208 collects whether the stroke of power hydraulic cylinder 204 has reached the bottom.

[0033] Example 4 This embodiment describes the drug liquid cylinder injection system 3 based on the above embodiment.

[0034] like Figure 4 As shown, the drug injection system 3 includes an injection cylinder 301, a discharge port 302, and a suction port 303. An injection piston 304 is installed inside the injection cylinder 301. The injection piston 304 is connected to the bottom end of the piston rod 210. The discharge port 302 is connected to the wellhead 7, and the suction port 303 is connected to the drug storage tank 4.

[0035] For ease of disassembly, preferably, the piston rod 210 includes two rods, which are detachably connected by a connector 211.

[0036] Example 5 This embodiment is an optimized description of the heating and insulation treatment of the drug storage tank 4 based on the above embodiment.

[0037] like Figure 5 As shown, the medicine storage tank 4 is connected to a liquid tank solar thermal collector system 6 for heat preservation and heating of the anti-wax agent.

[0038] Furthermore, the liquid tank solar thermal system 6 includes a thermal controller 601, a thermal collector plate 602, and a heating coil 603; the heating coil 603 is located inside the pharmaceutical storage tank 4 and is connected to the thermal controller 601 and the thermal collector plate 602.

[0039] This invention utilizes a liquid tank solar thermal collection system 6 to effectively cope with operations in extremely cold winter weather by using solar energy collection and heat exchange, and also saves energy.

[0040] Example 6 This embodiment is based on the above embodiment and provides an explanation of the electronic control system 5.

[0041] The electrical control system 5 includes a PLC and an RTU; The PLC controls the opening and closing of the liquid storage tank inlet 202 and the liquid storage tank outlet 203 based on the signal feedback from proximity switch 104 and proximity switch 208. The RTU remotely transmits work data and user commands to the cloud platform via wireless signals, and then the cloud platform processes the data before remotely transmitting it to the client or RTU.

[0042] In addition, the electronic control system 5 determines whether the drive cylinder power take-off system 1 and the power cylinder power conversion system 2 are functioning properly based on the signals from proximity switch 104 and proximity switch 208. Based on the set injection volume and the stroke rate of the drive cylinder 105, the system controls the opening and closing of the solenoid valves at the inlet 202 and outlet 203 of the storage tank to achieve precise control of the injection volume.

[0043] Example 7 Based on the above embodiments, such as Figures 1 to 5 As shown, the present invention also proposes a method for adding anti-wax agent based on the above-mentioned automated system for adding power cleaning agent to oil pumping units, characterized by comprising the following steps: When the power take-off piston 108 of the drive hydraulic cylinder power take-off system 1 moves upward, the power switching piston 209 of the drive power hydraulic cylinder power switching system 2 moves upward and discharges hydraulic oil into the drive hydraulic cylinder 105 of the drive hydraulic cylinder power take-off system 1. At the same time, the upward movement of the power switching piston 209 drives the injection piston 304 of the drug injection system 3 to move upward, drawing the dewaxing agent in the drug storage tank 4 into the injection cylinder 301 of the drug injection system 3. When the power take-off piston 108 moves downward, the power exchange piston 209 moves downward and draws hydraulic oil into the power cylinder 204. At the same time, the downward movement of the power exchange piston 209 drives the injection piston 304 to move downward, injecting the dewaxing agent into the wellhead 7.

[0044] The wax removal and prevention agent injection method of this invention allows for real-time control of parameters such as operating flow rate and temperature, and can be remotely and programmatically set, significantly reducing the labor intensity of workers. Compared with existing conventional processes, this invention can achieve wax removal and prevention without an injection pump, greatly reducing well washing costs and effectively extending pump inspection cycles, thus achieving the goal of improving quality and efficiency.

[0045] The working principle of this invention is as follows: The pumping unit's upward stroke: The pumping unit's walking beam 101 moves upward, and the walking beam retainer fixed to the pumping unit's walking beam 101, together with the transmission rod 102, drives the power take-off piston 108 to move upward. The hydraulic oil in the power cylinder 204 is discharged into the rodless chamber of the drive cylinder 105 through the rodless chamber hydraulic interface 206, the connecting pipe 112, and the rodless chamber hydraulic interface 107. The force-changing piston 209 will drive the piston rod 210 to move upward, and thus the piston rod 210 will synchronously drive the injection piston 304 to move upward, drawing the anti-wax agent into the rodless chamber of the injection cylinder 301.

[0046] Downward stroke of the pumping unit: The walking beam 101 of the pumping unit descends, and the walking beam retainer fixed to the walking beam 101, together with the transmission rod 102, drives the power take-off piston 108 to descend. The hydraulic oil in the rodless chamber of the driving cylinder 105 is discharged into the rodless chamber of the power cylinder 204 through the first rodless chamber hydraulic interface 107, the second connecting pipe 112, and the second rodless chamber hydraulic interface 206. The force-changing piston 209 will drive the piston rod 210 to descend, and the piston rod 210 will synchronously drive the injection piston 304 to descend, so that the anti-wax agent in the rodless chamber of the injection cylinder 301 is injected into the wellhead 7.

[0047] When the oil production well does not require the injection of dewaxing agent: the PLC in the control system controls the opening and closing of the inlet 202 and outlet 203 of the storage tank according to the set amount of dewaxing agent to be injected into the oil well and the stroke of the drive cylinder 105, and drives the power take-off piston 108 to move up or down, so that the hydraulic oil enters or is discharged from the hydraulic oil storage tank 201. At this time, the power cylinder 204 does not move.

Claims

1. An automated system for adding anti-wax additive to a pumping unit, characterized in that, It includes a drive cylinder power take-off system (1), a power cylinder power switching system (2), a drug cylinder injection system (3) and a drug storage tank (4) connected in sequence, and also includes an electronic control system (5); The drive cylinder power take-off system (1) is used to draw power from the hydraulic oil. The power cylinder switching system (2) is used to discharge or draw back hydraulic oil; The agent liquid cylinder injection system (3) is used to draw out or inject the anti-wax agent in the agent storage tank (4) into the oil wellhead (7); The electronic control system (5) is connected to the drive cylinder power take-off system (1), the power cylinder power switching system (2), and the drug cylinder injection system (3) and can control the above systems; The driving hydraulic cylinder power take-off system (1) includes a pumping unit walking beam (101), a transmission rod (102), a position slider (103), a proximity switch (104), a driving hydraulic cylinder (105), a rod chamber hydraulic interface (106), and a rodless chamber hydraulic interface (107). The pumping unit walking beam (101) is connected to the wellhead (7). The top end of the transmission rod (102) is connected to the pumping unit walking beam (101), and the bottom end is connected to the power take-off piston (108) in the drive cylinder (105). The bottom of the drive cylinder (105) is connected to the base of the pumping unit. The position slider (103) is installed on the transmission rod (102). The proximity switch (104) collects the up and down stroke signals through the movement of the position slider (103). The rod-side hydraulic interface (106) and the rodless hydraulic interface (107) are respectively opened in the rod-side and rodless parts of the drive cylinder (105) and are connected to the power cylinder power conversion system (2). A connecting rod center guide (109) is vertically connected to the middle of the transmission rod (102), and the end of the connecting rod center guide (109) away from the transmission rod (102) is connected to the pumping unit. The transmission rod (102) is provided with a telescopic structure (110) for adjusting its length.

2. The automated system for adding anti-wax additive to a pumping unit according to claim 1, characterized in that, The power cylinder force-converting system (2) includes a hydraulic oil reservoir (201), a reservoir inlet (202), a reservoir outlet (203), a power cylinder (204), a rod-type hydraulic interface two (205), a rodless hydraulic interface two (206), a position slider two (207), and a proximity switch two (208). The power cylinder (204) is equipped with a force-changing piston (209). The bottom of the force-changing piston (209) is connected to a piston rod (210). The bottom end of the piston rod (210) passes through the power cylinder (204) and is used to drive the drug injection system (3) to draw or inject the dewaxing agent. The position slider two (207) is installed on the piston rod (210). The proximity switch two (208) collects the up and down stroke signals through the movement of the position slider two (207). The second rod-side hydraulic interface (205) and the second rodless hydraulic interface (206) are respectively located in the rod-side and rodless chambers of the power cylinder (204). The second rod-side hydraulic interface (205) is connected to the first rod-side hydraulic interface (106) via a first connecting pipe (111). The second rodless hydraulic interface (206) is connected to the first rodless hydraulic interface (107) via a second connecting pipe (112). The inlet (202) of the storage tank is connected to the first connecting pipe (111), and the outlet (203) of the storage tank is connected to the second connecting pipe (112).

3. The automated system for adding anti-wax additive to a pumping unit according to claim 2, characterized in that, The drug injection system (3) includes an injection cylinder (301), a discharge port (302), and a suction port (303); the injection cylinder (301) is equipped with an injection piston (304), which is connected to the bottom end of the piston rod (210), the discharge port (302) is connected to the wellhead (7), and the suction port (303) is connected to the drug storage tank (4).

4. The automated system for adding anti-wax additive to a pumping unit according to claim 1, characterized in that, The pharmaceutical storage tank (4) is connected to a liquid tank solar thermal collector system (6) for heat preservation and heating of the anti-wax agent.

5. The automated system for adding anti-wax agent to a pumping unit according to claim 4, characterized in that, The liquid tank solar thermal system (6) includes a thermal controller (601), a thermal plate (602), and a heating coil (603); the heating coil (603) is located inside the drug storage tank (4) and is connected to the thermal controller (601) and the thermal plate (602).

6. The automated system for adding anti-wax agent to a pumping unit according to claim 2, characterized in that, The electrical control system (5) includes a PLC and an RTU; The PLC controls the opening and closing of the liquid storage tank inlet (202) and the liquid storage tank outlet (203) based on the signal feedback from proximity switch one (104) and proximity switch two (208); The RTU remotely transmits work data and user instructions to the cloud platform via wireless signals, and then the cloud platform processes the data before remotely transmitting it to the client or the RTU.

7. A method for adding anti-wax additive to an automated system for adding power cleaning agents to oil pumping units according to any one of claims 1-6, characterized in that, Includes the following steps: When the power take-off piston (108) of the driving hydraulic cylinder power take-off system (1) moves upward, it drives the power switching piston (209) of the power hydraulic cylinder power switching system (2) to move upward and discharges hydraulic oil into the driving hydraulic cylinder (105) of the driving hydraulic cylinder power take-off system (1). At the same time, the upward movement of the power switching piston (209) drives the injection piston (304) of the drug injection system (3) to move upward, drawing the dewaxing agent in the drug storage tank (4) into the injection cylinder (301) of the drug injection system (3). When the power take-off piston (108) moves downward, the power exchange piston (209) moves downward and draws hydraulic oil into the power cylinder (204). At the same time, the downward movement of the power exchange piston (209) drives the injection piston (304) to move downward, injecting the dewaxing agent into the wellhead (7).

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