Quantum dot tracer sampling device

Abstract

The utility model relates to a quantum dot tracer sampling device which comprises a main pipeline and a bypass pipeline, the bypass pipelines are respectively a pipeline A, a pipeline B and a pipeline C, and the three bypass pipelines are respectively communicated with the main pipeline; a valve A is arranged on the pipeline A, only gas can pass through the valve A, a sampling filter disc is further arranged on the pipeline A, and the pipeline A is communicated with a pipeline C; the pipeline B is controlled by a valve B, the pipeline B is communicated with a gas-liquid separation tank, and the gas-liquid separation tank is communicated with a pipeline C; gas with quantum dots flows into the pipeline A from the main pipeline through the valve A and is captured by the sampling filter disc; the valve B is opened, the gas-liquid mixed fluid in the main pipeline flows into the gas-liquid separation tank through the pipeline B to be separated, the upper-layer gas in the tank enters the pipeline C, and the liquid is left in the tank, so that the gas-phase quantum dot sampling and the liquid-phase quantum dot sampling are mutually independent and do not interfere with each other. The utility model has the beneficial effects that the filter disc is prevented from being damaged or the safety risk is avoided, the disassembly and assembly are convenient, and the sampling is accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas well sampling detection technical field especially a quantum dot tracer sampling device. BACKGROUND

[0002] When developing oil and gas fields, tracers can identify production horizons, determine the liquid production of each layer, monitor the dynamic changes of produced liquid, and diagnose oil well problems to help efficient development of oil reservoirs, but the chemical tracers or radioactive tracers commonly used at present have certain shortcomings: the detection sensitivity of some chemical tracers is not enough, which cannot meet the demand of high-precision monitoring; radioactive tracers have radioactive hazards, which increase the application cost and operation difficulty, and their radioactive half-life is limited, which cannot support long-term monitoring if too short, and increases the risk of radioactive residue if too long; therefore, a new type of quantum dot tracer is currently used for sampling detection, and the quantum dot is also called semiconductor nanocrystal; the quantum dot is non-toxic and non-radioactive, each quantum dot exists independently, can be accurately detected, different quantum dots do not interfere with each other, are stable in release, have strong physical and chemical resistance, and can exist in harsh environments.

[0003] At present, quantum dot tracers are first prepared, and then the quantum dot tracers and conventional proppants are injected into the fracturing section of the oil and gas well during fracturing construction, and with the quantum dots fully mixed with the fluid produced by each layer section, they are transported to the wellhead together, and then the sample is collected and sent to the laboratory for analysis and determination; however, in actual tracer sampling, the quantum dot gas sample needs to be collected by a filter, and the liquid sample needs to be collected by a sample bottle, but when collecting oil and gas liquid, the filter is easily wetted by the liquid, deformed or even eroded when the gas containing liquid is directly introduced to collect the gas sample, and the liquid sample is collected from the pipeline sampling port, a large amount of gas is instantaneously sprayed, the liquid sample collection efficiency is low, a large amount of combustible gas is easily spilled, which can cause safety risks, the safety of the whole sampling process is relatively low, the sampling is not accurate, time-consuming and laborious, and the effect is poor.

[0004] Therefore, based on the deficiencies of the existing device according to customer feedback, the inventor has made further improvements to overcome the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the shortcomings of the prior art, and provides a quantum dot tracer sampling device which can avoid damaging the filter or causing safety risks, is convenient to disassemble and assemble, accurate in sampling, and high in working efficiency.

[0006] The utility model discloses a quantum dot tracer sampling device which can overcome the shortcomings of the prior art and is convenient to disassemble and assemble, accurate in sampling, and high in working efficiency.

[0007] The bypass pipes are pipe A, pipe B and pipe C respectively, and the three bypass pipes are respectively connected with the main pipe; a valve A is arranged on the pipe A, the valve A can only allow gas to pass through, and a sampling part is further arranged on the pipe A, a sampling filter is arranged in the sampling part, and the pipe A is connected with the pipe C; one end of the pipe B is inserted into the main pipe and is controlled by a valve B, and the other end of the pipe B is connected with a gas-liquid separation tank, the gas-liquid separation tank is connected with the pipe C; and a gas outlet is arranged on the pipe C;

[0008] During work, the valve A is opened, the gas containing quantum dots flows into the pipe A from the main pipe through the valve A, and is captured by the sampling filter in the sampling part; the valve B is opened, the gas-liquid mixed fluid in the main pipe flows into the gas-liquid separation tank through the pipe B, and the gas in the tank flows into the pipe C, and the liquid remains in the tank, so that the gas-phase and liquid-phase quantum dot samples are independent of each other and do not interfere with each other.

[0009] As a preferred technical solution of the present application, a turbulent structure is arranged in the main pipe; the turbulent structure is installed on the left side of the bypass pipe, and rotation of the turbulent structure drives the fluid mixing and homogenization in the main pipe, so that the collected sample is more representative.

[0010] As a preferred technical solution of the present application, a baffle structure is arranged in the gas-liquid separation tank; the baffle structure includes a pipe opening and a flow guide plate; the flow guide plate is horizontally arranged in the gas-liquid separation tank, and the pipe opening is connected with the interface of the pipe B; after the gas-liquid mixed fluid enters the gas-liquid separation tank through the pipe B, the fluid flows to the flow guide plate through the pipe opening, and the flow guide plate is more conducive to separation of the liquid and the gas in the fluid.

[0011] As a preferred technical solution of the present application, a plurality of small holes are arranged on the flow guide plate, and the liquid flows downward through the small holes and is stored in the gas-liquid separation tank.

[0012] As a preferred technical solution of the present application, the sampling part includes a first pipe and a second pipe; the first pipe and the second pipe are connected in a flat joint manner, that is, the first pipe and the second pipe are connected by a nut screw fastening; the first pipe is connected with the pipe A through a nut A and penetrates the pipe A, the second pipe is connected with the pipe C through a nut B and penetrates the pipe C, a pressure ring is arranged at the position where the first pipe and the second pipe are connected, and a sampling filter is arranged in the pressure ring.

[0013] As a preferred technical solution of the present application, the bottom ends of the pipe A, the pipe B and the pipe C are inserted into the main pipe, and the bottom ends of the three bypass pipes have bevels;

[0014] The pipe A and the pipe B are respectively the pipe of the gas inlet and the gas-liquid mixed fluid inlet, and the bevels of the pipe A and the pipe B are opposite to the flow direction of the fluid, so as to facilitate introduction of the fluid; and the pipe C is the fluid outlet pipe, and the bevel of the pipe C is opposite to the flow direction of the fluid, so as to facilitate fluid outflow.

[0015] As a preferred technical scheme of the present application, a vent valve is arranged at the gas outlet of the pipeline C, and the vent valve is opened to perform pressure relief operation after the sample is taken.

[0016] As a preferred technical scheme of the present application, the pipeline A is further connected with a pressure gauge, and the pressure state in the device is judged by observing the pressure gauge, and if the pressure gauge shows zero, the device is in the sampling state, and if the pressure gauge shows a pressure value, the device is in the sampling operation.

[0017] The utility model has the following advantages:

[0018] (1) the gas phase and liquid phase fluid are collected and sampled simply and quickly;

[0019] At present, when collecting and sampling, gas and liquid are often mixed in the fluid, so that the gas phase quantum dot is collected by the sampling filter sheet, and the liquid is wetted, and even damaged, and when collecting the liquid phase quantum dot, improper operation can cause gas leakage, and even cause safety problems; therefore, the three bypass pipelines designed in the present application are separated and independent, and can collect the fluid in the main pipeline, can extract the gas phase and liquid phase fluid, and can be controlled by different valves, can be sampled alone or simultaneously, and can ensure the accuracy and reliability of gas sampling and liquid sampling;

[0020] (2) simple structure, convenient to disassemble and assemble, and high working efficiency;

[0021] The gas phase sampling part of the present application adopts the mode that the first pipe and the second pipe are connected in parallel, and is connected by a screw and a nut, so that the sampling part can be disassembled and assembled quickly, the components do not interfere with each other, and the labor and time cost are greatly saved; at the same time, the sampling filter sheet can be replaced at the pressure ring, a certain time is saved, and the sampling filter sheet can be taken out immediately after sampling the gas for measurement, which is very convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the first perspective view of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the first perspective view of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the first perspective view of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the first perspective view of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the first perspective view of the utility model;

[0027] Figure 6 It is the structure schematic diagram of the sectional view angle of the installation baffle structure in the gas-liquid separation tank of the utility model;

[0028] In the figure: 1-main pipeline, 2-pipeline A, 3-pipeline B, 4-pipeline C, 5-valve A, 6-valve B, 7-valve C, 8-valve D, 9-first pipe, 10-second pipe, 11-pressure ring, 12-gas-liquid separation tank, 13-turbulent structure, 14-baffle structure, 15-guide plate, 16-emptying valve, 17-pressure gauge, 18-nut A. 19-nut B. DETAILED DESCRIPTION

[0029] The utility model will be further described below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0030] It should be noted that the orientation or positional relationship indicated by "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship commonly used when the product is used, or is the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0031] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0032] Therefore, based on the above problems, referring to Figure 1 The utility model provides a kind of quantum dot tracer sampling device to solve problem.

[0033] It should be noted that when quantum dot tracer sampling detection is carried out on fluid in oil and gas well, first, nanoscale quantum dot coating film is formed on quartz sand or ceramic particles and the like proppant, to make quantum dot tracer, then the quantum dot tracer is added to the fracturing section of oil and gas well, the tracer is fully mixed with fluid in pipe, the fluid in the interior of main pipeline 1 in the present scheme is the fluid mixed with quantum dot tracer, and the sampling device in the present scheme samples and detects the fluid.

[0034] Referring to Figures 1-6 The utility model discloses a kind of quantum dot tracer sampling devices, including main pipeline 1, bypass pipeline and gas-liquid separation tank 12, sampling part;

[0035] Wherein, referring to Figure 1The gas-liquid mixed fluid carrying quantum dots flows in the main pipeline 1, and three bypass pipelines are inserted and fixed on the main pipeline 1, and the three bypass pipelines are respectively communicated with the main pipeline 1 (the fluid can flow from the main pipeline 1 into the bypass pipelines), and the bypass pipelines are respectively pipeline A2, pipeline B3 and pipeline C4; a valve is arranged at the position where each of the three bypass pipelines is connected with the main pipeline 1, so as to control whether the fluid in the main pipeline 1 flows into the bypass pipeline;

[0036] Referring to Figure 1 and Figure 3 , the valve A5 is arranged on the pipeline A2, the valve A5 is only used for the gas to pass through, and a sampling part is further arranged on the pipeline A2, a replaceable sampling filter is arranged in the sampling part, so that the gas entering the pipeline A2 can be sampled and detected, one end of the pipeline A2 is communicated with the main pipeline 1, and the other end is communicated with the pipeline C4;

[0037] Referring to Figure 1 and Figure 3 , the valve B6 is arranged on the pipeline B3, the valve B6 is used for the gas-liquid to pass through, one end of the pipeline B3 is communicated with the main pipeline 1, and the other end is connected with the gas-liquid separation tank 12, the gas-liquid separation tank 12 is further communicated with the pipeline C4, after the gas-liquid mixed fluid enters the gas-liquid separation tank 12 through the pipeline B3, the liquid is left in the tank, and the gas flows into the pipeline C4 through the gas opening on the top of the separation tank, so that the gas-liquid separation is realized;

[0038] Referring to Figure 1 , the valve C7 is arranged between the pipeline C4 and the main pipeline 1, the pipeline C4 is a three-way pipeline, which is communicated with the main pipeline 1, the pipeline A2 and the pipeline B3, and a gas outlet is further arranged on the pipeline C4;

[0039] When sampling and detection are performed, the valve A5 is opened, the gas carrying quantum dots flows from the main pipeline 1 into the pipeline A2 through the valve A5, and is captured through the sampling filter in the sampling part; the valve B6 is opened, the gas-liquid mixed fluid in the main pipeline 1 flows into the gas-liquid separation tank 12 through the pipeline B3 to realize separation, the gas in the upper layer of the tank enters the pipeline C4, and the liquid is left in the tank, so that the gas-phase and liquid-phase quantum dots sampling are respectively sampled and detected.

[0040] Currently, when tracer sampling is carried out, quantum dots are mixed with fluid produced in each layer section, are transported to the wellhead together, and then samples are collected and sent to the laboratory for analysis and determination; but in actual sampling, filter paper is used to collect quantum dot gas samples, and sample bottles are used to collect liquid samples; but when collecting oil, gas and liquid, due to the mixing of gas and liquid, the gas stream containing liquid is directly drawn out to take gas samples with filter paper, and the filter paper is easily wetted by liquid, and when liquid samples are taken from the sampling port of the pipeline, a large amount of gas is sprayed, resulting in low liquid sample collection efficiency, inaccurate sampling, and time-consuming and laborious; the present scheme designs a sampling device, which is provided with three separate bypass pipelines to sample the fluid in the main pipeline 1 respectively, and extracts gas phase and liquid phase fluid respectively, which can be controlled by different valves, and can be sampled separately or simultaneously, to ensure the accuracy and reliability of gas and liquid sample collection.

[0041] In the embodiment, referring to Figures 1-3 For the main pipeline 1, a turbulent structure 13 is arranged in the main pipeline 1, the turbulent structure 13 is installed inside the main pipeline 1, and the turbulent structure 13 is located on the left side of the three bypass pipelines; the fluid entering the main pipeline 1 is first rotated through the turbulent structure 13, so that the fluid is agitated before being sampled through the bypass pipeline; the turbulent structure 13 can drive the fluid in the main pipeline 1 to mix, realize homogenization, effectively ensure the fluid disturbance degree, promote the full mixing of gas-liquid two phases, reduce the sample residence time, and increase the sampling accuracy and reliability.

[0042] In the embodiment, referring to Figures 1-3 and Figure 6 For the gas-liquid separation tank 12, the gas-liquid separation tank 12 is in the shape of a cylindrical tank, and the position where the gas-liquid separation tank 12 communicates with the pipeline B3 is located at the lower part of the gas-liquid separation tank 12; when the gas-liquid mixed fluid in the main pipeline 1 enters the gas-liquid separation tank 12 through the pipeline B3, due to the difference in density between the gas and the liquid, the liquid remains in the tank and the gas moves upward to flow into the pipeline C4 through the gas opening on the upper side of the gas-liquid separation tank 12, thereby realizing gas-liquid separation in the tank; meanwhile, a baffle structure 14 is arranged in the gas-liquid separation tank 12, the baffle structure 14 includes a pipe opening and a flow guide plate 15, the pipe opening communicates with the interface of the pipeline B3, the gas-liquid mixed fluid flows to the flow guide plate 15 through the pipe opening, the flow guide plate 15 is a stepped plate structure, has a downward stepped platform from the left end pipe opening to the right, and a plurality of small holes are formed in the flow guide plate 15, so that the fluid passes through the flow guide plate 15 to separate the liquid and the gas in it, the liquid flows downward along the small holes of the flow guide plate 15 and is stored in the gas-liquid separation tank 12, and the flow guide plate 15 makes the gas phase and the liquid phase separate better.

[0043] In the embodiment, referring to Figure 1 and Figures 4-5For the sampling part, the sampling part comprises a first pipe 9 and a second pipe 10; the first pipe 9 and the second pipe 1025 are connected in a flat joint manner, i.e. in a nut screw fastening connection; the first pipe 9 is connected with the pipe A2 through a nut A18 and penetrates through, the second pipe 10 is connected with the pipe C4 through a nut B19 and penetrates through, a pressure bearing ring 11 is installed at the position where the first pipe 9 and the second pipe 10 communicate, and a sampling filter is installed in the pressure bearing ring 11; after the valve A5 is opened, the gas with quantum dots flows into the pipe A2 from the main pipe 1 through the valve A5, and the gas with quantum dots is captured and enriched on the sampling filter in the sampling part; when the gas phase fluid flows through the sampling part, part of the quantum dots are filtered and retained on the filter, and the gas can smoothly flow out of the filter and then is discharged through the pipe C4.

[0044] Further, in the present scheme, a pressure gauge 17 is further arranged on the pipe A2, which is used for observing the pressure state in the device, and whether the device is depressurized is determined by observing the pressure gauge 17.

[0045] It should be noted that the gas phase sampling part of the present scheme adopts the flat joint manner of the first pipe 9 and the second pipe 10, which is connected through a screw nut, so that the sampling part can be easily disassembled and installed, and the sampling filter can also be easily replaced, which saves time and enables the sampling filter to be taken down immediately after sampling the gas for measurement, which is very convenient.

[0046] In the present embodiment, referring to Figure 1 and Figure 3 For the bypass pipe, the pipe A2, the pipe B3 and the pipe C4 inserted into the bottom end pipe opening of the main pipe 1 all have bevels, the pipe A2 and the pipe B3 are respectively used as the gas inlet pipe and the gas-liquid mixed fluid inlet pipe, the bevels of the pipe A2 and the pipe B3 are opposite to the fluid flow direction, so that the fluid can be easily introduced; the bevel of the pipe C4 is opposite to the fluid flow direction, so that the fluid can be easily discharged; since the pipe is designed as a U-shaped bottom seal, in order to avoid blockage, the bottom is cut as a bevel, preferably, the included angle between the bevel and the bottom is greater than the radius of the dependent pipe, so that even if part of the fluid flows along the pipe wall, it can also flow into the main pipe 1 in time.

[0047] Further, in the present scheme, a pressure gauge 17 is further arranged on the pipe A2, which is used for observing the pressure state in the device, and whether the device is depressurized is determined by observing the pressure gauge 17.

[0048] It should be noted that the gas liquid separation tank 12 is provided with a valve D8, and after the valve D8 is opened, the liquid phase sample in the gas liquid separation tank 12 is taken by a sample bottle; in order to prevent blockage, the liquid at the bottom of the gas liquid separation tank 12 needs to be periodically emptied.

[0049] Further, a silica gel gasket can be arranged at the sampling position on the pipe A2 to prevent leakage.

[0050] Therefore, the device can extract the gas phase sample in time and effectively without affecting or changing the basic conditions such as pressure and temperature in the system, and can also avoid pollution to the system during the process of obtaining the sample.

[0051] Workflow: First open valve A5, the gas with quantum dots flows into pipeline A2 from main pipeline 11 through valve A5, and is captured on the sampling filter in the sampling part; open valve B6, the gas-liquid mixed fluid in main pipeline 1 flows into gas-liquid separation tank 12 through valve B6; because the lower side of gas-liquid separation tank 12 is provided with an inlet and the upper side is provided with a gas opening, therefore, due to the different densities of gas and liquid, the gas is finally discharged from the gas outlet of gas-liquid separation tank 12 to pipeline C4; and the liquid is left in gas-liquid separation tank 12, and after being stable for a period of time, valve D8 is opened, and the quantum dot liquid sample in gas-liquid separation tank 12 is poured out and captured.

[0052] In the fracturing operation of an oil and gas well, quantum dot tracers are injected into the fracturing section thereof, the quantum dots are mixed with the fluid of each section, and the mixed sample is collected for analysis and detection, but when sampling, the fluid in the pipe is a gas-liquid mixture, and it is not convenient to sample the quantum dots of the gas phase fluid and the liquid phase fluid, the gas sample is taken by a filter, the filter is soaked by the liquid, resulting in damage, and when the liquid sample is taken, a large amount of gas is instantaneously sprayed due to the accompanying gas, resulting in low liquid sample collection efficiency and safety risks, and the sampling is not accurate and the effect is poor; meanwhile, the existing sampling component structure is relatively complex and cumbersome, and the installation and disassembly of the whole device are relatively troublesome, thereby reducing the sampling efficiency; the present scheme designs a sampling device, independently sets gas phase and liquid phase sampling components, and accurately controls them by a special valve, thereby avoiding the condition that the filter is soaked by the liquid when the gas sample is taken in the traditional sampling mode, resulting in poor sampling effect, and the sampling is more accurate; meanwhile, the device is convenient to disassemble and install, the sampling part of the device is connected by screws and nuts, the filter is convenient to disassemble and install or take, and the working efficiency is improved; a turbulent structure 13 is further arranged to stir the mixed fluid, the accuracy of sampling is improved, the separation of the gas-liquid mixed fluid is accelerated by a partition structure 14, and the overall working efficiency is improved.

[0053] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A quantum dot tracer sampling device, characterized by: It comprises a main pipeline (1), bypass pipelines and a gas-liquid separation tank (12); The bypass pipelines are pipeline A (2), pipeline B (3) and pipeline C (4) respectively, and the three bypass pipelines are respectively connected with the main pipeline (1); a valve A (5) is arranged on the pipeline A (2), the valve A (5) can only allow gas to pass through, and a sampling part is further arranged on the pipeline A (2), a sampling filter is arranged in the sampling part, and the pipeline A (2) is communicated with the pipeline C (4); one end of the pipeline B (3) is inserted into the main pipeline (1) and is controlled by a valve B (6), the other end of the pipeline B (3) is communicated with the gas-liquid separation tank (12), the gas-liquid separation tank (12) is communicated with the pipeline C (4), and a gas outlet is formed in the pipeline C (4); During operation, the valve A (5) is opened, the gas containing quantum dots flows into the pipeline A (2) from the main pipeline (1) through the valve A (5), and is captured by the sampling filter in the sampling part; the valve B (6) is opened, the gas-liquid mixed fluid in the main pipeline (1) flows into the gas-liquid separation tank (12) through the pipeline B (3) to be separated, the gas in the upper layer of the tank enters the pipeline C (4), and the liquid remains in the tank, so that the gas-phase and liquid-phase quantum dot samples are independent of each other and do not interfere with each other.

2. A quantum dot tracer sampling device according to claim 1, wherein: A turbulent structure (13) is arranged in the main pipeline (1); the turbulent structure (13) is installed on the left side of the bypass pipeline, and rotation of the turbulent structure (13) drives the fluid mixing and homogenization in the main pipeline (1), so that the collected sample is more representative.

3. The quantum dot tracer sampling device of claim 1, wherein: A baffle structure (14) is arranged in the gas-liquid separation tank (12); the baffle structure (14) comprises a pipe opening and a flow guide plate (15); the flow guide plate (15) is horizontally arranged in the gas-liquid separation tank (12), and the pipe opening is communicated with the interface of the pipeline B (3); after the gas-liquid mixed fluid enters the gas-liquid separation tank (12) through the pipeline B (3), the fluid flows to the flow guide plate (15) through the pipe opening, and the flow guide plate (15) is more conducive to the separation of the liquid and the gas in the fluid.

4. A quantum dot tracer sampling device according to claim 3, wherein: A plurality of small holes are formed in the flow guide plate (15), and the liquid flows downward through the small holes and is stored in the gas-liquid separation tank (12).

5. The quantum dot tracer sampling device of claim 1, wherein: The sampling part comprises a first pipe (9) and a second pipe (10); the first pipe (9) and the second pipe (10) are connected in a flat joint manner, that is, they are connected by a nut screw; the first pipe (9) is connected with the pipeline A (2) through a nut A (18) and is communicated therewith, the second pipe (10) is connected with the pipeline C (4) through a nut B (19) and is communicated therewith, a pressure ring (11) is arranged at the position where the first pipe (9) and the second pipe (10) are communicated, and a sampling filter is arranged in the pressure ring (11).

6. A quantum dot tracer sampling device according to claim 5, wherein: The bottom ends of the pipeline A (2), the pipeline B (3) and the pipeline C (4) are inserted into the main pipeline (1), and the bottom ends of the three bypass pipelines have bevels; The pipeline A (2) and the pipeline B (3) are respectively used as the pipeline of the gas inlet and the gas-liquid mixed fluid inlet, and the bevels thereof are opposite to the flow direction of the fluid, so as to facilitate the introduction of the fluid; The pipeline C (4) is used as the fluid outlet pipeline, and the bevel thereof is opposite to the flow direction of the fluid, so as to facilitate the flow of the fluid.

7. A quantum dot tracer sampling device according to claim 6, wherein: The gas outlet of the pipeline C (4) is provided with a vent valve (16), which is opened to release pressure after sampling.

8. A quantum dot tracer sampling device according to claim 6, wherein: The pipeline A (2) is further connected with a pressure gauge (17), which is used to determine the pressure state in the device. When the pressure gauge (17) shows zero, the device is in the sampling state. If the pressure gauge (17) shows a pressure value, the device is in the sampling operation.

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