Crude oil gas content detection device and method matched with standard volume tube for use

Abstract

The invention discloses a crude oil gas content detection device and method matched with a standard volume tube for use, a buoyancy lift type liquid pressing plate is arranged in an inner cavity of a detection tube and covers the surface of crude oil in the detection tube, and a gas inlet is formed in the top of the detection tube and is communicated with a pressure control assembly; the pressure control assembly is used for supplying gas into the detection pipe, so that the pressure borne by the crude oil below the buoyancy lift type liquid pressing plate is the same as the pressure of the crude oil in the pipeline; a liquid inlet is formed in the bottom of the detection pipe and can be communicated with an outlet of the standard volume pipe through a pipeline; a temperature sensor is arranged on the detection tube; the liquid level meter is used for detecting the liquid level of crude oil in the detection pipe, and the bubble detection unit is arranged on the detection pipe and used for detecting whether the crude oil in the detection pipe contains micro-scale bubbles or not. The method can be used for detecting whether the crude oil real liquid contains the micro-scale bubbles or not, provides a basis for correcting the verification result of the standard volume pipe on the crude oil flowmeter, and breaks through the limitation of an existing gas content detection method.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring gas-containing crude oil, and in particular relates to a crude oil gas-containing detection device and method used in conjunction with a standard volume tube. Background Art

[0002] The crude oil produced in the oil field is transported through the oil pipeline, and the amount of oil transported is measured by the flow meter. The flow meter installed on the oil pipeline needs to be calibrated regularly to determine its error and repeatability. The vehicle-mounted mobile standard volume tube is a common method for calibrating the volumetric crude oil flow meter. It can be moved to the installation location of the crude oil flow meter to calibrate the flow meter without disassembling the flow meter. This calibration method also faces a problem that needs to be solved urgently, that is, the crude oil liquid may contain micro-scale bubbles. At this time, even if the gas content is very low, it will affect the accuracy of the standard volume tube, making the inspector doubt the reliability of the calibration result. The content of dissolved gas in the crude oil liquid is easily affected by pressure and temperature. The dissolved gas is usually a micro-scale bubble with a diameter of less than 1mm. The defoamer installed on the oil pipeline cannot completely separate it from the crude oil. Therefore, a crude oil liquid gas content detection device and method that can be used in conjunction with the standard volume tube is needed to determine whether the crude oil liquid contains micro-scale bubbles. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a crude oil gas detection device and method for use with a standard volume tube. The present invention can be used to detect whether the actual crude oil contains micro-scale bubbles, provide a basis for correcting the calibration results of the standard volume tube for the crude oil flow meter, and break through the limitations of the existing gas detection methods.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A crude oil gas detection device used in conjunction with a standard volume tube, comprising a detection tube, a pressure control component, a floating pressure plate, a liquid level gauge and a bubble detection unit;

[0006] The floating pressure plate is arranged in the inner cavity of the detection tube, and can cover the surface of the crude oil in the detection tube. The top of the detection tube is provided with an air inlet, and the pressure control component is connected with the air inlet at the top of the detection tube; the pressure control component is used to supply air into the detection tube, so that the pressure of the crude oil below the floating pressure plate is the same as the pressure of the crude oil in the oil pipeline;

[0007] A liquid inlet is provided at the bottom of the detection tube, and the liquid inlet can be connected to the outlet of the standard volume tube through a pipeline;

[0008] The detection tube is provided with a temperature sensor for detecting the temperature of the crude oil;

[0009] The liquid level meter is used to detect the liquid level of the crude oil in the detection tube. The bubble detection unit is arranged on the detection tube. The bubble detection unit is used to detect whether the crude oil in the detection tube contains micro-scale bubbles.

[0010] Preferably, a guide rod for guiding the floating liquid pressure plate is provided in the detection tube along its axial direction, the upper end of the guide rod is fixedly connected to the top of the detection tube, and the lower end of the guide rod is fixedly connected to the bottom of the detection tube. A through hole for the guide rod to pass through is provided on the floating liquid pressure plate, and the floating liquid pressure plate is sleeved on the guide rod through the through hole and can move freely along the guide rod.

[0011] Preferably, at least two guide rods are provided, and all guide rods are symmetrically distributed about the axis of the detection tube.

[0012] Preferably, the liquid level meter includes a magnetic liquid level indicator and a floating magnetic pole adapted to the magnetic liquid level indicator, the magnetic liquid level indicator is arranged on one side outside the detection tube and parallel to the detection tube, and the floating magnetic pole is arranged on a floating liquid pressure plate.

[0013] Preferably, the bubble detection unit includes an ultrasonic transmitting probe, an ultrasonic receiving probe and a data acquisition system, the ultrasonic transmitting probe and the ultrasonic receiving probe are both connected to the data acquisition system, the ultrasonic transmitting probe and the ultrasonic receiving probe are disposed on the detection tube and are arranged symmetrically about the axis of the detection tube, and the ultrasonic receiving probe is directly opposite to the ultrasonic transmitting probe.

[0014] Preferably, a plurality of ultrasonic transmitting probes and ultrasonic receiving probes are provided, the plurality of ultrasonic transmitting probes are spaced apart in the axial direction of the detection tube, and the plurality of ultrasonic receiving probes are arranged opposite to the ultrasonic transmitting probes one by one.

[0015] Preferably, the pressure control component includes an inert gas source, an airflow shut-off valve, a gas flow integrator, a pressure setter, a pressure sensor and a fluid overflow valve. The outlet of the inert gas source is connected to the air inlet of the detection tube through a first pipeline. The airflow shut-off valve and the gas flow integrator are arranged on the first pipeline. The airflow shut-off valve is located upstream of the gas flow integrator. The pressure setter is connected to the air inlet of the detection tube. The air inlet of the detection tube is also connected to a second pipeline. The pressure sensor and the fluid overflow valve are arranged on the second pipeline. The pressure sensor is arranged between the fluid overflow valve and the air inlet of the detection tube.

[0016] Preferably, the inert gas source is a high-pressure gas cylinder, and a high-pressure gas pressure reducing valve is provided at the outlet of the high-pressure gas cylinder.

[0017] Preferably, the liquid inlet of the detection tube is connected to a third pipeline and a fourth pipeline, the third pipeline is provided with a fluid drain valve, the fourth pipeline is provided with a connecting valve, and the inlet end of the fourth pipeline is connected to a transfer tube for connecting with the outlet of the standard volume tube.

[0018] The present invention also provides a method for detecting gas content in crude oil, which is performed using the crude oil gas content detection device used in conjunction with the standard volume tube as described above, and includes the following process:

[0019] The liquid inlet of the detection tube is connected to the outlet of the standard volume tube, and the air pressure in the detection tube is controlled to be the same as the pressure of the crude oil in the oil pipeline through the pressure control component; then the crude oil flowing out of the crude oil flowmeter received by the standard volume tube is passed into the detection tube from the liquid inlet of the detection tube through the crude oil outlet of the standard volume tube until the detection tube is filled with crude oil. During the process of filling the detection tube with crude oil, the air pressure in the detection tube is controlled to be the same as the pressure of the crude oil in the oil pipeline through the pressure control component; when the detection tube is filled with crude oil, it is allowed to stand still so that the distribution state of the crude oil in the detection tube is stable and the temperature of the crude oil is the same as the temperature of the crude oil in the oil pipeline, and then the bubble detection unit is used to detect whether the crude oil in the detection tube contains micro-scale bubbles.

[0020] The present invention has the following beneficial effects:

[0021] In the crude oil gas detection device used in conjunction with the standard volume tube of the present invention, the pressure in the detection tube can be maintained to be the same as the pressure of the crude oil in the oil pipeline by setting a pressure control component, so that when the crude oil is injected into the detection tube, the crude oil can be prevented from releasing more dissolved gas in the detection tube due to a sudden drop in pressure in the detection tube, thereby ensuring that the dissolved gas content in the detection tube is the same as the dissolved gas content in the oil pipeline. By setting a floating pressure plate, the gas injected by the pressure control component can be separated from the crude oil as much as possible, and the gas injected by the pressure control component can be prevented from dissolving in the crude oil as much as possible to affect the bubble detection result. By setting a bubble detection unit, it can be detected whether the crude oil in the detection tube contains micro-scale bubbles, and the detection result of the bubble detection unit can provide a basis for correcting the calibration result of the standard volume tube for the crude oil flowmeter. The present invention also monitors the temperature of the crude oil in the detection tube in real time by setting a temperature sensor, providing a temperature basis for measuring bubbles. In summary, it can be seen that the present invention can measure the dissolved gas in crude oil under the same conditions as the actual working conditions, thereby providing a basis for correcting the calibration results of the crude oil flow meter using the standard volume tube, breaking through the limitations of existing gas detection methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a crude oil gas-containing detection device of the present invention;

[0023] Figure 2 is a schematic diagram of the crude oil gas detection device of the present invention when used;

[0024] Among them, 1-detection tube, 2-ultrasonic transmitting probe, 3-ultrasonic receiving probe, 4-floating type pressure plate, 5-floating type magnetic pole, 6-guide rod, 7-magnetic liquid level indicator, 8-data acquisition system, 9-fluid drain valve, 10-connecting valve, 11-transfer tube, 12-high-pressure gas tank, 13-high-pressure gas reducing valve, 14-air flow stop valve, 15-gas flow integrator, 16-pressure constant value device, 17-pressure sensor, 18-fluid overflow valve, 19-temperature sensor, 20-oil pipeline, 21-standard volume tube, 22-crude oil flow meter, 23-defoamer. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See also Figure 1 and Figure 2 The crude oil gas content detection device provided by the present invention and used in conjunction with the standard volume tube includes a detection tube 1, a pressure control component, a floating liquid pressure plate 4, a liquid level gauge and a bubble detection unit; the floating liquid pressure plate 4 is arranged in the inner cavity of the detection tube 1, and the floating liquid pressure plate 4 can cover the surface of the crude oil in the detection tube 1. The top of the detection tube 1 is provided with an air inlet, and the pressure control component is connected to the air inlet at the top of the detection tube 1; the pressure control component is used to supply air to the detection tube 1, so that the pressure on the crude oil located below the floating liquid pressure plate 4 is the same as the pressure of the crude oil in the oil pipeline; the bottom of the detection tube 1 is provided with a liquid inlet, and the liquid inlet can be connected to the outlet of the standard volume tube through a pipeline; the detection tube 1 is provided with a temperature sensor 19 for detecting the temperature of the crude oil; the liquid level gauge is used to detect the liquid level of the crude oil in the detection tube 1, and the bubble detection unit is arranged on the detection tube 1, and the bubble detection unit is used to detect whether the crude oil in the detection tube 1 contains micro-scale bubbles.

[0027] See also Figure 2 The process of the crude oil gas detection method using the crude oil gas detection device of the present invention is as follows:

[0028] The liquid inlet of the detection tube 1 is connected to the outlet of the standard volume tube 21, and the air pressure in the detection tube 1 is controlled to be the same as the pressure of the crude oil in the oil pipeline through the pressure control component; then the crude oil flowing out of the crude oil flowmeter 22 received by the standard volume tube 21 is passed into the detection tube 1 from the liquid inlet of the detection tube 1 through the crude oil outlet of the standard volume tube 21 until the detection tube 1 is filled with crude oil. During the process of filling the detection tube 1 with crude oil, the air pressure in the detection tube 1 is controlled to be the same as the pressure of the crude oil in the oil pipeline through the pressure control component; when the detection tube 1 is filled with crude oil, it is allowed to stand still so that the distribution state of the crude oil in the detection tube 1 is stable and the temperature of the crude oil is the same as the temperature of the crude oil in the oil pipeline, and then the bubble detection unit is used to detect whether the crude oil in the detection tube 1 contains micro-scale bubbles.

[0029] When the test is completed, the liquid inlet of the test tube 1 is disconnected from the outlet of the standard volume tube 21, and the crude oil in the test tube 1 is drained to prepare for the next test.

[0030] As a preferred embodiment of the present invention, a guide rod 6 for guiding the floating liquid pressure plate 4 is provided in the detection tube 1 along its axial direction, the upper end of the guide rod 6 is fixedly connected to the top of the detection tube 1, and the lower end of the guide rod 6 is fixedly connected to the bottom of the detection tube 1. A through hole for the guide rod 6 to pass through is provided on the floating liquid pressure plate 4. The floating liquid pressure plate 4 is sleeved on the guide rod 6 through the through hole and can move freely along the guide rod 6. The guide rod 6 can guide the floating liquid pressure plate 4 to ensure that the floating liquid pressure plate 4 can move up and down smoothly.

[0031] As a preferred embodiment of the present invention, at least two guide rods 6 are provided, and all guide rods 6 are symmetrically distributed about the axis of the detection tube 1. At least two guide rods 6 can further stabilize the position of the floating pressure plate 4 in the detection tube 1 to prevent changes in its position from disturbing the flow of crude oil in the detection tube 1.

[0032] As a preferred embodiment of the present invention, the liquid level meter includes a magnetic liquid level indicator 7 and a floating magnetic pole 5 adapted to the magnetic liquid level indicator 7. The magnetic liquid level indicator 7 is arranged on one side of the outside of the detection tube 1 and is arranged parallel to the detection tube 1. The floating magnetic pole 5 is arranged on the floating liquid pressure plate 4. The liquid level meter of the present invention can detect the crude oil level in the detection tube 1 in a non-contact manner, and the detection is convenient. At the same time, the structure of the floating liquid pressure plate 4 is well utilized, and the floating magnetic pole 5 is arranged on the floating liquid pressure plate 4 to cooperate with the magnetic liquid level indicator 7 to monitor the liquid level of the crude oil in the detection tube 1 in real time.

[0033] As a preferred embodiment of the present invention, the bubble detection unit includes an ultrasonic transmitting probe 2, an ultrasonic receiving probe 3 and a data acquisition system 8. The ultrasonic transmitting probe 2 and the ultrasonic receiving probe 3 are both connected to the data acquisition system 8. The ultrasonic transmitting probe 2 and the ultrasonic receiving probe 3 are arranged on the detection tube 1 and symmetrically about the axis of the detection tube 1. The ultrasonic receiving probe 3 is directly opposite to the ultrasonic transmitting probe 2. The ultrasonic method is usually used to measure the flow rate of the fluid. So far, it has not been used to detect trace gas in crude oil. The present invention uses two sets of sound velocity data obtained at two different times in the data acquisition system 8 to determine whether there is a significant difference in the sound velocity at different positions at the height of the detection tube by performing a t test on the two sets of sound velocity data, and whether the actual crude oil contains bubbles with a size of less than 1 mm.

[0034] As a preferred embodiment of the present invention, a plurality of ultrasonic transmitting probes 2 and ultrasonic receiving probes 3 are provided, and the plurality of ultrasonic transmitting probes 2 are spaced apart in the axial direction of the detection tube 1, and the plurality of ultrasonic receiving probes 3 are arranged opposite to the ultrasonic transmitting probes 2. The overall distribution of micro-scale bubbles in the detection tube 1 can be detected by the plurality of ultrasonic transmitting probes 2 and ultrasonic receiving probes 3, providing a more accurate and comprehensive basis for correcting the calibration result of the standard volume tube for the crude oil flow meter.

[0035] As a preferred embodiment of the present invention, the pressure control component includes an inert gas source, an airflow shut-off valve 14, a gas flow integrator 15, a pressure setter 16, a pressure sensor 17 and a fluid overflow valve 18. The outlet of the inert gas source is connected to the air inlet of the detection tube 1 through a first pipeline. The airflow shut-off valve 14 and the gas flow integrator 15 are arranged on the first pipeline. The airflow shut-off valve 14 is located upstream of the gas flow integrator 15. The pressure setter 16 is connected to the air inlet of the detection tube 1. The air inlet of the detection tube 1 is also connected to a second pipeline. The pressure sensor 17 and the fluid overflow valve 18 are arranged on the second pipeline. The pressure sensor 17 is arranged between the fluid overflow valve 18 and the air inlet of the detection tube 1. When the pressure control assembly of the present invention is working, the inert gas source injects inert gas into the detection tube 1 through the first pipeline, the gas flow integrator 15 can measure the flow of the inert gas in real time, the pressure sensor 17 can monitor the pressure of the inert gas in the detection tube 1 in real time, the pressure setter 16 can adjust the pressure in the detection tube 1 in real time, so that the air pressure in the detection tube 1 is maintained at a preset pressure (such as the pressure of crude oil in the oil pipeline), and the air flow stop valve 14 is used to cut off or circulate the first pipeline. The fluid overflow valve 18 is used for gas overflow in the detection tube 1. When crude oil is injected into the detection tube 1, the fluid overflow valve 18 can serve as an exhaust valve for the detection tube 1. In addition, when the detection is completed and the crude oil in the detection tube 1 needs to be emptied, opening the fluid overflow valve 18 can allow the crude oil in the detection tube 1 to be smoothly discharged from the liquid inlet of the detection tube 1.

[0036] As a preferred embodiment of the present invention, the inert gas source adopts a high-pressure gas tank 12, and a high-pressure gas pressure reducing valve 13 is provided at the outlet of the high-pressure gas tank 12. The high-pressure gas pressure reducing valve 13 can reduce the pressure of the inert gas discharged from the high-pressure gas tank 12 to a suitable pressure and then pass it into the detection tube 1.

[0037] As a preferred embodiment of the present invention, the liquid inlet of the detection tube 1 is connected to the third pipeline and the fourth pipeline. The third pipeline is provided with a fluid drain valve 9, which can be opened when the detection tube 1 needs to be emptied to allow the crude oil in the detection tube 1 to be smoothly drained. The fluid drain valve 9 needs to be closed during oil filling. The fourth pipeline is provided with a connecting valve 10. The inlet end of the fourth pipeline is connected to a transfer tube 11 for connecting with the outlet of the standard volume tube. The transfer tube 11 can facilitate the connection of the fourth pipeline with the outlet of the standard volume tube. The connecting valve 10 can control the on-off of the fourth pipeline, which is convenient for oil filling and draining operations during detection.

[0038] Example

[0039] like Figure 1 and Figure 2As shown, the crude oil gas content detection device used in conjunction with the standard volume tube in this embodiment includes a detection tube 1, a high-pressure gas tank 12, a high-pressure gas pressure reducing valve 13, an air flow stop valve 14, a gas flow integrator 15, a pressure setter 16, a pressure sensor 17 and a fluid overflow valve 18, a floating liquid pressure plate 4, a magnetic liquid level indicator 7, a floating magnetic pole 5, an ultrasonic transmitting probe 2, an ultrasonic receiving probe 3 and a data acquisition system 8; the floating liquid pressure plate 4 is arranged in the inner cavity of the detection tube 1, and the floating liquid pressure plate 4 can cover the surface of the crude oil in the detection tube 1. A guide rod 6 for guiding the floating liquid pressure plate 4 is arranged in the detection tube 1 along its axial direction, and the lower end of the guide rod 6 is fixedly connected to the bottom of the detection tube 1. A through hole for the guide rod 6 to pass through is opened on the floating liquid pressure plate 4, and the floating liquid pressure plate 4 is sleeved on the guide rod 6 through the through hole and can move freely along the guide rod 6, and two guide rods are arranged along the guide rod 6. The magnetic liquid level indicator 7 is arranged on one side of the outside of the detection tube 1 and is arranged parallel to the detection tube 1, and the floating magnetic pole 5 is arranged on the floating liquid pressure plate 4. A plurality of ultrasonic transmitting probes 2 and ultrasonic receiving probes 3 are arranged, and the plurality of ultrasonic transmitting probes 2 are spaced apart in the axial direction of the detection tube 1, and the plurality of ultrasonic receiving probes 3 are arranged opposite to the ultrasonic transmitting probes 2 one by one, and the ultrasonic transmitting probes 2 and the ultrasonic receiving probes 3 are connected to the data acquisition system 8. An air inlet is arranged at the top of the detection tube 1, and the outlet of the high-pressure gas tank 12 is connected to the air inlet of the detection tube 1 through a first pipeline, and the air flow stop valve 14 and the gas flow integrator 15 are arranged on the first pipeline, and the air flow stop valve 14 is located upstream of the gas flow integrator 15, and the pressure setter 16 is connected to the air inlet of the detection tube 1, and the air inlet of the detection tube 1 is also connected to the second pipeline, and the pressure sensor 17 and the fluid overflow valve 18 are arranged on the second pipeline, and the pressure sensor 17 is arranged between the fluid overflow valve 18 and the air inlet of the detection tube 1. A liquid inlet is provided at the bottom of the detection tube 1, and the liquid inlet of the detection tube 1 is connected to a third pipeline and a fourth pipeline. The third pipeline is provided with a fluid drain valve 9, and the fourth pipeline is provided with a connecting valve 10. The inlet end of the fourth pipeline is connected to a transfer tube 11 for connecting with the outlet of the standard volume tube.

[0040] When the standard volume tube is used to perform real liquid calibration on the crude oil flow meter, the defoamer, crude oil flow meter and standard volume tube are connected in series on the pipeline. After the incoming oil flows through these components and returns to the oil pipeline, the real liquid gas content of the crude oil can be detected, which is convenient and accurate.

[0041] Specifically, Figure 2 As shown, the process of performing the crude oil gas detection method by the crude oil gas detection device of this embodiment is as follows:

[0042] Connect the transfer tube 11 with the outlet of the standard volume tube 21, close the fluid drain valve 9, open the air flow stop valve 14, adjust the opening of the fluid overflow valve 18, and control the air pressure in the detection tube 1 to be the same as the pressure of the crude oil in the oil pipeline; the detection tube 1 is placed vertically, open the connecting valve 10, and the crude oil flowing out of the crude oil flow meter 22 received by the standard volume tube 21 is passed into the detection tube 1 from the liquid inlet of the detection tube 1 through the crude oil outlet of the standard volume tube 21 until the detection tube 1 is filled with crude oil. In the process of filling the detection tube 1 with crude oil, the floating liquid pressure plate 4 rises with the rise of the crude oil level, and the magnetic liquid level indicator 7 senses the floating magnetic pole 5. The position and real-time display of the liquid level in the detection tube 1, and the air pressure in the detection tube 1 is controlled to be the same as the pressure of the crude oil in the oil pipeline by adjusting the fluid overflow valve 18 and the pressure setter 16; when the detection tube 1 is full of crude oil, it is allowed to stand still, and the fluid overflow valve 18 is closed at this time, and only the pressure setter 16 is used to control the air pressure in the detection tube 1 to be the same as the pressure of the crude oil in the oil pipeline, so that the distribution state of the crude oil in the detection tube 1 is stable and the temperature of the crude oil is the same as the temperature of the crude oil in the oil pipeline, and then the signal obtained by the data acquisition system 8 is used to determine whether the crude oil in the detection tube 1 contains micro-scale bubbles.

[0043] When the test is completed, the connecting valve 10 and the air flow stop valve 14 are closed to disconnect the liquid inlet of the test tube 1 from the passage of the standard volume tube 21, and then the fluid overflow valve 18 and the fluid drain valve 9 are opened to drain the crude oil in the test tube 1 for the next test.

[0044] The pressure control components of the pressure setter provided in the present invention can limit the pressure in the detection tube, avoid the sudden pressure drop that causes the crude oil to release more dissolved gas in the detection tube, and ensure that the dissolved gas content in the detection tube is the same as the dissolved gas content on the oil pipeline. The ultrasonic method is usually used to measure the flow rate of the fluid, but it has not been used to detect trace gas in crude oil so far. Two sets of sound velocity data are obtained at two different times. By performing a t test on the two sets of sound velocity data, it is determined whether there is a significant difference in the sound velocity at different positions of the detection tube height, and whether the actual crude oil contains bubbles with a size of less than 1 mm. The detection results of the present invention can provide a basis for correcting the calibration results of the standard volume tube for the crude oil flowmeter.

Claims

1. A crude oil gas detection device used in conjunction with a standard volume tube, characterized in that: It comprises a detection tube (1), a pressure control component, a floating liquid pressure plate (4), a liquid level gauge and a bubble detection unit; A floating liquid pressure plate (4) is arranged in the inner cavity of the detection tube (1), and the floating liquid pressure plate (4) can cover the surface of the crude oil in the detection tube (1). An air inlet is arranged at the top of the detection tube (1), and the pressure control component is connected to the air inlet at the top of the detection tube (1); the pressure control component is used to supply air into the detection tube (1), so that the pressure on the crude oil below the floating liquid pressure plate (4) is the same as the pressure of the crude oil in the oil pipeline; The bottom of the detection tube (1) is provided with a liquid inlet, which can be connected to the outlet of the standard volume tube through a pipeline; The detection tube (1) is provided with a temperature sensor (19) for detecting the temperature of the crude oil; The liquid level meter is used to detect the liquid level of crude oil in the detection tube (1); the bubble detection unit is arranged on the detection tube (1); and the bubble detection unit is used to detect whether the crude oil in the detection tube (1) contains micro-scale bubbles.

2. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 1, characterized in that: A guide rod (6) for guiding a floating liquid pressure plate (4) is provided in the detection tube (1) along its axial direction. The upper end of the guide rod (6) is fixedly connected to the top of the detection tube (1), and the lower end of the guide rod (6) is fixedly connected to the bottom of the detection tube (1). A through hole for the guide rod (6) to pass through is provided on the floating liquid pressure plate (4). The floating liquid pressure plate (4) is sleeved on the guide rod (6) through the through hole and can move freely along the guide rod (6).

3. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 2, characterized in that: At least two guide rods (6) are provided, and all the guide rods (6) are symmetrically distributed about the axis of the detection tube (1).

4. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 1, characterized in that: The liquid level meter comprises a magnetic liquid level indicator (7) and a floating magnetic pole (5) adapted to the magnetic liquid level indicator (7); the magnetic liquid level indicator (7) is arranged on one side outside the detection tube (1) and parallel to the detection tube (1); and the floating magnetic pole (5) is arranged on a floating liquid pressure plate (4).

5. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 1, characterized in that: The bubble detection unit comprises an ultrasonic transmitting probe (2), an ultrasonic receiving probe (3) and a data acquisition system (8); the ultrasonic transmitting probe (2) and the ultrasonic receiving probe (3) are both connected to the data acquisition system (8); the ultrasonic transmitting probe (2) and the ultrasonic receiving probe (3) are arranged on the detection tube (1) and are symmetrically arranged about the axis of the detection tube (1); the ultrasonic receiving probe (3) is directly opposite to the ultrasonic transmitting probe (2).

6. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 5, characterized in that: A plurality of ultrasonic transmitting probes (2) and ultrasonic receiving probes (3) are provided. The plurality of ultrasonic transmitting probes (2) are spaced apart in the axial direction of the detection tube (1), and the plurality of ultrasonic receiving probes (3) are arranged opposite to the ultrasonic transmitting probes (2).

7. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 1, characterized in that: The pressure control component comprises an inert gas source, an air flow stop valve (14), a gas flow integrator (15), a pressure setter (16), a pressure sensor (17) and a fluid overflow valve (18); the outlet of the inert gas source is connected to the air inlet of the detection tube (1) through a first pipeline; the air flow stop valve (14) and the gas flow integrator (15) are arranged on the first pipeline; the air flow stop valve (14) is located upstream of the gas flow integrator (15); the pressure setter (16) is connected to the air inlet of the detection tube (1); the air inlet of the detection tube (1) is also connected to a second pipeline; the pressure sensor (17) and the fluid overflow valve (18) are arranged on the second pipeline; the pressure sensor (17) is arranged between the fluid overflow valve (18) and the air inlet of the detection tube (1).

8. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 7, characterized in that: The inert gas source is a high-pressure gas tank (12), and a high-pressure gas pressure reducing valve (13) is provided at the outlet of the high-pressure gas tank (12).

9. The crude oil gas detection device used in conjunction with a standard volume tube according to claim 1, characterized in that: The liquid inlet of the detection tube (1) is connected to a third pipeline and a fourth pipeline, the third pipeline is provided with a fluid drain valve (9), the fourth pipeline is provided with a connecting valve (10), and the inlet end of the fourth pipeline is connected to a transfer tube (11) for connecting with the outlet of the standard volume tube.

10. A method for detecting gas content in crude oil, characterized in that: The crude oil gas content detection method is carried out by using the crude oil gas content detection device used in conjunction with the standard volume tube as described in any one of claims 1 to 9, and comprises the following process: The liquid inlet of the detection tube (1) is connected to the outlet of the standard volume tube (21), and the air pressure in the detection tube (1) is controlled by a pressure control component to be the same as the pressure of the crude oil in the oil pipeline; the crude oil flowing out of the crude oil flow meter (22) received by the standard volume tube (21) is then passed into the detection tube (1) from the liquid inlet of the detection tube (1) through the crude oil outlet of the standard volume tube (21) until the detection tube (1) is filled with crude oil. During the process of filling the detection tube (1) with crude oil, the air pressure in the detection tube (1) is controlled by the pressure control component to be the same as the pressure of the crude oil in the oil pipeline; when the detection tube (1) is filled with crude oil, it is left to stand, so that the distribution state of the crude oil in the detection tube (1) is stable and the temperature of the crude oil is the same as the temperature of the crude oil in the oil pipeline, and then a bubble detection unit is used to detect whether the crude oil in the detection tube (1) contains micro-scale bubbles.

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