Christmas tree wellhead sealing device capable of preventing crude oil from leaking

Abstract

The invention relates to the technical field of well mouth sealing devices, in particular to a Christmas tree well mouth sealing device capable of preventing crude oil from leaking, which is characterized in that an upper supporting plate is arranged in an outer shell, and a side sealing gasket and a connecting plate are arranged on the upper supporting plate; the sealing device body comprises a lower supporting plate. The sealing structure has the beneficial effects that a high-pressure gas cavity is formed by filling gas into a cavity formed among the lower supporting plate, the inner wall of the outer shell and the upper supporting plate through the lower sealing gasket, crude oil leakage is effectively avoided, when the pressure intensity of crude oil suddenly rises and exceeds a threshold value, the crude oil leaking upwards due to damage of the formed sealing structure can be discharged through the pressure relief pipe, and the safety is improved. After pressure relief work is completed, the upper supporting plate moves downwards, the pressure relief pipe is blocked through the side sealing gasket, the phenomenon that crude oil is continuously discharged through the pressure relief pipe, and consequently the crude oil is wasted is avoided, personnel can observe through a window, and the pressure relief device serves as a sealing assembly, serves as the last sealing structure, gives response time to personnel and conducts remedy.

Description

Technical Field

[0001] The invention relates to the field of wellhead sealing devices, in particular to a Christmas tree wellhead sealing device for preventing crude oil leakage. Background Art

[0002] The Christmas tree is an indispensable wellhead device in the oil production process, and is widely used in different types of oil and gas wells such as self-flowing wells and machine-produced wells. As the key equipment at the top of the oil and gas well, the Christmas tree plays a vital role in controlling and regulating oil and gas production. It mainly consists of three core parts: casing head, tubing head and Christmas tree body.

[0003] In the prior art, a wellhead sealing device needs to be installed at the wellhead of the Christmas tree to prevent crude oil leakage.

[0004] However, the sealing device installed at the wellhead of the existing Christmas tree has only one sealing structure. When the crude oil pressure in the Christmas tree is too high, the sealing structure fails and is damaged, and the crude oil will gush out. Part of the crude oil will gush out and flow to the ground, polluting the environment and causing waste of crude oil. Personnel will not react and the remediation time is not long, which is inconvenient for personnel to use. Summary of the invention

[0005] The object of the present invention is to provide a Christmas tree wellhead sealing device for preventing crude oil leakage, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a Christmas tree wellhead sealing device for preventing crude oil leakage, comprising: an outer shell, an upper support plate is arranged in the outer shell, a side sealing gasket and a connecting plate are arranged on the upper support plate, and a threaded hole provided on the connecting plate is connected to a screw rod;

[0007] The sealing device body includes a lower support plate, which is arranged in the outer shell. A window, a pressure relief pipe and an air pump are arranged on the side of the outer shell. The air pump is connected to the connecting pipe through an air pipe, and the connecting pipe is connected to the connecting box. An air hole is opened on the connecting box.

[0008] Preferably, the upper support plate is fixedly connected with a connecting plate, the connecting plate is an "L"-shaped plate structure, the threaded hole opened on the connecting plate is threadedly connected to the screw, both ends of the screw are fixedly connected to the limit plate, the limit plate is a circular plate structure, and the limit plate located on the upper side is fixedly connected to the rotating shaft.

[0009] Preferably, the lower support plate is a circular plate-shaped structure with a hole in the middle, and the sucker rod can slide along the hole in the middle of the lower support plate. A lower sealing gasket and a limit block are fixedly connected to the lower support plate. The limit block is a square plate-shaped structure, and the limit block can slide along a limit groove opened on the inner side of the outer shell, and the limit groove is a square groove-shaped structure.

[0010] Preferably, the upper support plate is a circular plate-like structure with a hole in the middle, and the sucker rod can slide along the hole in the middle of the upper support plate. A mounting groove is provided on the side of the upper support plate, and the mounting groove is an annular groove-like structure. A side sealing gasket is arranged in the mounting groove, and the side sealing gasket is fixedly connected to the upper support plate. The upper support plate and the side sealing gasket form a complete cylindrical structure.

[0011] Preferably, a sealing device body is mounted on the Christmas tree well body by means of fixing bolts and fixing nuts, and the sealing device body comprises an outer shell, and a viewing window is arranged on a side of the outer shell.

[0012] Preferably, a connecting rod is fixedly connected to the upper surface of the lower support plate, and the connecting rod has a cylindrical structure. A rubber plug is fixedly connected to the connecting rod, and the rubber plug has a cylindrical structure. The diameter of the rubber plug is equal to the diameter of the connecting rod. The connecting rod and the rubber plug can be inserted into the air hole opened on the connecting box, and the air hole is connected to the inner cavity of the connecting box.

[0013] Preferably, a connecting box is fixedly connected to the outer shell, the inner cavity of the connecting box is communicated with the connecting tube, the connecting tube is fixedly connected to the connecting box, the other end of the connecting tube extends to the inner cavity formed between the outer shell and the upper support plate, and a plurality of side support plates are fixedly connected to the upper support plate, the side support plates are in an arc-shaped plate structure, and the side support plates are in contact with the inner side surfaces of the outer shell.

[0014] Preferably, the connecting pipe is fixedly connected to the air pipe, the other end of the air pipe is fixedly connected to the exhaust end of the air pump, the air pump is fixedly installed on the outer shell, the outer shell is fixedly connected with a pressure relief pipe, a window and a connecting block, the connecting block is an arc-shaped plate structure, a support rod is fixedly connected to the connecting block, the support rod is a cylindrical structure, and the other end of the support rod is fixedly connected to the lower support plate.

[0015] Preferably, the rotating shaft is rotatably connected to the outer shell, and a worm wheel is fixedly connected to the rotating shaft, the worm wheel and the worm are meshed for transmission, the worm is fixedly connected to the transmission shaft of the motor, and the motor is fixedly installed in the outer shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The oil tree wellhead sealing device for preventing crude oil leakage proposed by the present invention can effectively prevent crude oil from continuing to leak upward from the joint by means of the lower sealing gasket fixedly connected to the lower support plate and the gas filled in the cavity formed between the lower support plate and the inner wall of the outer shell and the upper support plate. When the crude oil pressure in the main body of the oil tree well suddenly rises and exceeds the threshold value, the formed sealing structure is damaged, and the crude oil leaking upward can be discharged through the pressure relief pipe. After the pressure relief work is completed, the screw is rotated along the threaded hole opened in the connecting plate to move the upper support plate and the side support plate downward, and the pressure relief pipe is blocked by the side sealing gasket to prevent the crude oil from continuing to be discharged through the pressure relief pipe and causing waste of crude oil. Personnel can observe through the window, and a high-pressure chamber is formed in the inner cavity formed between the outer shell and the upper support plate as a sealing component to prevent crude oil leakage. As the last sealing structure, it gives personnel time to react and make remedial measures, which is convenient for personnel to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the device of the present invention;

[0020] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0021] Figure 4 for Figure 2 The enlarged structural diagram at B in the middle;

[0022] Figure 5 It is a schematic cross-sectional view of a local structure of the device of the present invention;

[0023] Figure 6 for Figure 5 Enlarged structural diagram at point C in the middle.

[0024] In the figure: 1. The main body of the Christmas tree; 2. The main body of the sealing device; 3. The fixing bolt; 4. The fixing nut;

[0025] 5. Sucker rod; 6. Air pump; 7. Air pipe; 8. Connecting pipe; 9. Pressure relief pipe; 10. Window; 11. Outer shell; 12. Limiting groove; 13. Lower support plate; 14. Lower sealing gasket; 15. Limiting block; 16. Connecting box; 17. Air hole; 18. Connecting rod; 19. Rubber plug; 20. Rotating shaft; 21. Worm gear; 22. Limiting plate; 23. Screw; 24. Connecting plate; 25. Worm; 26. Motor; 27. Side support plate; 28. Connecting block; 29. ​​Support rod; 30. Upper support plate; 31. Mounting groove; 32. Side sealing gasket. DETAILED DESCRIPTION

[0026] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit 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.

[0027] Embodiment 1

[0028] See also Figure 1-Figure 6 The present invention provides a technical solution: a Christmas tree wellhead sealing device for preventing crude oil leakage, comprising: an outer shell 11, an upper support plate 30 is arranged in the outer shell 11, a side sealing gasket 32 ​​and a connecting plate 24 are arranged on the upper support plate 30, and a threaded hole provided on the connecting plate 24 is connected to a screw 23; a sealing device body 2, the sealing device body 2 comprises a lower support plate 13, the lower support plate 13 is arranged in the outer shell 11, a window 10, a pressure relief pipe 9 and an air pump 6 are arranged on the side of the outer shell 11, the air pump 6 is connected to a connecting pipe 8 through an air pipe 7, the connecting pipe 8 is connected to a connecting box 16, and an air hole 17 is opened on the connecting box 16;

[0029] When in use, the sealing device body 2 is installed on the Christmas tree body 1, and the sucker rod 5 is pumped to drive the crude oil to move upward.

[0030] Embodiment 2

[0031] On the basis of the first embodiment, in order to improve the reliability of the device, a Christmas tree well body 1 is provided, on which a sealing device body 2 is installed through fixing bolts 3 and fixing nuts 4, the sealing device body 2 comprises an outer shell 11, a window 10 is provided on the side of the outer shell 11, and the sealing device body 2 is installed on the Christmas tree well body 1 through fixing bolts 3 and fixing nuts 4;

[0032] The connecting pipe 8 is fixedly connected to the air pipe 7, and the other end of the air pipe 7 is fixedly connected to the exhaust end of the air pump 6. The air pump 6 is fixedly installed on the outer shell 11, and the outer shell 11 is fixedly connected with a pressure relief pipe 9, a window 10 and a connecting block 28. The connecting block 28 is an arc-shaped plate-shaped structure, and a support rod 29 is fixedly connected to the connecting block 28. The support rod 29 is a cylindrical structure, and the other end of the support rod 29 is fixedly connected to the lower support plate 13. The air pump 6 inflates the connecting pipe 8 through the air pipe 7, and the gas is opened from the connecting box 16. The air holes 17 are provided to spray out, and a high-pressure air cavity is formed in the cavity formed between the lower support plate 13 and the inner wall of the outer shell 11 and the upper support plate 30, and a sealing structure is formed with the lower sealing gasket 14 fixedly connected to the lower support plate 13, which effectively prevents crude oil leakage. When the crude oil pressure in the main body 1 of the Christmas tree well suddenly increases and exceeds the threshold, the support rod 29 fixedly connected to the connecting block 28 breaks, and the lower support plate 13 and the lower sealing gasket 14 move along the limiting groove 12, and the sealing structure formed is destroyed;

[0033] The rotating shaft 20 is rotatably connected to the outer shell 11, and a worm wheel 21 is fixedly connected to the rotating shaft 20. The worm wheel 21 is meshed with the worm 25 for transmission. The worm 25 is fixedly connected to the transmission shaft of the motor 26. The motor 26 is fixedly installed in the outer shell 11. The pressure relief pipe 9 can be installed in a suitable position to store the sprayed crude oil. The sprayed crude oil will be discharged from the pressure relief pipe 9. After the pressure relief work is completed, the motor 26 drives the worm 25 to rotate, and the worm 25 drives the worm wheel 21 to rotate, so that the rotating shaft 20 rotates;

[0034] The upper support plate 30 is fixedly connected with a connecting plate 24, which is an "L"-shaped plate structure. The threaded hole on the connecting plate 24 is threadedly connected with the screw 23. Both ends of the screw 23 are fixedly connected with the limiting plate 22. The limiting plate 22 is a circular plate structure. The limiting plate 22 located on the upper side is fixedly connected with the rotating shaft 20, and the movement range of the connecting plate 24 is limited by the limiting plate 22. The rotating shaft 20 drives the limiting plate 22 and the screw 23 to rotate, so that the screw 23 rotates along the threaded hole on the connecting plate 24, so that the upper support plate 30 moves downward under the restriction of the side support plate 27.

[0035] A connection box 16 is fixedly connected in the outer shell 11, and the inner cavity of the connection box 16 is communicated with the connection pipe 8, and the connection pipe 8 is fixedly connected to the connection box 16. The other end of the connection pipe 8 extends to the inner cavity formed between the outer shell 11 and the upper support plate 30. A plurality of side support plates 27 are fixedly connected to the upper support plate 30. The side support plates 27 are in an arc-shaped plate-like structure. The side support plates 27 are in contact with the inner side of the outer shell 11. The upper support plate 30 can be supported and restricted by the side support plates 27. When the upper support plate 30 moves downward, the side support plates 27 move downward accordingly. The staff can observe the current status through the window 10, and the staff can deal with it in time according to the situation.

[0036] The upper support plate 30 is a circular plate-shaped structure with a hole in the middle, and the sucker rod 5 can slide along the hole in the middle of the upper support plate 30. A mounting groove 31 is provided on the side of the upper support plate 30, and the mounting groove 31 is an annular groove-shaped structure. A side sealing gasket 32 ​​is arranged in the mounting groove 31, and the side sealing gasket 32 ​​is fixedly connected to the upper support plate 30. The upper support plate 30 and the side sealing gasket 32 ​​form a complete cylindrical structure. The upper support plate 30 moves downward until the side sealing gasket 32 ​​contacts the pressure relief pipe 9, and the side sealing gasket 32 ​​in the mounting groove 31 opened on the side of the upper support plate 30 is blocked to prevent the crude oil from continuing to be discharged through the pressure relief pipe 9, causing waste of crude oil. The air pump 6 supplies air to the connecting pipe 8 through the air pipe 7, and a high-pressure chamber is formed in the inner cavity formed between the outer shell 11 and the upper support plate 30. As a sealing component, it prevents crude oil leakage. As the last sealing structure, it gives personnel reaction time and remedies, which is convenient for personnel to use.

[0037] Embodiment 3

[0038] On the basis of the second embodiment, in order to improve the use effect of the device, a lower support plate 13 is provided. The lower support plate 13 is a circular plate-shaped structure with a hole in the middle, and the sucker rod 5 can slide along the hole in the middle of the lower support plate 13. A lower sealing gasket 14 and a limit block 15 are fixedly connected to the lower support plate 13. The limit block 15 is a square plate-shaped structure, and the limit block 15 can slide along the limit groove 12 opened on the inner side of the outer shell 11. The limit groove 12 is a square groove-shaped structure, and the lower support plate 13 and the limit block 15 can slide along the limit groove 12;

[0039] A connecting rod 18 is fixedly connected to the upper surface of the lower support plate 13. The connecting rod 18 has a cylindrical structure. A rubber plug 19 is fixedly connected to the connecting rod 18. The rubber plug 19 has a cylindrical structure, and the diameter of the rubber plug 19 is equal to the diameter of the connecting rod 18. The connecting rod 18 and the rubber plug 19 can be inserted into the air hole 17 opened on the connecting box 16. The air hole 17 is connected to the inner cavity of the connecting box 16. When the lower support plate 13 and the limiting groove 12 of the limiting block 15 slide, the connecting rod 18 and the rubber plug 19 can be inserted into the air hole 17 opened on the connecting box 16, which can prevent the crude oil at the gushing place from flowing into the connecting box 16 through the air hole 17, thereby improving the use effect of the device.

[0040] In actual use, by the lower sealing gasket 14 fixedly connected to the lower support plate 13, and by filling gas in the cavity formed between the lower support plate 13 and the inner wall of the outer shell 11 and the upper support plate 30 to form a high-pressure air cavity, the crude oil can be effectively prevented from continuing to leak upward from the joint. When the crude oil pressure in the oil production tree well body 1 suddenly rises and exceeds the threshold, the sealing structure is damaged, and the crude oil leaking upward can be discharged through the pressure relief pipe 9. After the pressure relief work is completed, the screw 23 rotates along the threaded hole opened on the connecting plate 24 to move the upper support plate 30 and the side support plate 27 downward, and the pressure relief pipe 9 is blocked by the side sealing gasket 32 ​​to prevent the crude oil from continuing to be discharged through the pressure relief pipe 9 and causing waste of crude oil. Personnel can observe through the window 10, and a high-pressure chamber is formed in the inner cavity formed between the outer shell 11 and the upper support plate 30 as a sealing component to prevent crude oil leakage. As the last sealing structure, it gives personnel time to react and take remedial measures, which is convenient for personnel to use.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A Christmas tree wellhead sealing device for preventing crude oil leakage, comprising: The outer shell (11) is characterized in that an upper support plate (30) is arranged inside the outer shell (11), a side sealing gasket (32) and a connecting plate (24) are arranged on the upper support plate (30), and a threaded hole opened on the connecting plate (24) is connected to the screw rod (23); The sealing device body (2) comprises a lower support plate (13), the lower support plate (13) is arranged in an outer shell (11), a side of the outer shell (11) is provided with a viewing window (10), a pressure relief pipe (9) and an air pump (6), the air pump (6) is connected to a connecting pipe (8) via an air pipe (7), the connecting pipe (8) is connected to a connecting box (16), and an air hole (17) is opened on the connecting box (16).

2. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: The upper support plate (30) is fixedly connected to a connecting plate (24), the connecting plate (24) being an "L"-shaped plate structure, a threaded hole provided on the connecting plate (24) being threadedly connected to a screw rod (23), both ends of the screw rod (23) being fixedly connected to a limiting plate (22), the limiting plate (22) being a circular plate structure, and the limiting plate (22) located on the upper side being fixedly connected to the rotating shaft (20).

3. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: The lower support plate (13) is a circular plate-shaped structure with a hole in the middle, and the sucker rod (5) can slide along the hole in the middle of the lower support plate (13). A lower sealing gasket (14) and a limit block (15) are fixedly connected to the lower support plate (13). The limit block (15) is a square plate-shaped structure, and the limit block (15) can slide along a limit groove (12) provided on the inner side surface of the outer shell (11). The limit groove (12) is a square groove-shaped structure.

4. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: The upper support plate (30) is a circular plate-shaped structure with a hole in the middle. The sucker rod (5) can slide along the hole in the middle of the upper support plate (30). A mounting groove (31) is provided on the side of the upper support plate (30). The mounting groove (31) is an annular groove structure. A side sealing gasket (32) is arranged in the mounting groove (31). The side sealing gasket (32) is fixedly connected to the upper support plate (30). The upper support plate (30) and the side sealing gasket (32) form a complete cylindrical structure.

5. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: A sealing device body (2) is mounted on the Christmas tree well body (1) via fixing bolts (3) and fixing nuts (4); the sealing device body (2) comprises an outer shell (11), and a viewing window (10) is arranged on the side of the outer shell (11).

6. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: The upper surface of the lower support plate (13) is fixedly connected with a connecting rod (18), the connecting rod (18) is in a cylindrical structure, and a rubber plug (19) is fixedly connected to the connecting rod (18), the rubber plug (19) is in a cylindrical structure, and the diameter of the rubber plug (19) is equal to the diameter of the connecting rod (18), the connecting rod (18) and the rubber plug (19) can be inserted into the air hole (17) provided on the connecting box (16), and the air hole (17) is connected with the inner cavity of the connecting box (16).

7. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: A connection box (16) is fixedly connected inside the outer shell (11); the inner cavity of the connection box (16) is communicated with the connection pipe (8); the connection pipe (8) is fixedly connected to the connection box (16); the other end of the connection pipe (8) extends into an inner cavity formed between the outer shell (11) and an upper support plate (30); a plurality of side support plates (27) are fixedly connected to the upper support plate (30); the side support plates (27) are in an arc-shaped plate structure; and the side support plates (27) are in contact with the inner side surface of the outer shell (11).

8. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 1, characterized in that: The connecting pipe (8) is fixedly connected to the air pipe (7), the other end of the air pipe (7) is fixedly connected to the exhaust end of the air pump (6), the air pump (6) is fixedly mounted on the outer shell (11), the outer shell (11) is fixedly connected with a pressure relief pipe (9), a viewing window (10) and a connecting block (28), the connecting block (28) is an arc-shaped plate-shaped structure, the connecting block (28) is fixedly connected with a support rod (29), the support rod (29) is a cylindrical structure, and the other end of the support rod (29) is fixedly connected to the lower support plate (13).

9. The Christmas tree wellhead sealing device for preventing crude oil leakage according to claim 2, characterized in that: The rotating shaft (20) is rotatably connected to the outer shell (11), and a worm wheel (21) is fixedly connected to the rotating shaft (20), the worm wheel (21) is meshed with a worm (25) for transmission, the worm (25) is fixedly connected to a transmission shaft of a motor (26), and the motor (26) is fixedly installed in the outer shell (11).

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