High-precision oil-water interface automatic measurement and control device and method

Abstract

The invention provides a high-precision oil-water interface automatic measurement and control device and method.The high-precision oil-water interface automatic measurement and control device comprises a servo liquid level instrument, a density probe and a controller, the servo liquid level instrument is connected with the density probe, the servo liquid level instrument is in electric signal connection with the controller, and the servo liquid level instrument drives the density probe to move up and down under the control of the controller; the density probe is in electric signal connection with the controller, and the controller records the height and density in each measurement according to the set measurement height resolution; the controller is electrically connected with the dosing device and the drain valve, the dosing device is arranged above the settling tank, the drain valve is arranged at the bottom of the settling tank, and the dosing device is used for dosing the settling tank after receiving a dosing signal of the controller so as to regulate and control the thickness of an oil-water interface. The controller controls the servo motor to rotate to drive the density probe to move up and down in the settling tank, data processing is carried out on the recorded height and the corresponding density according to the set measurement height resolution, the oil-water interface is accurately measured, and the data repeatability is good.

Description

Technical Field

[0001] This invention belongs to the field of crude oil dehydration and gathering technology, specifically relating to a high-precision automatic measurement and control device and method for oil-water interface. Background Technology

[0002] In the crude oil dehydration and gathering process, accurate measurement of the dynamic oil-water interface in crude oil storage tanks is crucial for controlling the water content of the purified oil and ensuring the precision of the integrated storage system. Because oil and water in crude oil storage tanks can form oil-water emulsions of various forms, an emulsion zone forms at the interface. The width and state of this emulsion zone are randomly variable, and ordinary interface meters cannot accurately measure the oil-water interface and the width of the emulsion zone. Furthermore, the large variations in the oil-water interface in settling tanks, coupled with delayed monitoring and intervention, and operators' indiscriminate chemical dosing, can lead to production disruptions and yield losses. In addition, the emulsion zone is a random and complex transition zone; parameters such as water content, viscosity, asphalt concentration, mineral content, interface elasticity, and pressure within the crude oil settling tank all affect its stability. For these reasons, a reliable method for accurately detecting the oil-water interface in crude oil storage tanks at oilfield integrated stations has remained elusive in the crude oil production process.

[0003] Currently, the main technologies used domestically and internationally include capacitive oil-water interface detectors, float-type liquid interface detectors, differential pressure liquid interface detectors, ultrasonic / radar interface detectors, magnetostrictive liquid interface detectors, X-ray interface detectors, and fiber optic interface detectors.

[0004] Patent CN202020386168.1 discloses a "microwave-type oil-water interface detector," comprising a support plate for connecting with a pre-reserved detection port on an oil tank. At least one set of dipsticks is vertically arranged on the lower side of the support plate, and a main unit is located on the upper side of the support plate, electrically connected to the dipstick set. The dipstick set includes at least one dipstick; when there are multiple dipsticks, they are arranged in a vertical array, with adjacent dipsticks connected end-to-end. This solution is based on the principle of microwave dielectric constant measurement. By accurately measuring the capacitive changes of oil, water, and oil-water mixture layers, it inversely calculates the changes in electrical parameters of each medium layer, developing a detection device capable of measuring the oil-water interface and achieving the measurement of the oil-water interface.

[0005] However, this method and the other detection methods mentioned above are all static probe measurements, which cannot accurately detect the dynamically changing interface and emulsion layer thickness inside the crude oil settling tank. The application effect is not very good, and it cannot perfectly solve the problem of high-precision measurement and control of the oil-water interface in the settling tank. Summary of the Invention

[0006] The purpose of this invention is to provide a high-precision automatic measurement and control device for the oil-water interface, which solves the problems of large measurement error and poor repeatability of measurement data in the traditional measurement of the dynamic oil-water interface in settling tanks during the crude oil dehydration and gathering and transportation process in oil fields.

[0007] The purpose of this invention is to provide a high-precision automatic measurement and control method for oil-water interface, which can replace manual measurement on tanks, significantly reducing the labor intensity and safety risks for employees.

[0008] Therefore, the technical solution provided by the present invention is as follows: A high-precision automatic oil-water interface measurement and control device includes a servo level gauge, a density probe, and a controller. The servo level gauge and the density probe are connected, and the servo level gauge and the controller are electrically connected. Under the control of the controller, the servo level gauge drives the density probe to move up and down. The density probe and the controller are electrically connected. The controller records the height and density at each measurement according to the set measurement height resolution. The controller is electrically connected to a dosing device and a drain valve. The dosing device is located above the settling tank, and the drain valve is located at the bottom of the settling tank. After receiving the dosing signal from the controller, the dosing device adds chemicals to the settling tank to regulate the thickness of the oil-water interface. The servo level gauge includes a servo motor, a winch, and an encoder. The servo motor is connected to the winch via gears. The encoder is mounted on the servo motor and is electrically connected to the controller. A flat wire is wound around the winch, and the other end of the flat wire is connected to a density probe.

[0009] A heated oil removal tank and an oil drain valve are provided between the servo level gauge and the density probe, and the bottom of the heated oil removal tank and the oil drain valve are connected.

[0010] The servo level gauge includes a servo motor, a winch, and a magnetic counter. The servo motor is connected to the winch via gears. The magnetic counter is mounted on the winch, and a flat wire is wound around the winch. Magnetic dots are provided on the flat wire. The magnetic counter and magnetic dots cooperate with each other. The magnetic counter is electrically connected to the controller. The flat wire is also connected to a multi-functional float and a boundary probe. The flat wire is electrically connected to the controller.

[0011] One end of the heating and degreasing tank is connected to the servo level gauge via a flange, and the other end of the heating and degreasing tank is connected to the top flange of the settling tank. The oil drain valve is connected to the top flange via a flange.

[0012] The flat wire includes a protective sheath, an insulating braided sheath, a shielding braided layer, an outer insulating sheath, a signal line, and a steel wire rope. The shielding braided layer tightly covers the inner surface of the protective sheath, the insulating braided sheath fills the cavity between the signal line and the protective sheath, and the steel wire rope is located on both sides of the outer insulating sheath.

[0013] The heated oil removal tank is equipped with a heating device and an oil scraping device. The heating device is used to heat the crude oil adhering to the flat wire, and the oil scraping device is used to scrape off the crude oil adhering to the flat wire.

[0014] The settling tank is connected to a waveguide sleeve at the top, which extends downward into the settling tank, and the density probe moves up and down inside the waveguide sleeve.

[0015] A high-precision automatic measurement and control method for oil-water interface, employing a high-precision automatic measurement and control device for oil-water interface, includes the following steps: Step 1) The on-site SCADA platform or the field manually sends a measurement command to the controller. After receiving the measurement command, the controller sends a signal to the servo motor, and the servo motor rotates to drive the density probe to move towards the bottom of the settling tank. Step 2) The density probe measures the medium density in real time and sends it to the controller. The magnetic counter measures the number of magnetic points in real time and sends it to the controller to calculate the vertical height. The controller records the height of the measurement point and the corresponding density. Meanwhile, the controller receives moisture content data sent by the multi-functional float in real time; Step 3) After the density meter moves to the bottom of the settling tank, the controller controls the servo motor to rotate, which drives the density probe to move upward. Step 4) The controller averages the height and corresponding density of the measurement points according to the set measurement height resolution, and combines the water content data to obtain the position and thickness of the oil-water interface; where the water content is greater than 95%, it is a water layer, and the water content is less than 5%, it is an oil layer. Step 5) When the controller determines that the thickness of the oil-water interface is greater than the set upper limit, the controller sends a signal to the dosing device to start dosing, thereby regulating the thickness of the oil-water interface.

[0016] Step 3) During the upward movement of the density meter, the oil on the flat line is heated and scraped off by the heating and degreasing tank between the servo level gauge and the density probe, and then stored in the heating and degreasing tank. After the measurement is completed, the drain valve set below the heating and degreasing tank is opened to discharge the oil stored in the heating and degreasing tank into the settling tank.

[0017] The beneficial effects of this invention are: The high-precision oil-water interface automatic measurement and control device provided by this invention controls the rotation of a servo motor through a controller to drive the density probe to move up and down in the settling tank, and processes the recorded height and corresponding density data according to the set measurement height resolution to accurately measure the oil-water interface with good data repeatability.

[0018] This invention, through precise measurement of the oil-water interface, can control the start and stop of the dosing device by comparing the thickness of the oil-water interface with a set range, thereby precisely regulating the thickness of the oil-water interface.

[0019] This invention significantly reduces the labor intensity of employees, improves data accuracy, and realizes intelligent management of settling tanks. It has certain guiding significance in crude oil settling and separation and has high application value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the measurement principle of the servo level gauge of this invention; Figure 2 This is a schematic diagram of one embodiment of the present invention; Figure 3 This is a schematic diagram of the flat wire structure of the present invention.

[0021] In the diagram: 1. Servo level gauge; 2. Heated oil removal tank; 3. Oil drain valve; 4. Tank top mounting flange; 5. Density probe; 6. Waveguide sleeve; 7. Protective sleeve; 8. Insulating braided sleeve; 9. Shielding braided layer; 10. Signal line; 11. Flat wire; 12. External insulating sheath; 13. Servo motor; 14. Controller; 15. Encoder; 16. Winch. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0024] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0025] Example 1 This embodiment provides a high-precision automatic oil-water interface measurement and control device, including a servo level gauge 1, a density probe 5, and a controller 14. The servo level gauge 1 and the density probe 5 are connected, and the servo level gauge 1 and the controller 14 are electrically connected. Under the control of the controller 14, the servo level gauge 1 drives the density probe 5 to move up and down. The density probe 5 and the controller 14 are electrically connected. The controller 14 records the height and density at each measurement according to the set measurement height resolution. The controller 14 is electrically connected to a dosing device and a drain valve. The dosing device is located above the settling tank, and the drain valve is located at the bottom of the settling tank. After receiving the dosing signal from the controller 14, the dosing device adds chemicals to the settling tank to regulate the thickness of the oil-water interface.

[0026] The density probe 5 is a high-precision density and temperature measurement device. When used in combination with a servo level gauge, it can measure the temperature and density at various height points in a liquid. It can also measure the height of the oil-water interface and other parameters through its built-in probe. The density probe 5, with its built-in probe at the bottom, enables high-precision measurement of the oil-water interface height and tank bottom settling within the tank. This also prevents the probe body from adhering to oil sludge from the tank bottom, thus avoiding errors in parameter measurement. The density probe, through its built-in high-precision density meter, can directly measure the liquid density at its location. It can also be used to measure the temperature of the oil within the tank, the oil-water interface height, and the tank bottom height. Density accuracy: Accuracy class is ±0.3kg / m³ 3 or ±0.5kg / m 3 Density measurement range: 0~1000kg / m³ 3 Temperature accuracy: ±0.1℃ (-5℃~+45℃); ±0.3℃ (-200℃~+60℃) Combined with a servo level gauge, it measures the oil-water interface height and tank bottom settlement. Oil-water interface accuracy: ±5.0mm When used in combination with a servo level gauge, it can measure the density and temperature at different heights in a liquid, enabling automatic measurement of the average density and average temperature of the oil in the tank. The high-precision oil-water interface automatic measurement and control device provided by the present invention controls the servo motor to rotate through the controller 14, which drives the density probe 5 to move up and down in the settling tank. The device processes the recorded height and corresponding density data according to the set measurement height resolution, and accurately measures the oil-water interface with good data repeatability. Example 2 Based on Example 1, this example provides a high-precision automatic measurement and control device for the oil-water interface, such as... Figure 1 As shown, the servo level gauge 1 includes a servo motor 13, a winch 16, and an encoder 15. The servo motor 13 is connected to the winch 16 via gears. The encoder 15 is mounted on the servo motor 13 and is electrically connected to the controller 14. A flat wire is wound on the winch 16, and the other end of the flat wire is connected to the density probe 5.

[0027] The servo motor receives instructions from the controller 14 and drives the winch 16 to rotate; the flat cable is wound on the winch 16; the distance of each movement is converted into a pulse signal by the encoder 15 and recorded in the controller 14 to achieve accurate vertical height recording.

[0028] Example 3 Based on Example 1, this example provides a high-precision automatic measurement and control device for the oil-water interface, such as... Figure 2 As shown, a heated oil removal tank 2 and an oil drain valve 3 are provided between the servo level gauge 1 and the density probe 5, and the bottom of the heated oil removal tank 2 and the oil drain valve 3 are connected.

[0029] After the measurement begins, the heating and degreasing tank 2 operates to prevent crude oil adhering to the measuring line connecting the servo level gauge 1 and the density probe 5 from condensing upon cooling. The crude oil is then scraped off and stored in the heating and degreasing tank 2. After the measurement is completed, the drain valve 3 is opened, and the oil stored inside the heating and degreasing tank 2 is discharged into the settling tank.

[0030] Example 4 Based on Embodiment 1, this embodiment provides a high-precision automatic measurement and control device for oil-water interface. The servo level gauge 1 includes a servo motor 13, a winch 16, and a magnetic counter. The servo motor 13 is connected to the winch 16 via gears. The magnetic counter is mounted on the winch 16, and a flat wire is wound on the winch 16. Magnetic dots are provided on the flat wire, and the magnetic counter cooperates with the magnetic dots. The magnetic counter is electrically connected to the controller 14. The flat wire is also connected to a multifunctional float and an interface probe, and the flat wire is electrically connected to the controller 14.

[0031] The flat wire is used for data transmission. The upper end of the density probe 5 is connected to the servo motor via the flat wire, while the lower end is suspended. The density probe 5 has an internal cavity, which moves vertically within the settling tank during measurement, driven by the flat wire. The density probe 5 utilizes the principle of acoustic resonance to measure the density of the medium surrounding the cavity. When the density probe 5 is not in measurement mode, it is moved to the space between the liquid level at the top of the settling tank and the top of the tank to avoid prolonged submersion in crude oil, which could cause instrument corrosion or condensation and affect the measurement results.

[0032] A multi-functional float and interface probe are used to measure moisture content, and their results are mutually corrected. A temperature sensor is also connected to the flat cable.

[0033] Example 5 Based on Example 3, this example provides a high-precision automatic measurement and control device for the oil-water interface, such as... Figure 2 As shown, one end of the heating oil removal tank 2 is connected to the servo level gauge 1 via a flange, and the other end of the heating oil removal tank 2 is connected to the tank top mounting flange 4 on the top of the settling tank. The oil drain valve 3 and the tank top mounting flange 4 are connected via a flange.

[0034] The settling tank is connected to a waveguide sleeve 6 at the top, which extends downward into the settling tank. The density probe 5 moves up and down inside the waveguide sleeve 6.

[0035] The density probe 5 moves within the waveguide sleeve 6, which can isolate the disturbance caused by the turbulence of the liquid in the settling tank, ensuring that the density probe 5 does not swing and guaranteeing the accuracy of the measurement data.

[0036] Example 6 Based on Example 4, this example provides a high-precision automatic measurement and control device for the oil-water interface, such as... Figure 3 As shown, the flat wire includes a protective sleeve 7, an insulating braided sleeve 8, a shielding braided layer 9, an outer insulating sheath 12, a signal line 10, and a steel wire rope. The shielding braided layer 9 tightly covers the inner surface of the protective sleeve 7. The insulating braided sleeve 8 fills the cavity between the signal line 10 and the protective sleeve 7. The steel wire rope is located on both sides of the outer insulating sheath 12.

[0037] The protective sleeve 7 is made of Peak polar material, possessing certain tensile strength and elasticity. It is wrapped around the signal line 10 using molds or 3D printing technology. The insulating braided sleeve 8 is a cylindrical, flat-center circular sleeve that fills the cavity between the signal line 10 and the Peak protective sleeve 7. The shielding braided layer 9 is a flat, round, integral braided strip made of galvanized copper mesh, improving the anti-interference capability of the signal line 10 and tightly covering the surface of the Peak protective sleeve 7. There are six triangular cavities between the shielding braided layer 9 and the flat surface of the Peak protective sleeve 7, and the insulating braided sleeve 8 is filled inside the cavities. There are four signal lines 10, located in each cavity of the Peak protective sleeve 7, and the cavity containing the signal line 10 is also filled with the insulating braided sleeve 8. The shielding braided layer 9 is tightly wrapped by an outer insulating sheath 12, which is made of cross-linked polyethylene material, is flat and round, has excellent low-temperature resistance and chemical stability, is resistant to most acids and alkalis, and has excellent electrical insulation. The steel wire rope is located on both sides of the outer insulating sheath 12 to enhance the tensile strength of the cable.

[0038] Example 7 Based on Example 4, this example provides a high-precision automatic oil-water interface measurement and control device. The heated oil removal tank 2 is equipped with a heating device and an oil scraping device. The heating device is used to heat the crude oil adhering to the flat line, and the oil scraping device is used to scrape off the crude oil adhering to the flat line.

[0039] The heating device prevents the crude oil adhering to the flat wire from condensing upon cooling, and the oil stains adhering to the flat wire are removed by the oil scraping device and stored in the oil removal tank.

[0040] Example 8 This embodiment provides a high-precision automatic measurement and control method for oil-water interface, employing a high-precision automatic measurement and control device for oil-water interface, including the following steps: Step 1) The on-site SCADA platform or the field manually sends a measurement command to the controller 14. After receiving the measurement command, the controller 14 sends a signal to the servo motor. The servo motor rotates and drives the density probe 5 to move towards the bottom of the settling tank. Step 2) Density probe 5 measures the medium density in real time and sends it to controller 14. Magnetic counter measures the number of magnetic points in real time and sends it to controller 14 to calculate the vertical height. Controller 14 records the height of the measurement point and the corresponding density. Meanwhile, the controller 14 receives moisture content data sent by the multi-functional float in real time; Step 3) After the density meter moves to the bottom of the settling tank, the controller 14 controls the servo motor to rotate and drive the density probe 5 to move upward. Step 4) The controller 14 averages the height and corresponding density of the measurement points according to the set measurement height resolution, and obtains the position and thickness of the oil-water interface by combining the water content data; where the water content is greater than 95% is the water layer, and the water content is less than 5% is the oil layer. Step 5) When the controller 14 determines that the thickness of the oil-water interface is greater than the set upper limit value, the controller 14 sends a signal to the dosing device to start dosing, thereby regulating the thickness of the oil-water interface.

[0041] Step 3) During the upward movement of the density meter, the oil on the flat line is heated and scraped off by the heating and degreasing tank 2 between the servo level gauge 1 and the density probe 5, and then stored in the heating and degreasing tank 2. After the measurement is completed, the oil drain valve 3 set below the heating and degreasing tank 2 is opened to discharge the oil stored in the heating and degreasing tank 2 into the settling tank.

[0042] The controller 14 controls the forward and reverse rotation and start and stop of the servo motor; according to the set measurement height resolution (range: 0.1-20cm), it starts measuring at heights that are integer multiples of each measurement resolution. The controller 14 records the height and the density of the surrounding medium measured by the probe at each measurement; the controller 14 also has an output signal (4-20mA or pulse signal), which can control the dosing device or drain valve to achieve precise control of the emulsion layer thickness; the controller 14 can accept measurement commands from the on-site SCADA platform or local manual measurement commands. After receiving a measurement command, the controller 14 controls the servo motor to drive the probe to move up and down.

[0043] Following on-site testing in XX, this technology has demonstrated an accuracy of ±5mm in controlling the water layer and ±20mm in controlling the emulsion layer in the settling tank. It enables functions such as timed inventory checks and intelligent control of the settling tank. The successful testing of this technology significantly reduces employee workload, improves data accuracy, and achieves intelligent management of the settling tank. It has certain guiding significance in crude oil settling and separation and possesses high value for widespread application.

[0044] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A high-precision automatic measurement and control device for oil-water interface, characterized in that: The device includes a servo level gauge, a density probe, and a controller. The servo level gauge and the density probe are connected, and the servo level gauge and the controller are electrically connected. Under the control of the controller, the servo level gauge drives the density probe to move up and down. The density probe and the controller are electrically connected. The controller records the height and density at each measurement according to the set measurement height resolution. The controller is electrically connected to a dosing device and a drain valve. The dosing device is located above the settling tank, and the drain valve is located at the bottom of the settling tank. After receiving the dosing signal from the controller, the dosing device adds chemicals to the settling tank to regulate the thickness of the oil-water interface.

2. The high-precision automatic oil-water interface measurement and control device according to claim 1, characterized in that: The servo level gauge includes a servo motor, a winch, and an encoder. The servo motor is connected to the winch via gears. The encoder is mounted on the servo motor and is electrically connected to the controller. A flat wire is wound around the winch, and the other end of the flat wire is connected to a density probe.

3. The high-precision automatic oil-water interface measurement and control device according to claim 1, characterized in that: A heated oil removal tank and an oil drain valve are provided between the servo level gauge and the density probe, and the bottom of the heated oil removal tank and the oil drain valve are connected.

4. The high-precision automatic oil-water interface measurement and control device according to claim 1, characterized in that: The servo level gauge includes a servo motor, a winch, and a magnetic counter. The servo motor is connected to the winch via gears. The magnetic counter is mounted on the winch, and a flat wire is wound around the winch. Magnetic dots are provided on the flat wire. The magnetic counter and magnetic dots cooperate with each other. The magnetic counter is electrically connected to the controller. The flat wire is also connected to a multi-functional float and a boundary probe. The flat wire is electrically connected to the controller.

5. The high-precision automatic oil-water interface measurement and control device according to claim 3, characterized in that: One end of the heating and degreasing tank is connected to the servo level gauge via a flange, and the other end of the heating and degreasing tank is connected to the top flange of the settling tank. The oil drain valve is connected to the top flange via a flange.

6. The high-precision automatic oil-water interface measurement and control device according to claim 4, characterized in that: The flat wire includes a protective sheath, an insulating braided sheath, a shielding braided layer, an outer insulating sheath, a signal line, and a steel wire rope. The shielding braided layer tightly covers the inner surface of the protective sheath, the insulating braided sheath fills the cavity between the signal line and the protective sheath, and the steel wire rope is located on both sides of the outer insulating sheath.

7. The high-precision automatic oil-water interface measurement and control device according to claim 4, characterized in that: The heated oil removal tank is equipped with a heating device and an oil scraping device. The heating device is used to heat the crude oil adhering to the flat wire, and the oil scraping device is used to scrape off the crude oil adhering to the flat wire.

8. A high-precision automatic oil-water interface measurement and control device according to any one of claims 1-7, characterized in that: The settling tank is connected to a waveguide sleeve at the top, which extends downward into the settling tank, and the density probe moves up and down inside the waveguide sleeve.

9. A high-precision automatic measurement and control method for oil-water interface, employing the high-precision automatic measurement and control device for oil-water interface as described in claim 4, characterized in that: Includes the following steps: Step 1) The on-site SCADA platform or the field manually sends a measurement command to the controller. After receiving the measurement command, the controller sends a signal to the servo motor, and the servo motor rotates to drive the density probe to move towards the bottom of the settling tank. Step 2) The density probe measures the medium density in real time and sends it to the controller. The magnetic counter measures the number of magnetic points in real time and sends it to the controller to calculate the vertical height. The controller records the height of the measurement point and the corresponding density. Meanwhile, the controller receives moisture content data sent by the multi-functional float in real time; Step 3) After the density meter moves to the bottom of the settling tank, the controller controls the servo motor to rotate, which drives the density probe to move upward. Step 4) The controller averages the height and corresponding density of the measurement points according to the set measurement height resolution, and combines the water content data to obtain the position and thickness of the oil-water interface; where the water content is greater than 95%, it is a water layer, and the water content is less than 5%, it is an oil layer. Step 5) When the controller determines that the thickness of the oil-water interface is greater than the set upper limit value, the controller sends a signal to the dosing device to start dosing, thereby regulating the thickness of the oil-water interface.

10. The high-precision automatic measurement and control method for oil-water interface according to claim 9, characterized in that: Step 3) During the upward movement of the density meter, the oil on the flat line is heated and scraped off by the heating and degreasing tank between the servo level gauge and the density probe, and then stored in the heating and degreasing tank. After the measurement is completed, the drain valve set below the heating and degreasing tank is opened to discharge the oil stored in the heating and degreasing tank into the settling tank.

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