Mixed-phase flow online gas and liquid sampling device based on collision separation

Abstract

The utility model discloses a mixed-phase flow online gas and liquid sampling device based on collision separation, and relates to the technical field of mixed-phase medium separation sampling, the mixed-phase flow online gas and liquid sampling device comprises a sampler body, a separation structure and a main pipeline; a gas sampling opening and a liquid sampling opening are formed in the sampler body; the sampler body is connected to the main pipeline in parallel through the sampling inlet pipe and the sampling outlet pipe; the separation structure is mounted in the sampler body and is used for separating the mixed-phase medium entering the sampler body from the sampling inlet pipe. The device is provided with a separation structure, so that the separation frequency is increased, and separation is more thorough; gas and liquid are separated from the mixed-phase medium, so that the accuracy of a sampling result is ensured; and the sampling result obtained by increasing the sampling area is representative.

Description

Technical Field

[0001] The present application relates to the technical field of miscible medium separation and sampling, and in particular to an on-line gas and liquid sampling device for miscible flow based on collision separation. Background Art

[0002] In the process of oilfield production management, in order to monitor the dynamic change characteristics of oil wells, it is necessary to measure the parameters such as the flow rate of oil wells in real time through metering equipment such as multiphase metering skids. In order to verify the accuracy of the measurement of the metering equipment, it is necessary to sample and detect the miscible medium.

[0003] CN 201488890 U discloses an on-line real-time sampling device for multiphase flow liquids, which overcomes the disadvantages of large automatic samplers such as complex structure, high failure rate, and low sampling ratio, and realizes representative sampling of a simple sampler. However, this sampler realizes the separation of gas and liquid by rotating downward along the inner wall of the container by its own gravity and kinetic energy, and the separation effect is not ideal. The separated gas still carries some liquid medium, and the liquid medium may still be doped with gas medium, resulting in inaccurate detection results.

[0004] On this basis, CN 201554460 U discloses a special on-line sampler for multiphase flow gas in real time. This sampler adds a mist eliminator to filter liquid droplets larger than 2 microns in the gas to realize the separation of liquid medium in the gas. However, the separation method of the gas-liquid two-phase medium of this sampler is to form a swirl, and under the action of centrifugal force, the heavier liquid flows outward and downward, and the lighter gas flows to the center of the swirl to form a gas core and flow upward.

[0005] In summary, although this sampler can filter the upward flowing gas medium by adding a mist eliminator, there are still defects in the original separation method of the medium, such as incomplete separation. When there is a large amount of liquid medium in the gas, the filtration efficiency is low, and there is still a large amount of liquid medium in the filtered gas medium. And due to incomplete separation, the liquid medium still contains a certain amount of gas medium, resulting in inaccurate sampling and detection of the liquid medium. Moreover, the miscible medium of this sampler directly enters the sampler through a pipeline, which may have the defect of uneven sampling of the miscible medium, resulting in unrepresentative sampling results and unable to accurately verify the metering results. Summary of the Utility Model

[0006] The technical problem solved by the present utility model is that when measuring the parameters such as the flow rate of oil wells in real time through metering equipment such as multiphase metering skids, in order to ensure the accuracy of verifying the measurement of the metering equipment, this sampler is used to sample and detect and calibrate the miscible medium. When sampling, this sampler can effectively separate the gas and liquid of the miscible medium to ensure the accuracy of the sampling result. The present application provides an on-line sampler for miscible flow based on gas-liquid collision separation.

[0007] An on-line gas-liquid sampling device for miscible flow based on collision separation provided by this application adopts the following technical solutions:

[0008] An on-line gas-liquid sampling device for miscible flow based on collision separation includes a sampler body, a separation structure and a main pipeline; a gas sampling port and a liquid sampling port are provided on the sampler body; the sampler body is connected in parallel to the main pipeline through a sampling inlet pipe and a sampling outlet pipe; the separation structure is installed inside the sampler body and is used for separating the miscible medium entering the inside of the sampler body through the sampling inlet pipe.

[0009] By adopting the above technical solutions, the main pipeline is a flow measurement pipeline for the miscible medium. The miscible medium enters the separation structure inside the sampler body through the end of the sampling inlet pipeline, realizing the separation of the gas medium and the liquid medium, solving the defect of incomplete separation during the separation process, making the sampling detection of the miscible medium more uniform, and ensuring the accuracy of the sampling results.

[0010] Optionally, the separation structure includes nozzles, a first perforated plate, a second perforated plate and a porous arc panel. At least one of the nozzles is installed on the sampling inlet pipe located inside the sampler body, and the second perforated plate, the first perforated plate and the porous arc panel are arranged in sequence from bottom to top.

[0011] By adopting the above technical solutions, three nozzles are provided, which play the role of splitting the incoming miscible medium. The miscible medium is sprayed onto the first perforated plate through the first nozzle, and partial gas-liquid separation occurs on the first perforated plate. By the same principle, the miscible medium is sprayed onto the second perforated plate through the second nozzle for secondary separation. The miscible medium is sprayed onto the porous arc panel through nozzle 3. The porous arc panel is of an arc structure, which separates the miscible medium three times, improving the separation effect. At the same time, the arc structure can make the equipment more compact and smaller in volume.

[0012] Optionally, the separation structure includes a collision plate, a fiber filter bundle, a first perforated plate and a second perforated plate. The first perforated plate, the second perforated plate and the collision plate are arranged in sequence along the direction of miscible medium transmission, and the fiber filter bundles are respectively fixed on the first perforated plate and the second perforated plate.

[0013] By adopting the above technical solutions, the nozzles are arranged at the sampling inlet pipeline. After the miscible medium is ejected from the nozzles, it collides with the first perforated plate and the second perforated plate, and the miscible medium collides with the collision plate, realizing the final separation of the gas medium and the liquid medium. The perforated plates here can be combined with a fiber filter structure. When the miscible fluid flows through the filter structure, the liquid medium flows back to the inside of the sampler through the fiber conduit, and at the same time, the gas medium continuously escapes through the fiber bundle, realizing the separation of the gas medium and the liquid medium.

[0014] Optionally, the connection method of the nozzle is any one of welding, threaded connection, compression connection and union connection.

[0015] By adopting the above technical solution, various connection methods improve the applicability of the nozzle.

[0016] Optionally, an exhaust valve and a pressure gauge are further installed on the sampler body. The exhaust valve is communicated with the sampler body and is used for discharging the gas medium after detection. The pressure gauge is installed on the sampler body and is used for monitoring the internal pressure of the sampler.

[0017] By adopting the above technical solution, when the sampling is completed, the gas medium is discharged through the exhaust valve, and the pressure gauge is used to monitor the internal pressure of the sampler. When the pressure of the pressure gauge is 0, all the gas medium inside the sampler is discharged, reducing the situation that the internal residue affects the accuracy of the sampling data for the next detection.

[0018] Optionally, at least one layer of mist eliminator for filtering and separating the liquid droplets of the gas medium is arranged inside the sampler body.

[0019] By adopting the above technical solution, the liquid droplets in the gas medium are filtered out, and the sampled gas is purer, which helps to improve the accuracy during sampling.

[0020] Optionally, a ball valve I for controlling the gas-liquid flow is installed on the sampling inlet pipe, a ball valve III for controlling the gas-liquid flow is installed on the sampling outlet pipe, a ball valve II for controlling the gas flow is installed between the gas sampling port and the sampler body, and a ball valve IV for controlling the liquid flow is installed between the liquid sampling port and the sampler body.

[0021] By adopting the above technical solution, when the liquid enters the main pipeline from the gas-liquid inlet and on-line gas-liquid sampling is required, open the ball valve I and the ball valve III to make the mixed-phase medium flow into the sampler body for sampling. When gas sampling is required, open the ball valve II, remove the blind plate, and connect the sampler body for gas sampling; when liquid sampling is required, open the ball valve IV, remove the blind plate, and connect the sampler body for liquid sampling; when simultaneous gas and liquid sampling is required, open the ball valve II and the ball valve IV, remove the blind plates for blocking the ports respectively, and sample from the liquid sampling port and the gas sampling port of the sampler body respectively; after sampling, the closing sequence is the ball valve II, the ball valve IV, the ball valve I, the ball valve III. Open the exhaust port valve, and after the pressure is released, close the exhaust port valve.

[0022] Optionally, the second perforated plate is installed with its hole positions staggered from those of the first perforated plate, and the aperture of the first perforated plate is larger than that of the second perforated plate.

[0023] By adopting the above technical solution, the miscible medium collides with the first porous plate and the second porous plate after being ejected from the nozzle. The staggered hole positions enable more gas-liquid separation, improving the gas-liquid separation effect.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The miscible medium in the sampling pipeline enters the sampler through the nozzle, increasing the sampling area and making the sampling result more representative;

[0026] 2. The gas medium and the liquid medium are effectively separated through the separation structure inside the sampler. The separation structure combining the shunt nozzle and the multi-layer porous plate increases the separation times, making the separation more thorough; the separation structure of the porous plate and the fiber bundle increases the separation path, making the separation more thorough;

[0027] 3. The sampler is connected in parallel to the main measurement pipeline, enabling on-line sampling without affecting the metering of the main pipeline during the sampling process;

[0028] 4. This sampler can achieve sampling and detection of the miscible medium. During detection, it is not necessary to stop the metering process of the flowmeter, and sampling and detection can be carried out at any time on the measurement line. The sampler structure is compact, occupying less space than the traditional sampling tank. The gas-liquid separation is carried out through the porous plate, making the separation of the multi-phase mixed medium, the gas medium and the liquid medium more thorough, ensuring the accuracy of the sampling result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram showing Embodiment 1 of the present application.

[0031] Figure 2 It is a schematic structural diagram showing Embodiment 2 of the present application.

[0032] Figure 3 It is a schematic cross-sectional view of the orifice plate of the separation structure showing Embodiment 1 of the present application.

[0033] Figure 4 It is a schematic cross-sectional view of the orifice plate of the separation structure showing Embodiment 2 of the present application

[0034] Reference numerals: 1, main pipeline; 2, nozzle; 3, first perforated plate; 4, second perforated plate; 5, porous arc panel; 6, mist eliminator; 7, exhaust valve; 8, pressure gauge; 9, blind plate; 10, first ball valve; 11, second ball valve; 12, third ball valve; 14, fourth ball valve; 15, fiber filter bundle; 16, collision plate; 17, sampler body; 18, separation structure. Detailed implementation manners

[0035] The following further elaborates on this application Figures 1-4 in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] The embodiment of this application discloses an on-line gas and liquid sampling device for multiphase flow based on collision separation.

[0038] Referring to Figure 1 and Figure 3 as shown, it includes a sampler body 17, a separation structure 18 and a main pipeline 1; the main pipeline 1 is a flow measurement pipeline for multiphase medium, and the sampler body 17 is provided with a gas sampling port and a liquid sampling port; the sampler body 17 is connected in parallel to the main pipeline 1 through a sampling inlet pipe and a sampling outlet pipe; the sampler body 17 is connected in parallel to the main pipeline of metering devices such as a multiphase metering skid through a sampling inlet pipe and a sampling outlet pipe, and the sampling process does not affect the metering of the multiphase medium. The separation structure 18 is installed inside the sampler body 17 and is used to separate the multiphase medium entering the inside of the sampler body 17 from the sampling inlet pipe.

[0039] Referring to Figure 1 as shown, the separation structure 18 includes a nozzle 2, a first perforated plate 3, a second perforated plate 4 and a porous arc panel 5. At least one nozzle 2 is installed on the sampling inlet pipe located inside the sampler body 17. The second perforated plate 4, the first perforated plate 3 and the porous arc panel 5 are arranged in sequence from bottom to top. The porous arc panel 5 is an arc structure. The separation structure 18 is in the form of a combination of 3 groups of nozzles and perforated plates. The nozzle 1 sprays towards the position of the second perforated plate 4, the nozzle 2 sprays towards the position of the first perforated plate 3. The nozzle 1 and the first perforated plate 3 achieve the first separation, the nozzle 2 and the second perforated plate 4 achieve the second separation, the nozzle 3 and the porous arc panel 5 perform the third separation. The porous arc panel 5 is set as an arc, and the aperture of the first perforated plate 3 is larger than the aperture of the second perforated plate 4.

[0040] A ball valve is installed at the inlet pipeline of the sampling port. When sampling, the ball valve is placed in the open state to enable sampling. An air sampling port is provided at the upper part of the sampler body 17, and a liquid sampling port is provided at the lower part of the sampler body 17. A ball valve is provided at the air sampling port. Opening the ball valve can perform sampling of the gas medium. A ball valve is provided at the liquid sampling inlet. Opening the ball valve can perform sampling of the liquid medium. A blind plate 9 is provided at the air sampling port and the liquid sampling port to prevent leakage of the gas medium and the liquid medium. When sampling, the blind plate 9 needs to be removed. A ball valve is provided at the sampling outlet pipeline. When sampling is completed, the ball valve is opened, and the liquid medium re-enters the main measurement pipeline 1 through the sampling outlet pipeline.

[0041] See Figure 1 As shown, a ball valve one 10 for controlling the flow of gas and liquid is installed on the sampling inlet pipe, a ball valve three 12 for controlling the flow of gas and liquid is installed on the sampling outlet pipe, a ball valve two 11 for controlling the gas flow is installed between the air sampling port and the sampler body, and a ball valve four 14 for controlling the liquid flow is installed between the liquid sampling port and the sampler body. A ball valve is provided at the sampling inlet. When sampling, opening the ball valve at the sampling pipe inlet can start sampling; after sampling is completed, the separated liquid medium returns to the main pipeline 1 through the sampling outlet pipeline.

[0042] The sampling inlet pipeline introduces the multiphase medium into the sampler body 17. A nozzle 2 is provided at the inlet. The connection method of the nozzle is one of welding, threaded connection, compression connection, and union connection. In this embodiment, when the nozzle is connected by a union, the nozzle rotates when the multiphase medium enters the nozzle through the sampling inlet pipeline, which not only increases the collision area of the fluid on the perforated plate but also separates the gas-liquid medium once by rotation. The perforated plate can block the forward flow of the fluid, and the gas-liquid separation is achieved by expanding the contact area and colliding to block the flow.

[0043] See Figure 1 As shown, an exhaust valve 7 and a pressure gauge 8 are provided at the upper part of the sampler body 17. If gas sampling is required, open the ball valve one 10 on the gas sampling inlet pipe and the blind plate 9 at the gas sampling port. The separated gas medium can be sampled and detected through the gas sampling port; a liquid sampling port is provided below the sampler body 17. If liquid sampling is required, open the ball valve four 14 at the liquid sampling port and the blind plate 9 at the liquid sampling port. The separated liquid medium can be sampled and detected through the liquid sampling port; when sampling is completed, the gas medium is discharged through the exhaust valve 7, and the pressure gauge 8 is used to monitor the internal pressure of the sampler. When the pressure of the pressure gauge 8 is 0, all the gas medium inside the sampler is discharged.

[0044] At least one mist eliminator 6 is provided inside the sampler body 17 to filter the liquid droplets in the gas medium. The gas-liquid medium separated by this separation method is further filtered by the mist eliminator 6, making the sampled gas purer.

[0045] The implementation principle of an on-line gas-liquid sampling device for miscible flow based on collision separation in an embodiment of this application is as follows: At least three nozzles 2 can be set according to the size of the sampler to shunt the incoming miscible medium. The three-stage separation of the miscible medium is to improve the separation effect. The miscible medium is sprayed onto the first perforated plate 3 through the first nozzle, and part of the gas-liquid is separated once at the first perforated plate 3. Similarly, the miscible medium is sprayed onto the second perforated plate 4 through the second nozzle for secondary separation; the miscible medium is sprayed onto the porous arc panel 5 through the third nozzle. The porous arc panel 5 has an arc structure, which can effectively save the volume of the sampler body 17 and make the structure more compact.

[0046] Embodiment 2

[0047] See Figure 2 and Figure 4 As shown in

[0048] Compared with Embodiment 1, the difference lies in the different separation structure 18. The separation structure 18 includes a collision plate 16, a fiber filter bundle 15, a first perforated plate 3 and a second perforated plate 4. The first perforated plate 3, the second perforated plate 4 and the collision plate 16 are arranged in sequence along the direction of miscible medium transmission. The fiber filter bundles 15 are respectively fixed on the first perforated plate 3 and the second perforated plate 4. More than two perforated plates are provided inside the sampler body. After the miscible medium enters the sampler, it is sprayed onto the perforated plate through the nozzle to block the forward flow of the fluid. Through continuous collision and flow blocking of the perforated plate, the gas medium and the liquid medium can be fully separated; the first perforated plate 3 and the second perforated plate 4 are installed in a staggered manner to facilitate more gas-liquid separation.

[0049] When the liquid enters the main pipeline 1 from the gas-liquid inlet and on-line gas-liquid sampling is required, open the first ball valve 10 and the third ball valve 12 to allow the miscible medium to flow into the sampler body for sampling; when gas sampling is required, open the second ball valve 11, remove the blind plate 9, and connect the sampler body for gas sampling; when liquid sampling is required, open the fourth ball valve 14, remove the blind plate 9, and connect the sampler body for liquid sampling; when simultaneous gas and liquid sampling is required, open the second ball valve 11 and the fourth ball valve 14, remove the blind plates 9 used to block the ports respectively, and sample from the liquid sampling port and the gas sampling port of the sampler body 17 respectively; after sampling, the closing sequence is the second ball valve 11, the fourth ball valve 14, the first ball valve 10, and the third ball valve 12. Open the exhaust port valve. After the pressure is released, close the exhaust port valve;

[0049] When the fluid enters the rotating nozzle, the nozzle rotates, increasing the collision area of the fluid on the first perforated plate 3. Part of the fluid collides with the second perforated plate 4 through the small holes of the first perforated plate 3, causing the fluid to collide a second time, which further increases the separation of the gas-liquid components. The holes of the first perforated plate 3 and the second perforated plate 4 are staggered.

[0050] The separation structure 18 adopts the combination of a perforated plate and a collision plate 16. The nozzle is arranged at the sampling inlet pipeline. After the mixed-phase medium is ejected from the nozzle, it collides with the perforated plate 1 (three) and the perforated plate 2 (four). The perforated plate 2 (four) is installed with its hole positions staggered from those of the perforated plate 1 (three), and the aperture of the perforated plate 1 (three) is larger than that of the perforated plate 2 (four), so that more gas-liquid separation occurs. Finally, it collides with the collision plate 16 to achieve the last separation. The perforated plate here can be combined with a fiber filtration structure. When the mixed-phase fluid flows through the filtration structure, the liquid medium flows back into the sampler through the fiber conduit, and at the same time, the gas medium continuously escapes through the fiber bundle, realizing the separation of the gas medium and the liquid medium.

[0051] Working principle: When on-line sampling is carried out, the gas-liquid passes through the sampling inlet, and the fluid area is enlarged through the nozzle and sprayed onto the perforated plate 1 (three), blocking the forward flow of the fluid. By expanding the contact area and colliding and blocking the flow, the gas-liquid is separated; some gas-liquid contacts and collides with the perforated plate 2 (four) through the perforated plate 1 (three). The perforated plate 2 (four) is installed with its hole positions staggered from those of the perforated plate 1 (three), so that more gas-liquid separation occurs; the gas-liquid after two collisions is filtered through the mist eliminator 6, making the sampled gas purer, and the liquid sample is taken from the lower sampling port.

[0052] This sampler samples and detects the mixed-phase medium. During detection, it is not necessary to stop the metering process of the flowmeter, and sampling and detection can be carried out at any time on the measurement line, reducing the influence on the metering of the main pipeline 1 during the sampling process. The sampling machine has a compact structure and occupies less space than the traditional sampling tank. The gas-liquid separation is carried out through the perforated plate, making the separation of the gas medium and the liquid medium in the multiphase mixed medium more thorough, ensuring the accuracy of the sampling result; the mixed-phase medium in the sampling pipeline enters the sampler through the nozzle, increasing the sampling area, and the sampling result is more representative; the gas medium and the liquid medium are effectively separated through the separation structure 18 inside the sampler. The separation structure 18 combining the shunt nozzle and the multi-layer perforated plate increases the number of separation times, making the separation more thorough; the separation structure 18 of the perforated plate and the fiber bundle increases the separation path, making the separation more thorough.

[0053] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are merely used to distinguish different components. Similar terms such as "a" or "an" do not denote a quantity limitation either, but mean that there is at least one. Similar terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0054] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A mixed phase flow online gas and liquid sampling device based on collision separation, characterized in that: It comprises a sampler body (17), a separation structure (18) and a main pipeline (1); The sampler body (17) is provided with a gas sampling port and a liquid sampling port; The sampler body (17) is connected in parallel to the main pipeline (1) via a sampling inlet pipe and a sampling outlet pipe; The separation structure (18) is installed inside the sampler body (17) and is used to separate the mixed-phase medium entering the sampler body (17) through the sampling inlet pipe.

2. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 1 is characterized in that: The separation structure (18) comprises a nozzle (2), a porous plate 1 (3), a porous plate 2 (4) and a porous arc panel (5), at least one of the nozzles (2) being mounted on a sampling inlet pipe located inside the sampler body (17), and the porous plate 2 (4), the porous plate 1 (3) and the porous arc panel (5) being arranged in sequence from bottom to top.

3. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 1 is characterized in that: The separation structure (18) comprises a collision plate (16), a fiber filter bundle (15), a porous plate one (3) and a porous plate two (4); the porous plate one (3), the porous plate two (4) and the collision plate (16) are arranged in sequence along the direction of mixed-phase medium transmission; the fiber filter bundle (15) is fixed on the porous plate one (3) and the porous plate two (4), respectively.

4. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 2 is characterized in that: The connection mode of the nozzle (2) is any one of welding, threaded connection, compression connection and flexible joint connection.

5. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 1 is characterized in that: The sampler body (17) is also provided with an exhaust valve (7) and a pressure gauge (8). The exhaust valve (7) is used to control the flow of gaseous medium inside the sampler body (17). The pressure gauge (8) is used to monitor the internal pressure of the sampler and is installed on the sampler body (17).

6. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 1 is characterized in that: At least one layer of mist collector (6) for filtering and separating gas medium droplets is arranged inside the sampler body (17).

7. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 1 is characterized in that: A ball valve (10) for controlling the flow of gas and liquid is installed on the sampling inlet pipe, a ball valve (12) for controlling the flow of gas and liquid is installed on the sampling outlet pipe, a ball valve (11) for controlling the flow of gas is installed between the gas sampling port and the sampler body, and a ball valve (14) for controlling the flow of liquid is installed between the liquid sampling port and the sampler body.

8. The mixed phase flow online gas and liquid sampling device based on collision separation according to claim 3 is characterized by: The holes of the porous plate 2 and the porous plate 1 are installed at staggered positions, and the hole diameter of the porous plate 1 (3) is larger than the hole diameter of the porous plate 2 (4).

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