Oil well mouth sealing device

Abstract

The utility model discloses an oil well mouth sealing device, and relates to the technical field of sealing devices. The oil well mouth sealing device comprises an oil well, and the top end of the oil well is fixedly connected with an external thread sleeve through a flange plate; the first sealing assembly comprises an end cover arranged at the top end of the external thread sleeve, the inner ring surface of the end cover is in threaded connection with the outer surface of the external thread sleeve, and the first sealing assembly further comprises a sealing ring which is fixedly arranged on the inner top wall of the end cover and used for sealing a gap between the end cover and the top end of the external thread sleeve. According to the sealing device, when the sealing device is used for sealing an oil well, effective sealing of a wellhead of the oil well can be achieved through the first sealing assembly, the two inflation air bag rings can be expanded and abut against the inner wall of the oil well through the second sealing assembly, effective sealing of the inner wall of the oil well is achieved, and the sealing device is simple in structure and convenient to use. Therefore, the purpose of double sealing can be achieved, and the sealing effect on an oil well is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to an oil wellhead sealing device. Background Art

[0002] In order to extract oil, the holes drilled according to the well layout system of the oil field development plan are used as channels for oil to rise from the bottom of the well to the wellhead. An existing patent for a simple pressurized wellhead plugging device, patent announcement number CN216157626U, includes an oil well, an upper port of the oil well is inserted with a cannula, the lower end of the cannula is provided with a mounting plate, and the mounting plate is fixedly connected to the fixing ring at the upper end of the oil well via an arc-shaped fixing sleeve, an expansion plug is sleeved at one end of the cannula located inside the oil well, and a movable sleeve is sleeved at the upper side of the cannula, and the movable sleeve squeezes and expands the expansion plug. When the wellhead of the oil well is plugged, the cannula is inserted into the oil well and fixedly connected to the oil well via the fixed sleeve. At this time, the movable sleeve is driven to squeeze and expand the expansion plug to achieve a better seal, making it more convenient for the plugging device to plug and seal the wellhead.

[0003] The inventors believe that the following defects exist in the aforementioned related technologies: After the oil wellhead is sealed, the technical solution proposed in the aforementioned patent requires the removal of several bolts when the oil well needs to be used. These bolts, exposed to the outside air for a long time, are prone to rust, making it difficult to open the oil wellhead. Furthermore, the single-layer seal results in a poor sealing effect. Therefore, we propose an oil wellhead sealing device to address these issues. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an oil well wellhead sealing device, which solves the problem in the background art that it is inconvenient to open the oil wellhead.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oil wellhead sealing device, comprising:

[0006] An oil well, wherein the top of the oil well is fixedly connected to an externally threaded casing via a flange;

[0007] a first sealing assembly, comprising an end cap disposed at a top end of the externally threaded sleeve, wherein an inner annular surface of the end cap is threadedly connected to an outer surface of the externally threaded sleeve, and the first sealing assembly further comprising a sealing ring fixedly disposed on an inner top wall of the end cap for sealing a gap between the end cap and the top end of the externally threaded sleeve;

[0008] The second sealing assembly includes a plug-in cylinder fixedly mounted on the inner top wall of the end cover, and a piston rod slidably mounted on the inner wall of the plug-in cylinder, and the upper surface of the end cover is provided with a rotating ring for driving the piston rod to move up and down. The second sealing assembly also includes two annular grooves opened on the outer surface of the plug-in cylinder, and an inflatable airbag ring fixedly mounted on the inner wall of the annular groove.

[0009] Preferably, a plurality of connecting columns are fixedly provided on the outer surface of the end cover in a circumferential array, and operating rings are fixedly provided at the ends of the plurality of connecting columns.

[0010] Preferably, a protective cover is fixedly provided on the outer surface of the bottom end of the end cover for protecting the flange at the connection between the external threaded casing and the oil well.

[0011] Preferably, the inner top wall of the plug-in cylinder is rotatably provided with a threaded column extending to the upper surface of the end cover, and a rotation hole is opened at the top end of the threaded column, and the rotating ring is rotatably connected to the inner wall of the rotation hole.

[0012] Preferably, a lifting plate is slidably provided on the inner wall of the plug-in tube, and a threaded hole threadedly connected to the outer surface of the threaded column is provided on the upper surface of the lifting plate. Four limiting columns are fixed on the inner top wall of the plug-in tube in a circular array, and four limiting holes are provided on the upper surface of the lifting plate for the four limiting columns to slide.

[0013] Preferably, the bottom ends of the threaded column and the four limiting columns are fixed with limiting plates, and the lower surface of the lifting plate is fixed with two symmetrical connecting rods, and the bottom ends of the two connecting rods are fixedly connected to the upper surface of the piston column.

[0014] Preferably, four connecting tubes are arranged in a circular array in the middle of the two inflatable airbag rings, and the two ends of the connecting tubes extend to the interior of the two inflatable airbag rings respectively. The bottom inner ring surface of the plug-in tube is fixed with four inflatable tubes in a circular array, and the other ends of the four inflatable tubes extend to the interior of an inflatable airbag ring below. Beneficial effects

[0015] The utility model provides an oil wellhead sealing device. Compared with the prior art, it has the following beneficial effects:

[0016] The oil well wellhead sealing device is provided with a first sealing component, so that the sealing device can effectively seal the oil wellhead when sealing the oil well. When the oil well needs to be used, it is only necessary to reversely rotate the operating ring to separate the end cover from the externally threaded casing, so that the oil well can be quickly used, thereby facilitating the rapid opening and use of the oil wellhead. Moreover, by providing a second sealing component, the two inflatable airbag rings can be expanded and pressed against the inner wall of the oil well, thereby achieving effective sealing of the inner wall of the oil well, thereby achieving the purpose of double sealing and effectively ensuring the sealing effect of the oil well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;

[0020] Figure 4 For this utility model Figure 3 A in the middle is an enlarged structural diagram;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the lifting plate and piston column of the utility model.

[0022] In the picture:

[0023] 100. Oil wells;

[0024] 200, external threaded casing;

[0025] 300, first sealing assembly; 301, end cap; 302, sealing ring; 303, operating ring; 304, protective cover;

[0026] 400, second sealing assembly; 401, plug-in sleeve; 402, piston column; 403, rotating ring; 404, inflatable airbag ring; 405, threaded column; 406, lifting plate; 407, limiting column; 408, connecting rod; 409, connecting pipe; 4010, inflation pipe. DETAILED DESCRIPTION

[0027] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-5 The utility model provides a technical solution: an oil wellhead sealing device, comprising:

[0029] An oil well 100, the top of which is fixedly connected to an externally threaded casing 200 via a flange;

[0030] A first sealing assembly 300 includes an end cap 301 disposed at the top of the externally threaded sleeve 200, wherein the inner annular surface of the end cap 301 is threadedly connected to the outer surface of the externally threaded sleeve 200. The first sealing assembly 300 also includes a sealing ring 302 fixed to the inner top wall of the end cap 301 for sealing the gap between the end cap 301 and the top of the externally threaded sleeve 200;

[0031] See Figure 3 A plurality of connecting posts are fixedly provided on the outer surface of the end cover 301 in a circumferential array, and an operating ring 303 is fixedly provided at the end of the plurality of connecting posts.

[0032] The operation ring 303 is provided to facilitate personnel to rotate the end cover 301 .

[0033] See Figure 3 A protective cover 304 is fixed on the outer surface of the bottom end of the end cover 301 for protecting the flange at the connection between the external threaded casing 200 and the oil well 100.

[0034] By providing the protective cover 304 , it is possible to prevent rainwater from entering the surface of the flange and causing rust on the bolts on the surface of the flange.

[0035] In this embodiment, by providing the first sealing assembly 300, the sealing device can effectively seal the connection between the externally threaded casing 200 and the end cover 301 when sealing the oil well 100, thereby achieving effective sealing of the wellhead of the oil well 100. Moreover, when the oil well 100 needs to be used, it is only necessary to reversely rotate the operating ring 303 to separate the end cover 301 from the externally threaded casing 200, so that the oil well 100 can be quickly used, thereby facilitating the rapid opening and use of the wellhead of the oil well 100.

[0036] Example 2

[0037] Based on the first embodiment, and different from the first embodiment,

[0038] An oil wellhead sealing device further comprising:

[0039] The second sealing assembly 400 includes a plug-in cylinder 401 fixed on the inner top wall of the end cover 301, and a piston column 402 slidably arranged on the inner wall of the plug-in cylinder 401, and a rotating ring 403 for driving the piston column 402 to move up and down is provided on the upper surface of the end cover 301. The second sealing assembly 400 also includes two annular grooves opened on the outer surface of the plug-in cylinder 401, and an inflatable airbag ring 404 fixed on the inner wall of the annular groove.

[0040] See Figure 3 and Figure 4 The inner top wall of the plug-in tube 401 is rotatably provided with a threaded column 405 extending to the upper surface of the end cover 301, and the top of the threaded column 405 is provided with a rotation hole, and the rotating ring 403 is rotatably connected to the inner wall of the rotation hole.

[0041] The provision of the rotating ring 403 facilitates the rotation of the threaded column 405 .

[0042] See Figure 4 A lifting disk 406 is slidingly provided on the inner wall of the plug-in tube 401, and a threaded hole is provided on the upper surface of the lifting disk 406 which is threadedly connected to the outer surface of the threaded column 405. Four limiting columns 407 are fixed on the inner top wall of the plug-in tube 401 in a circular array, and four limiting holes are provided on the upper surface of the lifting disk 406 for the four limiting columns 407 to slide.

[0043] By providing the limiting column 407, the stability of the lifting plate 406 during lifting is effectively guaranteed.

[0044] See Figure 4 The bottom ends of the threaded column 405 and the four limiting columns 407 are fixed with limiting plates, and the lower surface of the lifting plate 406 is fixed with two symmetrical connecting rods 408, and the bottom ends of the two connecting rods 408 are fixedly connected to the upper surface of the piston column 402.

[0045] By providing the connecting rod 408 , the piston column 402 can be driven to move up and down by the lifting plate 406 .

[0046] See Figure 4 Four connecting tubes 409 are arranged in a circular array in the middle of the two inflatable airbag rings 404, and the two ends of the connecting tubes 409 extend to the interior of the two inflatable airbag rings 404 respectively. Four inflatable tubes 4010 are fixed on the inner ring surface of the bottom of the plug-in tube 401 in a circular array, and the other ends of the four inflatable tubes 4010 extend to the interior of the inflatable airbag ring 404 below.

[0047] By providing two inflatable airbag rings 404 , the inner wall of the oil well 100 can be effectively sealed.

[0048] In this embodiment, by setting up a second sealing assembly 400, after the end cover 301 is installed, the two inflatable airbag rings 404 can be expanded and pressed against the inner wall of the oil well 100, thereby achieving effective sealing of the inner wall of the oil well 100, thereby achieving the purpose of double sealing and effectively ensuring the sealing effect of the oil well 100.

[0049] Working principle: When sealing the oil well 100, the sealing device can first install the external threaded casing 200 and the wellhead of the oil well 100, and then rotate the end cover 301 through the operating ring 303 to quickly thread the end cover 301 and the external threaded casing 200. Under the action of the sealing ring 302, the connection between the external threaded casing 200 and the end cover 301 is effectively sealed, thereby achieving effective sealing of the wellhead of the oil well 100. When the oil well 100 needs to be used, it is only necessary to rotate the operating ring 303 in the opposite direction to separate the end cover 301 from the external threaded casing 200, so that the oil well 100 can be quickly used, thereby facilitating the rapid opening and use of the wellhead of the oil well 100. After the end cover 301 is installed, the end cover 301 is inserted. The connecting tube 401 can be inserted into the interior of the oil well 100. At this time, rotating the rotating ring 403 drives the threaded column 405 to rotate, and the rotation of the threaded column 405 drives the lifting plate 406 to move downward. When the lifting plate 406 moves downward, it can drive the piston column 402 to move downward through the connecting rod 408, thereby pressing the air inside the connecting tube 401 into the interior of the lower inflatable airbag ring 404 through the inflation tube 4010, and enters the interior of the other inflatable airbag ring 404 through the connecting tube 409, so that the two inflatable airbag rings 404 expand and press against the inner wall of the oil well 100, thereby achieving effective sealing of the inner wall of the oil well 100, and thus achieving the purpose of double sealing, effectively ensuring the sealing effect of the oil well 100.

[0050] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. An oil wellhead sealing device, characterized in that: include: An oil well (100), wherein the top of the oil well (100) is fixedly connected to an externally threaded casing (200) via a flange; A first sealing assembly (300), the first sealing assembly (300) comprising an end cap (301) disposed at the top end of the externally threaded sleeve (200), wherein the inner annular surface of the end cap (301) is threadedly connected to the outer surface of the externally threaded sleeve (200), and the first sealing assembly (300) further comprises a sealing ring (302) fixedly disposed on the inner top wall of the end cap (301) for sealing a gap between the end cap (301) and the top end of the externally threaded sleeve (200); The second sealing assembly (400) includes a plug-in cylinder (401) fixedly mounted on the inner top wall of the end cover (301), and a piston rod (402) slidably mounted on the inner wall of the plug-in cylinder (401), and a rotating ring (403) for driving the piston rod (402) to move up and down is provided on the upper surface of the end cover (301). The second sealing assembly (400) also includes two annular grooves provided on the outer surface of the plug-in cylinder (401), and an inflatable airbag ring (404) fixedly mounted on the inner wall of the annular groove.

2. The oil wellhead sealing device according to claim 1, characterized in that: The outer surface of the end cover (301) is fixedly provided with a plurality of connecting columns in a circumferential array, and the ends of the plurality of connecting columns are fixedly provided with operating rings (303).

3. The oil wellhead sealing device according to claim 1, characterized in that: A protective cover (304) is fixedly provided on the outer surface of the bottom end of the end cover (301) for protecting the flange at the connection between the external threaded casing (200) and the oil well (100).

4. The oil wellhead sealing device according to claim 1, characterized in that: The inner top wall of the plug-in cylinder (401) is rotatably provided with a threaded column (405) extending to the upper surface of the end cover (301), and a rotation hole is opened at the top end of the threaded column (405). The rotation ring (403) is rotatably connected to the inner wall of the rotation hole.

5. The oil wellhead sealing device according to claim 4, characterized in that: A lifting disk (406) is slidably provided on the inner wall of the plug-in tube (401), and a threaded hole threadedly connected to the outer surface of the threaded column (405) is provided on the upper surface of the lifting disk (406). Four limiting columns (407) are fixed in a circular array on the inner top wall of the plug-in tube (401), and four limiting holes for the four limiting columns (407) to slide are provided on the upper surface of the lifting disk (406).

6. The oil wellhead sealing device according to claim 5, characterized in that: The bottom ends of the threaded column (405) and the four limiting columns (407) are fixed with limiting plates, and the lower surface of the lifting plate (406) is fixed with two symmetrical connecting rods (408), and the bottom ends of the two connecting rods (408) are fixedly connected to the upper surface of the piston column (402).

7. The oil wellhead sealing device according to claim 1, characterized in that: Four connecting tubes (409) are arranged in a circular array in the middle of the two inflatable airbag rings (404), and the two ends of the connecting tubes (409) extend to the inside of the two inflatable airbag rings (404) respectively. Four inflatable tubes (4010) are fixed on the inner ring surface of the bottom of the plug-in tube (401) in a circular array, and the other ends of the four inflatable tubes (4010) extend to the inside of the inflatable airbag ring (404) below.

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