High-precision oil-water separation and trace metering device and testing method

Abstract

The invention discloses a high-precision oil-water separation and trace metering device and a testing method, and belongs to the technical field of oil-gas field development simulation experiment devices. The oil-water separator is provided with an upper overflow port and a lower overflow port which overflow water and oil respectively, the high-precision grading meter comprises a metering assembly formed by connecting at least two graduated tubes in series in the vertical direction, the graduation value of each graduated tube is sequentially reduced, and for every two adjacent graduated tubes, the graduation value of each graduated tube is larger than that of each graduated tube. The reference scale line of one graduated tube is aligned with the maximum scale line of the other graduated tube, and the measuring range of the graduated tube with the small graduation value is larger than the graduation value of the graduated tube with the large graduation value; meanwhile, the first moving assembly is arranged and used for pushing a liquid column formed by the oil product to move in the metering assembly. According to the high-precision grading meter, the oil product can be measured through the graduated tubes with multiple measuring ranges, the oil product can be accurately metered by changing the position of the oil product tubular column in the metering assembly, the overall measurement precision is improved, and the purpose of high-precision metering is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development simulation experimental devices and also to the technical field of oil and water volume measurement, in particular to a high-precision oil and water separation and micro-metering device and a testing method. Background Art

[0002] With the continued development of oil fields, artificial water injection is used to supplement the reservoir's natural energy after it has been depleted. After years or even decades of development, water-injected oil fields often enter a period of high or ultra-high water cut, resulting in extremely low oil production per unit time. This makes accurate measurement of oil production difficult during laboratory studies. Recent research has shown that injecting high-density water (thousands of times the reservoir's pore volume) into an oil field can significantly improve oil recovery. Laboratory long-core flooding experiments can be used to study the theory and technology of high-density water flooding, clarify its suitability, and provide guidance for field implementation. However, accurate measurement of the produced fluid from high-density water flooding experiments is crucial during these experiments. Parameters such as oil / gas / water yields and oil content in the produced fluid are of widespread concern in crude oil production. Inaccurate measurement of the oil content in the produced fluid can directly impact well and reservoir performance analysis, and ultimately affect overall crude oil production assessment.

[0003] In the existing metering device, its working principle is as follows Figure 1 As shown (see CN201520146466.2, an oil, gas, and water metering device suitable for indoor oil displacement experiments), a gas-liquid mixture is sent together into a graduated tube for separation. The separated gas is measured separately. The separated liquid is stratified in the graduated tube due to the different densities of oil and water (the density of oil is less than that of water). A U-shaped tube is set at the bottom of the graduated tube for drainage, and the drainage volume is measured by a graduated cylinder. However, this method presents several challenges in oil-water metering. First, as the liquid level in the graduated tube rises, the oil-water interface undergoes dynamic changes (gradually decreasing). Therefore, the volume of water in the graduated cylinder must be deducted from the reduced volume of water in the graduated tube to determine the final volume of produced water. Furthermore, during high-multiple waterflooding experiments, the displacement experiment period is long (1500 pore volumes). In the early stages, the oil production per unit time is very high. As the displacement progresses, the oil production rate gradually decreases, reaching an extremely low rate in the later stages. While a large-scale graduated tube can meet the requirements for early-stage measurements, it cannot provide the required measurement accuracy under extremely low oil production conditions. Using a high-precision graduated tube (i.e., one with a very small amount of liquid per unit length) requires a very long tube length. Furthermore, the oil-water interface fluctuates significantly during the test, further increasing the tube length. This type of graduated tube presents difficulties in both manufacturing and use. Currently, a common approach is to use a large-scale graduated tube, which results in significant errors in oil production measurement, especially in the later stages when production is low. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a high-precision oil-water separation and micro-metering device and testing method, which uses metering components of different ranges to measure the volume of oil, can achieve high-precision measurement throughout the measurement cycle, and significantly reduce the size of the measuring cylinder.

[0005] The specific scheme of the present invention is as follows: A high-precision oil-water separation and micro-metering device and testing method, comprising: A gas-liquid separator, used to separate the displacement products into gas and liquid; a gas volume measuring device, connected to the gas phase outlet of the gas-liquid separator, for measuring the gas volume; The oil-water separator is arranged vertically and connected to the liquid phase outlet of the gas-liquid separator. Overflow ports are provided at the upper and lower parts of the oil-water separator, with the lower overflow port communicating with the lower part of the oil-water separator via a U-shaped bend. This maintains a stable liquid level in the oil-water separator through the upper overflow port, and together with the upper and lower overflow ports, maintains fluctuations in the oil-water interface, thereby ensuring immediate separation of the produced oil and water. This eliminates the issue of volume changes in some oil or water in the separator affecting metering. Water volume measuring equipment, used to measure the amount of water overflowing from the overflow port at the bottom of the oil-water separator; A high-precision graded meter is used to measure the amount of oil overflowing from the overflow port on the upper part of the oil-water separator; the high-precision graded meter includes: A metering assembly comprising at least two graduated tubes connected in series vertically, with the graduations of the graduated tubes decreasing from one end to the other. For two adjacent graduated tubes, the reference graduation line of one tube is aligned with the maximum graduation line of the other tube, thereby ensuring continuity of the measurement scale. The measuring range of the graduated tube with a smaller graduation value is greater than the graduation value of the graduated tube with a larger graduation value (the graduation value refers to a minimum unit of measurement). The first moving component is used to push the liquid column formed by the oil product to move in the metering component.

[0006] As a specific embodiment of the present invention, the metering assembly is composed of two graduated tubes, and the first moving assembly includes: a piston located within the graduated tube and in sliding sealing connection with the graduated tube; The piston rod is fixedly connected to the piston and is used to push the piston to move axially in the graduated tube.

[0007] Furthermore, of the two scale tubes of the metering assembly, the scale tube with a smaller graduation value is located above the scale tube with a larger graduation value.

[0008] As a specific embodiment of the present invention, the first moving component includes: The liquid storage cup is used to store a first fluid that is immiscible and non-reactive with the oil product, and the density of the first fluid is greater than that of the oil product. The lower end of the metering assembly is inserted into the first fluid. Within the metering assembly, the oil and the first fluid are separated into layers due to the density difference, with the oil product located at the top. A lifting device used to drive the liquid storage cup and the metering component to move axially relative to each other.

[0009] Furthermore, it also includes a second fluid located in the metering component, the density of the second fluid is between the density of the oil product and the density of the first fluid, and the second fluid is neither miscible nor reactive with the oil product and the first fluid.

[0010] As a specific embodiment of the present invention, the gas phase of the metering component is connected to the atmosphere.

[0011] Another object of the present invention is to provide a method for using the above device.

[0012] A method for testing a high-precision oil-water separation and micro-metering device comprises the following steps: S1. Connect the gas-liquid separator, oil-water separator, gas volume measuring device and U-shaped tube; S2. Add water to the gas-liquid separator until the water overflows from the U-shaped tube connected to the gas-liquid separator; S3. Add displacement oil to the gas-liquid separator until the oil overflows from the upper overflow port of the gas-liquid separator, then connect the upper overflow port to the metering component of the high-precision graded meter, and connect the U-shaped tube outlet to the water volume measurement device; S4. Connect the displacement products of the water flooding experimental device to the gas-liquid separator, start water flooding, and use gas volume measuring equipment, water volume measuring equipment and high-precision graded metering devices to measure the production of gas, water and oil respectively.

[0013] When using a high-precision graded meter to measure the volume of oil, the piston is used to adjust the end face of the oil column so that one end face of the oil column is aligned with the scale line of the graduated tube with a large graduation value, and the other end face is located in the graduated tube with a small graduation value. The total oil volume is obtained by reading the two graduated tubes. Furthermore, when using a high-precision graded meter to measure the volume of oil, the end face of the oil column is adjusted using a piston so that one end face of the oil column is located in a graduated tube with a large graduation value, and the other end face is located in a graduated tube with a small graduation value. The oil output rate is determined by measuring the change in the height of the oil column per unit time. A method for testing a high-precision oil-water separation and micro-metering device comprises the following steps: S1. Connect the gas-liquid separator, oil-water separator, gas volume measuring device, and U-shaped tube; add the first liquid to the liquid storage cup, insert the lower part of the metering assembly into the first liquid, and add the second liquid to the metering assembly from the upper part of the metering assembly; S2. Add water to the gas-liquid separator until the water overflows from the U-shaped tube connected to the gas-liquid separator; S3. Add displacement oil to the gas-liquid separator until the oil overflows from the upper overflow port of the gas-liquid separator, then connect the upper overflow port to the metering component of the high-precision graded meter, and connect the U-shaped tube outlet to the water volume measurement device; S4. Connect the displacement products of the water flooding experimental device to the gas-liquid separator, start water flooding, and use gas volume measuring equipment, water volume measuring equipment and high-precision graded metering devices to measure the production of gas, water and oil respectively.

[0014] When using a high-precision graded meter to measure the volume of oil, the end face of the oil liquid column is adjusted by axial relative movement of the liquid storage cup and the metering assembly, so that one end face of the oil liquid column is aligned with the scale line of the scale tube with a large graduation value, and the other end face is located in the scale tube with a small graduation value, so that the total oil volume is obtained by reading the two scale tubes.

[0015] Compared with the existing technology, it has the following advantages: The present invention first separates the gas and liquid of the product to avoid fluctuations in the liquid level and oil-water interface when oil, water and gas are separated simultaneously in a container. The oil-water separator separates oil and water by overflow, which can achieve instant separation of the two, and the oil-water interface will not fluctuate. In addition, the high-precision graded meter can measure oil products through graduated tubes with multiple ranges, and can accurately measure oil products by changing the position of the oil product pipe column in the metering component, thereby improving the overall measurement accuracy and achieving the purpose of high-precision metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the existing oil-water metering device for water flooding experiments; Figure 2 2 is a schematic structural diagram of a high-precision oil-water separation and micro-metering device according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a high-precision oil-water separation and micro-metering device in another embodiment of the present invention; Figure 4 yes Figure 3 Schematic diagram of the structure of medium and high precision graded meter; Figure 5 This is a schematic structural diagram of a high-precision oil-water separation and micro-metering device in another embodiment of the present invention; Figure 6is a schematic structural diagram of a high-precision graded meter in another embodiment; In the figure: gas-liquid separator 100; gas volume measuring device 200; oil-water separator 300; water volume measuring device 400; high-precision graded meter 500; electronic balance 700; Metering assembly 510; first moving assembly 520; U-shaped tube 610; overflow tube 620; balance tube 630; first fluid 810; second fluid 820; Graduated tube 511; liquid storage cup 521; piston 522; piston rod 523; lifting mechanism 524; DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0018] Example

[0019] Please refer to Figure 2 and Figure 6 , which shows the overall structure of multiple specific embodiments of the high-precision oil-water separation and micro-metering device 100 of the present invention. The high-precision oil-water separation and micro-metering device of the present invention includes a gas-liquid separator 100, a gas volume measuring device 200, an oil-water separator 300, a water volume measuring device 400 and a high-precision graded meter 500, wherein the gas-liquid separator 100 is used to separate the displacement product into gas and liquid (liquid includes water and oil); the gas volume measuring device 200 is connected to the gas phase outlet of the gas-liquid separator 100, and is used to measure the volume of gas in the displacement product; the oil-water separator 300 is arranged vertically and is connected to the liquid phase outlet of the gas-liquid separator 100, and is used to separate the liquid phase (oil-water mixture) of the gas-liquid separator 100 into oil and water. Due to the density difference, oil and water are stratified in the oil-water separator 300, and the oil layer is located above the water layer. Overflow ports are provided at the upper and lower parts of the device 300, namely the upper overflow port and the lower overflow port. The upper overflow port is located above the lower overflow port, wherein the lower overflow port is connected to the lower part of the oil-water separator 300 through the U-shaped bend 610, and the volume of water overflowing from the lower overflow port of the oil-water separator 300 is measured by the water volume measuring device 400. The fluid in the upper overflow port overflows into the high-precision graded meter 500 to measure the oil. The top of the oil-water separator 300 is connected to the atmosphere to maintain normal pressure. In this way, first, the liquid level in the oil-water separator 300 can be maintained stable through the upper overflow port, and the produced water can be promptly sent out in the form of overflow through the lower overflow port to avoid fluctuations in the oil-water interface and ensure timely separation of oil and water.

[0020] The high-precision graded meter 500 includes a metering assembly 510 and a first moving assembly 520. The metering assembly 510 is composed of at least two graduated tubes 511 connected in series in the vertical direction. The first moving assembly 520 is used to push the oil liquid column to move in the metering assembly 510. The outer wall of each graduated tube 511 is provided with scales and both ends are open. From one end of the metering assembly 510 to the other end, the graduation values ​​of each graduated tube 511 decrease successively. For two adjacent graduated tubes 511, the reference scale line of one graduated tube 511 is aligned with the maximum scale line of the other graduated tube 511 to ensure the continuity of the measurement scale. When the oil liquid column is located in the two graduated tubes 511, the volume of the entire oil liquid column can be read through the scales of the two graduated tubes 511. At the same time, the range of the graduated tube 511 with a smaller graduation value is greater than the graduation value of the graduated tube 511 with a larger graduation value. value, thereby ensuring that "when one end face of the oil liquid column moves one graduation value unit in the scale tube 511 with a larger graduation value and is aligned with the scale line, the other end face of the oil liquid column is still located in the scale tube 511 with a smaller graduation value. Since the end face of the oil liquid column in the scale tube 511 with a larger graduation value is aligned with the scale, the estimation error is small and the reading is more accurate. Although the liquid level in the scale tube 511 with a smaller graduation value is not necessarily aligned with the scale tube, the graduation value is smaller and the accuracy is also higher." Its measurement accuracy is significantly improved compared to "the entire oil liquid column is located in the scale tube 511 with a larger graduation value." In specific implementation, the scale tube 511 with a small graduation value can be placed above the scale tube 511 with a large graduation value, or the opposite setting can be made, that is, the scale tube 511 with a large graduation value can be placed above the scale tube 511 with a small graduation value. In some embodiments, it is preferred to place the scale tube 511 with a small graduation value above the scale tube 511 with a large graduation value. During operation, it is no longer required that one end face of the oil liquid column be aligned with the scale of the scale tube 511 with a larger graduation value. It is only necessary to ensure that the upper end face of the oil liquid column is located in the scale tube 511 with an ideal graduation value. The oil production rate (output per unit time) is characterized by measuring the rising height of the oil liquid column in the scale tube 511 with an ideal graduation value per unit time. In addition, in order to prevent the oil liquid column from causing pressure changes in the gas phase of the metering component 510 when it moves, thereby affecting the flow of the fluid, the gas phase part of the metering component 510 is connected to the atmosphere, such as Figure 2-4 As shown, the metering assembly 510 is fixedly connected to the overflow pipe 620, and a balance pipe 630 is provided on the overflow pipe 620 for connecting the gas phase of the metering assembly 510 with the atmosphere.

[0021] In the present invention, the number of the graduated tubes 511 in the metering assembly 510 can be set as needed, such as two, three or more, and the graduation values ​​and ranges of each level can also be selected as needed, for example, Figure 2-Figure 4 In the embodiment shown, the first-level graduation value is 0.01 ml, and the measuring range is 1 ml; the second-level graduation value is 0.1 ml, and the measuring range is 10 ml. Figure 6 In the embodiment shown, the metering assembly 510 is composed of three graduated tubes 511 connected in series, with the first level graduation value of 0.01 ml and the measuring range of 1 ml; the second level graduation value of 0.1 ml and the measuring range of 10 ml; and the third level graduation value of 1 ml and the measuring range of 50 ml.

[0022] In the present invention, it is necessary to push the oil column to move in the metering component 510. In some embodiments, such as Figure 2 、 Figure 3 As shown, the first moving assembly 520 includes a piston 522, and the piston 522 is slidingly and sealingly connected to the inner wall of the graduated tube 511. The piston 522 is also equipped with a piston rod 523 for pushing the piston 522 to move up and down in the graduated tube 511. At the same time, a lifting mechanism 524 is also provided for pushing the piston rod 523 to move along its axial direction.

[0023] In the present invention, the graduation values ​​of each graduated tube 511 are different, that is, the inner diameters are different (the larger the graduation value, the larger the inner diameter of the graduated tube 511, which is conducive to reducing the length of the entire metering assembly 510). It is easy to move the piston 522 in one graduated tube 511, but it is more difficult to move the piston 522 in multiple graduated tubes 511. Therefore, in other embodiments, liquid can be used to promote the movement of the oil liquid column, such as Figure 4 As shown, the first moving component 520 includes a liquid storage cup 521 and a lifting mechanism 524. The liquid storage cup 521 is filled with a liquid that is denser than oil and does not dissolve or react with oil, called the first fluid 810, such as water. In this way, after the metering component 510 is inserted into the first fluid 810, the liquid levels inside and outside the metering component 510 are balanced. When oil enters, the oil is immiscible with the first fluid 810 and has a lower density, so it will be stratified and the oil is located in the upper layer. The lifting mechanism 524 can be used to drive the liquid storage cup 521 and the metering component 510 to move axially relative to each other, thereby driving the oil liquid column to move up and down in the metering component 510. In specific implementation, it can be as follows Figure 4 As shown, the metering assembly 510 is fixed, and the liquid storage cup 521 is moved by the lifting mechanism 524 .

[0024] In addition, in the initial stage, the interface between the first fluid 810 and the oil may be close to the liquid level in the liquid storage cup 521, causing the liquid level in the liquid storage cup 521 and the interface between the first fluid 810 and the oil in the graduated tube 511 to overlap when reading, affecting the reading. To this end, it is necessary to separate the two in the axial direction. For this purpose, a certain amount of oil can be pre-filled, or Figure 6As shown, graduated tube 511 is filled with a second fluid 820. The density of second fluid 820 lies between that of the oil and first fluid 810, and second fluid 820 is neither reactive nor miscible with either. Consequently, due to the density differences, the oil, first fluid 810, and second fluid 820 are separated into separate layers within graduated tube 511, forming, from top to bottom, columns of oil, second fluid 820, and first fluid 810. By adjusting the heights of the individual columns, the lower end of the oil column can be positioned above the liquid level in liquid storage cup 521. In a specific implementation, first fluid 810 can be bromobenzene, and second fluid 820 can be water. Alternatively, a higher-density fluid can be used for first fluid 810 to further distance the lower end of the oil column from the liquid level in liquid storage cup 521.

[0025] In the present invention, the gas-liquid separator 100 can be a spherical container to facilitate gas-liquid separation. In the present invention, the gas volume measuring device 200 can be a conventional gas flow meter. Considering that the gas volume is greatly affected by temperature, a condenser can be set between the gas volume measuring device 200 and the gas-liquid separator 100 to maintain the gas temperature stable, and the condensed liquid flows back into the gas-liquid separator 100. The water volume measuring device 400 can be a device in the prior art, such as setting a measuring cylinder to obtain its volume by reading, or placing the measuring cylinder on an electronic balance 700 to calculate the volume by mass and density.

[0026] In addition, the present invention also provides an application method of the above device, comprising the following steps: S1. Connect the gas-liquid separator 100, the oil-water separator 300, the gas volume measuring device 200 and the U-shaped tube 610; S2. Add water to the gas-liquid separator 100 until the water overflows from the U-shaped tube 610; S3. Add displacement oil to the gas-liquid separator 100 until the oil overflows from the upper overflow port of the gas-liquid separator 100 . Then connect the upper overflow port to the metering assembly 510 of the high-precision graded meter 500 , and connect the outlet of the U-shaped tube 610 to the water quantity measuring device 400 . S4. Connect the displacement product of the water flooding experimental device to the gas-liquid separator 100, start water flooding, and use the gas volume measuring device 200, the water volume measuring device 400 and the high-precision classification meter 500 to measure the production of gas, water and oil respectively.

[0027] When using the high-precision graded meter 500 to measure the volume of oil, the piston 522 is used to adjust the end face of the oil column so that one end face of the oil column is aligned with the scale line of the scale tube 511 with a large graduation value, and the other end face is located in the scale tube 511 with a small graduation value, thereby obtaining the total volume of the oil by reading the two scale tubes 511. For example, when using Figure 2 、 3 When the device shown in the figure measures the volume of oil, the piston 522 can be used to adjust the end face of the oil column. Figure 2 In the process, the upper end surface of the oil column can be adjusted to align with the scale line of the scale tube 511 with a large graduation value, and the lower end surface of the oil column can be adjusted to be located at the scale tube 511 with a small graduation value. Figure 3 The lower end of the oil column can be adjusted to align with the scale line of the large graduation tube 511, and the upper end of the oil column can be adjusted to be located on the small graduation tube 511. In addition, when a condenser is provided, the cooling water for the condenser needs to be connected when the device is connected.

[0028] for Figure 3 In the embodiment shown, a high-precision graded meter 500 can also be used to measure the oil production rate (i.e., to determine the oil production volume per unit time). In specific implementation, the piston 522 is used to adjust the upper end surface of the oil liquid column to be located in the graduated tube 511 of the ideal graduation value, and the oil production rate is calculated by the amount of increase in the liquid level in the graduated tube 511 per unit time.

[0029] for Figure 4 For the embodiment shown, it includes the following steps: S1. Connect the gas-liquid separator 100, the oil-water separator 300, the gas volume measuring device 200, and the U-shaped tube 610; add the first liquid 810 to the liquid storage cup 521, insert the lower portion of the metering component 510 into the first liquid 810, and add the second liquid 820 to the metering component 510 from the upper portion; S2. Add water to the gas-liquid separator 100 until the water overflows from the U-shaped tube 610; S3. Add displacement oil to the gas-liquid separator 100 until the oil overflows from the upper overflow port of the gas-liquid separator 100 . Then connect the upper overflow port to the metering assembly 510 of the high-precision graded meter 500 , and connect the outlet of the U-shaped tube 610 to the water quantity measuring device 400 . S4. Connect the displacement product of the water flooding experimental device to the gas-liquid separator 100, start water flooding, and use the gas volume measuring device 200, the water volume measuring device 400 and the high-precision classification meter 500 to measure the production of gas, water and oil respectively.

[0030] When using the high-precision graded meter 500 to measure the volume of oil, the end face of the oil liquid column is adjusted by axial relative movement of the liquid storage cup 521 and the metering component 510, so that one end face of the oil liquid column is aligned with the scale line of the scale tube 511 with a large graduation value, and the other end face is located in the scale tube 511 with a small graduation value, so that the total oil volume is obtained by the readings of the two scale tubes 511.

[0031] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the embodiments of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A high-precision oil-water separation and micro-metering device, characterized in that: include: A gas-liquid separator, used to separate the displacement products into gas and liquid; a gas volume measuring device, connected to the gas phase outlet of the gas-liquid separator, for measuring the gas volume; An oil-water separator arranged vertically and connected to the liquid phase outlet of the gas-liquid separator, wherein overflow ports are respectively provided at the upper and lower parts of the oil-water separator, wherein the lower overflow port is connected to the lower part of the oil-water separator via a U-shaped elbow; A water volume measuring device, used to measure the amount of water overflowing from the overflow port at the bottom of the oil-water separator; A high-precision graded meter is used to measure the amount of oil overflowing from the upper overflow port of the oil-water separator; the high-precision graded meter includes: A metering assembly comprising at least two graduated tubes connected in series along a vertical direction, wherein the graduation values ​​of each graduated tube decrease from one end to the other end of the metering assembly, and for two adjacent graduated tubes, the reference scale line of one graduated tube is aligned with the maximum scale line of the other graduated tube, thereby ensuring the continuity of the measurement scale, and the range of the graduated tube with a smaller graduation value is greater than the graduation value of the graduated tube with a larger graduation value; The first moving component is used to push the liquid column formed by the oil product to move in the metering component.

2. A high-precision oil-water separation and micro-metering device according to claim 1, characterized in that: The metering assembly is composed of two graduated tubes, and the first moving assembly includes: a piston located in the graduated tube and in sliding sealing connection with the graduated tube; The piston rod is fixedly connected to the piston and is used to push the piston to move axially in the graduated tube.

3. A high-precision oil-water separation and micro-metering device according to claim 2, characterized in that: Of the two graduated tubes of the metering assembly, the graduated tube with a smaller graduation value is located above the graduated tube with a larger graduation value.

4. A high-precision oil-water separation and micro-metering device according to claim 1, characterized in that: The first moving component includes: a liquid storage cup, used for storing a first fluid that is immiscible and non-reactive with the oil product, wherein the density of the first fluid is greater than that of the oil product, and the lower end of the metering assembly is inserted into the first fluid; A lifting device for driving the liquid storage cup and the metering assembly to move relative to each other in the axial direction.

5. A high-precision oil-water separation and micro-metering device according to claim 4, characterized in that: The metering assembly further includes a second fluid located in the metering assembly. The density of the second fluid is between the density of the oil product and the density of the first fluid. The second fluid is neither miscible nor reactive with the oil product nor the first fluid.

6. A high-precision oil-water separation and micro-metering device according to claim 1, characterized in that: The gas phase of the metering assembly is in communication with the atmosphere.

7. A method for testing a high-precision oil-water separation and micro-metering device, using the high-precision oil-water separation and micro-metering device according to claim 3, characterized in that: The steps include: S1. Connect the gas-liquid separator, oil-water separator, gas volume measuring device and U-shaped tube; S2. adding water to the gas-liquid separator until the water overflows from the U-shaped tube connected to the gas-liquid separator; S3. Adding displacement oil into the gas-liquid separator until the oil overflows from the upper overflow port of the gas-liquid separator, then connecting the upper overflow port to the metering component of a high-precision graded meter, and connecting the U-shaped tube outlet to a water quantity measuring device; S4. Connect the displacement product of the water flooding experimental device to the gas-liquid separator, start water flooding, and use a gas volume measuring device, a water volume measuring device, and a high-precision graded meter to measure the production of gas, water, and oil respectively; When the high-precision graded meter is used to measure the volume of oil, the end face of the oil liquid column is adjusted using a piston so that one end face of the oil liquid column is aligned with the scale line of the scale tube with a large graduation value, and the other end face is located in the scale tube with a small graduation value, thereby obtaining the total volume of the oil by reading the two scale tubes.

8. According to the testing method of a high-precision oil-water separation and micro-metering device according to claim 7, when the high-precision graded meter is used to measure the volume of the oil product, the end face of the oil liquid column is adjusted by a piston so that one end face of the oil liquid column is located in a scale tube with a large graduation value and the other end face is located in a scale tube with a small graduation value. The oil output rate is determined by measuring the height change of the oil liquid column per unit time.

9. A method for testing a high-precision oil-water separation and micro-metering device, using the high-precision oil-water separation and micro-metering device according to claim 4, characterized in that: The steps include: S1. Connect the gas-liquid separator, oil-water separator, gas volume measuring device, and U-shaped tube; add the first liquid to the liquid storage cup, insert the lower part of the metering assembly into the first liquid, and add the second liquid to the metering assembly from the upper part of the metering assembly; S2. adding water to the gas-liquid separator until the water overflows from the U-shaped tube connected to the gas-liquid separator; S3. Adding displacement oil into the gas-liquid separator until the oil overflows from the upper overflow port of the gas-liquid separator, then connecting the upper overflow port to the metering component of the high-precision graded meter, and connecting the U-shaped tube outlet to the water quantity measuring device; S4. Connect the displacement product of the water flooding experimental device to the gas-liquid separator, start water flooding, and use a gas volume measuring device, a water volume measuring device, and a high-precision graded meter to measure the production of gas, water, and oil respectively; When the high-precision graded meter is used to measure the volume of oil, the end face of the oil liquid column is adjusted by axial relative movement of the liquid storage cup and the metering assembly, so that one end face of the oil liquid column is aligned with the scale line of the scale tube with a large graduation value, and the other end face is located in the scale tube with a small graduation value, thereby obtaining the total oil volume through the readings of the two scale tubes.

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