Foaming device and process pipe column with same

Abstract

The invention provides a foaming device and a process pipe column with the foaming device, and the foaming device comprises a first joint piece which is provided with an air inlet channel and a first one-way valve arranged in the air inlet channel, and a second joint piece which is provided with a second one-way valve arranged in the first one-way valve; the first end of the foaming pipe is connected with the first joint piece; the liquid inlet channel is arranged in the first connector piece, and a liquid inlet of the liquid inlet channel is located in the side wall of the first connector piece; the mixing channel is located between the intersection of the air inlet channel and the liquid inlet channel and the foaming pipe; the elastic film is arranged in the mixing channel; the rotating structure is rotatably arranged in the foaming pipe; and the second joint piece is connected with the second end of the foaming pipe. According to the technical scheme, the problem of poor foaming quality in a foam flooding technology in related technologies is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield exploitation, and in particular to a foaming device and a process pipe column having the same. Background Art

[0002] For low permeability oil fields developed by water injection, the injected water is prone to uneven displacement due to the heterogeneity of the porous medium of the reservoir and the existence of cracks. During the water flooding process, due to the difference in viscosity between the oil phase and the water phase, water flows faster than crude oil, making it easy for the injected water to advance along the dominant water flow channel or along the cracks, causing the water content of the oil well to increase and the oil production to decrease.

[0003] In related technologies, foam is used for oil recovery. Foam flooding technology has become a hot topic and focus in the field of enhanced oil recovery because it has the functions of fluidity control, expansion of sweep and improvement of oil recovery efficiency. Compared with chemical foam flooding, microbubble flooding technology produces micron-sized bubbles (chemical bubbles are generally millimeter-sized) through physical foaming, without the need to add chemical agents such as foaming agents and foam stabilizers, and its cost is lower. In particular, small bubbles are easier to enter low-permeability reservoirs for oil recovery. However, the current foam flooding ground foaming generally has poor foaming quality and severe defoaming during the foam injection operation, which cannot guarantee the quality of foam flooding. Summary of the invention

[0004] The main purpose of the present invention is to provide a foaming device and a process column having the same, so as to solve the problem of poor foaming quality in the foam flooding technology in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a foaming device, comprising: a first joint member, on which is provided an air inlet channel and a first one-way valve arranged in the air inlet channel; a foaming tube, a first end of which is connected to the first joint member; a liquid inlet channel, which is arranged in the first joint member, and a liquid inlet of the liquid inlet channel is located on the side wall of the first joint member; a mixing channel, which is located between the intersection of the air inlet channel and the liquid inlet channel and the foaming tube; an elastic membrane, which is arranged in the mixing channel; a rotating structure, which is rotatably arranged in the foaming tube; and a second joint member, which is connected to the second end of the foaming tube.

[0006] Furthermore, the first joint member has a accommodating cavity, and a sealing structure is arranged in the accommodating cavity. The sealing structure divides the accommodating cavity into a first accommodating portion and a second accommodating portion located on the periphery of the first accommodating portion and independent of the first accommodating portion. The first accommodating portion forms a mixing channel, and the second accommodating portion forms a liquid inlet channel. The sealing structure is provided with a guide hole.

[0007] Furthermore, the foaming device also includes a diffusion structure, which is arranged in the first accommodating portion and located between the guide hole and the elastic membrane.

[0008] Furthermore, the diffusion structure includes a plurality of sieves arranged in a stacked manner, and the meshes of the plurality of sieves are arranged in a staggered manner.

[0009] Furthermore, the first joint member further includes a shaft hole, the rotating structure includes a rotating shaft and a spiral structure arranged on the rotating shaft, the rotating shaft is inserted into the shaft hole, the rotating shaft passes through the accommodating cavity and extends into the foaming tube, and the spiral structure is located within the foaming tube.

[0010] Furthermore, a spiral groove is provided on the side wall of the first accommodating portion.

[0011] Furthermore, the pitch of the spiral structure is between 25 mm and 50 mm. The spiral structure includes a plurality of spirals, and the plurality of spirals form a plurality of pitch segments. Two adjacent pitch segments in sequence form a pitch group. Among the two adjacent pitch groups, the pitch group closer to the first joint member is the first pitch group, and the pitch group closer to the second joint member is the second pitch group. In the direction from the first joint member to the second joint member, the two pitch segments within the first pitch group decrease in sequence, the two pitch segments within the second pitch group decrease in sequence, the maximum value of the two pitch segments within the second pitch group is located between the two pitch segments within the first pitch group, and the minimum value of the two pitch segments within the second pitch group is less than the minimum value of the two pitch segments within the first pitch group.

[0012] Furthermore, the second joint member includes a connecting pipe section and a receiving pipe section. The first end of the connecting pipe section is connected to the foaming tube, and the second end of the connecting pipe section is connected to the receiving pipe section.

[0013] Furthermore, the connecting pipe section includes a large-diameter section and a small-diameter section. The large-diameter section is connected to the foaming tube, the small-diameter section is connected to the receiving pipe section, and a plurality of guiding grooves are provided on the inner wall of the small-diameter section. The plurality of guiding grooves extend obliquely in the direction from the first joint member to the second joint member.

[0014] Furthermore, the plurality of guiding grooves form a plurality of guiding groups. Each guiding group includes two adjacent guiding grooves. In each guiding group, in the direction from the first joint member to the second joint member, the distance between the two guiding grooves gradually increases.

[0015] Furthermore, a second one-way valve with the same conduction direction as the first one-way valve is provided within the second joint member, a third one-way valve is provided within the second accommodating portion, the diversion hole is located between the third one-way valve and the first one-way valve, and the conduction directions of the first one-way valve and the third one-way valve are opposite.

[0016] According to another aspect of the present invention, a process string is provided, which includes an outer pipe body and a foaming device arranged within the outer pipe body, and the foaming device is the above-mentioned foaming device.

[0017] Applying the technical solution of the present invention, an air inlet channel and a first one-way valve disposed in the air inlet channel are provided on the first connector. The first end of the foaming tube is connected to the first connector. The liquid inlet channel is disposed in the first connector, and the liquid inlet of the liquid inlet channel is located on the side wall of the first connector. The mixing channel is located between the confluence of the air inlet channel and the liquid inlet channel and the foaming tube. An elastic membrane is disposed in the mixing channel, and a rotating structure is rotatably disposed in the foaming tube. The second connector is connected to the second end of the foaming tube. Through the above settings, gas enters the interior of the first connector through the air inlet channel, and the first one-way valve can prevent the gas from overflowing. Liquid enters the liquid inlet channel through the liquid inlet. The gas and the liquid are mixed in the mixing channel, and after mixing, they pass through the elastic membrane. Under the action of the elastic membrane, the gas and the liquid can be dispersed, and the gas and the liquid can be better mixed, thereby generating more bubbles. The bubbles continue to enter the foaming tube, and under the action of the rotating structure, the bubbles can be further dispersed and the size of the bubbles can be further reduced, and the number of bubbles can be further increased. When the bubbles are completely produced, they can flow out through the second connector, thereby effectively realizing oil displacement. In this way, the generated bubbles have a small size and a large number, and the bubbles can have better quality after being processed multiple times, and the oil displacement effect can be improved. Therefore, the technical solution of the present application effectively solves the problem of poor foaming quality in the foam oil displacement technology in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 Shows a cross-sectional schematic view of an embodiment of a foaming device according to the present invention;

[0020] Figure 2 Shows Figure 1 A partial enlarged view of part A of the foaming device;

[0021] Figure 3 Shows Figure 1 A partial enlarged view of part B of the foaming device.

[0022] Among them, the above-mentioned drawings include the following reference numerals:

[0023] 10. First joint member; 11. Air inlet passage; 12. First one-way valve; 13. Accommodating chamber; 131. Blocking structure; 1311. Guide hole; 132. First accommodating portion; 1321. Spiral groove; 133. Second accommodating portion; 1331. Third one-way valve; 14. Axial hole; 20. Foaming tube; 30. Liquid inlet passage; 40. Mixing passage; 50. Elastic membrane; 60. Rotating structure; 61. Rotating shaft; 62. Spiral structure; 70. Second joint member; 71. Connecting pipe section; 711. Large diameter section; 712. Small diameter section; 7121. Guide groove; 72. Receiving pipe section; 73. Second one-way valve; 80. Diffusion structure. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] like Figure 1As shown, in this embodiment, the foaming device includes: a first joint member 10, a foaming tube 20, a liquid inlet channel 30, a mixing channel 40, an elastic membrane 50, a rotating structure 60, and a second joint member 70. An air inlet channel 11 and a first one-way valve 12 disposed in the air inlet channel 11 are provided on the first joint member 10. The first end of the foaming tube 20 is connected to the first joint member 10. The liquid inlet channel 30 is disposed in the first joint member 10, and the liquid inlet of the liquid inlet channel 30 is located on the side wall of the first joint member 10. The mixing channel 40 is located between the intersection of the air inlet channel 11 and the liquid inlet channel 30 and the foaming tube 20. The elastic membrane 50 is disposed in the mixing channel 40. The rotating structure 60 is rotatably disposed in the foaming tube 20. The second joint member 70 is connected to the second end of the foaming tube 20.

[0028] Applying the technical solution of this embodiment, an air inlet channel 11 and a first one-way valve 12 disposed in the air inlet channel are provided on the first joint member 10. The first end of the foaming tube 20 is connected to the first joint member 10. The liquid inlet channel 30 is disposed in the first joint member 10, and the liquid inlet of the liquid inlet channel 30 is located on the side wall of the first joint member 10. The mixing channel 40 is located between the intersection of the air inlet channel 11 and the liquid inlet channel 30 and the foaming tube 20. The elastic membrane 50 is disposed in the mixing channel 40. The rotating structure 60 is rotatably disposed in the foaming tube 20. The second joint member 70 is connected to the second end of the foaming tube 20. Through the above settings, gas enters the interior of the first joint member 10 through the air inlet channel 11, and the first one-way valve 12 can prevent the gas from overflowing. Liquid enters the liquid inlet channel 30 through the liquid inlet. The gas and liquid are mixed in the mixing channel 40, and after mixing, they pass through the elastic membrane 50. Under the action of the elastic membrane 50, the gas and liquid can be dispersed, and the gas and liquid can be better mixed, thereby generating more bubbles. The bubbles continue to enter the foaming tube 20. Under the action of the rotating structure 60, the bubbles can be further dispersed and the size of the bubbles can be further reduced, and the number of bubbles can be further increased. When the bubbles are completely produced, they can flow out through the second joint member 70, thereby effectively realizing oil displacement. In this way, the generated bubbles have a small size and a large number, and the bubbles can have better quality after being processed multiple times, and the oil displacement effect can be improved. Therefore, the technical solution of this embodiment effectively solves the problem of poor foaming quality in the foam oil displacement technology in the related art.

[0029] It should be noted that the above elastic membrane 50 is an elastic membrane microporous material.

[0030] Specifically, the elastic membrane 50 is immersed in the liquid, and the gas is initially foamed after passing through the elastic membrane 50.

[0031] Such as Figure 1 and Figure 2As shown, in this embodiment, the first joint member 10 has a receiving cavity 13 therein. A blocking structure 131 is disposed in the receiving cavity 13. The blocking structure 131 divides the receiving cavity 13 into a first receiving portion 132 and a second receiving portion 133 located outside the first receiving portion 132 and independent of the first receiving portion 132. The first receiving portion 132 forms a mixing channel 40, and the second receiving portion 133 forms a liquid inlet channel 30. A diversion hole 1311 is provided on the blocking structure 131. The blocking structure 131 can divide the receiving cavity 13 into the first receiving portion 132 and the second receiving portion 133. In this way, the first receiving portion 132 forms the mixing channel 40, and the second receiving portion 133 forms the liquid inlet channel 30. Such a setting enables the gas and the liquid to be fully mixed in the mixing channel.

[0032] Specifically, a step is formed at the receiving cavity 13 in the first joint member 10. The blocking structure 131 includes an annular shroud and an annular plate. The annular shroud abuts against the step, and the annular plate is connected to one end of the annular shroud away from the step. The diversion hole 1311 is disposed close to the step. In this way, the flow direction of the liquid from the outside to the second receiving portion 133 is S-shaped, which can increase the flow distance of the liquid, and thus can better contact with the gas.

[0033] As Figure 1 and Figure 2 shown, in this embodiment, the foaming device further includes a diffusion structure 80. The diffusion structure 80 is disposed in the first receiving portion 132 and is located between the diversion hole 1311 and the elastic membrane 50. The setting of the diffusion structure 80 can disperse the liquid into smaller water droplets, which can make the water droplets easier to contact with the gas, and thus make the bubbles easier to generate.

[0034] As Figure 1 and Figure 2 shown, in this embodiment, the diffusion structure 80 includes a plurality of stacked screens, and the mesh holes of the plurality of screens are arranged in a staggered manner. The above setting can effectively improve the effect of liquid droplet dispersion.

[0035] As Figure 1 and Figure 2 shown, in this embodiment, the first joint member 10 further includes a shaft hole 14. The rotating structure 60 includes a rotating shaft 61 and a spiral structure 62 disposed on the rotating shaft 61. The rotating shaft 61 is inserted into the shaft hole 14. The rotating shaft 61 passes through the receiving cavity 13 and extends into the foaming tube 20. The spiral structure 62 is located in the foaming tube 20. The above setting enables the rotating shaft 61 to drive the spiral structure 62 to rotate, and thus can fuse and break up the liquid and the gas into bubbles.

[0036] As Figure 1 and Figure 2As shown, in this embodiment, a spiral groove 1321 is provided on the side wall of the first accommodating portion 132. The provision of the spiral groove 1321 can change the radially flowing liquid into an axially flowing liquid, and can cause the liquid to rotate under the action of the spiral groove 1321, thereby enabling the liquid to flow a longer distance, so that the gas and the liquid can be better fused.

[0037] As Figures 1 to 3 shown, in this embodiment, the pitch of the spiral structure 62 is between 25 mm and 50 mm. The spiral structure 62 includes a plurality of spiral bodies, and the plurality of spiral bodies form a plurality of pitch segments. Two adjacent pitch segments in sequence form a pitch group, and among two adjacent pitch groups, the pitch group closer to the first joint member 10 is the first pitch group, and the pitch group closer to the second joint member 70 is the second pitch group. In the direction from the first joint member 10 to the second joint member 70, the two pitch segments within the first pitch group decrease in sequence, the two pitch segments within the second pitch group decrease in sequence, the maximum value among the two pitch segments within the second pitch group is located between the two pitch segments within the first pitch group, and the minimum value among the two pitch segments within the second pitch group is smaller than the minimum value among the two pitch segments within the first pitch group. The above provision can generate bubbles better. That is, when the bubbles pass through larger pitch segments, the bubbles are made larger, and when they pass through smaller pitch segments, the bubbles are made smaller. In this way, during the continuous process of the bubbles increasing and decreasing, the strength of the bubbles can be better and the size of the bubbles can be smaller, so as to ensure the quality of bubble production.

[0038] Specifically, the pitch of the pitch segment closer to the second joint member 70 is the smallest, and the pitch of the pitch segment closer to the first joint member 10 is the largest.

[0039] Preferably, in the direction from the first joint member 10 to the second joint member 70, the pitch of the first pitch segment is 50 mm, the pitch of the second pitch segment is 40 mm, the pitch of the third pitch segment is 45 mm, the pitch of the fourth pitch segment is 35 mm, the pitch of the fifth pitch segment is 40 mm, and the pitch of the sixth pitch segment is 30 mm.

[0040] Based on the multiphase flow and fluid mechanics theories, the rotation structure 60 of this embodiment designs a variable pitch guide vane microbubble generation device (i.e., the spiral structure 62), which is applicable to the persistent pressure-resistant environment of on-site injection, avoids the rupture of the foaming cavity, and improves the foaming quality.

[0041] As Figure 1 and Figure 3As shown, in this embodiment, the second joint member 70 includes a connecting pipe section 71 and a receiving pipe section 72. The first end of the connecting pipe section 71 is connected to the foaming pipe 20, and the second end of the connecting pipe section 71 is connected to the receiving pipe section 72. The above arrangement can effectively achieve connection with other pipelines, and thus enable the bubbles to be exported.

[0042] As Figure 1 and Figure 3 shown, in this embodiment, the connecting pipe section 71 includes a large-diameter section 711 and a small-diameter section 712. The large-diameter section 711 is connected to the foaming pipe 20, and the small-diameter section 712 is connected to the receiving pipe section 72. A plurality of guiding grooves 7121 are provided on the inner wall of the small-diameter section 712, and the plurality of guiding grooves 7121 extend obliquely in the direction from the first joint member 10 to the second joint member 70. The arrangement of the above guiding grooves 7121 can convert the bubbles rotating in the foaming pipe 20 into axial movement, which can increase the flow velocity of the bubbles, and thus enable the bubbles to be transported to the production layer faster, and reduce the loss of bubbles.

[0043] As Figure 1 and Figure 3 shown, in this embodiment, the plurality of guiding grooves 7121 form a plurality of guiding groups, and each guiding group includes two adjacent guiding grooves 7121. In each guiding group, in the direction from the first joint member 10 to the second joint member 70, the distance between the two guiding grooves 7121 gradually increases. The above guiding groups can improve the guiding effect, and thus reduce the rotation of the bubbles in the small-diameter section 712.

[0044] As Figure 1 and Figure 3 shown, in this embodiment, a second one-way valve 73 with the same conduction direction as that of the first one-way valve 12 is provided in the second joint member 70, a third one-way valve 1331 is provided in the second accommodating portion 133, the diversion hole 1311 is located between the third one-way valve 1331 and the first one-way valve 12, and the conduction directions of the first one-way valve 12 and the third one-way valve 1331 are opposite. The arrangement of the above second one-way valve 73 and third one-way valve 1331 can prevent backflow, and thus ensure the efficiency of bubble generation in the foaming pipe 20.

[0045] The foaming path of the foaming device in this embodiment is as follows: Water is injected into the annulus between the outer pipe body and the foaming device on the ground, and gas is injected into the foaming device. The high-pressure gas overcomes the elastic force of the valve spring and pushes the first one-way valve 12 downward to open the air inlet channel 11. The liquid enters the liquid inlet channel 30 and enters the mixing channel 40 through the third one-way valve 1331 to be mixed with the gas. After passing through the elastic membrane 50, it enters the foaming pipe 20. The tapered spiral flow channel formed by the spiral structure 62 and the inner wall of the foaming pipe 20 can not only promote the formation of microbubbles, but also increase the flow rate and turbulence intensity of the initially mixed microbubbles. The high-speed initially mixed microbubble flow continues to flow through the spiral structure 62. The spiral arrangement and lift angle of the spiral structure 62 can maintain the spiral flow state and flow rate of the foam, reduce the pressure loss, and increase the turbulence intensity of the foam flow, so as to achieve further refinement and improve the quality of microbubbles. The foaming device in this embodiment can achieve efficient and stable foaming underground, improving the oil displacement efficiency. The foaming device in this embodiment has a simple structure, is convenient to use and install and unload, has strong practicability, and can effectively improve the quality of foam generation. By making full use of the advantages of small foam particle size and good injection and migration properties, deep oil displacement is carried out to improve the oil recovery rate of oil wells.

[0046] According to another aspect of the present application, a process string is provided. The process string in this embodiment includes an outer pipe body and a foaming device disposed inside the outer pipe body, and the foaming device is the above-mentioned foaming device. The above-mentioned foaming device can improve the production efficiency of bubbles, and can improve the quality of bubbles and reduce bubble loss. Therefore, the process string having the above-mentioned foaming device also has the above-mentioned advantages.

[0047] The solution in this embodiment injects water through the annulus between the outer pipe body and the foaming device and injects gas into the foaming device. After gas-liquid mixing, under the action of pressure, gas and water are initially mixed to generate foam, which flows through the rotating structure 60 for stirring, and the foam is sheared and refined and uniformly enters the oil layer to achieve oil displacement and improve the crude oil recovery rate.

[0048] During the foaming operation, first set the packer, and put a retrievable foaming device into the outer pipe body. The foaming device can be automatically locked inside the supporting outer pipe body. Gas is injected through the foaming device, and water is injected through the annulus between the outer pipe body and the foaming device. The gas enters the inside of the foaming device to realize the initial mixing and foaming with water. The initially mixed foam then generates highly efficient and stable microbubbles through the elastic membrane 50 of the foaming device, and the microbubbles continue to be injected into the production layer through the eccentric flow regulator.

[0049] The process string in this embodiment has a simple structure, is convenient to use and install and unload, has strong practicability, and the microbubble generation method has strong safety, and can effectively improve the quality of microbubble generation. And it can achieve efficient and stable foaming underground, reduce the foam transmission distance, and reduce the probability of defoaming during deep well injection.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0051] For convenience of description, spatial relative terms such as "above", "on top of", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations should be made for the spatial relative descriptions used here.

[0052] In addition, it should be noted that using words such as "first", "second" etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0053] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A foaming device, characterized in that, Comprising: A first connector (10), on which an air inlet passage (11) and a first one-way valve (12) arranged in the air inlet passage (11) are provided; A foam tube (20), the first end of which is connected to the first connector (10); A liquid inlet passage (30) arranged in the first connector (10), and the liquid inlet of the liquid inlet passage (30) is located on the side wall of the first connector (10); A mixing passage (40) located between the confluence of the air inlet passage (11) and the liquid inlet passage (30) and the foam tube (20); An elastic membrane (50) arranged in the mixing passage (40); A rotating structure (60) rotatably arranged in the foam tube (20); A second connector (70) connected to the second end of the foam tube (20).

2. The foaming device according to claim 1, wherein There is a receiving cavity (13) in the first connector (10), and a blocking structure (131) is arranged in the receiving cavity (13). The blocking structure (131) divides the receiving cavity (13) into a first receiving part (132) and a second receiving part (133) located outside the first receiving part (132) and independent of the first receiving part (132). The first receiving part (132) forms the mixing passage (40), the second receiving part (133) forms the liquid inlet passage (30), and a diversion hole (1311) is arranged on the blocking structure (131).

3. The foaming device according to claim 2, characterized in that, The foam device further includes a diffusion structure (80), and the diffusion structure (80) is arranged in the first receiving part (132) and is located between the diversion hole (1311) and the elastic membrane (50).

4. The foaming device according to claim 3, wherein, The diffusion structure (80) includes a plurality of stacked screens, and the mesh holes of the plurality of screens are arranged in a staggered manner.

5. The foaming device according to claim 2, characterized in that, The first connector (10) further includes a shaft hole (14). The rotating structure (60) includes a rotating shaft (61) and a spiral structure (62) arranged on the rotating shaft (61). The rotating shaft (61) is inserted into the shaft hole (14), the rotating shaft (61) passes through the receiving cavity (13) and extends into the foam tube (20), and the spiral structure (62) is located in the foam tube (20).

6. The foaming device according to claim 2, wherein A spiral groove (1321) is arranged on the side wall of the first receiving part (132).

7. The foaming device according to claim 5, characterized in that, The pitch of the spiral structure (62) is between 25 mm and 50 mm. The spiral structure (62) includes a plurality of helices, and the plurality of helices form a plurality of pitch segments. Two adjacent pitch segments form a pitch group in sequence. Among two adjacent pitch groups, the pitch group closer to the first joint (10) is the first pitch group, and the pitch group closer to the second joint (70) is the second pitch group. In the direction from the first joint (10) to the second joint (70), the two pitch segments within the first pitch group decrease in sequence, and the two pitch segments within the second pitch group decrease in sequence. The maximum value of the two pitch segments within the second pitch group is located between the two pitch segments within the first pitch group, and the minimum value of the two pitch segments within the second pitch group is less than the minimum value of the two pitch segments within the first pitch group.

8. The foaming device according to claim 1, wherein The second joint (70) includes a connecting pipe segment (71) and a receiving pipe segment (72). The first end of the connecting pipe segment (71) is connected to the foam pipe (20), and the second end of the connecting pipe segment (71) is connected to the receiving pipe segment (72).

9. The foaming device according to claim 8, characterized in that, The connecting pipe segment (71) includes a large-diameter segment (711) and a small-diameter segment (712). The large-diameter segment (711) is connected to the foam pipe (20), and the small-diameter segment (712) is connected to the receiving pipe segment (72). A plurality of guide grooves (7121) are provided on the inner wall of the small-diameter segment (712), and the plurality of guide grooves (7121) extend obliquely in the direction from the first joint (10) to the second joint (70).

10. The foaming device according to claim 9, characterized in that The plurality of guide grooves (7121) form a plurality of guide groups. Each guide group includes two adjacent guide grooves (7121). In each guide group, in the direction from the first joint (10) to the second joint (70), the distance between the two guide grooves (7121) gradually increases.

11. The foaming device according to claim 2, characterized in that, A second one-way valve (73) with the same conduction direction as the first one-way valve (12) is provided in the second joint (70). A third one-way valve (1331) is provided in the second accommodating portion (133). The diversion hole (1311) is located between the third one-way valve (1331) and the first one-way valve (12). The conduction directions of the first one-way valve (12) and the third one-way valve (1331) are opposite.

12. A process string, comprising an outer pipe body and a foaming device disposed within the outer pipe body, characterized in that, The foaming device is the foaming device according to any one of claims 1 to 11.

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