A two-phase flow meter and a detection method for simultaneously detecting gas-phase and liquid-phase

Abstract

The present application belongs to the technical field of flow meter, disclose a kind of two-phase flow meter and detection method for detecting gas phase, liquid phase simultaneously, two-phase flow meter includes main pipeline, detection mechanism, confluence mechanism, detection mechanism includes gas flow meter, liquid flow meter, first separation component and second separation component;Main pipeline is connected with the import of first separation component, second separation component is connected on one end of first separation component, gas flow meter is connected on the other end pipeline of first separation component, one end of second separation component is connected with liquid flow meter pipeline, the other end of second separation component is connected with gas flow meter pipeline, confluence mechanism is connected with the one end of gas flow meter away from first separation component and the one end of liquid flow meter away from second separation component.The present application improves the flow detection precision of gas-liquid mixed fluid, and then improves the quality of gas-liquid mixed fluid for production.

Description

Technical Field

[0001] This invention relates to the technical field of flow meters, specifically a two-phase flow meter and its detection method that simultaneously detects both gas and liquid phases. Background Technology

[0002] In industrial settings, instruments used to measure fluid flow are collectively referred to as flow meters or flow meters. They are among the most important instruments in industrial measurement. With industrial development, the requirements for the accuracy and range of flow measurement are becoming increasingly stringent. To adapt to various applications, different types of flow meters have emerged and are widely used in industries such as oil and gas and petrochemicals.

[0003] Currently, commonly used flow meters include differential pressure flow meters, electromagnetic flow meters, and ultrasonic flow meters, which can detect liquid and gaseous fluids and have a wide range of metering methods for single media. However, in natural gas production and development operations, the fluid is usually a mixture of gas and liquid phases. Affected by multiple flows, the existing flow meters have low metering accuracy for the two media, resulting in large deviations in the metering results. Moreover, most flow meters are expensive.

[0004] Therefore, there is an urgent need for a two-phase flow meter and its detection method that can detect gas-liquid mixtures, to detect the flow rate of gas-liquid mixed media, and to improve the accuracy of flow rate detection for gas-liquid mixed fluids.

[0005] CN210243059U describes a dual differential pressure gas-liquid two-phase flow measurement device based on an eccentric orifice plate. It includes an eccentric orifice plate, a pressure transmitter, a measuring pipe, a first differential pressure transmitter, and a second differential pressure transmitter. A temperature transmitter is installed on one side of the upper end of the measuring pipe. A first pressure tap is located upstream of the eccentric orifice plate, and a second and third pressure tap are sequentially located downstream. Several sets of pressure taps are formed on both the upstream and downstream pipes, connected to a pressure tapping ring chamber structure on the outer periphery. A pressure inlet for connecting to an external pressure tapping pipe is located above the vertical axis of the pressure tapping ring chamber. By using the eccentric orifice plate for throttling, two different differential pressure values ​​can be effectively measured. The relevant flow parameters of the gas and liquid phases in the gas-liquid two-phase flow can be calculated using these two different differential pressure values. However, this technical solution lacks intuitive detection methods and struggles to simultaneously achieve high detection accuracy and high-quality fluid separation. Summary of the Invention

[0006] Currently, when detecting fluid flow, gas flow meters or liquid flow meters are usually used to detect liquid and gaseous fluids. However, in oilfield development operations, pipelines usually contain a mixture of gaseous and liquid phases. When transporting liquid and gaseous media in oilfield operations, it is usually necessary to set a certain gas-liquid ratio for transportation.

[0007] Therefore, in order to address the problem of large errors in metering the gas and water phases in conventional natural gas wells, there is an urgent need for a two-phase flow meter and its detection method that can simultaneously detect both the gas and liquid phases, thereby improving the accuracy of flow detection for gas-liquid mixed fluids.

[0008] In order to improve the accuracy of flow detection of gas-liquid mixtures, this invention provides a two-phase flow meter that simultaneously detects the gas and liquid phases and its detection method.

[0009] In a first aspect, the present invention provides a two-phase flow meter that simultaneously detects gas and liquid phases, comprising a main pipeline, a detection mechanism, and a merging mechanism. The detection mechanism includes a gas flow meter, a liquid flow meter, a first separation component, and a second separation component. The main pipeline is connected to the inlet of the first separation component, the second separation component is connected to one end of the first separation component, the gas flow meter is connected to the other end of the pipeline of the first separation component, one end of the second separation component is connected to the liquid flow meter pipeline, the other end of the second separation component is connected to the gas flow meter pipeline, and the merging mechanism is connected to the end of the gas flow meter away from the first separation component and the end of the liquid flow meter away from the second separation component.

[0010] In some embodiments, a drain pipe and a three-way pipe are connected between the first separation component and the second separation component. One end of the drain pipe is connected to the first separation component, and the other end of the drain pipe is connected to one end of the three-way pipe. The other end of the three-way pipe is connected to the second separation component. A second ball valve is provided on the drain pipe.

[0011] In some embodiments, a discharge pipe is connected between the liquid flow meter and the second separation component, one end of the discharge pipe is connected to the second separation component, the other end of the discharge pipe is connected to the liquid flow meter, and a third ball valve is provided on the discharge pipe.

[0012] In some embodiments, the merging mechanism includes a merging pipe and a merging branch pipe, one end of the merging pipe being connected to the gas flow meter, one end of the merging branch pipe being connected to the liquid flow meter, and the other end of the merging branch pipe being connected to the merging pipe.

[0013] In some embodiments, both the first separation component and the second separation component include a separation housing, a separation plate, a plurality of first buffer plates and a plurality of second buffer plates. The separation housing has a fluid inlet, a first outlet and a second outlet. The separation plate is disposed in the separation housing and is inclinedly disposed in front of the fluid inlet. The first buffer plate and the second buffer plate are both inclinedly disposed in the separation housing and are both located below the separation plate.

[0014] Furthermore, there are one or more first buffer plates and second buffer plates.

[0015] In some embodiments, both the first buffer plate and the second buffer plate have drainage holes at the ends where they are connected to the separation housing.

[0016] In some embodiments, an exhaust pipe is connected between the gas flow meter and the separation housing. One end of the exhaust pipe is connected to the separation housing through a first outlet, and the other end of the exhaust pipe is connected to the gas flow meter. A first ball valve is provided on the exhaust pipe.

[0017] Secondly, a method for simultaneously detecting gas and liquid flow rates is provided. A gas-liquid mixture is introduced into a first separation component through a main pipeline. In the first separation component, the gas-liquid mixture is separated, so that the gas flows to a gas flow meter, while the liquid and gas mixed in the liquid flow to a second separation component. In the second separation component, the liquid flows to a liquid flow meter, and the gas mixed in the liquid flows to a gas flow meter. Under the detection of the gas and liquid flow meters, the gas flow rate and liquid flow rate are obtained. Finally, the gas-liquid mixture is discharged from the merging mechanism according to a set flow ratio under the control of the gas and liquid flow meters.

[0018] The specific testing method includes the following steps:

[0019] S1: The gas-liquid mixture is introduced into the first separation component from the main pipeline;

[0020] S2: The gas-liquid mixture is separated in the first separation component, so that the gas fluid flows to the gas flow meter, and the liquid fluid and the gas mixed in the liquid fluid flow to the second separation component.

[0021] S3: The liquid fluid and the gas flow mixed in the liquid fluid are separated in the second separation component. The liquid fluid flows to the liquid flow meter, and the gas flow mixed in the liquid fluid flows to the gas flow meter.

[0022] S4: The gas flow meter detects the flow rate of the gas fluid separated by the first separation component and the second separation component, and the liquid flow meter detects the flow rate of the liquid fluid separated by the second separation component;

[0023] S5: After the gas and liquid fluids are separated, they are merged and discharged through the merging pipe.

[0024] Compared with the prior art, the present invention has at least the following technical effects:

[0025] When using a gas-liquid mixture, the gas and liquid fluids are first separated. After the gas and liquid fluids are separated, the flow rates of the gas and liquid fluids are detected separately, thereby enabling the detection of the flow rate of the gas-liquid mixture and improving the accuracy of the flow rate detection.

[0026] By adjusting the gas flow meter and liquid flow meter respectively, the gas and liquid fluids are discharged through the merging mechanism in a set ratio, thereby improving the quality of the gas-liquid mixture used in production. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a two-phase flow meter.

[0029] Figure 2 This is a schematic diagram of the structure of the first separation component and the second separation component.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Main pipe; 21. Gas flow meter; 22. Liquid flow meter; 23. First separation assembly; 24. Second separation assembly; 3. Exhaust pipe; 31. First ball valve; 41. Drain pipe; 42. T-joint pipe; 43. Second ball valve; 51. Discharge pipe; 52. Third ball valve; 61. Combination pipe; 62. Combination branch pipe; 231. Separation housing; 232. Separation plate; 233. First buffer plate; 234. Second buffer plate; 235. Fluid inlet; 236. First outlet; 237. Second outlet; 238. Drain hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] This embodiment of the two-phase flow meter includes a main pipe 1, a detection mechanism, and a merging mechanism. The detection mechanism includes a gas flow meter 21, a liquid flow meter 22, a first separation component 23, and a second separation component 24. The main pipe 1 is connected to the inlet of the first separation component 23. The second separation component 24 is connected to one end of the first separation component. The gas flow meter 21 is connected to the other end of the pipe of the first separation component. One end of the second separation component 24 is connected to the pipe of the liquid flow meter 22, and the other end of the second separation component 24 is connected to the pipe of the gas flow meter 21. The merging mechanism is connected to the end of the gas flow meter 21 away from the first separation component 23 and the end of the liquid flow meter 22 away from the second separation component 24.

[0035] When detecting the flow rate of the gas-liquid mixture, the gas-liquid mixture is added to the first separation component 23 through the main pipe 1. In the first separation component 23, the gas-liquid mixture is separated, so that the gas fluid flows to the gas flow meter 21, and the liquid fluid and the gas mixed in the liquid fluid flow to the second separation component 24. In the second separation component 24, the liquid fluid flows to the liquid flow meter 22, and the gas fluid mixed in the liquid fluid flows to the gas flow meter 21. Under the detection of the gas flow meter 21 and the liquid flow meter 22, the gas flow rate and the liquid flow rate are obtained. Finally, the liquid fluid passing through the liquid flow meter 22 and the gas fluid passing through the gas flow meter 21 enter the merging mechanism. That is, the gas-liquid mixture is discharged from the merging mechanism according to the set flow ratio under the control of the gas flow meter 21 and the liquid flow meter 22.

[0036] A drain pipe 41 and a three-way pipe 42 are connected between the first separation component 23 and the second separation component 24. One end of the drain pipe 41 is connected to the first separation component 23, and the other end of the drain pipe 41 is connected to one end of the three-way pipe 42. The other end of the three-way pipe 42 is connected to the second separation component 24. A second ball valve 43 is provided on the drain pipe 41.

[0037] A discharge pipe 51 is connected between the liquid flow meter 22 and the second separation component 24. One end of the discharge pipe 51 is connected to the second separation component 24, and the other end of the discharge pipe 51 is connected to the liquid flow meter 22. A third ball valve 52 is installed on the discharge pipe 51.

[0038] The merging mechanism includes a merging pipe 61 and a merging branch pipe 62. One end of the merging pipe 61 is connected to a gas flow meter 21, one end of the merging branch pipe 62 is connected to a liquid flow meter 22, and the other end of the merging branch pipe 62 is connected to the merging pipe 61.

[0039] Both the first separation assembly 23 and the second separation assembly 24 include a separation housing 231, a separation plate 232, two first buffer plates 23 and two second buffer plates 234. The separation housing 231 is provided with a fluid inlet 235, a first outlet 236 and a second outlet 237. The separation plate 232 is disposed in the separation housing 231 and is inclined in front of the fluid inlet 235. The first buffer plates 233 and the second buffer plates 234 are both inclined in the separation housing 231 and are located below the separation plate 232.

[0040] Both the first buffer plate 233 and the second buffer plate 234 have drainage holes 238 on the end where they are connected to the separation shell 231.

[0041] An exhaust pipe 3 is connected between the gas flow meter 21 and the separation housing 231. One end of the exhaust pipe 3 is connected to the separation housing 231 through the first outlet 236, and the other end of the exhaust pipe 3 is connected to the gas flow meter 21. A first ball valve 31 is installed on the exhaust pipe 3.

[0042] Example 2

[0043] The detection method includes the following steps:

[0044] S1: The gas-liquid mixture is introduced into the first separation component 23 from the main pipe 1;

[0045] S2: The gas-liquid mixture is separated in the first separation component 23, so that the gas fluid flows to the gas flow meter 21, and the liquid fluid and the gas mixed in the liquid fluid flow to the second separation component 24.

[0046] S3: The liquid fluid and the gas flow mixed in the liquid fluid are separated in the second separation component 24. The liquid fluid flows to the liquid flow meter 22, and the gas flow mixed in the liquid fluid flows to the gas flow meter 21.

[0047] S4: Gas flow meter 21 detects the flow rate of the gas fluid separated by the first separation component 23 and the second separation component 24, and liquid flow meter 22 detects the flow rate of the liquid fluid separated by the second separation component 24;

[0048] S5: After the gaseous fluid and liquid fluid are separated, they are merged and discharged through the merging pipe 61.

[0049] The terms "comprising," "including," or any other variations thereof used in this specification are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. It should be noted that, without conflict, embodiments and features in the embodiments of this invention can be combined with each other. This invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the invention can be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A two-phase flow meter that simultaneously detects gas and liquid phases, characterized in that, It includes a main pipeline (1), a detection mechanism, and a merging mechanism. The detection mechanism includes a gas flow meter (21), a liquid flow meter (22), a first separation component (23), and a second separation component (24). The main pipeline (1) is connected to the inlet of the first separation component (23). The second separation component (24) is connected to one end of the first separation component. The gas flow meter (21) is connected to the other end of the pipeline of the first separation component. One end of the second separation component (24) is connected to the pipeline of the liquid flow meter (22). The other end of the second separation component (24) is connected to the pipeline of the gas flow meter (21). The merging mechanism is connected to the end of the gas flow meter (21) away from the first separation component (23) and the end of the liquid flow meter (22) away from the second separation component (24).

2. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 1, characterized in that, A drain pipe (41) and a three-way pipe (42) are connected between the first separation component (23) and the second separation component (24). One end of the drain pipe (41) is connected to the first separation component (23), and the other end of the drain pipe (41) is connected to one end of the three-way pipe (42). The other end of the three-way pipe (42) is connected to the second separation component (24). A second ball valve (43) is provided on the drain pipe (41).

3. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 1, characterized in that, A discharge pipe (51) is connected between the liquid flow meter (22) and the second separation component (24). One end of the discharge pipe (51) is connected to the second separation component (24), and the other end of the discharge pipe (51) is connected to the liquid flow meter (22). A third ball valve (52) is provided on the discharge pipe (51).

4. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 1, characterized in that, The merging mechanism includes a merging pipe (61) and a merging branch pipe (62). One end of the merging pipe (61) is connected to the gas flow meter (21), one end of the merging branch pipe (62) is connected to the liquid flow meter (22), and the other end of the merging branch pipe (62) is connected to the merging pipe (61).

5. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 1, characterized in that, The first separation component (23) and the second separation component (24) each include a separation shell (231), a separation plate (232), a first buffer plate (23), and a plurality of second buffer plates (234). The separation shell (231) is provided with a fluid inlet (235), a first outlet (236), and a second outlet (237). The separation plate (232) is disposed in the separation shell (231) and is inclinedly disposed in front of the fluid inlet (235). The first buffer plate (233) and the second buffer plate (234) are both inclinedly disposed in the separation shell (231) and are both located below the separation plate (232).

6. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 5, characterized in that, The number of the first buffer plate (23) and the second buffer plate (234) is one or more.

7. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 5, characterized in that, Both the first buffer plate (233) and the second buffer plate (234) are provided with drainage holes (238) at the end where they are connected to the separation shell (231).

8. The two-phase flow meter for simultaneously detecting gas and liquid phases according to claim 1, characterized in that, An exhaust pipe (3) is connected between the gas flow meter (21) and the separation housing (231). One end of the exhaust pipe (3) is connected to the separation housing (231) through the first outlet (236), and the other end of the exhaust pipe (3) is connected to the gas flow meter (21). A first ball valve (31) is provided on the exhaust pipe (3).

9. A method for simultaneously detecting gas phase and liquid phase flow rates, characterized in that, The gas-liquid mixture is added to the first separation component (23) through the main pipe (1). In the first separation component (23), the gas-liquid mixture is separated, so that the gas flows to the gas flow meter (21), and the liquid and the gas mixed in the liquid flow to the second separation component (24). In the second separation component (24), the liquid flows to the liquid flow meter (22), and the gas mixed in the liquid flows to the gas flow meter (21). Under the detection of the gas flow meter (21) and the liquid flow meter (22), the gas flow rate and the liquid flow rate are obtained. Under the control of the gas flow meter (21) and the liquid flow meter (22), the gas-liquid mixture is discharged from the confluence mechanism according to the set flow ratio.

10. The method for simultaneously detecting gas and liquid phase flow rates according to claim 9, characterized in that, The specific testing method includes the following steps: S1: The gas-liquid mixture is introduced from the main pipe (1) into the first separation component (23); S2: The gas-liquid mixture is separated in the first separation component (23), so that the gas fluid flows to the gas flow meter (21), and the liquid fluid and the gas mixed in the liquid fluid flow to the second separation component (24). S3: The liquid fluid and the gas flow mixed in the liquid fluid are separated in the second separation component (24), the liquid fluid flows to the liquid flow meter (22), and the gas flow mixed in the liquid fluid flows to the gas flow meter (21); S4: Gas flow meter (21) detects the flow rate of gas fluid separated by the first separation component (23) and the second separation component (24), and liquid flow meter (22) detects the flow rate of liquid fluid separated by the second separation component (24); S5: After the gas and liquid fluids are separated, they are merged and discharged through the merging pipe (61).

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