Plugging structure for testing oil gas in oil field

Abstract

The utility model discloses a plugging structure for testing oil gas in an oil field, which relates to the field of plugging pressure relief devices and comprises a plugging cover, an outer connecting ring protruding outwards is integrally formed at the bottom of the periphery of the plugging cover, the outer connecting ring is connected with a wellhead through a ground bolt, and a piston mechanism is connected to the inner wall of the plugging cover. A piston mechanism is mounted at the top of the outer connecting ring, a driving mechanism is mounted at the top of the outer connecting ring and used for limiting the maximum upward moving distance of the piston mechanism, a sliding pipe protruding upwards is integrally formed at the top of the plugging cover, and the piston mechanism penetrates through an inner cavity of the plugging cover to an inner cavity of the sliding pipe and extends out of the sliding pipe; the piston mechanism is connected with the driving mechanism in a sliding mode. By arranging the driving mechanism, the opening degree of the piston mechanism can be actively controlled, or the opening of the piston mechanism can be directly limited, so that convenience is provided for replacing the buffer tank.

Description

Technical Field

[0001] The utility model relates to the field of plugging and pressure relief devices, in particular to a plugging structure for oil and gas testing in oil fields. Background Art

[0002] The wellhead plugging structure is a device for plugging the wellhead. This device is generally a temporary plugging device. After the packer is connected to the wellhead, there is generally no need to use the temporary plugging device of the wellhead.

[0003] During the use of the temporary plugging device, a passive piston mechanism is generally set up in the plugging cover, which can passively release the air pressure as the air pressure in the well changes. However, this method makes it impossible for the staff to actively control it. When replacing the cache tank, the air in the well will be directly discharged to the outside, affecting the outside air quality. Utility Model Content

[0004] The purpose of the utility model is to provide a plugging structure for oil and gas testing in an oil field in order to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a plugging structure for oil field oil and gas testing, comprising a plugging cover, the outer peripheral bottom of the plugging cover is integrally formed with an outer connecting ring protruding outward, the outer connecting ring is connected to the wellhead through a ground bolt, the inner wall of the plugging cover is connected with a piston mechanism, the top of the outer connecting ring is installed with an active mechanism, the active mechanism is used to limit the maximum distance of the upward movement of the piston mechanism, the top of the plugging cover is integrally formed with a sliding tube protruding upward, the piston mechanism penetrates from the inner cavity of the plugging cover to the inner cavity of the sliding tube, and extends to the outside of the sliding tube;

[0006] The piston mechanism is slidably connected to the active mechanism.

[0007] As a further solution of the utility model: the active mechanism includes a screw rod rotatably connected to the top of the blocking cover and a sliding rod fixedly connected to the top of the blocking cover, the outer wall of the screw rod is threadedly connected to a limit plate No. 1, the limit plate No. 1 is slidably connected to the sliding rod, the top of the sliding rod is fixedly connected to an upper fixed plate, and the upper fixed plate is rotatably connected to the screw rod.

[0008] As a further solution of the utility model: the active mechanism also includes a worm wheel coaxially connected to the top of the screw, a worm is meshed on the outer periphery of the worm wheel, and the output end of the forward and reverse motor is connected to one end of the worm.

[0009] As a further solution of the utility model: the piston mechanism includes a piston plate which is slidably connected to the inner wall of the blocking cover up and down, the top of the piston plate is integrally formed with a connecting rod which penetrates into the inner cavity of the sliding tube, the top of the connecting rod is fixedly connected to a second limit plate which is slidably connected to the inner wall of the sliding tube up and down, and the top of the second limit plate is connected to the top of the inner cavity of the sliding tube by a spring.

[0010] As a further solution of the utility model: the piston mechanism also includes a vertical rod fixedly installed at the top center position of the second limit plate, the vertical rod penetrates to the top of the sliding tube, and a pressure plate is fixedly installed on the top of the vertical rod, and the pressure plate is connected to the sliding rod for up and down sliding.

[0011] As a further solution of the utility model: the inner wall of the sliding tube and the outer wall of the second limiting plate are both polygonal structures, and the inner wall of the sliding tube is consistent with the inner wall of the second limiting plate.

[0012] As a further solution of the utility model: the inner wall of the blocking cover is located below the piston plate and is fixedly connected with a lower limit ring, and the bottom end of the lower limit ring is formed with an inclined surface.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By setting an active mechanism, it is possible to actively control the opening degree of the piston mechanism, or directly limit the opening of the piston mechanism, thereby providing convenience for replacing the cache tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 For the utility model Figure 2 A partial enlarged view of point A in the middle.

[0018] In the figure: 1. Sealing cover; 2. External connecting ring; 3. Ground bolt; 4. Discharge pipe; 5. Sliding pipe; 6. Sliding rod; 7. Screw; 8. Upper fixing plate; 9. No. 1 limit plate; 10. Pressure plate; 11. Lower limit ring; 12. Piston plate; 13. Connecting rod; 14. No. 2 limit plate; 15. Spring; 16. Vertical rod; 17. Worm gear; 18. Worm; 19. Forward and reverse motor. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 to Figure 3 In an embodiment of the utility model, a plugging structure for oil and gas testing in an oil field comprises a plugging cover 1, an outer connecting ring 2 protruding outward is integrally formed at the outer peripheral bottom of the plugging cover 1, the outer connecting ring 2 is connected to the wellhead through a ground bolt 3, a piston mechanism is connected to the inner wall of the plugging cover 1, an active mechanism is installed on the top of the outer connecting ring 2, the active mechanism is used to limit the maximum upward distance of the piston mechanism, a sliding tube 5 protruding upward is integrally formed on the top of the plugging cover 1, the piston mechanism penetrates from the inner cavity of the plugging cover 1 to the inner cavity of the sliding tube 5, and extends to the outside of the sliding tube 5; the piston mechanism is slidably connected to the active mechanism.

[0021] In this embodiment: when the active mechanism is at the highest position and the piston mechanism cannot be limited, when the internal pressure of the oil well is greater than the external pressure, the pressure acts on the piston mechanism, and the piston mechanism is forced to move upward. The upward moving piston mechanism places the port of the discharge pipe 4 below the moved piston mechanism, and the pressure can be released through the discharge pipe 4 at this time;

[0022] It should be noted that the discharge pipe 4 is connected to the sealed buffer tank through a pipeline to transport the gas in the oil well to the buffer tank, and a one-way valve for output is installed in the discharge pipe 4, that is, the gas in the buffer tank cannot enter the blocking cover 1 again;

[0023] When the movement of the piston mechanism needs to be restricted, the active mechanism is started, and the active mechanism restricts the movement of the piston mechanism or the maximum upward movement distance of the piston mechanism, thereby achieving the purpose of actively controlling the movement of the piston mechanism.

[0024] Please refer to Figure 2 and Figure 3 The active mechanism includes a screw rod 7 rotatably connected to the top of the blocking cover 1 and a sliding rod 6 fixedly connected to the top of the blocking cover 1. The outer wall of the screw rod 7 is threadedly connected to a No. 1 limit plate 9, and the No. 1 limit plate 9 is slidably connected to the sliding rod 6. The top of the sliding rod 6 is fixedly connected to an upper fixed plate 8, and the upper fixed plate 8 is rotatably connected to the screw 7. The active mechanism also includes a worm gear 17 coaxially connected to the top of the screw 7, and a worm 18 is meshed on the outer periphery of the worm gear 17. The output end of the forward and reverse motor 19 is connected to one end of the worm 18.

[0025] In this embodiment: By starting the forward and reverse motor 19, the operation of the forward and reverse motor 19 drives the worm 18 to rotate. The rotating worm 18 drives the worm wheel 17 to rotate, and the worm wheel 17 can drive the screw rod 7 to rotate. The rotating screw rod 7 drives the first limit plate 9 to move up and down;

[0026] The position where the first limit plate 9 is located is the maximum distance that the piston mechanism can reach. When the first limit plate 9 is located on top of the pressure receiving plate 10 in the initial state, the piston mechanism cannot move upward at this time.

[0027] Please refer specifically to Figure 2 , the piston mechanism includes a piston plate 12 that is slidably connected up and down to the inner wall of the sealing cover 1. A connecting rod 13 that penetrates into the inner cavity of the sliding tube 5 is integrally formed at the top of the piston plate 12. A second limit plate 14 that is slidably connected up and down to the inner wall of the sliding tube 5 is fixedly connected to the top of the connecting rod 13. A spring 15 is connected between the top of the second limit plate 14 and the top end of the inner cavity of the sliding tube 5. The piston mechanism further includes a vertical rod 16 fixedly installed at the center position of the top of the second limit plate 14. The vertical rod 16 penetrates above the sliding tube 5, and a pressure receiving plate 10 is fixedly installed at the top of the vertical rod 16. The pressure receiving plate 10 is slidably connected up and down with the sliding rod 6.

[0028] In this embodiment: When the gas in the well acts on the piston plate 12, the piston plate 12 moves upward. The piston plate 12 drives the connecting rod 13 to move upward. The connecting rod 13 pushes the second limit plate 14 to move upward. The second limit plate 14 moves upward along the inner wall of the sliding tube 5. At this time, the spring 15 is compressed. At the same time, the second limit plate 14 drives the vertical rod 16 to move upward. The vertical rod 16 drives the pressure receiving plate 10 to move upward along the outer wall of the sliding rod 6 until the pressure receiving plate 10 contacts the bottom end of the first limit plate 9;

[0029] If the first limit plate 9 is located on the top plate of the pressure receiving plate 10 in the initial position, the pressure receiving plate 10 cannot move upward.

[0030] Please refer specifically to Figure 2 , both the inner wall of the sliding tube 5 and the outer wall of the second limit plate 14 are of a polygonal structure, and the inner wall of the sliding tube 5 and the inner wall of the second limit plate 14 are in conformity with each other.

[0031] In this embodiment: The cooperation between the second limit plate 14 and the sliding tube 5 restricts the rotation of the piston plate 12.

[0032] Please refer specifically to Figure 2 , a lower limit ring 11 is fixedly connected to the inner wall of the sealing cover 1 below the piston plate 12. An inclined surface is formed at the bottom end of the lower limit ring 11.

[0033] In this embodiment: the lower limit ring 11 limits the lowest position to which the piston plate 12 can move, and the inclined surface can play a guiding role to reduce the resistance of the gas in the well during movement.

[0034] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plugging structure for oil and gas testing in an oil field, comprising a plugging cover (1), wherein the outer peripheral bottom of the plugging cover (1) is integrally formed with an outer connecting ring (2) protruding outward, and the outer connecting ring (2) is connected to the wellhead through a ground bolt (3), characterized in that: The inner wall of the blocking cover (1) is connected to a piston mechanism, the top of the outer connecting ring (2) is equipped with an active mechanism, the active mechanism is used to limit the maximum upward movement distance of the piston mechanism, the top of the blocking cover (1) is integrally formed with a sliding tube (5) protruding upward, the piston mechanism passes through the inner cavity of the blocking cover (1) to the inner cavity of the sliding tube (5), and extends to the outside of the sliding tube (5); The piston mechanism is slidably connected to the active mechanism.

2. A plugging structure for oil and gas testing in an oil field according to claim 1, characterized in that: The active mechanism comprises a screw rod (7) rotatably connected to the top of the blocking cover (1) and a sliding rod (6) fixedly connected to the top of the blocking cover (1); the outer wall of the screw rod (7) is threadedly connected to a first limit plate (9); the first limit plate (9) is slidably connected to the sliding rod (6); the top of the sliding rod (6) is fixedly connected to an upper fixed plate (8); and the upper fixed plate (8) is rotatably connected to the screw rod (7).

3. A plugging structure for oil and gas testing in an oil field according to claim 2, characterized in that: The active mechanism also includes a worm wheel (17) coaxially connected to the top of the screw (7), a worm (18) is meshed on the outer periphery of the worm wheel (17), and the output end of the forward and reverse motor (19) is connected to one end of the worm (18).

4. A plugging structure for oil and gas testing in an oil field according to claim 3, characterized in that: The piston mechanism comprises a piston plate (12) connected to the inner wall of the blocking cover (1) in an up-and-down sliding manner, the top of the piston plate (12) is integrally formed with a connecting rod (13) penetrating into the inner cavity of the sliding tube (5), the top of the connecting rod (13) is fixedly connected to a second limit plate (14) connected to the inner wall of the sliding tube (5) in an up-and-down sliding manner, and the top of the second limit plate (14) is connected to the top of the inner cavity of the sliding tube (5) by a spring (15).

5. A plugging structure for oil and gas testing in an oil field according to claim 4, characterized in that: The piston mechanism also includes a vertical rod (16) fixedly mounted at the top center position of the second limit plate (14), the vertical rod (16) extending to the top of the sliding tube (5), a pressure plate (10) fixedly mounted on the top of the vertical rod (16), and the pressure plate (10) is connected to the sliding rod (6) in an up-and-down sliding manner.

6. A plugging structure for oil and gas testing in an oil field according to claim 5, characterized in that: The inner wall of the sliding tube (5) and the outer wall of the second limiting plate (14) both have a polygonal structure, and the inner wall of the sliding tube (5) matches the inner wall of the second limiting plate (14).

7. A plugging structure for oil and gas testing in an oil field according to claim 4, characterized in that: The inner wall of the blocking cover (1) is located below the piston plate (12) and is fixedly connected to a lower limiting ring (11), and the bottom end of the lower limiting ring (11) is formed with an inclined surface.

Images