A gas mist mixer for natural gas wellhead

Abstract

The utility model provides an aerosol mixer for a natural gas wellhead, which relates to the technical field of gas-liquid mixing equipment and comprises a coaxially arranged inlet pipe, a venturi tube and an outlet pipe, wherein the inlet pipe is connected to the air inlet of the venturi tube, the outlet pipe is connected to the air outlet of the venturi tube, a swirler is arranged at the inlet pipe, a plurality of atomized liquid injection devices are arranged at the throat of the venturi tube, high-pressure gas is forced to generate a spiral through the swirler, the high-pressure spiral gas enters the venturi tube, a negative pressure is generated at the edge of the throat of the venturi tube, atomized liquid is sucked into the center of the high-pressure spiral gas for mixing, and the high-pressure spiral gas takes away the mixed atomized liquid when passing through the throat, and the purpose is to solve the problem of low inhibitory effect on the generation of water and hydrates in the well flow during the throttling transportation of the high-pressure natural gas inlet and outlet in the prior art due to insufficient mixing of gas and liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-liquid mixing equipment, in particular to an aerosol mixer for a natural gas wellhead. Background Art

[0002] With the development of urbanization in my country, more and more places are beginning to use natural gas as fuel. In the process of gas extraction from natural gas fields, the components of natural gas extracted are different due to the diversity of underground conditions. High-pressure natural gas often contains saturated water or free water or various heavy components. In the process of throttling and transportation at the inlet and outlet, water and hydrate precipitation often occur due to throttling of low-temperature well flow. These solids and liquids cause the entire pipeline to be blocked. One of the process methods is to inject ethylene glycol into the wellhead gas to reduce the formation temperature of hydrates and the dew point temperature of the gas. The liquid should be fully mixed with the gas to achieve the inhibitory effect.

[0003] For example, in the Chinese patent literature, the publication number is CN203408644U, the publication date is January 29, 2014, and the name is a utility model patent for a Venturi mixer, which includes a contraction section and a front throat pipe connected to the outlet of the contraction section, the front throat pipe is connected to the rear throat pipe, and the outlet of the rear throat pipe is connected to the expansion section; the front and rear throat pipes are correspondingly sleeved with the first and second annular liquid distribution pipes connected to the liquid inlet pipe device, the first annular liquid distribution pipe and the front throat pipe are connected through a plurality of first liquid distribution pipes arranged in a left-handed manner, and the second annular liquid distribution pipe and the rear throat pipe are connected through a plurality of second liquid distribution pipes arranged in a right-handed manner. Although the above-mentioned prior art can meet the mixing of gas and liquid, it is not sufficient for the mixing of high-pressure gas and liquid. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides an aerosol mixer for a natural gas wellhead, which aims to solve the problem of low inhibitory effect on the production of water and hydrates in the well flow during the throttling transportation of the high-pressure natural gas inlet and outlet due to insufficient mixing of the high-pressure gas and liquid in the prior art.

[0005] The utility model is realized by the following technical solutions:

[0006] An aerosol mixer for a natural gas wellhead is characterized in that it comprises a coaxially arranged inlet pipe, a venturi tube and an outlet pipe, wherein the inlet pipe is connected to the air inlet of the venturi tube, and the outlet pipe is connected to the air outlet of the venturi tube. A swirler is provided at the inlet pipe, and a plurality of atomized liquid injection devices are provided at the throat of the venturi tube. High-pressure gas is forced to generate a spiral through the swirler, and the high-pressure spiral gas enters the venturi tube. Negative pressure is generated at the edge of the throat of the venturi tube to suck the atomized liquid into the center of the high-pressure spiral gas for mixing. The high-pressure spiral gas takes away the mixed atomized liquid when passing through the throat.

[0007] Furthermore, the Venturi tube includes a contraction section, a throat section and an expansion section, the air outlet of the inlet pipe is connected to the contraction section, the contraction section is connected to the throat section, and the air outlet of the throat section is connected to the expansion section.

[0008] Furthermore, the throat section is extended upwardly to be provided with an injection pipe section, and three atomized liquid injection devices are evenly arranged in the circumferential direction of the injection pipe section for injecting atomized liquid into the throat section. On the one hand, this is to prevent a single atomized liquid injection device from introducing liquid at a single point and concentrating it only at a part of the throat section, resulting in insufficient mixing; on the other hand, by evenly introducing liquid into the throat section at three points, the liquid can be evenly dispersed on the throat section, and the high-pressure spiral gas can be mixed with more liquid.

[0009] Furthermore, the contraction section adopts a gradually contracting pipe, and the expansion section adopts a gradually expanding pipe.

[0010] Furthermore, the inner diameter of the end of the inlet pipe gradually decreases along the flow direction of the high-pressure spiral gas to match the inner diameter of the front end of the contraction section; the inner diameter of the front end of the outlet pipe gradually decreases against the flow direction of the high-pressure spiral gas to match the inner diameter of the end of the expansion section.

[0011] Furthermore, it also includes fasteners, which include connecting flanges and connecting rods with threads at both ends. The connecting flanges are respectively assembled at the connection between the inlet pipe and the contraction section and at the connection between the outlet pipe and the expansion section. The connecting rods pass through the connecting flanges and are fastened by nuts.

[0012] Furthermore, an O-ring is provided at the connection between the inlet pipe and the contraction section; and an O-ring is provided at the connection between the outlet pipe and the expansion section.

[0013] The working principle of the utility model is as follows:

[0014] High-pressure gas enters the Venturi tube through the inlet pipe, and the swirler installed at the inlet pipe forces the high-pressure gas to spiral. The high-pressure spiral gas enters the narrowest part of the Venturi tube. The speed of the high-pressure spiral gas increases due to the reduction of the flow cross-sectional area. The entire flow must undergo the pipeline contraction process at the same time, so the pressure also decreases at the same time, thereby generating a pressure difference, that is, the throat edge of the Venturi tube generates negative pressure to suck the atomized liquid into the center of the high-pressure spiral gas for mixing, and the high-pressure spiral gas takes away the mixed atomized liquid when passing through the throat.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. A swirler is provided at the inlet pipe. The high-pressure gas is forced to generate a spiral through the swirler, which can make the high-pressure gas flow up and down, which is conducive to disturbance and will make it mix more fully with the atomized liquid. When passing through the throat section, the flow rate of the high-pressure gas is accelerated. Under the Venturi tube effect, negative pressure is generated at the edge of the throat to suck the atomized liquid into the gas center for mixing. The high-pressure spiral gas takes away the mixed liquid when passing through the throat pipe.

[0017] 2. Three atomized liquid injection devices are evenly arranged in the circumferential direction of the injection pipe section. On the one hand, this is to prevent a single atomized liquid injection device from introducing liquid at a single point and concentrating it only in a part of the throat section, resulting in insufficient mixing; on the other hand, by evenly introducing liquid into the throat section through three points, the liquid can be evenly dispersed on the throat section, and the high-pressure gas can be mixed with more liquid.

[0018] 3. The connection between the inlet pipe and the contraction section and the connection between the outlet pipe and the expansion section are not smooth connections. Therefore, O-rings should be set at the connections to prevent the high-pressure gas from flowing out of the gap at the connection to ensure the sealing between the pipe walls and not affect the mixing of the high-pressure spiral gas and the atomized liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the utility model;

[0020] Figure 2 This is a cross-sectional view of the throat.

[0021] Figure numerals: 1-rotator, 2-inlet pipe, 3-Venturi tube, 4-outlet pipe, 5-contraction section, 6-expansion section, 7-throat section, 8-injection pipe section, 9-atomized liquid injection device, 10-connecting flange, 11-connecting rod, 12-nut, 13-O-ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1

[0024] like Figure 1As shown, an aerosol mixer for a natural gas wellhead comprises a coaxially arranged inlet pipe 2, a venturi tube 3 and an outlet pipe 4, wherein the inlet pipe 2 is connected to the air inlet of the venturi tube 3, and the outlet pipe 4 is connected to the air outlet of the venturi tube 3. A swirler 1 is provided at the inlet pipe 2, and a plurality of atomized liquid injection devices 9 are provided at the throat of the venturi tube 3. High-pressure gas is forced to generate a spiral through the swirler 1, and the high-pressure spiral gas enters the venturi tube 3. Negative pressure is generated at the edge of the throat of the venturi tube 3 to suck the atomized liquid into the center of the high-pressure spiral gas for mixing, and the high-pressure spiral gas takes away the mixed atomized liquid when passing through the throat.

[0025] High-pressure gas enters the venturi tube 3 through the inlet pipe 2, and the high-pressure gas is forced to spiral through the swirler 1 set at the inlet pipe 2. The high-pressure spiral gas enters the narrowest part of the venturi tube 3. The speed of the high-pressure spiral gas increases because the cross-sectional area of ​​the flow is reduced. The entire flow must undergo the pipeline contraction process at the same time, so the pressure is also reduced at the same time, thereby generating a pressure difference, that is, the throat edge of the venturi tube 3 generates negative pressure to suck the atomized liquid into the center of the high-pressure spiral gas for mixing, and the high-pressure spiral gas takes away the mixed atomized liquid when passing through the throat. The negative pressure generated by the throat edge of the venturi tube sucks the atomized liquid into the center of the high-pressure spiral gas for mixing, and the high-pressure spiral gas itself is disturbed up and down, so that the mixing with the atomized liquid is more sufficient.

[0026] Example 2

[0027] This embodiment further elaborates and supplements the implementation method of the utility model on the basis of Embodiment 1.

[0028] As an implementation method of this embodiment, Figure 1 As shown, the venturi tube 3 includes a contraction section 5, a throat section 7 and an expansion section 6. The air outlet of the inlet pipe 2 is connected to the contraction section 5, the contraction section 5 is connected to the throat section 7, and the air outlet of the throat section 7 is connected to the expansion section 6. The venturi tube 3 is a pipe that gradually contracts and then expands, so the venturi tube 3 is configured as a contraction section 5, a throat section 7 and an expansion section 6. The inner diameter of the contraction section 5 at the air outlet is the same as the inner diameter of the throat section 7, the inner diameter of the expansion section 6 at the air inlet is the same as the inner diameter of the throat section 7, and the cross-sectional area of ​​the inner diameter of the throat section 7 is the smallest cross-sectional area of ​​the venturi tube 3.

[0029] As another implementation method of this embodiment, Figure 1-Figure 2As shown, the throat section 7 is extended upwardly to be provided with an injection pipe section 8, and the injection pipe section 8 is evenly provided with three atomized liquid injection devices 9 in the circumferential direction for injecting atomized liquid into the throat section 7. On the one hand, it is to prevent a single atomized liquid injection device 9 from introducing liquid at a single point and concentrating it only in a part of the throat section 7, resulting in insufficient mixing; on the other hand, by evenly introducing liquid into the throat section 7 at three points, the liquid can be evenly dispersed on the throat section 7, and high-pressure spiral gas can achieve an efficient and stable mixing effect.

[0030] Example 3

[0031] This embodiment further elaborates and supplements the implementation method of the utility model on the basis of Embodiment 2.

[0032] As an implementation method of this embodiment, the contraction section 5 adopts a gradually contracting pipeline, and the expansion section 6 adopts a gradually expanding pipeline. The venturi tube 3 is a pipeline that gradually contracts and then expands. During implementation, the high-pressure spiral gas enters the narrowest part of the venturi tube 3. The speed of the high-pressure spiral gas increases due to the reduction of the flow cross-sectional area. The entire flow must undergo the pipeline contraction process at the same time, so the pressure is also reduced at the same time, thereby generating a pressure difference. This pressure difference provides an external suction force to the fluid, sucking the atomized liquid in the throat section into the center of the high-pressure spiral gas for mixing.

[0033] As another implementation method of this embodiment, Figure 1 As shown, the inner diameter of the end of the inlet pipe 2 gradually decreases along the flow direction of the high-pressure gas to match the inner diameter of the front end of the contraction section; the inner diameter of the front end of the outlet pipe 4 gradually decreases against the flow direction of the high-pressure gas to match the inner diameter of the end of the expansion section 6.

[0034] Example 4

[0035] This embodiment further elaborates and supplements the implementation method of the utility model on the basis of Embodiment 2 or Embodiment 3.

[0036] As an implementation method of this embodiment, Figure 1 As shown, it also includes fasteners, which include a connecting flange 10 and a connecting rod 11 with threads at both ends. The connecting flange 10 is respectively assembled at the connection between the inlet pipe 2 and the contraction section 5 and at the connection between the outlet pipe 4 and the expansion section 6. The connecting rod 11 passes through the connecting flange 10 and is fastened by a nut 12.

[0037] As another implementation of this embodiment, an O-ring 13 is provided at the connection between the inlet pipe 2 and the contraction section 5; and an O-ring 13 is provided at the connection between the outlet pipe 4 and the expansion section 6. The connection between the inlet pipe 2 and the contraction section 5 and the connection between the outlet pipe 4 and the expansion section 6 are not smooth connections, so an O-ring 13 is provided at the connection to prevent the high-pressure gas from flowing out of the gap at the connection, to ensure the sealing between the pipe walls, and not to affect the mixing of the high-pressure spiral gas and the atomized liquid.

Claims

1. An aerosol mixer for a natural gas wellhead, characterized in that: The invention comprises an inlet pipe (2), a venturi tube (3) and an outlet pipe (4) which are coaxially arranged. The inlet pipe (2) is connected to the air inlet of the venturi tube (3), and the outlet pipe (4) is connected to the air outlet of the venturi tube (3). A swirler (1) is provided at the inlet pipe (2), and a plurality of atomized liquid injection devices (9) are provided at the throat of the venturi tube (3). High-pressure gas is forced to generate a spiral through the swirler (1). The high-pressure spiral gas enters the venturi tube (3), and negative pressure is generated at the edge of the throat of the venturi tube (3) to suck the atomized liquid into the center of the high-pressure spiral gas for mixing. When the high-pressure spiral gas passes through the throat, the mixed atomized liquid is taken away.

2. The gas mist mixer for a natural gas wellhead as claimed in claim 1, characterized in that: The venturi tube (3) comprises a contraction section (5), a throat section (7) and an expansion section (6); the air outlet of the inlet pipe (2) is connected to the contraction section (5), the contraction section (5) is connected to the throat section (7), and the air outlet of the throat section (7) is connected to the expansion section (6).

3. A gas mist mixer for a natural gas wellhead as claimed in claim 2, characterized in that: The throat section (7) is provided with an injection pipe section (8) extending upwards, and the injection pipe section (8) is provided with three atomized liquid injection devices (9) evenly arranged in a circumferential direction for injecting atomized liquid into the throat section (7).

4. A gas mist mixer for a natural gas wellhead as claimed in claim 2 or 3, characterized in that: The contraction section (5) adopts a gradually contracting pipe, and the expansion section (6) adopts a gradually expanding pipe.

5. The gas mist mixer for a natural gas wellhead as claimed in claim 4, characterized in that: The inner diameter of the end of the inlet pipe (2) is gradually reduced along the flow direction of the high-pressure spiral gas to match the inner diameter of the front end of the contraction section (5); the inner diameter of the front end of the outlet pipe (4) is gradually reduced against the flow direction of the high-pressure spiral gas to match the inner diameter of the end of the expansion section (6).

6. The gas mist mixer for a natural gas wellhead as claimed in claim 4, characterized in that: It also includes a fastener, which includes a connecting flange (10) and a connecting rod (11) with threads at both ends. The connecting flange (10) is respectively assembled at the connection between the inlet pipe (2) and the contraction section (5) and the connection between the outlet pipe (4) and the expansion section (6). The connecting rod (11) passes through the connecting flange (10) and is fastened by a nut (12).

7. The gas mist mixer for a natural gas wellhead as claimed in claim 6, characterized in that: An O-type sealing ring (13) is provided at the connection between the inlet pipe (2) and the contraction section (5); and an O-type sealing ring (13) is provided at the connection between the outlet pipe (4) and the expansion section (6).

Images