Well shaft body assembly for preventing and retaining water and well plugging device for preventing and retaining water

Abstract

The utility model discloses a shaft body assembly for preventing and retaining water and a well plugging device for preventing and retaining water. The shaft body assembly comprises a shaft body, a convex ring body and a connecting body. And the first welding part and the first matching part are welded and matched, so that the bottom surface of the convex ring body is welded and fixed on the first surface. The second welding part and the second matching part are in welding fit, so that the connecting body is fixed to the inner side wall of the shaft body, and the connecting body is fixed between the first face and the second face. The well lid body is inserted into the hollow part through the third opening, and the well lid body is matched with the connecting body in an abutting mode, so that the upper surface of the well lid body and the third opening are located on the same plane. According to the shaft body assembly used for preventing and retaining water, the height of the surface of a plug well is increased, rainwater is prevented from being accumulated on the surface of the shaft body assembly used for preventing and retaining water due to low lying, and therefore the rainwater is prevented from entering the shaft body assembly used for preventing and retaining water, and the storage and transportation quality of an oil body is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of well plugging, and in particular to a wellbore assembly for preventing water from flowing out and a well plugging device for preventing water from flowing out. Background Art

[0002] In the field of aerospace and aviation fuel, refueling on aircraft is usually done through the pipeline under the apron. Generally, the aviation fuel in the pipeline under the apron is usually stored in the oil hydrant well, and the operator opens the oil hydrant well to add aviation fuel, or the valve section of the pipeline is set in the oil hydrant well, and the operator usually opens the oil hydrant well to inspect the pipeline.

[0003] In the related art, the surface of the oil well is flush with the bottom of the apron, so that the apron is on a flat road surface. However, this arrangement is prone to cause rainwater to accumulate on the surface of the oil well due to the low ground, which affects the quality of aviation fuel storage and transportation. Utility Model Content

[0004] The present application provides a wellbore assembly for preventing water from flowing and a well plug device for preventing water from flowing. The arrangement of the wellbore assembly for preventing water from flowing in the present application is conducive to raising the surface of the plug well, preventing rainwater from accumulating on the surface of the wellbore assembly for preventing water from flowing due to low-lying areas, thereby preventing rainwater from entering the wellbore assembly for preventing water from flowing, and ensuring the quality of oil storage and transportation.

[0005] The technical solution is as follows:

[0006] According to a first aspect of an embodiment of the present application, a wellbore body assembly for preventing water from flowing out is provided, which is used for installing a manhole cover body and includes a wellbore body, a convex ring body and a connecting body.

[0007] The well body is provided with a first surface and a second surface in sequence along the gravity direction. The first surface is provided with a first opening, and the second surface is provided with a second opening. The first opening and the second opening are connected to form a hollow portion on the inner wall of the well body.

[0008] One of the convex ring body and the wellbore body is provided with a first welding portion, and the other is provided with a first matching portion. Through the welding cooperation between the first welding portion and the first matching portion, the bottom surface of the convex ring body is welded and fixed to the first surface. The convex ring body is provided with a third opening connected to the first opening.

[0009] One of the connecting body and the well body is provided with a second welding portion, and the other is provided with a second matching portion. Through the welding cooperation of the second welding portion and the second matching portion, the connecting body is fixed to the inner side wall of the well body, and the connecting body is fixed between the first surface and the second surface. The connecting body is provided with a fourth opening that communicates with the first opening.

[0010] The manhole cover body is inserted into the hollow part through the third opening, and the manhole cover body is fixed to the hollow part by abutting and cooperating with the connecting body, and the upper surface of the manhole cover body and the third opening are in the same plane.

[0011] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0012] By setting the convex ring body, the convex ring body is welded and fixed on the first surface, and the manhole cover body is inserted into the convex ring body and plugged into the hollow part to make the upper surface of the manhole cover body flush with the third opening, thereby raising the installation plane of the manhole cover body, so that the manhole cover body is not set below the ground, avoiding excessive accumulation of rainwater on the manhole cover body.

[0013] At the same time, the setting of the connecting body makes it possible to raise the mating surface height of the lower bottom surface of the manhole cover body without increasing the height design burden of the manhole cover body. The height of the connecting body and the height of the manhole cover body can be used to match the water-proof wellbore assembly in this embodiment, which is beneficial to improving the application scope of the wellbore body and broadening the application scenarios of the matching.

[0014] The following is a further description of the technical solution:

[0015] In one embodiment, the first welding portion is disposed around the inner side wall of the convex ring body, and the first matching portion is disposed around the first surface of the wellbore body, so that the convex ring body is welded and fixed to the first surface.

[0016] In one embodiment, the inner side wall of the well body is provided with a first connecting side wall surface bent and connected to the edge of the first opening and a second connecting side wall surface vertically connected to the edge of the second opening. The first connecting side wall surface is bent and connected to the second connecting side wall surface so that the cross-sectional area of ​​the first opening is larger than the cross-sectional area of ​​the second opening.

[0017] In one embodiment, the connecting body is provided with at least two second welding parts arranged at intervals, and the second connecting side wall surface is provided with at least two second matching parts arranged at intervals. The second welding parts and the second matching parts are welded and matched one by one, so that the outer side wall of the connecting body is welded and fixed to the second connecting side wall surface.

[0018] In one embodiment, the wellbore assembly for preventing water from flowing further comprises a flow guiding structure, which is arranged on the outer side wall of the convex ring body so that the fluid flows out through the flow guiding structure.

[0019] In one of the embodiments, the flow guiding structure includes a groove structure, and the groove structure is arranged on the outer side wall of the convex ring body so that the fluid can be discharged through the groove structure.

[0020] And / or, the flow guiding structure comprises a hydrophobic layer. The hydrophobic layer is arranged on the outer side wall of the convex ring body. The contact angle of the hydrophobic layer is greater than 90°.

[0021] In one embodiment, the cross section of the convex ring body along the gravity direction is a trapezoidal structure, so that the cross-sectional area of ​​the upper surface of the convex ring body is smaller than the cross-sectional area of ​​the lower bottom surface of the convex ring body.

[0022] In one of the embodiments, the height of the convex ring body along the gravity direction is 10 mm to 50 mm.

[0023] In one embodiment, the height difference between the height of the connection body along the gravity direction and the height of the convex ring body is 0 mm to 10 mm.

[0024] According to a second aspect of an embodiment of the present application, a well plugging device for preventing water from flowing is provided, comprising a manhole cover body and the wellbore body assembly for preventing water from flowing in the above embodiment, wherein the manhole cover body and the wellbore body assembly for preventing water from flowing are fitted together.

[0025] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0026] By setting the water-proof shaft body assembly in the above-mentioned embodiment, it is possible to raise the upper surface height of the manhole cover body so that the manhole cover body and the ground are not in the same plane, thereby avoiding the accumulation of water above the manhole cover body caused by the low ground and destroying the stability of the storage in the bolt well.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 It is a schematic diagram of the matching structure of the wellbore body and the manhole cover body in the related technology.

[0030] Figure 2 It is a schematic structural diagram of a well plugging device for preventing water from flowing in one embodiment.

[0031] Figure 3 for Figure 2 A schematic structural diagram of a wellbore assembly for preventing water from flowing is shown in FIG.

[0032] Figure 4 for Figure 3 The structural schematic diagram of the convex ring body is shown in FIG.

[0033] Figure 5 Schematic diagram of the structure of the flow guide structure in one embodiment.

[0034] Figure 6 for Figure 2 Schematic diagram of the cooperation between the convex ring body and the connecting body on the wellbore body shown in .

[0035] 10. A plug device for preventing water from flowing into a well; 100. A wellbore assembly for preventing water from flowing into a well; 110. A wellbore body; 111. A first surface; 1111. A first opening; 112. A second surface; 1121. A second opening; 113. A hollow portion; 114. A first connecting side wall surface; 115. A second connecting side wall surface; 120. A convex ring body; 121. A third opening; 130. A connecting body; 131. A fourth opening; 140. A flow guide structure; 200. A well cover body. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0037] In related technologies, such as Figure 1 As shown, a bolt well is usually provided on the ground P of the apron, and an oil storage tank is generally stored under the bolt well. The oil storage tank is used to store aviation fuel for refueling aircraft. Alternatively, a valve section or maintenance section of the oil pipeline can also be stored under the bolt well to facilitate operators to open the bolt well cover to inspect or open the oil system. Figure 1 As shown, most of them adopt a design that is flush with the ground P (that is, the upper surfaces of the shaft body 110 and the manhole cover body 200 are located in the same plane) to avoid forming a bulge on the ground P.

[0038] However, when some refueling hydrant wells are located in low-lying areas of the apron taxiway pavement, every spring or rainy season in the south, due to heavy and intensive rain, rainwater from a large area of ​​the entire apron gathers and flows from high to low areas. Due to the poor sealing of the refueling hydrant well cover and other reasons, rainwater flows over the refueling hydrant well cover and seeps into the refueling hydrant well shaft, and even fills the entire refueling hydrant well shaft. The water surface is at the same height as the top surface assembly of the refueling hydrant, resulting in the ground well joint of the pipeline refueling truck being unable to connect to the refueling hydrant well, affecting the normal use of the refueling hydrant well and the normal refueling and support operations of the aircraft. Only by immediately calling the on-duty multi-functional pumping truck to rush to the scene to pump out clean water can the ground well joint be unloaded for refueling operations. This affects the docking and refueling time of the refueling truck's oil pipeline. In severe cases, it may cause flight delays due to fuel support reasons, or cause the water content of the aircraft refueled to exceed the standard, endangering the flight safety of aircraft.

[0039] Based on this, Figures 2 to 3 As shown, the present application provides a well plugging device 10 for preventing water from flowing, comprising a well body assembly 100 for preventing water from flowing and a well cover body 200, wherein the well cover body 200 is fitted with the well body assembly 100 for preventing water from flowing.

[0040] Specifically, the wellbore assembly 100 for preventing water from flowing includes a wellbore body 110 , a convex ring body 120 and a connecting body 130 .

[0041] The wellbore body 110 is provided with a first surface 111 and a second surface 112 in the gravity direction. The first surface 111 is provided with a first opening 1111, and the second surface 112 is provided with a second opening 1121. The first opening 1111 and the second opening 1121 are connected to form a hollow portion 113 on the inner side wall of the wellbore body 110. The hollow portion 113 is used to place an oil storage barrel or an oil transportation system (such as a valve assembly or a specific oil transportation pipeline for maintenance).

[0042] One of the convex ring body 120 and the wellbore body 110 is provided with a first welding portion, and the other is provided with a first matching portion. Through the welding cooperation of the first welding portion and the first matching portion, the bottom surface of the convex ring body 120 is welded and fixed to the first surface 111. The convex ring body 120 is provided with a third opening 121 connected to the first opening 1111.

[0043] One of the connecting body 130 and the wellbore body 110 is provided with a second welding portion, and the other is provided with a second matching portion. Through the welding cooperation of the second welding portion and the second matching portion, the connecting body 130 is fixed to the inner side wall of the wellbore body 110, and the connecting body 130 is fixed between the first surface 111 and the second surface 112. The connecting body 130 is provided with a fourth opening 131 that communicates and cooperates with the first opening 1111.

[0044] The manhole cover body 200 is inserted into the hollow portion 113 through the third opening 121 , and the manhole cover body 200 is fixed to the hollow portion 113 by abutting against the connecting body 130 , and the upper surface of the manhole cover body 200 is in the same plane as the third opening 121 .

[0045] It can be understood that the shaft body 110 is embedded in the apron ground P, so that the first surface 111 of the shaft body 110 is flush with the ground P. Generally, in the related art, the manhole cover body 200 is directly plugged and fixed to the shaft body 110, so that the first surface 111 is flush with the upper surface of the manhole cover body 200. In this embodiment, the convex ring body 120 is provided, so that the convex ring body 120 is welded and fixed on the first surface 111, and the manhole cover body 200 is plugged into the convex ring body 120 and plugged into the hollow part 113, so that the upper surface of the manhole cover body 200 is flush with the third opening 121, thereby raising the installation plane of the manhole cover body 200, so that the manhole cover body 200 is not set below the ground P, and excessive accumulation of rainwater on the manhole cover body 200 is avoided.

[0046] At the same time, the setting of the connecting body 130 makes it possible to raise the mating surface height of the lower bottom surface of the manhole cover body 200 without increasing the height design burden of the manhole cover body 200. The height of the connecting body 130 and the height of the manhole cover body 200 can be used to match the water-proof manhole body assembly 100 in this embodiment, which is beneficial to improving the application scope of the manhole body and broadening the application scenarios of the matching.

[0047] It should be noted that the convex ring body 120 can be welded to any position of the first surface 111 and can be selected according to different usage requirements, and no excessive restrictions are made here.

[0048] In some embodiments, the first welding portion is disposed around the inner side wall of the convex ring body 120, and the first matching portion is disposed around the first surface 111 of the wellbore body 110, so that the inner side wall of the convex ring body 120 is welded and fixed to the wellbore body 110 on the first surface 111. That is, the inner side wall of the convex ring body 120 is provided with the first welding portion, and at this time, the first welding portion is welded and fixed to the first surface 111 in a whole circle. It should be noted that the first welding portion is equivalent to a welding ring, and the welding ring is matched with the wellbore body 110 on the first surface 111, which can be abutting to achieve welding and fixing between surfaces, or sleeve fitting to achieve welding and fixing between the edge of the first welding portion and the outer side wall of the wellbore body 110 on the first surface 111, etc., and no excessive restrictions are made here.

[0049] It can be understood that by fully welding the convex ring body 120 to the wellbore body 110, the fixing hardness of the convex ring body 120 on the wellbore body 110 can be improved, thereby improving the anti-collision performance and effectively avoiding the risk of the wellbore body assembly 100 used for water-blocking protruding from the ground P and being damaged.

[0050] It should be noted that in the above-mentioned embodiment, the wellbore body 110 can be a straight cylinder or other shapes, and again, no excessive restrictions are imposed.

[0051] In combination with any of the above embodiments of the wellbore body 110, Figure 3 As shown, the inner side wall of the shaft body 110 is provided with a first connecting side wall surface 114 bent and connected to the edge of the first opening 1111 and a second connecting side wall surface 115 vertically connected to the edge of the second opening 1121. The first connecting side wall surface 114 is bent and connected to the second connecting side wall surface so that the cross-sectional area of ​​the first opening 1111 is larger than the cross-sectional area of ​​the second opening 1121. It can be understood that this design makes at least part of the inner side wall of the shaft body 110 in an inverted trapezoidal setting. At this time, the setting from large to small can provide an abutment limit for the fixation of the manhole cover body 200 in the hollow part 113, and this design method has a simple structure, is easy to set up, and is conducive to reducing costs. Furthermore, the inverted trapezoidal setting is also convenient for plugging and welding the body, avoiding the cross-section of the first connecting side wall surface 114 being too small to form an obstruction during plugging and moving.

[0052] It should be noted that, in this embodiment, the connecting body 130 can be fixed to the second connecting side wall surface 115 or the first connecting side wall surface 114. In addition, the second welding portion can be a continuously arranged mounting ring or a convex block arrangement, etc., and no excessive restrictions are imposed on the former.

[0053] In a specific embodiment, the connecting body 130 is provided with at least two second welding parts arranged at intervals, and the second connecting side wall surface 115 is provided with at least two second matching parts arranged at intervals. The second welding parts and the second matching parts are welded and matched one by one, so that the outer side wall of the connecting body 130 is welded and fixed to the second connecting side wall surface 115. In this way, different from setting the connecting body 130 on the inclined surface of the first connecting side wall surface 114, welding the connecting body 130 on the side of the second connecting wall is more convenient for fixing the second welding part, and in order to make the connecting body 130 match the inner side wall of the wellbore body 110, it is not necessary to make the connecting body 130 too large, which is convenient for processing and reduces processing costs.

[0054] In another specific embodiment, the connecting body 130 is provided with at least two second welding parts arranged at intervals, and the first connecting side wall surface 114 is provided with at least two second matching parts arranged at intervals. The second welding parts and the second matching parts are welded and matched one by one, so that the outer wall of the connecting body 130 is welded and fixed to the second connecting side wall surface 115. In this way, the connecting body 130 is welded and arranged on the side of the first connecting wall, and the characteristics of the inclined surface of the side of the first connecting wall can be used to provide a certain support force for the connecting body 130, so as to improve the fixed matching strength of the connecting body 130 on the inner wall of the wellbore body 110.

[0055] It is understandable that the welding cooperation between the second welding part and the second matching part in the above embodiment is through point-to-point welding cooperation. In this way, this welding cooperation mode can be adapted to the relatively stable fixed environment in the wellbore body 110 and will not be subject to large impact interference from the outside. At the same time, it can improve welding efficiency and reduce welding procedures.

[0056] It should be noted that, in one example, the second matching portion can be a boss disposed on the inner wall of the wellbore body 110, and the boss abuts and fixes the connecting body 130, and then the second welding portion and the second matching portion are welded to achieve fixation of the connecting body 130 and the boss.

[0057] In order to improve the drainage performance of the wellbore assembly 100 for preventing water from flowing, in combination with any of the above embodiments of the wellbore assembly 100 for preventing water from flowing, as Figure 4 As shown, the cross section of the convex ring body 120 along the gravity direction is a trapezoidal structure, so that the cross-sectional area of ​​the upper surface of the convex ring body 120 is smaller than the cross-sectional area of ​​the lower bottom surface of the convex ring body 120. In this way, rainwater on the manhole cover body 200 can slide down the inclined surface of the trapezoidal structure and drain to the ground P, so that it cannot enter the hollow portion 113 through the manhole cover body 200.

[0058] Furthermore, in some embodiments, Figure 5 As shown, the wellbore assembly 100 for preventing water blocking further includes a flow guiding structure 140. The flow guiding structure 140 is disposed on the outer side wall of the convex ring body 120 so that the fluid flows out through the flow guiding structure 140. It can be understood that, by disposing the flow guiding structure 140 on the outer side wall of the convex ring body 120, rainwater on the upper surface of the well cover body 200 can flow through the flow guiding structure 140 to the outer side wall of the convex ring body 120 for discharge, thereby avoiding the accumulation of rainwater on the well cover body 200.

[0059] It should be noted that the guide structure 140 may be, but is not limited to, an oblique groove, a hydrophobic layer structure, or a combination thereof, and no further limitations are imposed herein.

[0060] In a specific embodiment, Figure 5As shown, the guide structure 140 includes a groove structure, and the groove structure is arranged on the outer side wall of the convex ring body 120 so that the fluid can be discharged through the groove structure. In this way, the arrangement of the groove structure can form a height difference between the manhole cover body 200 and the groove structure, so that rainwater on the manhole cover body 200 can be discharged through the groove structure. Further, the groove structure can be an oblique groove structure arranged on the upper surface of the convex ring body 120, and the oblique groove structure is inclined from high to low along the two sides of the convex ring body 120, so that rainwater can be discharged from the oblique groove structure by gravity.

[0061] In another specific embodiment, the flow guiding structure 140 includes a hydrophobic layer. The hydrophobic layer is disposed on the outer side wall of the convex ring body 120. The contact angle of the hydrophobic layer is greater than 90°. Thus, by disposing the hydrophobic layer, rainwater can be prevented from penetrating into the convex ring body 120. Furthermore, the disposing of the hydrophobic layer can also increase the outflow speed of rainwater and avoid long-term accumulation.

[0062] It should be noted that the material of the hydrophobic layer may be, but is not limited to, waterproof paint or a plastic baffle, and may also be set based on the material of the convex ring body 120 .

[0063] In one embodiment, the convex ring body 120 is a metal convex ring body 120, which is formed by integral stamping or milling of a metal plate. At this time, since the metal material is inherently hydrophobic (i.e., waterproof), the hydrophobic layer can be integrally formed with the convex ring body 120. In this way, there is no need to additionally process the hydrophobic layer, saving processing costs. Furthermore, the structural hardness of the metal convex ring body 120 is better, so that the wellbore assembly 100 for preventing water from flowing has both windproof, anti-collision and waterproof functions.

[0064] It should be noted that the height of the convex ring body 120 in the above embodiment can be of any size and can be selected according to the actual production scenario.

[0065] In one embodiment, if Figure 6 As shown, the height H1 of the convex ring body 120 along the gravity direction is 10 mm to 50 mm. In this way, the convex ring body 120 will not protrude too high from the ground P, thereby interfering with the driving of vehicles or taxiing of aircraft on the apron; at the same time, the height of the convex ring body 120 is sufficient to lift the manhole cover body 200, so that the manhole cover body 200 will not form excessive rainwater accumulation.

[0066] In one example, the height H1 of the convex ring body 120 along the gravity direction is 15 mm to 40 mm. In this way, this size can meet the requirement of not accumulating rainwater on the manhole cover body 200, and will not be too high to cause interference with formation or flight gliding.

[0067] In another example, the height H1 of the convex ring body 120 along the gravity direction is 15 mm to 30 mm. In this way, this size can achieve both non-interference with apron driving and avoid rainwater accumulation.

[0068] In one embodiment, the height H1 of the convex ring body 120 along the gravity direction can be any one of 15 mm, 20 mm, 25 mm and 30 mm, and can be selected according to different usage requirements.

[0069] It should be noted that the height of the connection body 130 can also be any size and can be selected according to actual production requirements.

[0070] In some embodiments, the height difference between the height H1 of the connecting body 130 along the gravity direction and the height H2 of the convex ring body 120 is 0 mm to 10 mm. In this way, the connecting body 130 can be used to reduce the size difference that needs to be processed more for the manhole cover body 200, thereby reducing the processing amount of the manhole cover body 200 and reducing costs.

[0071] Furthermore, in a specific embodiment, the height of the connecting body 130 along the gravity direction is equal to the height of the convex ring body 120. That is, the connecting body 130 raises the lower bottom surface of the manhole cover body 200 by the same amount as the convex ring body 120 raises the upper surface of the manhole cover body 200. In this way, the size of the manhole cover body 200 can be met without changing the size of the manhole cover body 200, reducing the processing steps, and being applicable to manhole cover bodies 200 of various heights, broadening the application scenarios.

[0072] In one example, the height difference between the height H1 of the connection body 130 along the gravity direction and the height H2 of the convex ring body 120 is 0 mm to 5 mm. Thus, the smaller the height difference, the smaller the height change of the manhole cover body 200 can be, which reduces material loss and helps to reduce costs.

[0073] In another example, the height difference between the height H1 of the connection body 130 along the gravity direction and the height H2 of the convex ring body 120 can be any one of 0mm, 1mm, 2mm, 3mm, 4mm or 5mm. In this way, the size can provide a certain processing error for the processing of the connection body 130, and can ensure that the manhole cover body 200 will not be lower than the upper surface of the convex ring body 120, thereby avoiding the accumulation of rainwater on the manhole cover body 200.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. The technical contents disclosed above can be used to make slight changes or modifications to equivalent implementation methods with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above implementation methods based on the technical essence of the present application without departing from the contents of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A water-proof wellbore assembly for installing a well cover body, characterized in that: include: The shaft body is provided with a first surface and a second surface in sequence along the gravity direction; the first surface is provided with a first opening, and the second surface is provided with a second opening; the first opening and the second opening are connected to form a hollow portion on the inner wall of the shaft body; A convex ring body, wherein one of the convex ring body and the wellbore body is provided with a first welding portion, and the other is provided with a first matching portion; the bottom surface of the convex ring body is welded and fixed to the first surface through the welding cooperation between the first welding portion and the first matching portion; the convex ring body is provided with a third opening connected with the first opening; and A connecting body; one of the connecting body and the wellbore body is provided with a second welding portion, and the other is provided with a second matching portion; the connecting body is fixed to the inner side wall of the wellbore body through the welding cooperation of the second welding portion and the second matching portion, and the connecting body is fixed between the first surface and the second surface; the connecting body is provided with a fourth opening communicating with the first opening; wherein, The manhole cover body is inserted into the hollow portion through the third opening, and the manhole cover body is fixed to the hollow portion by abutting with the connecting body, and the upper surface of the manhole cover body and the third opening are in the same plane.

2. The wellbore assembly for preventing water from flowing according to claim 1, characterized in that: The first welding portion is disposed around the inner side wall of the convex ring body, and the first matching portion is disposed around the first surface of the wellbore body, so that the convex ring body is welded and fixed to the first surface.

3. The wellbore assembly for preventing water from flowing according to claim 1, characterized in that: The inner wall of the well body is provided with a first connecting side wall surface bent and connected to the edge of the first opening and a second connecting side wall surface vertically connected to the edge of the second opening; the first connecting side wall surface is bent and connected to the second connecting side wall surface so that the cross-sectional area of ​​the first opening is larger than the cross-sectional area of ​​the second opening.

4. The wellbore assembly for preventing water from flowing according to claim 3, characterized in that: The connecting body is provided with at least two second welding parts arranged at intervals, and the second connecting side wall surface is provided with at least two second matching parts arranged at intervals; the second welding parts and the second matching parts are welded and matched one by one, so that the outer side wall of the connecting body is welded and fixed to the second connecting side wall surface.

5. The wellbore assembly for preventing water according to claim 1, characterized in that: The wellbore assembly for preventing water from flowing further comprises a flow guiding structure; the flow guiding structure is arranged on the outer side wall of the convex ring body so that the fluid flows out through the flow guiding structure.

6. The wellbore assembly for preventing water from flowing according to claim 5, characterized in that: The flow guiding structure comprises a groove structure, and the groove structure is arranged on the outer side wall of the convex ring body so that the fluid can be discharged through the groove structure; And / or, the guide structure includes a hydrophobic layer; the hydrophobic layer is arranged on the outer side wall of the convex ring body; and the contact angle of the hydrophobic layer is greater than 90°.

7. The wellbore assembly for preventing water from flowing according to claim 1, characterized in that: The cross section of the convex ring body along the gravity direction is a trapezoidal structure, so that the cross-sectional area of ​​the upper surface of the convex ring body is smaller than the cross-sectional area of ​​the lower bottom surface of the convex ring body.

8. The wellbore assembly for preventing water from flowing according to any one of claims 1 to 6, characterized in that: The height of the convex ring body along the gravity direction is 10 mm to 50 mm.

9. The wellbore assembly for preventing water from flowing according to claim 8, characterized in that: The height difference between the height of the connecting body along the gravity direction and the height of the convex ring body is 0 mm to 10 mm.

10. A well plugging device for preventing water, characterized in that: It comprises a manhole cover body and a water-proof manhole body assembly as described in any one of claims 1 to 9, wherein the manhole cover body is fitted with the water-proof manhole body assembly.

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