Liquid defoamer

Abstract

The utility model discloses a liquid defoaming device which comprises a defoaming device tank with a hollow cavity inside, an air inlet is formed in the lower portion of the defoaming device tank, an air outlet is formed in the upper portion of the defoaming device tank, the air inlet is inwards connected with an air inlet pipeline and extends to the middle of the hollow cavity, and a pipe opening of the air inlet pipeline is arranged upwards. The defoamer tank body is provided with a liquid dosing port, the liquid dosing port is inwards connected with a first dosing pipeline and extends to the position above a pipe opening of the gas inlet pipeline, a gas mixing cover is arranged above the pipe opening of the gas inlet pipeline, and an opening of the gas mixing cover is arranged downwards; a pipe orifice of the first dosing pipeline penetrates into the gas mixing cover from the top of the gas mixing cover and is provided with a spray head in a positioning manner; and a pipe orifice of the gas inlet pipeline is positioned within the covering range of the gas mixing cover. By changing the flow direction of the fluid, the fluid and the defoaming agent are fully mixed and subjected to physicochemical reaction within a small range, and the purpose of fully defoaming is achieved.

Description

Technical Field

[0001] This utility model relates to a liquid defoamer, belonging to the field of shale gas or natural gas extraction and transportation technology. Background Technology

[0002] In natural gas and shale gas extraction, various additives are often added downhole due to various adverse factors. For example, foaming agents are added downhole to remove produced water, which is often produced during extraction; antifreeze is added due to low winter temperatures; and corrosion inhibitors are added if the produced fluid is corrosive. Therefore, these additives must be removed after natural gas and shale gas are extracted.

[0003] Currently, many defoaming processes at well sites involve directly injecting defoamer into the inlet pipe at the front end of the separator, with the defoaming process completed within the separator. However, several problems have been found during actual operation: the medium has high pressure and high flow rate in the pipeline, leaving insufficient reaction time for the injected defoamer; the defoamer injected directly into the pipeline via an injection pump does not mix with the gas containing the foaming agent, preventing sufficient contact between the foaming agent and the defoamer to produce a physicochemical reaction; furthermore, the existing injection method is continuous, while the well site's fluid inflow is intermittent, resulting in insufficient defoamer dosage when the fluid inflow is large, thus leading to incomplete defoaming.

[0004] Such problems may lead to blockage of separator filter elements, increased metering error of flow meters, high failure rate of booster pumps, and will also accelerate the contamination of downstream triethylene glycol equipment. Summary of the Invention

[0005] To address the shortcomings of the existing technology, this invention proposes a liquid defoamer that achieves thorough defoaming by changing the fluid flow direction, allowing the fluid and defoamer to mix and react physicochemically within a small area.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a liquid defoamer, comprising a defoamer tank with a hollow cavity inside, an air inlet at the lower part and an air outlet at the upper part of the defoamer tank, the air inlet being connected inward to an air inlet pipe extending to the middle of the hollow cavity, and the inlet of the air inlet pipe being oriented upward; a liquid dosing port is provided on the defoamer tank, the liquid dosing port being connected inward to a first dosing pipe extending above the inlet of the air inlet pipe, a mixing hood being provided above the inlet of the air inlet pipe, the opening of the mixing hood being oriented downward, the inlet of the first dosing pipe penetrating through the top of the mixing hood and positioned with a nozzle, the inlet of the air inlet pipe being within the coverage area of ​​the mixing hood.

[0007] Furthermore, a second dosing pipeline branches inward from the liquid dosing port and extends above the gas mixing hood. The inlet of the second dosing pipeline is downward and equipped with a nozzle. The number of such second dosing pipelines is one.

[0008] Furthermore, a second dosing pipeline branches inward from the liquid dosing port and extends to the top of the mixing hood. The inlets of the second dosing pipeline are downward and each inlet is equipped with a nozzle. There are multiple second dosing pipelines, and the inlets of the multiple second dosing pipelines are arranged sequentially along the upper direction of the mixing hood.

[0009] Furthermore, a wire mesh demister is installed in the hollow cavity at the upper part of the defoamer tank, and the wire mesh demister is located below the air outlet.

[0010] Furthermore, a drain outlet is provided at the bottom of the defoamer tank.

[0011] Furthermore, the defoamer tank above the wire mesh demister is provided with a vent.

[0012] Furthermore, the nozzle and the spray head are connected by a flange.

[0013] The beneficial effects of this invention are as follows: Utilizing the structural features of the mixing hood, fluid is introduced into the mixing hood, where defoamer sprays are applied from the nozzles at the top of the hood. This allows the fluid and defoamer to mix repeatedly within the mixing hood, undergoing a thorough physicochemical reaction. Specifically, by changing the fluid flow direction, the fluid and defoamer are thoroughly mixed and reacted within a small area, achieving complete defoaming. Simultaneously, utilizing a multi-stage combination of dosing pipelines, the fluid and defoamer mix and defoam within the mixing hood. After overflowing the mixing hood, the fluid is again mixed and defoamed by nozzles on a second dosing pipeline. Finally, a wire mesh demister breaks down relatively large bubbles in the fluid, separating the gas and water. The gas then enters a subsequent separator for further separation, achieving complete defoaming. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] One such Figure 1The liquid defoamer shown includes a defoamer tank 3 with a hollow cavity inside. The defoamer tank 3 has an air inlet 1 at the bottom and an air outlet 5 at the top. The air inlet 1 is connected to an air inlet pipe 10 and extends to the middle of the hollow cavity, with the inlet of the air inlet pipe 10 facing upwards. The defoamer tank 3 has a liquid dosing port 7, which is connected to a first dosing pipe 70 and extends above the inlet of the air inlet pipe 10. A mixing hood 2 is installed above the inlet of the air inlet pipe 10, with the opening of the mixing hood 2 facing downwards. The inlet of the first dosing pipe 70 passes through the top of the mixing hood 2 and is equipped with a nozzle. The inlet of the air inlet pipe 10 is within the coverage area of ​​the mixing hood 2.

[0017] In this case, the mixing hood 2 can be cylindrical, trumpet-shaped, or other shapes, with a closed-loop structure along its edge. The fluid flowing upwards from the inlet of the air inlet pipe 10 mixes with the defoamer sprayed from the nozzle of the first dosing pipe 70 within the mixing hood 2. Due to the structural characteristics of the mixing hood 2, the fluid changes direction within it, resulting in multiple mixtures with the defoamer sprayed from the nozzle. As the defoamer is continuously sprayed, the liquid defoamer left along the inner wall of the mixing hood 2 forms a water curtain downwards along the edge, while the fluid overflowing downwards mixes with the defoamer again. This process achieves multiple mixing of the fluid and the defoamer, generating a physicochemical reaction and achieving the purpose of defoaming.

[0018] A second dosing pipeline 71 branches out from the liquid dosing port 7 and extends to the top of the mixing hood 2. The opening of the second dosing pipeline 71 is set downward and a nozzle is installed at the opening. There is one second dosing pipeline 71.

[0019] Alternatively, a second dosing pipeline 71 branches out from the liquid dosing port 7 and extends to the top of the mixing hood 2. The inlets of the second dosing pipeline 71 are set downwards, and each inlet is equipped with a nozzle. There are multiple second dosing pipelines 71, and the inlets of the multiple second dosing pipelines 71 are arranged sequentially along the upper part of the mixing hood 2.

[0020] The second dosing line 71 and the first dosing line 70 can branch at the liquid dosing port 7, or they can be connected internally from the liquid dosing port 7 and then branched. The specific assembly structure can be flexibly set according to the assembly site. Generally, the inlet of the air inlet line 10 is on the same vertical line as the inlets of the first dosing line 70 and the second dosing line 71 to ensure sufficient mixing and defoaming between the fluid and the defoamer. Of course, in actual application, the inlet of the air inlet line 10 may not be on the same vertical line as the inlets of the first dosing line 70 and the second dosing line 71, and they can be staggered to achieve better mixing between the fluid and the defoamer.

[0021] Finally, a wire mesh demister 4 is installed in the hollow cavity at the top of the defoamer tank 3. The wire mesh demister 4 is located below the air outlet 5. During the upward flow of the fluid, due to the presence of the wire mesh demister 4, the relatively large foams are broken when the fluid passes through the filter screen, separating the gas and water. This allows the foaming carrier (liquid containing foaming agent) to enter the drain valve for discharge, and the gas to enter the separator for further separation, thereby achieving the purpose of thorough defoaming.

[0022] To prevent nozzle clogging, a flange is used to connect the nozzle to the pipe, facilitating cleaning or nozzle replacement. A drain port 8 is located at the bottom of the defoamer tank 3; a vent port 6 is located on the defoamer tank 3 above the wire mesh demister 4, ensuring the normal and safe use of the defoamer tank 3.

[0023] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid defoamer, characterized in that: The device includes a defoamer tank (3) with a hollow cavity inside. The defoamer tank (3) has an air inlet (1) at the bottom and an air outlet (5) at the top. The air inlet (1) is connected to an air inlet pipe (10) and extends to the middle of the hollow cavity. The opening of the air inlet pipe (10) is facing upward. The defoamer tank (3) has a liquid dosing port (7) which is connected to a first dosing pipe (70) and extends to the top of the air inlet pipe (10). A mixing hood (2) is set above the opening of the air inlet pipe (10). The opening of the mixing hood (2) is facing downward. The opening of the first dosing pipe (70) is penetrated through the top of the mixing hood (2) and a nozzle is positioned therein. The opening of the air inlet pipe (10) is within the coverage area of ​​the mixing hood (2).

2. The liquid defoamer according to claim 1, characterized in that: The liquid dosing port (7) branches out into a second dosing pipeline (71) and extends to the top of the mixing hood (2). The opening of the second dosing pipeline (71) is set downward and is equipped with a nozzle. There is one second dosing pipeline (71).

3. The liquid defoamer according to claim 1, characterized in that: The liquid dosing port (7) branches out into a second dosing pipeline (71) and extends to the top of the mixing hood (2). The openings of the second dosing pipeline (71) are downward and each opening is equipped with a nozzle. There are multiple second dosing pipelines (71), and the openings of the multiple second dosing pipelines (71) are arranged sequentially along the upper direction of the mixing hood (2).

4. The liquid defoamer according to claim 1, characterized in that: A wire mesh demister (4) is installed in the hollow cavity at the upper part of the defoamer tank (3), and the wire mesh demister (4) is located below the air outlet (5).

5. The liquid defoamer according to claim 1, characterized in that: The bottom of the defoamer tank (3) is provided with a drain port (8).

6. The liquid defoamer according to claim 4, characterized in that: A vent (6) is provided on the defoamer tank (3) above the wire mesh demister (4).

7. The liquid defoamer according to claim 1, 2, or 3, characterized in that: The nozzle and the spray head are connected by a flange.

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