Skid-mounted dosing device for oil field

Abstract

The utility model relates to a skid-mounted dosing device for an oil field. In the device, a liquid storage tank provided with a liquid level meter and a controller provided with a control panel are fixed at the upper part of a skid-mounted frame; the motor and the booster pump are fixed to the lower portion of the skid-mounted frame, the motor is connected with the booster pump through a coupler, and the booster pump is connected with the liquid storage tank through a liquid inlet pipe. An overflow valve, an outlet control valve and a quick connector are arranged in an outlet pipeline of the booster pump; an overflow pipeline of the overflow valve is connected with the liquid storage tank; the motor and the control panel are connected with a control unit in the controller through cables, and the controller is electrically connected with a mobile power source or a ground control cabinet of a well site. According to the device, various parts are intensively mounted in the skid-mounted frame, and the device has the characteristics of compact volume, convenience in movement, low cost, low power consumption, flexibility, rapidness and the like. The oil field dosing viscosity reduction device can be widely applied to oil field dosing viscosity reduction operation and can also be used as a set of supercharging device, the labor intensity of workers is reduced, and the risk of environmental pollution is reduced.

Description

Technical Field

[0001] The utility model relates to a dosing device for oil production sites in the petroleum industry, in particular to a skid-mounted dosing device for oil fields. Background Art

[0002] Oil well backpressure plays a crucial role in oil production. Its proper control and management is crucial for improving oilfield production efficiency, reducing operating costs, and ensuring sustainable development. The appropriateness of oil well backpressure directly impacts wellhead fluid production and the energy consumption of pumping equipment. Therefore, regular manual injection of chemicals into the wellhead process to reduce backpressure is often necessary on-site. Especially in winter, when ambient temperatures are low, chemical injection plays an even more crucial role in managing high-backpressure wells.

[0003] At present, there are the following problems in the production site's method of adding chemicals to reduce viscosity in oil gathering pipelines or wellbores: 1. There are safety risks in homemade simple chemical dosing equipment: Chemicals are generally added to single wells through the casing gate. For oil wells with casing pressure, closed chemical dosing is required. All injection and production stations use homemade chemical dosing tools, which have different shapes and pose certain safety hazards.

[0004] 2. Traditional dosing methods lead to low dosing efficiency: Traditional dosing methods are inconvenient and inefficient. Due to the rudimentary dosing equipment, dosing is labor-intensive, time-consuming, and labor-intensive. For example, the current dosing method relies on inspectors at metering stations to transport chemicals to the wellhead using paint buckets, plastic jugs, and wheelbarrows. This is not only time-consuming and labor-intensive, but also makes it difficult to ensure dosing quality and efficiency.

[0005] 3. The dosing method is rough, resulting in waste of chemicals and environmental pollution: The traditional dosing method cannot dilute the chemicals when there is no doping water at the wellhead, and the dosing effect cannot be guaranteed. At the same time, it is difficult to add chemicals to the oil wells on a timely and quantitative basis. Moreover, a large amount of foam is generated when the chemicals mix with air. The foam floats to the vent and overflows, causing waste of chemicals and polluting the environment.

[0006] 4. In the extremely cold weather of winter, the simple dosing equipment makes the transportation and dosing of chemicals more difficult: When using traditional dosing tools in the extremely cold weather of winter, the chemicals are partially frozen when they are transported to the well site. During the dosing process, the generated chemical foam freezes quickly, which increases the difficulty of dosing and fails to achieve the expected effect.

[0007] In order to solve the above problems, the on-site staff has done a lot of work. After searching, the following patent technology is also found: China Patent Authorization Announcement No.: CN202012337U discloses an oil wellhead dosing device. The above utility model includes a dosing port, a safety valve, a pressure gauge, a vent stop valve, a vent elbow, a drug storage tank, a flow controller, a wellhead casing spool, a short joint, an observation stop valve, a throttle valve, and a drug injection stop valve. The upper part of the drug storage tank is installed and connected with the dosing port and the drug injection stop valve, a pressure gauge, a safety valve and a vent stop valve. The lower part of the drug storage tank is installed and connected with the flow controller and the throttle valve in sequence. The throttle valve is connected to the short joint. The throttle valve is connected to the upper part of the drug storage tank and the drug injection stop valve and the dosing port installed and connected to the drug storage tank through an air pipeline. The above-mentioned utility model has the characteristics of smoothly injecting wax removal agents, anti-corrosion agents, viscosity reducers and other chemical agents into the annular space of the oil casing, continuously dripping or flowing into the annular space of the oil casing with a controllable flow rate under no-power conditions, automatic pressure relief protection, safe operation, installation, disassembly, and simple use. It is widely used in the injection process of wax removal, anti-corrosion, viscosity reducer and other agents in oil wells.

[0008] However, the above patented technology still has the following defects: when the device is unpowered, the controllable flow rate continuously drips or flows into the annular space of the casing, which makes it difficult to ensure normal dosing in winter when the temperature is low and the fluidity of the agent is poor; and because the unpowered dosing relies on gravity for dosing, the pressure difference between the wellhead and the bottom of the well or the wellhead pressure fluctuation will lead to unstable dosing effect.

[0009] Chinese patent authorization announcement number CN206769879U discloses a multi-purpose expandable wellhead dosing device, the dosing mechanism includes at least one drug storage tank and a dosing pump, a liquid level sensor is provided on the top of the drug storage tank, a heating belt is wrapped around the outside of the drug storage tank, a temperature sensor is installed on the bottom of the drug storage tank, and a drug feed pipe is provided at the bottom of the drug storage tank, and a drug feed valve is installed on the drug feed pipe; the drug feed pipes are converged into an injection pipe, and the injection pipe is connected to the dosing pump, the injection pipe is provided with a water inlet pipe, and the water inlet pipe is installed on the water inlet valve; the outlet of the dosing pump is connected to at least one drug discharge pipe, and the drug discharge pipe is installed on the drug discharge valve; the heating belt, the drug feed valve, the water inlet valve, the dosing pump and the drug discharge valve are all provided with relays, and the controller is respectively connected to the liquid level sensor, the temperature sensor, the touch screen and the relay.

[0010] The above-mentioned utility model realizes the on-site drug addition method of single-well single drug, single-well multiple drugs, and multiple-well multiple drugs, and has strong scalability. However, the above-mentioned patented technology still has the following defects: the device structure is complex, the manufacturing cost is high, and the investment cost is too high; and the above-mentioned device contains many components and functions, which leads to an increase in subsequent installation and maintenance costs.

[0011] Chinese Patent Authorization Announcement No. CN109322641A discloses a special dosing vehicle for oil and gas fields and its working method, which is used to solve the problems in the prior art that liquid reagents added during mining are prone to leakage and the dosing equipment takes up too much vehicle space. Specifically, it includes: the vehicle body provides a drive system, the drive system is connected to the input shaft of the axial piston pump, the inlet of the axial piston pump is connected to the vehicle-mounted storage tank, and the outlet of the axial piston pump is connected to the high-pressure hose; the drive system includes: the gearbox countershaft of the two-wheel drive vehicle chassis is connected to the axial piston pump through a coupling; or, the gearbox countershaft of the two-wheel drive vehicle chassis is connected to the transfer case, and the transfer case countershaft is connected to the axial piston pump through a coupling; or, the transfer case countershaft of the four-wheel drive vehicle chassis is connected to the axial piston pump through a coupling. The beneficial effect is to effectively achieve safe, efficient and environmentally friendly dosing work in oil and gas fields, and the degree of automation and continuous operation rate are also greatly improved compared with previous devices.

[0012] However, the above patented technology still has the following defects: complex structure, high equipment price, high maintenance cost; limited application under complex road conditions and complex operation.

[0013] Chinese patent authorization announcement number CN218293557U discloses a multifunctional wellhead dosing system, which includes a central processing unit module, a low-pressure manifold module, a high-pressure manifold module, a chemical stirring module and a chemical high-pressure manifold module. The central processing unit module is electrically connected to the high-pressure manifold module, the chemical stirring module and the chemical high-pressure manifold module respectively, the low-pressure manifold module is connected to the high-pressure manifold module, and the high-pressure manifold module, the chemical high-pressure manifold module and the chemical stirring module are connected in sequence. The above-mentioned utility model adopts a method of mutual cooperation between the various modules to meet the actual operation needs of multiple processes in the well site.

[0014] However, the above patented technology still has the following defects: the device structure is complex, and on-site installation requires one backup and one use, resulting in high cost investment and high maintenance costs; and it is impossible to achieve single-well mobile dosing, and lacks flexibility and maneuverability during application. Summary of the Invention

[0015] The purpose of this utility model is to provide a skid-mounted dosing device for oilfields, which can solve the various problems caused by the crude homemade dosing equipment currently used by grassroots injection and production units. It also solves the high manufacturing and maintenance costs of existing traditional dosing methods and dosing devices. It can reduce the investment cost of dosing equipment, improve dosing efficiency, and reduce the labor intensity of employees.

[0016] The technical solution of the utility model is: a skid-mounted dosing device for oil fields, comprising a liquid storage tank, a controller and a booster pump, wherein: the liquid storage tank provided with a liquid level gauge and the controller provided with a control panel are fixed on the upper part of the skid-mounted frame; the motor and the booster pump are fixed on the lower part of the skid-mounted frame, the motor and the booster pump are connected by a coupling, and the booster pump and the liquid storage tank are connected by a liquid inlet pipe; an overflow valve, an outlet control valve and a quick connector are installed in the outlet pipeline of the booster pump, and the overflow pipeline of the overflow valve is connected to the liquid storage tank; the motor and the control panel are connected to the control unit in the controller through cables, and the controller is electrically connected to a mobile power supply or a ground control cabinet at the well site.

[0017] Preferably, the skid-mounted frame is a table-type frame, and the upper table is provided with a hole for connecting pipelines, and the lower table is fixed with an electric motor and a booster pump.

[0018] Preferably, a liquid collecting trough is provided below the lower table in the skid-mounted frame, and a liquid flow hole is provided between the lower table and the liquid collecting trough.

[0019] Preferably, the relief valve is a direct-acting or pilot-operated pressure regulating valve.

[0020] Preferably, a pressure measuring tube is connected between the overflow valve and the outlet control valve in the outlet pipeline via a three-way pipe, and the pressure measuring tube is connected to a pressure gauge fixed in the controller.

[0021] Preferably, the pressure gauge is an electric contact type pressure gauge, and the pressure sensor in the pressure gauge is connected to the control unit in the controller via a cable.

[0022] Preferably, a breathing cap is installed in the liquid filling port on the top of the liquid storage tank.

[0023] Preferably, a safety valve is connected between the overflow valve and the pressure measuring tube in the outlet pipeline, and the control pressure of the safety valve is set at 7MPa-9MPa.

[0024] Preferably, the liquid storage tank is further provided with an electric heating component, which is connected to the temperature controller in the control panel and connected to the control unit in the controller through the temperature controller; the electric heating component includes but is not limited to an electric heater and an electric heating belt.

[0025] Preferably, a frequency converter is connected between the motor and the control unit in the controller.

[0026] Compared with the existing technology, the use effect of the utility model is: the utility model is suitable for application scenarios such as gathering and transportation pipelines and wellbore dosing and viscosity reduction at oil field sites, and is a skid-mounted dosing device with a high degree of automation.

[0027] This device uses a mobile power source or an on-site ground control cabinet to power the generator, and the control unit in the controller controls the start and stop of the motor to achieve normal operation of the booster pump. When the booster pump is working, the chemical in the liquid storage tank enters the booster pump through the liquid inlet pipe. The pressurized liquid is transported to the outlet pipeline and is controlled by the overflow valve, safety valve, and outlet control valve connected to the outlet pipeline. The dosage set by the control panel and control unit in the controller is accurately discharged to the gate, casing gate, or tubing gate in the wellhead process, achieving wellhead dosing.

[0028] The displacement and pressure of the added agent in this device can be adjusted: the displacement and pressure are adjusted by adjusting the speed of the motor through the frequency converter. At the same time, a relief valve with a pressure regulating function is installed in the outlet pipeline. When the pressure of the outlet pipeline does not exceed the pressure set by the relief valve, the liquid is pressurized and output through the outlet pipeline; when the pressure in the outlet pipeline is too high and exceeds the set pressure of the relief valve, the overflow valve of the relief valve opens and flows back into the liquid storage tank through the overflow pipeline. The overpressure signal is transmitted to the controller through the safety valve, the power supply of the whole device is automatically cut off, and the shutdown protection mode is started.

[0029] The device weighs approximately 35 kg and can be carried by one person directly onto a three-wheeled vehicle used by patrol officers. Once transported to the site, it is connected to the wellhead gate where dosing is required using a quick connector. The required dosage is calculated using the scale on the device's level gauge. The gate is then opened, and relevant parameters such as the motor speed are set on the control panel. Dosing is completed with a single button press.

[0030] This device centrally mounts all components on a skid-mounted frame. It is compact, easy to move, and quick and easy to use. It features low cost, low power consumption, flexibility, and a high degree of automation. It can be widely used in oilfield dosing and viscosity reduction operations. It can also function as a pressure booster, improving construction efficiency, reducing labor intensity, and minimizing the risk of environmental pollution. The device's simple structure and low manufacturing cost save material input and reduce production costs.

[0031] The device can be powered by a mobile power supply fixed in a skid-mounted frame, which can avoid being connected to the oil field production power supply and thus avoid interference with normal production when the device is connected to the power supply. The device can work independently outdoors without relying on production power.

[0032] Compared with traditional dosing methods, this new device can solve the problems currently faced by grassroots oil production units, such as the inability to dilute when there is no doping water at the wellhead, the inability to automatically dosing the drug at a fixed time and quantity, and the difficulty in ensuring the dosing effect. This can improve the current level of management of oil wells by grassroots oil production units. The use of this device can also solve the problem of increased difficulty in transporting and dosing drugs caused by extremely cold weather in winter.

[0033] In addition to being used for adding medicines, the utility model can also be used as a fixed small-displacement booster pump for emergency use, and can also be used as a movable tool pump. It has a wide range of uses and significant effects in grassroots oil production units for various high-pressure liquid occasions that require short-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 It is a structural diagram of this device.

[0036] Figure 2 yes Figure 1 Left view of .

[0037] Figure 3 yes Figure 2 Expanded diagram of the middle export pipeline structure diagram.

[0038] In the figure: liquid level gauge 1, temperature controller 2, pressure gauge 3, control panel 4, controller 5, coupling 6, motor 7, liquid collecting tank 8, breathing cap 9, liquid storage tank 10, skid-mounted frame 11, overflow pipeline 12, pressure measuring tube 13, liquid inlet pipe 14, safety valve 15, overflow valve 16, booster pump 17, outlet pipeline 18, outlet control valve 19, quick connector 20, electric heating component 21, mobile power supply 22. DETAILED DESCRIPTION

[0039] The accompanying drawings are for reference and illustration purposes only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0042] See also Figure 1 - Figure 3 A skid-mounted dosing device for oil fields includes a liquid storage tank 10, a controller 5 and a booster pump 17, wherein: the liquid storage tank 10 provided with a liquid level gauge 1 and the controller 5 provided with a control panel 4 are fixed to the upper part of the skid-mounted frame 11; the motor 7 and the booster pump 17 are fixed to the lower part of the skid-mounted frame 11, the motor 7 and the booster pump 17 are connected by a coupling 6, and the booster pump 17 and the liquid storage tank 10 are connected by a liquid inlet pipe 14; an overflow valve 16, an outlet control valve 19 and a quick connector 20 are installed in the outlet pipeline 18 of the booster pump 17, and the overflow pipeline 12 of the overflow valve 16 is connected to the liquid storage tank 10; the motor 7 and the control panel 4 are connected to the control unit in the controller 5 through a cable, and the controller 5 is electrically connected to a mobile power supply 22 or a ground control cabinet at the well site.

[0043] The utility model is characterized by the installation of the motor 7, booster pump 17, relief valve 16, and the liquid inlet pipe 14, outlet pipeline 18, and controller 5 associated with the liquid storage tank 10 within a skid-mounted frame 11. This design features a simple structure, small and compact size, light weight, and ease of movement, making transportation and handling quick and easy. After being transported to the dosing site via a small transport vehicle, the device is connected to a power source, connected to the gate in the wellhead process using a quick connector 20, the outlet control valve 19 opened, the dosing program set via the control panel 4, and the operation buttons on the control panel 4 activated with one click, allowing for immediate use and dosing.

[0044] The utility model allows the preparation of liquid medicine at the well site, resolving the problem of traditional dosing methods that prevent dilution without dosing water at the wellhead. The medicine can be added to the oil well in a timely and quantitative manner during on-site preparation at the well site, overcoming the drawback of traditional dosing methods that lack guaranteed effectiveness. It also avoids the risk of environmental pollution and protects the environment. It also avoids the waste of medicine and environmental pollution caused by the large amount of foam generated when the medicine mixes with air during traditional dosing methods, which then floats to the vent of the traditional dosing barrel and overflows.

[0045] This utility model features low manufacturing costs, low power consumption, flexibility, and a high degree of automation. It can be widely used in various oilfield applications, such as dosing and viscosity reduction, and pressure boosting, reducing operational costs. The skid-mounted device simplifies operation, improves efficiency, reduces labor intensity, minimizes chemical waste, and saves material costs.

[0046] Based on the above embodiment 1, the present invention also has the following embodiments:

[0047] A preferred embodiment: the skid-mounted frame 11 is a table-type frame, and the upper table is provided with a hole for connecting pipelines, and the lower table is fixed with the motor 7 and the booster pump 17.

[0048] In a preferred embodiment, a liquid collecting trough 8 is provided below the lower table of the skid-mounted frame 11, and a liquid flow hole is provided between the lower table and the liquid collecting trough 8. The liquid collecting trough 8 can be used as a liquid collection container in the event of liquid leakage from the liquid inlet pipe 14 and the overflow line 12, thereby ensuring clean construction and protecting the environment.

[0049] In a preferred embodiment, the relief valve 16 is a direct-acting or pilot-operated pressure-regulating valve, capable of timely adjusting the pressure within the device. When the pressure in the outlet pipeline 18 does not exceed the set pressure of the relief valve 16, the liquid is discharged at a high pressure and boosted pressure through the outlet pipeline 18 and the liquid inlet pipe 14. When the pressure in the outlet pipeline 18 is too high, exceeding the set pressure range of the relief valve 16, the overflow port of the relief valve 16 opens, and the liquid flows back into the liquid storage tank 10 through the overflow line 12.

[0050] In a preferred embodiment, a pressure measuring tube 13 is connected between the relief valve 16 and the outlet control valve 19 in the outlet pipeline 18 via a tee pipe. The pressure measuring tube 13 is connected to a pressure gauge 3 fixed to the controller 5. The pressure of the liquid in the outlet pipeline 18 can be displayed on the dial of the pressure gauge 3 in the control panel 4, making it clear to the operator at a glance.

[0051] In a preferred embodiment, the pressure gauge 3 is an electric contact type pressure gauge, and the pressure sensor in the pressure gauge 3 is connected to the control unit in the controller 5 via a cable. The pressure gauge 3 has an overpressure detection function, so that when the pressure exceeds the set pressure of the pressure gauge 3, the pressure gauge 3 automatically transmits a signal to the controller 5, and the controller 5 automatically cuts off the power supply of the entire device and activates the shutdown protection mode, providing an additional layer of protection for the safe operation of the device.

[0052] A preferred embodiment: a breathing cap 9 is installed in the liquid filling port on the top of the liquid storage tank 10, which ensures the convenience of adding liquid to the liquid storage tank 10 and is connected to the atmosphere.

[0053] A preferred embodiment: a safety valve 15 is further connected between the overflow valve 16 in the outlet pipeline 18 and the pressure measuring tube 13. The control pressure of the safety valve 15 is set at 7MPa-9MPa, which can further improve the operational safety of the device.

[0054] A preferred embodiment: the liquid storage tank 10 is further provided with an electric heating component 21, the electric heating component 21 is connected to the temperature controller 2 in the control panel 4 and is connected to the control unit in the controller 5 through the temperature controller 2; the electric heating component 21 includes but is not limited to an electric heater and an electric heating belt.

[0055] In a preferred embodiment, a frequency converter is connected between the motor 7 and the control unit in the controller 5 , and the frequency converter is used to control the rotation speed of the motor 7 .

[0056] When the device is in use, first open the breathing cap 9 to add the corresponding liquid, and then turn on the power to start use.

[0057] When the liquid in outlet pipeline 18 exceeds pressure, the high-pressure liquid flows through the overflow port of relief valve 16 into overflow pipe 12 and then back into liquid storage tank 10. A pressure measuring tube 13 is also installed in outlet pipeline 18 to direct the outlet liquid pressure to pressure gauge 3, which is then displayed on control panel 4. When pressure gauge 3 detects an overpressure condition, it automatically transmits a signal to controller 5, which automatically shuts off the power to the device, shutting it down and activating overpressure protection mode.

[0058] In order to cope with various environmental conditions of oil field exploitation, especially when adding chemicals in winter, an electric heating component 21 is added to the liquid storage tank 10 to ensure the fluidity of the liquid in the liquid storage tank 10 and improve the liquid flow efficiency.

[0059] The liquid level meter 1 displays the liquid level of the medicine in the liquid storage tank 10, so that the amount of liquid added in the liquid storage tank 10 can be seen when adding liquid. The temperature controller 2 can control the heating temperature of the liquid in the liquid storage tank 10 when heating the liquid.

[0060] When the device leaks after long-term use, a corresponding liquid collecting tank 8 is provided at the bottom of the skid-mounted frame 11 to collect the leaked liquid. The skid-mounted frame 11 is a necessary structure for supporting components such as the liquid storage tank 10 and the controller 5.

[0061] This device mainly has the following two working modes: Normal pressurized discharge mode: Under normal circumstances, the booster pump 17 pressurizes the liquid in the liquid storage tank 10, and pressurizes it through the outlet pipeline 18, the overflow valve 16, the safety valve 15, the outlet control valve 19 and the quick connector 20 to the high-pressure liquid occasion required on site.

[0062] Overpressure protection mode: When the liquid pressure in outlet pipeline 18 is too high, the liquid will overflow through the safety overflow port of overflow valve 16 and overflow pipeline 12, flowing back into liquid storage tank 10. If the liquid in outlet pipeline 18 continues to overpressure, safety valve 15 will also operate when the set safety pressure value is reached, protecting the device. If the safety valve 15 fails to function or does not operate, it can also output a signal through pressure gauge 3 to stop controller 5 and automatically shut down the device. The above overpressure protection function better ensures the safe operation of the device.

[0063] The embodiments described above are merely typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection is not limited to the above description.

Claims

1. A skid-mounted dosing device for oil fields, comprising a liquid storage tank, a controller and a booster pump, characterized in that: A liquid storage tank equipped with a liquid level gauge and a controller equipped with a control panel are fixed to the upper part of the skid-mounted frame; an electric motor and a booster pump are fixed to the lower part of the skid-mounted frame, the electric motor and the booster pump are connected by a coupling, and the booster pump and the liquid storage tank are connected by a liquid inlet pipe; an overflow valve, an outlet control valve and a quick connector are installed in the outlet pipeline of the booster pump, and the overflow pipeline of the overflow valve is connected to the liquid storage tank; the electric motor and the control panel are connected to the control unit in the controller through cables, and the controller is electrically connected to a mobile power supply or a ground control cabinet at the well site.

2. The skid-mounted dosing device for oil fields according to claim 1, characterized in that: The skid-mounted frame is a table-type frame, the upper table is provided with a connecting pipeline through hole, and the lower table is fixed with an electric motor and a booster pump.

3. The skid-mounted dosing device for oil fields according to claim 2, characterized in that: A liquid collecting trough is provided below the lower table in the skid-mounted frame, and a liquid flow hole is provided between the lower table and the liquid collecting trough.

4. The skid-mounted dosing device for oil fields according to claim 1, characterized in that: The relief valve is a direct-acting or pilot-operated pressure regulating valve.

5. A skid-mounted dosing device for oil fields as claimed in claim 4, characterized in that A pressure measuring tube is connected between the overflow valve and the outlet control valve in the outlet pipeline via a three-way pipe, and the pressure measuring tube is connected to a pressure gauge fixed in the controller.

6. The skid-mounted dosing device for oil fields according to claim 5, characterized in that: The pressure gauge is an electric contact type pressure gauge, and the pressure sensor in the pressure gauge is connected to the control unit in the controller through a cable.

7. The skid-mounted dosing device for oil fields according to claim 1, characterized in that: A breathing cap is arranged in the liquid filling port on the top of the liquid storage tank.

8. The skid-mounted dosing device for oil fields as claimed in claim 6, wherein A safety valve is also connected between the overflow valve and the pressure measuring tube in the outlet pipeline, and the control pressure of the safety valve is set at 7MPa-9MPa.

9. The skid-mounted dosing device for oil fields according to claim 1, characterized in that: The liquid storage tank is also provided with an electric heating component, which is connected to the temperature controller in the control panel and connected to the control unit in the controller through the temperature controller; the electric heating component includes but is not limited to an electric heater and an electric heating belt.

10. The skid-mounted dosing device for oil fields according to claim 1, characterized in that: A frequency converter is connected between the motor and a control unit in the controller.

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