Single well metering device for thin oil and condensate oil

Abstract

The utility model relates to the technical field of crude oil metering, in particular to a single well metering device for thin oil and condensate oil, which comprises a first metering container and a second metering container. Lower outlets of the first metering container and the second metering container are fixedly communicated with a first liquid conveying pipeline and a second liquid conveying pipeline respectively, an upper outlet of the second metering container is fixedly communicated with a first gas phase pipeline and a second gas phase pipeline, and flowmeters with different measuring ranges are arranged on the gas phase pipelines respectively; and a first liquid level meter and a second liquid level meter are fixedly arranged on the first metering container and the second metering container respectively. The gas flow metering device is reasonable and compact in structure and convenient to use, crude oil is metered through a volumetric method, gas flow metering is achieved by switching gas flow meters with different measuring ranges on a gas phase pipeline, and the gas flow metering device has the advantages of being safe, labor-saving, simple, convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of crude oil metering, and is a single-well metering device for thin oil and condensate oil. Background Art

[0002] Crude oil is a viscous liquid that is newly mined and has not been refined or processed. The measurement of crude oil production per well is of great significance for understanding the distribution of crude oil underground in the oil field and oil production management. In addition, the production of a single crude oil well can guide different oil recovery methods. In order to facilitate oil field companies to understand the production situation in a timely manner, crude oil metering devices are usually installed at the wellhead to calculate the crude oil production.

[0003] A Chinese patent document with authorization announcement number CN209432222U discloses a crude oil metering device, comprising a support frame, the upper end of which is provided with a crude oil buffer tank, an oil-gas separation tank, and a metering tank, which are fixedly mounted on the support frame in order from top to bottom. A first vacuum pumping device vacuums the crude oil buffer tank to remove the air introduced during the crude oil injection process, and a second vacuum pumping device vacuums the oil-gas separation tank to completely expel the air mixed in the crude oil, thereby obtaining pure crude oil. After the capacity of the metering tank reaches the set amount, the stopcock is opened to discharge the crude oil. The crude oil is metered by detecting the number of times the stopcock is opened, counting, and displaying the number on a counter. This device effectively separates a large amount of air mixed in the crude oil, but it is unable to select a suitable gas metering method for measurement based on actual conditions, resulting in low gas metering accuracy.

[0004] Therefore, it is very necessary to research and invent a single well metering device that can automatically select a gas meter with an appropriate range for metering according to the measured gas volume, thereby improving the accuracy of crude oil metering. Summary of the Invention

[0005] The utility model provides a single-well metering device for thin oil and condensate oil, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of low metering selectivity and inaccurate metering in the existing crude oil single-well metering.

[0006] The technical solution of the utility model is achieved through the following measures: a single-well metering device for thin oil and condensate oil, a first metering container, a second metering container, the upper inlet of the first metering container is fixedly connected to a first oil pipeline, the lower outlet of the first metering container is fixedly connected to a first liquid pipeline, the first oil pipeline and the first upper inlet of the second metering container are fixedly connected to the second oil pipeline, the lower outlet of the second metering container and the first liquid pipeline are fixedly connected to the second liquid pipeline, the upper outlet of the second metering container and the second liquid pipeline are fixedly connected to the first liquid pipeline between the second liquid pipeline and the first liquid pipeline outlet are fixedly connected to a first gas pipeline, the first gas pipeline inlet and the first gas pipeline outlet are fixedly connected to a second gas pipeline, the bottom inlet of the first metering container is fixedly connected to a first water injection pipeline, and the bottom inlet of the second metering container is fixedly connected to a second water injection pipeline.

[0007] The following are further optimizations and / or improvements to the above utility model technical solution:

[0008] The first and second metering containers are respectively fixedly provided with a first liquid level gauge and a second liquid level gauge; the first gas pipeline between the second gas pipeline inlet and the second gas pipeline outlet is fixedly provided with a first manual valve and a first remote flow meter in sequence according to the flow direction of the medium; the second gas pipeline is fixedly provided with a second manual valve and a second remote flow meter in sequence according to the flow direction of the medium.

[0009] The first liquid level gauge and the first measuring container are fixedly connected to the first infusion line with a first drainage line, the second liquid level gauge and the second infusion line are fixedly connected to the second drainage line, the first water injection line and the first drainage line are fixedly connected to a first flushing line, and the second water injection line and the second drainage line are fixedly connected to a second flushing line.

[0010] A bridge pipeline is fixedly connected to the first oil pipeline between the first oil pipeline inlet and the second liquid pipeline and to the first liquid pipeline between the first gas phase pipeline and the second oil pipeline.

[0011] A third infusion line is fixedly connected between the first infusion line and the second infusion line between the second infusion line and the first gas phase line, and a drainage pump is fixedly installed on the third infusion line.

[0012] The first outlet on the upper part of the above-mentioned first metering container is fixedly connected to a vent pipeline, and the second outlet on the upper part of the first metering container and the second inlet on the upper part of the second metering container are fixedly connected to a gas phase communication pipeline, wherein the first outlet on the upper part of the first metering container is located above the upper inlet of the first metering container, and the second inlet on the upper part of the second metering container is located above the first inlet on the upper part of the second metering container.

[0013] A third manual valve and instrument testing equipment are fixedly installed on the first oil pipeline between the above-mentioned bridge pipeline and the second oil pipeline in sequence according to the flow direction of the medium. A first automatic valve is fixedly installed on the first oil pipeline between the second oil pipeline and the first metering container, and a safety vent valve is fixedly installed on the vent pipeline.

[0014] The above-mentioned second oil pipeline is fixedly provided with a remote temperature gauge, a first on-site pressure gauge, a first remote pressure gauge, and a second automatic valve in sequence according to the flow direction of the medium. A third automatic valve is fixedly provided on the first liquid infusion pipeline between the first metering container and the first liquid discharge pipeline, a fourth automatic valve is fixedly provided on the second liquid infusion pipeline, a fifth automatic valve is fixedly provided on the first gas phase pipeline between the second metering container and the second gas phase pipeline, a fourth manual valve is fixedly provided on the bridge pipeline, a fifth manual valve is fixedly provided on the first water injection pipeline between the inlet of the first water injection pipeline and the first flushing pipeline, a sixth manual valve is fixedly provided on the first liquid discharge pipeline between the first flushing pipeline and the first liquid infusion pipeline, a seventh manual valve is fixedly provided on the second water injection pipeline between the inlet of the second water injection pipeline and the second flushing pipeline, an eighth manual valve is fixedly provided on the second liquid discharge pipeline between the second flushing pipeline and the second liquid infusion pipeline, and a ninth manual valve is fixedly provided on the first liquid infusion pipeline between the first gas phase pipeline and the bridge pipeline.

[0015] A first one-way valve is provided on the first infusion pipeline between the second infusion pipeline and the third infusion pipeline, a second one-way valve is provided on the first infusion pipeline between the third infusion pipeline and the first gas phase pipeline, and a third one-way valve, a second on-site pressure gauge, and a second remote pressure gauge are fixedly provided on the first gas phase pipeline between the second gas phase pipeline and the first infusion pipeline in sequence according to the flow direction of the medium.

[0016] The above also includes a PLC controller, and the first liquid level gauge, the second liquid level gauge, the first automatic valve, the remote temperature gauge, the first remote pressure gauge, the second automatic valve, the third automatic valve, the fourth automatic valve, the fifth automatic valve, the first remote flow meter, the second remote flow meter, and the second remote pressure gauge are all electrically connected to the PLC controller.

[0017] The utility model has a reasonable and compact structure and is easy to use. It uses the volumetric method to measure crude oil. The measurement is performed by rotating two measuring containers relative to each other. During the measurement process, the volume flow rate is calculated by the inner diameters of the first measuring container and the second measuring container and the height of the rising liquid level. The accurate measurement of the gas flow rate is achieved by switching the gas flow meter with different ranges of the gas line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 This is a schematic diagram of the process flow of this utility model.

[0019] Attachment Figure 1The codes are as follows: 1 for the first metering container, 2 for the second metering container, 3 for the first oil pipeline, 4 for the first liquid pipeline, 5 for the second oil pipeline, 6 for the second liquid pipeline, 7 for the first gas pipeline, 8 for the first water injection pipeline, 9 for the second water injection pipeline, 10 for the first liquid level gauge, 11 for the second liquid level gauge, 12 for the first liquid discharge pipeline, 13 for the second liquid discharge pipeline, 14 for the first flushing pipeline, 15 for the second flushing pipeline, 16 for the bridge pipeline, 17 for the second gas pipeline, 18 for the third liquid transmission pipeline, 19 for the liquid discharge pump, 20 for the venting pipeline, 21 for the gas phase connecting pipeline, 22 for the third manual valve, 23 for the instrument test equipment, 24 for the first automatic valve, 25 for the second automatic valve, is a safety vent valve, 26 is a remote temperature gauge, 27 is the first on-site pressure gauge, 28 is the first remote pressure gauge, 29 is the second automatic valve, 30 is the third automatic valve, 31 is the fourth automatic valve, 32 is the fifth automatic valve, 33 is the first manual valve, 34 is the first remote flow meter, 35 is the second manual valve, 36 is the second remote flow meter, 37 is the fourth manual valve, 38 is the fifth manual valve, 39 is the sixth manual valve, 40 is the seventh manual valve, 41 is the eighth manual valve, 42 is the ninth manual valve, 43 is the first one-way valve, 44 is the second one-way valve, 45 is the third one-way valve, 46 is the second on-site pressure gauge, and 47 is the second remote pressure gauge. DETAILED DESCRIPTION

[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0021] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0022] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The layout is described in detail, such as the positional relationships of front, back, top, bottom, left, and right are based on the Figure 1 The layout direction is determined by the

[0023] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0024] Example 1: As shown in the attached Figure 1As shown, the single-well metering device for thin oil and condensate oil includes a first metering container 1 and a second metering container 2. The upper inlet of the first metering container 1 is fixedly connected to a first oil pipeline 3, the lower outlet of the first metering container 1 is fixedly connected to a first liquid pipeline 4, the first oil pipeline 3 is fixedly connected to the first inlet of the second metering container 2, the second liquid pipeline 6 is fixedly connected between the lower outlet of the second metering container 2 and the first liquid pipeline 4, the first gas pipeline 7 is fixedly connected between the upper outlet of the second metering container 2 and the first liquid pipeline 4 between the second liquid pipeline 6 and the outlet of the first liquid pipeline 4, the second gas pipeline 17 is fixedly connected between the inlet of the first gas pipeline 7 and the outlet of the first gas pipeline 7, the bottom inlet of the first metering container 1 is fixedly connected to a first water injection pipeline 8, and the bottom inlet of the second metering container 2 is fixedly connected to a second water injection pipeline 9.

[0025] The device of the utility model is highly integrated in design, easy to transport, occupies a small area, and meets the needs of flexible operation. It uses the volumetric method to measure crude oil. The first metering container 1 and the second metering container 2 are reversed to perform measurement. During the measurement process, the volume flow rate is calculated according to the inner diameters of the first metering container 1 and the second metering container 2 and the height of the rising liquid level.

[0026] The above-mentioned single-well metering device for thin oil and condensate can be further optimized and / or improved according to actual needs:

[0027] Example 2: The difference between it and Example 1 is: Figure 1 As shown, the first metering container 1 and the second metering container 2 are respectively fixedly provided with a first liquid level gauge 10 and a second liquid level gauge 11, and the first gas phase pipeline 7 between the inlet of the second gas phase pipeline 17 and the outlet of the second gas phase pipeline 17 are fixedly provided with a first manual valve 33 and a first remote flow meter 34 in sequence according to the flow direction of the medium, and the second gas phase pipeline 17 is fixedly provided with a second manual valve 35 and a second remote flow meter 36 in sequence according to the flow direction of the medium.

[0028] As needed, the first remote flowmeter 34 on the first gas phase pipeline 7 is a small-range gas flowmeter, and the second remote flowmeter 36 on the second gas phase pipeline 17 is a large-range gas flowmeter. By switching gas flowmeters of different ranges, accurate measurement of gas flow can be achieved.

[0029] Example 3: The difference between it and Example 1 to Example 2 is that: Figure 1As shown, a first drainage line 12 is fixedly connected between the first liquid level gauge 10 and the first infusion line 4 between the first measuring container 1 and the second infusion line 6, a second drainage line 13 is fixedly connected between the second liquid level gauge 11 and the second infusion line 6, a first flushing line 14 is fixedly connected between the first water injection line 8 and the first drainage line 12, and a second flushing line 15 is fixedly connected between the second water injection line 9 and the second drainage line 13.

[0030] As needed, before starting metering, the required amount of clean water is injected into the first metering container 1 and the second metering container 2 through the first water injection line 8 and the second water injection line 9 respectively to prevent oil from entering the first liquid level gauge 10 and the second liquid level gauge 11.

[0031] Example 4: The difference between it and Example 1 to Example 3 is that: Figure 1 As shown, a bridge line 16 is fixedly connected to the first oil pipeline 3 between the inlet of the first oil pipeline 3 and the second oil pipeline 5 and to the first liquid pipeline 4 between the first gas phase pipeline 7 and the outlet of the first liquid pipeline 4 .

[0032] As needed, after the first oil pipeline 3 is connected to the device, when no metering is performed, the oil flows directly out of the skid through the bridge pipeline 16 .

[0033] Example 5: The difference between it and Example 1 to Example 4 is that: Figure 1 As shown, a third infusion line 18 is fixedly connected between the first infusion line 4 and the second infusion line 6 between the second infusion line 6 and the first gas phase line 7 , and a drainage pump 19 is fixedly installed on the third infusion line 18 .

[0034] If necessary, during the drainage process, if the drainage speed is too slow, the drainage pump 19 is started, and the liquid is pressurized by the drainage pump 19 and discharged out of the skid.

[0035] Example 6: The difference between it and Example 1 to Example 5 is that: Figure 1 As shown, the first outlet at the top of the first metering container 1 is fixedly connected to a vent line 20, and the second outlet at the top of the first metering container 1 and the second inlet at the top of the second metering container 2 are fixedly connected to a gas-phase communication line 21, wherein the first outlet at the top of the first metering container 1 is located above the upper inlet of the first metering container 1, and the second inlet at the top of the second metering container 2 is located above the first inlet at the top of the second metering container 2.

[0036] Example 7: The difference between it and Example 1 to Example 6 is that: Figure 1As shown, a third manual valve 22 and an instrument testing device 23 are fixedly installed on the first oil pipeline 3 between the bridge pipeline 16 and the second oil pipeline 5 in sequence according to the flow direction of the medium, a first automatic valve 24 is fixedly installed on the first oil pipeline 3 between the second oil pipeline 5 and the first metering container 1, and a safety vent valve 25 is fixedly installed on the vent pipeline 20.

[0037] If the field instrument is to be calibrated as needed, it is only necessary to install the calibrated instrument at the position of the instrument testing equipment 23 during the measurement process, so as to meet the requirements of on-site single well measurement and field instrument calibration.

[0038] Example 8: The difference between it and Example 1 to Example 7 is that: Figure 1 As shown, the second oil pipeline 5 is fixedly provided with a remote temperature gauge 26, a first on-site pressure gauge 27, a first remote pressure gauge 28, and a second automatic valve 29 in sequence according to the flow direction of the medium. The first liquid delivery line 4 between the first metering container 1 and the first liquid discharge line 12 is fixedly provided with a third automatic valve 30, the second liquid delivery line 6 is fixedly provided with a fourth automatic valve 31, the first gas phase line 7 between the second metering container 2 and the second gas phase line 17 is fixedly provided with a fifth automatic valve 32, the bridge line 16 is fixedly provided with a fourth manual valve 37, the first water injection line 8 is connected to the inlet of the first water injection line 8. A fifth manual valve 38 is fixedly provided on the first water injection pipeline 8 between the first flushing pipeline 14, a sixth manual valve 39 is fixedly provided on the first discharge pipeline 12 between the first flushing pipeline 14 and the first infusion pipeline 4, a seventh manual valve 40 is fixedly provided on the second water injection pipeline 9 between the inlet of the second water injection pipeline 9 and the second flushing pipeline 15, an eighth manual valve 41 is fixedly provided on the second discharge pipeline 13 between the second flushing pipeline 15 and the second infusion pipeline 6, and a ninth manual valve 42 is fixedly provided on the first infusion pipeline 4 between the first gas phase pipeline 7 and the bridge pipeline 16.

[0039] Example 9: The difference between it and Example 1 to Example 8 is that: Figure 1 As shown, a first one-way valve 43 is provided on the first infusion line 4 between the second infusion line 6 and the third infusion line 18, a second one-way valve 44 is provided on the first infusion line 4 between the third infusion line 18 and the first gas phase line 7, and a third one-way valve 45, a second on-site pressure gauge 46, and a second remote pressure gauge 47 are fixedly provided on the first gas phase line 7 between the second gas phase line 17 and the first infusion line 4 in sequence according to the flow direction of the medium.

[0040] Example 10: The difference between it and Example 1 to Example 9 is that: Figure 1As shown, it also includes a PLC controller, and the first liquid level gauge 10, the second liquid level gauge 11, the first automatic valve 24, the remote temperature gauge 26, the first remote pressure gauge 28, the second automatic valve 29, the third automatic valve 30, the fourth automatic valve 31, the fifth automatic valve 32, the first remote flow meter 34, the second remote flow meter 36, and the second remote pressure gauge 47 are all electrically connected to the PLC controller.

[0041] As needed, before starting metering, close the fourth manual valve 37, the sixth manual valve 39, and the eighth manual valve 41, and open in sequence the connecting valve of the first liquid level gauge 10, the connecting valve of the safety vent valve 25, the connecting valve of the second liquid level gauge 11, the fifth manual valve 38, the seventh manual valve 40, the connecting valve of the first on-site pressure gauge 27, the connecting valve of the first remote pressure gauge 28, the connecting valve of the second on-site pressure gauge 46, and the connecting valve of the second remote pressure gauge 47, and inject the required amount of clean water into the first metering container 1 and the second metering container 2, respectively.

[0042] After the water addition is completed, close the fifth manual valve 38 and the seventh manual valve 40, open the fifth automatic valve 32 and the first automatic valve 24 through the PLC controller, close the second automatic valve 29, the third automatic valve 30, and the fourth automatic valve 31, open the ninth manual valve 42 and the third manual valve 22, and wait for the liquid to stabilize before starting metering:

[0043] (1) Record the liquid level h1 of the first liquid level meter 10 and the total accumulated V of the first remote flow meter 34 Q1 , and record the time t1 (s). At this time, the gas-liquid mixture from the single well enters the first metering container 1 through the third manual valve 22, the test instrument or the straight pipe section, and the first automatic valve 24. The gas phase enters the second metering container 2 through the gas phase connecting pipeline 21, passes through the fifth automatic valve 32 and the first manual valve 33, is measured by the first remote flow meter 34, and is discharged to the outside of the skid through the third one-way valve 45 and the ninth manual valve 42.

[0044] (2) When the liquid level of the first liquid level gauge 10 is higher than the preset liquid level value, the second automatic valve 29 is opened, the first automatic valve 24 is closed, the liquid level height h2 of the first liquid level gauge 10 is recorded, and the liquid level height h3 of the second liquid level gauge 11 is recorded. The liquid level H1=h2-h1 is the liquid level value of the first measuring container 1. According to the formula V=πr 2 H, calculate the liquid volume V1;

[0045] (3) Open the third manual valve 30 and close the fifth automatic valve 32. At this time, the mixed liquid from the single well enters the second metering container 2 through the second automatic valve 29. The liquid in the first metering container 1 is discharged to the outside of the skid through the third automatic valve 30, the first one-way valve 43, the second one-way valve 44, and the ninth manual valve 42 by air pressure.

[0046] (4) When the liquid level of the first liquid level meter 10 is lower than the preset liquid level value, the fifth automatic valve 32 is opened and the third automatic valve 30 is closed. At this time, the gas continues to be measured through the first remote flow meter 34;

[0047] (5) When the liquid level of the second liquid level gauge 11 is higher than the preset value, the first automatic valve 24 is opened, the second automatic valve 29 is closed, and the liquid level height h4 of the second liquid level gauge 11 is recorded. Similarly, the amount of liquid V2 entering the second measuring container 2 is calculated. At this time, the total amount of liquid entering the skid is V1 + V2;

[0048] (6) Open the fourth automatic valve 31 and close the fifth automatic valve 32. At this time, the mixed liquid from the single well enters the first metering container 1 through the first automatic valve 24; the liquid in the second metering container 2 is discharged to the outside of the skid through the fourth automatic valve 31, the first one-way valve 43, the second one-way valve 44, and the ninth manual valve 42 by air pressure;

[0049] (7) When the liquid level of the second liquid level meter 11 is lower than the preset liquid level value, the fifth automatic valve 32 is opened and the fourth automatic valve 31 is closed. At this time, the gas continues to be measured through the first remote flow meter 34;

[0050] After repeated can emptying and measuring in steps (2-7), when the preset time is reached or the preset number of cans is reached, the measurement stops, and the measurement time t2 (s) is recorded, and the total accumulated V of the first remote flow meter 34 is recorded. Q2 The total amount of liquid flowing into the skid during this time is V=V1+V2+V3……+V n , total gas accumulation V Q = V Q2 - V Q1 , measuring time t = t2-t1, liquid flow = V / t * 86400, gas flow = V Q / t * 24;

[0051] (8) Open the liquid outlet control valve (the third automatic valve 30 or the fourth automatic valve 31) corresponding to the last metering container, close the fifth automatic valve 32, and discharge the liquid in the metering container to the outside of the skid.

[0052] The first gas phase pipeline 7 and the second gas phase pipeline 17 are respectively provided with a first remote flow meter 34 and a second remote flow meter 36 with different measuring ranges. According to actual needs, one flow meter or two flow meters can be selected and used to measure the gas.

[0053] As required, the pipelines and equipment of the single-well metering device for thin oil and condensate oil may be equipped with conventional valves, thermometers, and pressure gauges known in the art according to production needs. The PLC controller may be a s7-200smart controller produced by Siemens.

[0054] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0055] The use process of the embodiment of the utility model is as follows: First, open the fifth manual valve 38 and the seventh manual valve 40 in sequence, and inject the required amount of clean water into the first measuring container 1 and the second measuring container 2 respectively; then, repeatedly pour the first measuring container 1 and the second measuring container 2 between the first measuring container 1 and the second measuring container 2 to measure, and record the liquid level height values ​​of the first liquid level gauge 10 and the second liquid level gauge 11 and the cumulative amount of the first remote flow meter 34; finally, calculate the total cumulative amount of liquid V and the total cumulative amount of gas V Q .

Claims

1. A single well metering device for thin oil and condensate oil, characterized in that It includes a first metering container and a second metering container. The upper inlet of the first metering container is fixedly connected to the first oil pipeline, the lower outlet of the first metering container is fixedly connected to the first liquid pipeline, the first oil pipeline is fixedly connected to the first inlet of the second metering container, the second liquid pipeline is fixedly connected between the lower outlet of the second metering container and the first liquid pipeline, the first gas pipeline is fixedly connected between the upper outlet of the second metering container and the second liquid pipeline and the outlet of the first liquid pipeline, the first gas pipeline is fixedly connected between the first gas pipeline inlet and the first gas pipeline outlet, the first water injection pipeline is fixedly connected to the bottom inlet of the first metering container, and the second water injection pipeline is fixedly connected to the bottom inlet of the second metering container.

2. The single-well metering device for thin oil and condensate according to claim 1, characterized in that A first liquid level gauge and a second liquid level gauge are fixedly installed on the first metering container and the second metering container respectively; a first manual valve and a first remote flow meter are fixedly installed on the first gas pipeline between the second gas pipeline inlet and the second gas pipeline outlet in sequence according to the flow direction of the medium; and a second manual valve and a second remote flow meter are fixedly installed on the second gas pipeline in sequence according to the flow direction of the medium.

3. The single well metering device for thin oil and condensate according to claim 2, characterized in that A first drainage pipeline is fixedly connected between the first liquid level gauge and the first measuring container and the second liquid infusion line, a second drainage pipeline is fixedly connected between the second liquid level gauge and the second liquid infusion line, a first flushing pipeline is fixedly connected between the first water injection line and the first drainage pipeline, and a second flushing pipeline is fixedly connected between the second water injection line and the second drainage pipeline.

4. The single-well metering device for thin oil and condensate according to claim 1, 2 or 3, characterized in that A bridge pipeline is fixedly connected to the first oil pipeline between the first oil pipeline inlet and the second oil pipeline and the first liquid pipeline between the first gas phase pipeline and the first liquid pipeline outlet.

5. The single-well metering device for thin oil and condensate according to claim 4 is characterized in that A third infusion line is fixedly connected between the first infusion line and the second infusion line between the second infusion line and the first gas phase line, and a drainage pump is fixedly installed on the third infusion line.

6. The single-well metering device for thin oil and condensate according to claim 1, 2, 3 or 5, characterized in that The first outlet at the top of the first metering container is fixedly connected to a vent line, and the second outlet at the top of the first metering container and the second inlet at the top of the second metering container are fixedly connected to a gas phase communication line, wherein the first outlet at the top of the first metering container is located above the inlet at the top of the first metering container, and the second inlet at the top of the second metering container is located above the first inlet at the top of the second metering container.

7. The single-well metering device for thin oil and condensate according to claim 6, characterized in that A third manual valve and instrument testing equipment are fixedly installed on the first oil pipeline between the bridge line and the second oil pipeline in sequence according to the flow direction of the medium. A first automatic valve is fixedly installed on the first oil pipeline between the second oil pipeline and the first metering container, and a safety vent valve is fixedly installed on the vent pipeline.

8. The single-well metering device for thin oil and condensate according to claim 5 or 7, characterized in that A remote temperature gauge, a first on-site pressure gauge, a first remote pressure gauge and a second automatic valve are fixedly installed on the second oil pipeline in sequence according to the flow direction of the medium. A third automatic valve is fixedly installed on the first liquid infusion pipeline between the first metering container and the first liquid discharge pipeline. A fourth automatic valve is fixedly installed on the second liquid infusion pipeline. A fifth automatic valve is fixedly installed on the first gas phase pipeline between the second metering container and the second gas phase pipeline. A fourth manual valve is fixedly installed on the bridge pipe. A fifth manual valve is fixedly installed on the first water injection pipeline between the inlet of the first water injection pipeline and the first flushing pipeline. A sixth manual valve is fixedly installed on the first liquid discharge pipeline between the first flushing pipeline and the first liquid infusion pipeline. A seventh manual valve is fixedly installed on the second water injection pipeline between the inlet of the second water injection pipeline and the second flushing pipeline. An eighth manual valve is fixedly installed on the second liquid discharge pipeline between the second flushing pipeline and the second liquid infusion pipeline. A ninth manual valve is fixedly installed on the first liquid infusion pipeline between the first gas phase pipeline and the bridge pipe.

9. The single-well metering device for thin oil and condensate oil according to claim 8, characterized in that A first one-way valve is provided on the first infusion pipeline between the second infusion pipeline and the third infusion pipeline, a second one-way valve is provided on the first infusion pipeline between the third infusion pipeline and the first gas phase pipeline, and a third one-way valve, a second on-site pressure gauge, and a second remote pressure gauge are fixedly provided on the first gas phase pipeline between the second gas phase pipeline and the first infusion pipeline in sequence according to the flow direction of the medium.

10. The single-well metering device for thin oil and condensate oil according to claim 9, characterized in that It also includes a PLC controller, and the first liquid level gauge, the second liquid level gauge, the first automatic valve, the remote temperature gauge, the first remote pressure gauge, the second automatic valve, the third automatic valve, the fourth automatic valve, the fifth automatic valve, the first remote flow meter, the second remote flow meter, and the second remote pressure gauge are all electrically connected to the PLC controller.

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