CN115506775A - Oil-water-gas multi-phase flow array type measuring device and application thereof - Google Patents

Abstract

The invention relates to the technical field of oil-water-gas three-phase fluid measurement equipment manufacturing, in particular to an oil-water-gas multiphase flow array measurement device with reasonable structure and low cost and its application, which is characterized in that it is located at the output of the oil well The oil well output fluid input pipeline (4) below the liquid input port (101) is provided with a three-way joint (45), and one output end of the three-way joint (45) passes through the liquid inlet pipeline (401) and the oil well output fluid. The input port (101) is connected, and the other output port is connected to the discharge pipeline (2) through the bypass pipeline (5), or connected to the exhaust and discharge confluence pipeline, and the exhaust and liquid discharge confluence pipeline is The pipeline after the confluence of the discharge pipeline and the exhaust pipeline; compared with the traditional pumping scheme, on the premise of significantly reducing the structural complexity and device cost, the three-phase flow itself is used to precipitate gas and control the process to realize It ensures the emptying of the metering tank, and ensures the accuracy and stability of the oil-water ratio and the liquid and gas volume measured by the array method.

Description

Oil-water-gas multiphase flow array measurement device and its application

Technical field:

The invention relates to the technical field of oil-water-gas three-phase fluid measurement equipment manufacturing, in particular to an oil-water-gas multiphase flow array measurement device with reasonable structure and low cost and its application.

Background technique:

In oil production, accurate and stable monitoring of three phases of oil, water, and gas is the basis for increasing revenue and reducing expenditure in oil fields and digital production. There is no automatic measurement technology at home and abroad that can meet the changing environment of the oil field and the cost-effective products are popularized. Basically, the time-consuming and laborious measurement of liquid and gas in tanks and manual sampling to measure water content are used to meet the needs of production, such as the patent The technical solutions described in CN200520123346.7 and the like.

A Chinese patent 201280001771.1 previously proposed by the inventor of this patent proposes a metering device for the oil content of oil well output fluid, which includes a vertical metering separation tank, and oil well output Liquid input pipeline, liquid discharge pipeline, and exhaust pipeline. Liquid inlet valves, liquid discharge valves, and exhaust valves are respectively installed on the oil well output fluid input pipelines, liquid discharge pipelines, and exhaust pipelines; At different specified heights in the vertical direction of the metering separation tank, a number of independent and interrelated oil-water analysis and measurement probes are installed from bottom to top. Through the oil-water analysis and measurement array composed of these probes, not only the real-time measurement The oil-water ratio of each oil-water layer can be used to obtain the total water content of the oil well production required for oil field production. It can also measure the liquid production and gas production of the oil well per unit time by monitoring the real-time changes in the liquid level in the metering separation tank. It is referred to as array oil well three-phase measurement method. Since the above scheme needs to measure the composition of oil and water in the tank, the entire metering separation tank needs to be emptied when each measurement is completed, and the bottom water or residual liquid cannot be left in the metering tank like the existing liquid and gas measuring technology, but it is used for The drained three-phase fluid is always accompanied by oil, water and gas. During the draining process, the residual liquid hanging on the inner wall of the metering tank also flows down continuously, which makes the existing metering tank draining technology unable to empty the metering tank. Therefore, For the liquid discharge of patent 201280001771.1, the existing solution is to use a liquid discharge pump to discharge the liquid, so that the liquid in the metering separation tank can be emptied after the liquid inlet valve is closed. However, the addition of the drainage pump significantly increases the complexity of the mechanical structure and power distribution. At the same time, it increases the cost, reduces the safety and reliability of the measurement system, and limits the development of its automatic measurement function. Watchdog function requirements.

Invention content:

Aiming at the shortcomings and deficiencies in the prior art, the invention proposes an oil-water-gas multiphase flow array measurement device with reasonable structure and low cost and its application.

The present invention reaches through the following measures:

An oil-water-gas multiphase flow array type measurement device is provided with a vertical measurement separation tank (1), the upper side of the measurement separation tank (1) is provided with an oil well output fluid input port (101), and the measurement separation tank ( 1) is provided with a liquid output port (102) at the bottom, and a gas output port (103) is provided at the top of the metering separation tank (1), and the oil well output liquid input port is connected with the oil well production liquid input pipeline (4), and the liquid output The outlet is connected to the discharge pipeline (2), the gas output port is connected to the exhaust pipeline (3), the discharge valve (201) is installed on the discharge pipeline, and the exhaust valve (301) is installed on the exhaust pipeline. The tank is also provided with an oil-water analysis and measurement array (105) composed of multiple probes, characterized in that an oil well output fluid input pipeline (4) located below the oil well output fluid input port (101) is provided with There is a three-way joint (45), one output end of the three-way joint (45) is connected to the oil well output fluid input port (101) through the liquid inlet pipeline (401), and the other output end is connected to the oil well output fluid input port (101) through the bypass pipeline (5) The liquid discharge pipeline (2) is connected, or connected with the exhaust and liquid discharge confluence pipeline, and the exhaust and liquid discharge confluence pipeline is a pipeline after the liquid discharge pipeline and the exhaust pipeline converge; the tee joint (45 ) is connected with the drain pipeline (5) with a bypass valve (501), and the drain pipeline (2) and the exhaust pipeline (3) are respectively equipped with a drain valve (201 ), the exhaust valve (301), the junction of the bypass line (5) and the drain line (2) is behind the drain valve (201).

Among the multiple probes of the oil-water analysis and measurement array (105) of the present invention, the probe near the bottom is used as a liquid level switch for liquid discharge alarm.

There is a predetermined height difference between the oil well output fluid input port (101) of the present invention and the tee joint (45), and the predetermined height difference of the present invention is set large enough so that when the bypass pipe is opened, the liquid inlet pipe Pressure fluctuations in the pipeline will not cause the liquid to overflow into the input port of the separation tank; further, the range of the predetermined height difference may be 5cm-500cm.

In order to make the emptying operation more accurate and timely in the present invention, an auxiliary measuring tank ( 6), the high point of the liquid outlet of the auxiliary measuring tank (6) is lower than the high point of the liquid inlet by a predetermined height, further, the predetermined height can be 2.5 to 50 cm, and the auxiliary measuring tank (6) is also provided with a liquid A level sensor (601) is used to indicate the change of the liquid level in the tank.

In order to reduce the instantaneous overflow caused by the change of well pressure during the well changing operation, the present invention connects the pressure regulating buffer tank (402) in series on the liquid inlet pipeline (401), and the pressure regulating buffer tank (402) has a predetermined Volume, further, the predetermined volume can be 0.5-50 liters, which is used to buffer the impact of instantaneous overflow caused by the pressure difference of the well transition.

In the present invention, in order to realize automatic measurement, above-mentioned each valve needs to be made as electric or pneumatic valve, and is provided with an operation and control unit (7), and operation and control unit (7) is electrically connected with each valve and each instrument, further, for Realize the continuous measurement of gas volume and liquid volume, and further, connect a gas flow meter or liquid flow meter in series on the exhaust pipeline (2) or liquid discharge pipeline (3) respectively, for expanding the measurement function, so The gas flow meter or the liquid flow meter is electrically connected with the operation and control unit.

The present invention also proposes an application of the above-mentioned oil-water-gas multiphase flow array measurement device, which is characterized in that it includes the following steps:

Step 1: In the initial state, the bypass valve (501) is in the open state, the exhaust valve (301) is in the closed state, the vertical metering separation tank (1) is filled with gas, and the oil well production fluid passes through the bypass pipeline ( 5) For external transport, the pressure inside the tank of the vertical metering separation tank (1) is balanced with the pipeline pressure;

Step 2: Liquid intake and measurement: When measuring the water content data of the oil well production fluid, close the bypass valve (501) and liquid discharge valve (201), open the exhaust valve (301), and the oil well production fluid enters the vertical metering separation tank body (1), after the gas-liquid separation in the oil well production liquid, the gas is discharged through the exhaust pipeline (3), and the liquid flows into the vertical metering separation tank (1), at this time, the liquid in the vertical metering separation tank (1) The level gradually rises, and the change and time of the liquid level are monitored in real time through the oil-water analysis array (105) or the liquid level switch, and the liquid level change in the tank for a period of time is combined with the corresponding tank capacity table to convert the oil well production fluid Before the tank is full, close the exhaust valve (301) and open the bypass valve (501), and the measured oil well production fluid will be discharged through the bypass pipeline (5), and the central control and processing unit (7) will control the oil and water Each oil-water measurement sensor on the analyzer array (105) measures the oil-water composition of the liquid thin layer corresponding to the current oil-water measurement sensor, and calculates the water content of the oil-water mixture in combination with the known tank capacity table;

When measuring the gas content of the oil well production liquid, open the liquid discharge valve (201), close the bypass valve (501) and the exhaust valve (301), the oil well production liquid enters the metering separation tank after gas-liquid separation, and the liquid flows The path (2) flows out of the metering separation tank (1), and the liquid level in the tank gradually decreases. The change of the liquid level and its time are monitored in real time through the oil-water analysis array or the liquid level switch, and the change of the liquid level for a period of time is compared with the corresponding tank capacity. Combined with the table, the gas production of the oil well can be converted;

Step 3: Empty the tank and prepare for the next measurement: at this time, the drain valve (201) is open, the bypass valve (501) and the exhaust valve (301) are closed, and the oil-water-gas mixture is being measured The gas-liquid is fully separated in the tank, and the liquid can be quickly discharged through the liquid discharge pipeline (2). When the liquid level in the metering separation tank (1) reaches the liquid level setting value, the bypass valve (501) is opened , and keep the original state of the liquid discharge valve (201) and the exhaust valve (301) unchanged, wherein the liquid level setting value is at the lower part of the tank body of the metering separation tank (1), and the liquid level setting value is greater than the metering separation tank (1). The liquid level in the tank (1) is the lowest value. At this time, most of the oil well production fluid is exported through the bypass pipeline (5), and the part precipitated from the oil well production fluid input pipeline (4) and the bypass pipeline (5) Under the dual effects of the kinetic energy of the three-phase flow itself and the difference in gas-liquid density, the gas continues to enter the metering separation tank (1) upward along the liquid inlet pipeline (401), and uses the gas without liquid to push the remaining liquid and the wall-mounted liquid slowly. Discharge the metering separation tank (1), and this process is also at the junction (25) or (23) of the discharge line (2) and the bypass line (5), with the primary Effort effect strengthens the discharge of liquid. At this time, the liquid level in the tank continues to drop until the liquid level switch located at the bottom of the metering separation tank (1) or the small buffer measuring tank located in the discharge pipeline (2) When the liquid level gauge shows an alarm signal, all the residual liquid inside the metering separation tank (1) is discharged, and the liquid discharge valve (201) is closed, thereby ensuring that the metering separation tank is in a state of emptying and draining, and a complete measurement is completed. process and is ready for the next measurement.

Step 2 of the present invention also includes when performing continuous gas parameter measurement or liquid parameter measurement, using a flowmeter connected in series on the exhaust pipeline (2) to continuously measure the gas flow, or using a flowmeter connected in series on the discharge pipeline ( 2) The liquid flowmeter method for continuously measuring liquid flow: through coordinated control of the exhaust valve or liquid discharge valve, the gas and liquid are stably separated in the metering separation tank (1), and the gas flow or liquid flow is continuously read at the same time. When the metering separation tank (1) plays the role of a gas-liquid separator, the total liquid level in the metering separation tank should be controlled to a continuous level by adjusting the drain valve (201) or the exhaust valve (301) at the end of the continuous measurement. Measure the initial liquid level to eliminate unnecessary errors.

The tank emptying method in the oil-water-gas multiphase flow array measuring device according to the present invention includes opening the bypass valve (501) when the liquid in the metering separation tank (1) reaches the set value, and keeping The original state of the drain valve (201) and the exhaust valve (301) remains unchanged. At this time, most of the oil well production liquid is transported outside through the bypass pipeline (5), and the oil well production fluid input pipeline (4) and the bypass pipe Part of the gas precipitated in the road (5) is under the dual action of the kinetic energy of the three-phase flow itself and the gas-liquid density difference, and continues to enter the metering separation tank (1) along the liquid inlet pipeline (401), and is pushed by the gas without liquid. The remaining liquid and wall-hanging liquid are slowly discharged from the metering separation tank (1). At this time, the liquid level in the tank continues to drop. When the liquid level gauge on the buffer measuring tank shows an alarm signal, all the residual liquid inside the metering separation tank (1) is discharged, and the liquid discharge valve (201) is closed, thereby ensuring that the metering separation tank is in the state of being emptied and drained. Completed a complete measurement process and prepared for the next measurement.

Compared with the traditional pumping scheme, the present invention realizes the emptying and cleaning of the metering tank by using the three-phase flow itself to precipitate gas and control the process on the premise of significantly reducing the structural complexity and device cost, ensuring the use of the array The method measures the oil-water ratio and the liquid and gas volume accurately and stably; at the same time, because the complex pumping system is omitted, not only the failure points are significantly reduced, but the liquid discharge can be guaranteed at other times except for the short time of specific measurement At least one of the valves or exhaust valves is in an open state. For oil well production, an external transmission path is formed, which significantly improves the safety of the measurement system and meets the requirements of remote control and unattended on-site.

Description of drawings:

Accompanying drawing 1 is a kind of structural representation of the present invention.

Accompanying drawing 2 is a kind of structure schematic diagram with small auxiliary measuring tank and pressure regulating buffer tank of the present invention.

Accompanying drawing 3 is the schematic diagram of small and medium-sized auxiliary measuring tank of the present invention.

Accompanying drawing 4 is a kind of structure schematic diagram with pressure regulating buffer tank and continuous measurement gas or liquid flow meter of the present invention.

Reference signs: metering separation tank (1), oil well production liquid input port (101), liquid discharge port (102), exhaust port (103), sampling port (104), oil-water analyzer array (105), temperature variable transmitter (106), pressure transmitter (107), drain line (2), drain valve (201), liquid flow meter (202), exhaust line (3), exhaust valve (301) , gas flow meter (302), production liquid input pipeline (4), liquid inlet pipeline section (401), pressure regulating buffer tank (402), bypass pipeline (5), bypass valve (501), auxiliary measuring tank (6), liquid level sensor (601), central control and processing unit (7), discharge and bypass pipeline junction (25), tee joint (45), gas-liquid pipeline junction (23).

detailed description:

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1:

As shown in accompanying drawing 1, this example proposes a kind of oil-water-gas multiphase flow array type measurement device, is provided with vertical measurement separation tank (1), and the upper side of measurement separation tank (1) is provided with oil well production fluid input port ( 101), the lower part of the metering separation tank (1) is provided with a liquid discharge port (102), the top of the metering separation tank (1) is provided with an exhaust port (103), and the oil well production liquid input port (101) is connected to the oil well production liquid input pipeline , the drain port (102) is connected to the drain line (2), the exhaust port (103) is connected to the exhaust line (3), the drain line (2) is provided with a drain valve (201), and the exhaust An exhaust valve (301) is provided on the pipeline (3), an oil-water analyzer array (105) consisting of several probes is provided on the metering separation tank (1), and three One output end of the three-way joint (45) is connected with the oil well liquid production input port (101), and the other output end is connected with the liquid discharge pipeline (2), and then connected with the exhaust liquid discharge line. The confluence pipeline is connected, and the exhaust and liquid discharge confluence pipeline is a pipeline after the confluence of the discharge pipeline (2) and the exhaust pipeline (3);

Wherein the pipeline between the three-way joint (45) and the oil well liquid production input port (101) is the liquid inlet pipe section (401), and the pipe section connected between the three-way joint (45) and the liquid discharge pipeline (2) is the bypass pipe section. The bypass line (5), the bypass line (5) is provided with a bypass valve (501), and the connection between the tee joint (45) and the drain line (2) is located before the drain valve (201); There is a height difference between the oil well production fluid input port (101) and the tee joint (45), and the range of the height difference is 5cm-500cm.

In this example, one output end of the tee joint (45) on the oil well output fluid input pipeline is connected to the oil well output fluid input port, and the other output end is connected to the drainage pipeline (2), and then connected to the drainage pipeline (2). The gas and liquid converging pipeline is connected, and the exhaust and liquid converging pipeline is a pipeline after the confluence of the liquid discharge pipeline and the exhaust pipeline. The timing of closing the drain valve (201) is judged by the signal sent out;

After the measurement is completed, the oil-water-gas mixture is fully separated from the gas and liquid in the metering tank and the liquid is pushed out through the liquid discharge pipeline (2), and the bypass is opened when the liquid in the metering separation tank (1) reaches the set value Valve, keeping the original state of the liquid discharge valve and exhaust valve unchanged, most of the oil well production fluid is transported outside through the bypass pipeline (5), and precipitated from the production fluid input pipeline (4) and the bypass pipeline (5) Under the double action of the kinetic energy of the three-phase flow itself and the difference in gas-liquid density, part of the gas continues to enter the metering separation tank (1) upward along the liquid inlet pipeline (401), and the remaining liquid and the hanging wall are pushed by the gas without liquid. The liquid is slowly discharged from the metering separation tank (1), and the liquid level continues to drop. When the liquid level sensor at the bottom of the metering separation tank (1) shows an alarm signal, all the residual liquid inside the metering separation tank (1) is discharged and closed in time. The drain valve (201) ensures that the metering separation tank (1) is in an empty and drained state, completes a complete measurement process, and is ready for the next measurement.

Example 2:

This example has the same vertical metering separation tank structure as that of Example 1, as shown in Figure 2. In this example, in order to make the emptying operation more accurate and timely, behind the drain valve (201) and the bypass pipe An auxiliary measuring tank (6) is connected in series on the drain line (2) before the intersection of the road (5) as shown in Figure 3, the high point of the liquid outlet of the auxiliary measuring tank (6) is lower than the height of the liquid inlet Between the point 2.5 and 50cm, there is also a liquid level sensor on the auxiliary measuring tank (6), which is used to indicate the change of the liquid level in the tank;

During work, the timing of closing the drain valve (201) is judged by the signal provided by the liquid level sensor located on the small auxiliary measuring tank (6), and the drain and control are more reliable and stable.

Example 3:

This example has the same vertical metering and separation tank structure as Example 1. In this example, in order to reduce the instantaneous overflow caused by the change of well pressure during the well replacement operation, the pressure regulation is connected in series on the liquid inlet section (401) Buffer tank (402) (as shown in accompanying drawing 4), its volume is at 0.5～50 liters, is used for buffering the instantaneous overflow effect that causes because of the pressure difference of turning well;

In order to realize automatic measurement, the valves in this example are set as electric or pneumatic valves, and a calculation and control unit is provided. The calculation and control unit is electrically connected with each valve and each instrument. In order to realize the continuous measurement of gas volume and liquid volume, A gas flow meter or a liquid flow meter (as shown in accompanying drawing 4) is connected in series respectively on the described exhaust pipeline or the liquid discharge pipeline, and is used for expanding the measurement function, and the gas flow meter or the liquid flow meter is connected with The operation is electrically connected with the control unit.

In this example, the oil-water-gas multiphase flow array measurement device is used as follows:

In the initial state: the bypass valve (501) is open, the exhaust valve (301) is closed, the vertical metering separation tank (1) is filled with gas, and the oil well production fluid passes through the bypass pipeline (5) For external transportation, the internal pressure of the vertical metering separation tank (1) is balanced with the pipeline pressure;

When measuring the water content data of the oil well production fluid, close the bypass valve (501), open the exhaust valve (301), the oil well production fluid enters the vertical metering separation tank (1), and after the gas-liquid separation in the oil well production fluid, the gas The liquid is discharged through the exhaust pipeline (3), and the liquid flows into the vertical metering separation tank (1). At this time, the liquid level in the vertical metering separation tank (1) gradually rises. The switch monitors the change of the liquid level and its time in real time, and the change of the liquid level in the tank for a period of time is combined with the corresponding tank capacity meter to convert the liquid production of the oil well; before the tank is full, close the exhaust valve (301), Open the bypass valve (501), and the measured oil well production fluid is discharged through the bypass pipeline (5), and the central control and processing unit (7) controls each oil-water measurement sensor on the oil-water analyzer array (105) to measure the The oil-water composition of the liquid thin layer corresponding to the current oil-water measurement sensor, combined with the known tank capacity table, cumulatively calculates the water content of the oil-water mixture;

When measuring the gas content of the oil well production liquid, open the liquid discharge valve (201), close the bypass valve (501) and the exhaust valve (301), the oil well production liquid enters the metering separation tank after gas-liquid separation, and the liquid flows The path (2) flows out of the metering separation tank (1), and the liquid level in the tank gradually decreases. The change of the liquid level and its time are monitored in real time through the oil-water analysis array or the liquid level switch, and the change of the liquid level for a period of time is compared with the corresponding tank capacity. Combined with the table, the gas production of the oil well can be converted;

When performing continuous gas parameter measurement or liquid parameter measurement, use the flowmeter connected in series to the exhaust pipeline (2) to continuously measure the gas flow, or use the liquid flowmeter connected in series to the discharge pipeline (2) to continuously measure the gas flow. The method of measuring liquid flow: through coordinated control of the exhaust valve or liquid discharge valve, the gas and liquid are stably separated in the metering separation tank (1), and at the same time, the gas flow or liquid flow is continuously read. At this time, the metering separation tank (1) It plays the role of a gas-liquid separator. At the end of continuous measurement, the total liquid level in the metering separation tank should be controlled to the initial liquid level of continuous measurement by adjusting the drain valve (201) or exhaust valve (301). , to eliminate unnecessary errors;

After the measurement is completed, the tank is emptied to prepare for the next measurement: the oil-water-gas mixture is fully separated from the gas and liquid in the metering tank, and the liquid can be pushed out through the discharge pipeline (2), specifically: in the metering separation When the liquid in the tank (1) reaches the set value, open the bypass valve (501), and keep the original state of the drain valve (201) and exhaust valve (301) unchanged. The pipeline (5) is exported, and part of the gas precipitated from the oil well production fluid input pipeline (4) and the bypass pipeline (5) flows upwards and along the The liquid pipeline (401) continues to enter the metering separation tank (1), and uses the gas without liquid to push the remaining liquid and wall-mounted liquid out of the metering separation tank (1) slowly. When the liquid level switch at the bottom of the separation tank (1) or the liquid level gauge on the small buffer measuring tank in the discharge line (2) displays an alarm signal, all the residual liquid in the measurement separation tank (1) will be discharged and closed. The drain valve (201) ensures that the metering separation tank is in an empty and drained state, completes a complete measurement process, and is ready for the next measurement.

Compared with the traditional pumping scheme, the present invention does not need a permanent valve at the input port of the metering separation tank, and its function is that on the one hand, the associated gas that spontaneously ignites and precipitates in the pipeline can be fully utilized to realize the emptying of the metering tank. On the other hand, in addition to the short time of specific measurement, other times can ensure that at least one of the drain valve or exhaust valve is in an open state. For oil well production, an external delivery path is formed, which significantly improves The safety of the measurement system is adapted to the requirements of remote control and unattended on-site. Specifically, compared with the original pumping technology, it has the following advantages: (1) The optimized and simple equipment structure significantly reduces the equipment cost At the same time, it reduces the failure point and maintenance workload, improves the safety and reliability of measurement and control, and can meet the requirements of remote control and unattended functions. (2) The technical solution adopts the imported normally open structure, which reduces the impact of the water hammer effect on the equipment and pipelines caused by the downturning of the measurement well, and further improves the safety of the equipment and pipelines. (3) The characteristics of the three-phase fluid itself are fully utilized for liquid drainage, and the effects of control, emptying, and net drainage are stable and reliable. (4) The continuous measurement function of gas volume and liquid volume is added to meet the further needs of the oil field.

Claims (13)

1. An oil-water-gas multiphase flow array type measurement device is provided with a vertical metering separation tank (1), the upper side of the metering separation tank (1) is provided with an oil well output fluid input port (101), and the metering separation tank The lower part of the body (1) is provided with a liquid output port (102), the top of the metering separation tank (1) is provided with a gas output port (103), and the oil well production liquid input port is connected with the oil well production liquid input pipeline (4), The liquid output port is connected to the discharge pipeline (2), the gas output port is connected to the exhaust pipeline (3), the liquid discharge pipeline is provided with a liquid discharge valve (201), and the exhaust pipeline is provided with an exhaust valve (301), The metering separation tank is also provided with an oil-water analysis and measurement array (105) composed of multiple probes, characterized in that the oil well production fluid input pipeline (4) located below the oil well production fluid input port (101) A three-way joint (45) is provided on the top, one output end of the three-way joint (45) is connected with the oil well output fluid input port (101) through the liquid inlet pipeline (401), and the other output end is connected through the bypass pipeline (5 ) is connected to the liquid discharge pipeline (2), or connected to the exhaust and liquid discharge confluence pipeline, and the exhaust and liquid discharge confluence pipeline is a pipeline after the confluence of the liquid discharge pipeline and the exhaust pipeline; the three-way joint (45) A bypass valve (501) is provided on the bypass pipeline (5) connected to the discharge pipeline, and a discharge valve is respectively provided on the discharge pipeline (2) and the exhaust pipeline (3) (201), the exhaust valve (301), the junction of the bypass line (5) and the drain line (2) is located behind the drain valve (201). 2. The oil-water-gas multiphase flow array measuring device according to claim 1, characterized in that, the probe near the bottom in the plurality of probes of the oil-water analysis and measurement array (105) is used as a liquid level switch, Used for liquid discharge alarm. 3. The oil-water-gas multiphase flow array measurement device according to claim 1, characterized in that there is a predetermined height difference between the oil well production fluid input port (101) and the tee joint (45). 4. An oil-water-gas multiphase flow array measurement device according to claim 1, characterized in that the drain line behind the drain valve (2) and before the intersection with the bypass line (5) (2) An auxiliary measuring tank (6) is connected in series, and the high point of the liquid outlet of the auxiliary measuring tank (6) is lower than a predetermined height of the high point of the liquid inlet, and a liquid level is also provided on the auxiliary measuring tank (6). A sensor (601) for indicating changes in liquid level in the tank. 5. The oil-water-gas multiphase flow array measuring device according to claim 1, characterized in that, the pressure regulating buffer tank (402) is connected in series on the described liquid inlet pipeline (401), and the pressure regulating buffer tank ( 402) having a predetermined volume can buffer the impact of instantaneous overflow caused by the well transition pressure difference. 6. The oil-water-gas multiphase flow array measurement device according to claim 1, characterized in that a gas flowmeter is connected in series on the exhaust pipeline (2) or the liquid discharge pipeline (3) respectively or a liquid flowmeter for expanding the measurement function, and the gas flowmeter or liquid flowmeter is electrically connected to the calculation and control unit. 7. The oil-water-gas multiphase flow array measurement device according to claim 3, characterized in that the height difference is set large enough so that when the bypass pipeline is opened, pressure fluctuations in the liquid inlet pipeline will not cause the liquid to overflow into the separation tank inlet (101). 8. The oil-water-gas multiphase flow array measurement device according to claim 7, characterized in that the range of height difference is 5cm-500cm. 9. The oil-water-gas multiphase flow array measurement device according to claim 4, characterized in that the predetermined height is 2.5-50 cm. 10. The oil-water-gas multiphase flow array measurement device according to claim 5, characterized in that the predetermined volume is 0.5-50 liters. 11. An application of the oil-water-gas multiphase flow array measurement device as described in any one of claims 1-6, characterized in that it comprises the following steps: Step 1: In the initial state, the bypass valve (501) is in the open state, the exhaust valve (301) is in the closed state, the vertical metering separation tank (1) is filled with gas, and the oil well production fluid passes through the bypass pipeline ( 5) For external transport, the pressure inside the tank of the vertical metering separation tank (1) is balanced with the pipeline pressure; Step 2: Liquid intake and measurement: When measuring the water content data of the oil well production fluid, close the bypass valve (501) and liquid discharge valve (201), open the exhaust valve (301), and the oil well production fluid enters the vertical metering separation tank body (1), after the gas-liquid separation in the oil well production liquid, the gas is discharged through the exhaust pipeline (3), and the liquid flows into the vertical metering separation tank (1), at this time, the liquid in the vertical metering separation tank (1) The level gradually rises, and the change and time of the liquid level are monitored in real time through the oil-water analysis array (105) or the liquid level switch, and the liquid level change in the tank for a period of time is combined with the corresponding tank capacity table to convert the oil well production fluid Before the tank is full, close the exhaust valve (301) and open the bypass valve (501), and the measured oil well production fluid will be discharged through the bypass pipeline (5), and the central control and processing unit (7) will control the oil and water Each oil-water measurement sensor on the analyzer array (105) measures the oil-water composition of the liquid thin layer corresponding to the current oil-water measurement sensor, and calculates the water content of the oil-water mixture in combination with the known tank capacity table; When measuring the gas content of the oil well production liquid, open the liquid discharge valve (201), close the bypass valve (501) and the exhaust valve (301), the oil well production liquid enters the metering separation tank after gas-liquid separation, and the liquid flows The path (2) flows out of the metering separation tank (1), and the liquid level in the tank gradually decreases. The change of the liquid level and its time are monitored in real time through the oil-water analysis array or the liquid level switch, and the change of the liquid level for a period of time is compared with the corresponding tank capacity. Combined with the table, the gas production of the oil well can be converted. Step 3: Empty the tank and prepare for the next measurement: at this time, the drain valve (201) is open, the bypass valve (501) and the exhaust valve (301) are closed, and the oil-water-gas mixture is being measured The gas-liquid is fully separated in the tank, and the liquid can be quickly discharged through the liquid discharge pipeline (2). When the liquid level in the metering separation tank (1) reaches the liquid level setting value, the bypass valve (501) is opened , and keep the original state of the liquid discharge valve (201) and the exhaust valve (301) unchanged, wherein the liquid level setting value is at the lower part of the tank body of the metering separation tank (1), and the liquid level setting value is greater than the metering separation tank (1). The liquid level in the tank (1) is the lowest value. At this time, most of the oil well production fluid is exported through the bypass pipeline (5), and the part precipitated from the oil well production fluid input pipeline (4) and the bypass pipeline (5) Under the dual effects of the kinetic energy of the three-phase flow itself and the difference in gas-liquid density, the gas continues to enter the metering separation tank (1) along the liquid inlet pipeline (401) upwards, and uses the gas without liquid to push the remaining liquid and wall-mounted liquid to slowly discharge the metering Separation tank (1), at the same time, with the help of the Bernoulli effect of fast-flowing liquid and slow-flowing liquid, the efflux of liquid is strengthened. When the level switch or the liquid level gauge on the small buffer measuring tank located in the liquid discharge pipeline (2) shows an alarm signal, the residual liquid in the metering separation tank (1) is completely discharged, and the liquid discharge valve (201) is closed, thereby ensuring In order to ensure that the metering separation tank is in the state of emptying and draining, a complete measurement process has been completed, and it is ready for the next measurement. 12. The application of a kind of oil-water-gas multiphase flow array measurement device according to claim 11, characterized in that, step 2 also includes when performing continuous gas parameter measurement or liquid parameter measurement, using The flow meter on the pipeline (2) is used to continuously measure the gas flow, or the liquid flow meter connected in series to the liquid discharge pipeline (2) is used to continuously measure the liquid flow: through coordinated control of the exhaust valve or liquid discharge valve, the Gas and liquid are stably separated in the metering separation tank (1), and at the same time, the gas flow or liquid flow is continuously read. At this time, the metering separation tank (1) acts as a gas-liquid separator. Liquid valve (201) or exhaust valve (301), control the total liquid level in the metering separation tank to the initial liquid level of continuous measurement, to eliminate unnecessary errors. 13. A method for tank emptying in the oil-water-gas multiphase flow array measurement device according to any one of claims 1-6, comprising measuring the liquid level in the separation tank (1) to reach the tank At a certain position in the inner lower part, open the bypass valve (501), and keep the original state of the drain valve (201) and exhaust valve (301) unchanged. At this time, most of the oil well production fluid passes through the bypass pipeline (5) For external transport, part of the gas precipitated from the oil well production liquid input pipeline (4) and the bypass pipeline (5) moves upward along the liquid inlet pipeline (401 ) continue to enter the metering separation tank (1), and use the liquid-free gas to push the remaining liquid and wall-mounted liquid to slowly discharge the metering separation tank (1). At this time, the liquid level in the tank continues to drop until the liquid level switch located at the bottom of the metering separation tank (1) or the liquid level gauge on the small buffer measuring tank located in the discharge pipeline (2) displays When the alarm signal is issued, the residual liquid inside the metering separation tank (1) is completely discharged, and the drain valve (201) is closed, thereby ensuring that the metering separation tank is in an empty and clean state, and a complete measurement process is completed. The second measurement is ready.

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