A plugging device for gas wellhead

Abstract

The utility model relates to the technical field related to gas wellhead plugging, specifically a plugging device for a gas wellhead, comprising a pre-buried cement cylinder, a packaging flange, a built-in packaging plate and a sealing component, wherein a packaging flange is installed at a fixed position on the pre-buried cement cylinder, a built-in packaging plate is arranged at a communicating position on the packaging flange, a packaging flange is connected at a fixed position on the sealing component, and an upper plugging component is arranged on the built-in packaging plate; a lower plugging component is arranged on the built-in packaging plate. In the utility model, a solid cylinder is lifted and sealed with a sealing ring cylinder and a wellhead plate, so that the wellhead cylinder, the sealing ring cylinder and the wellhead plate can be plugged. The wellhead cylinder can be externally plugged separately, and the sealing ring cylinder and the wellhead plate can be internally plugged. When plugging the gas wellhead, the wellhead is sealed, and at the same time, the sealing ring cylinder and the wellhead plate are internally plugged to avoid a large amount of gas from gathering at the gas wellhead pipe, so as to prevent the wellhead cylinder from leaking and causing a gas explosion.

Description

Technical Field

[0001] The utility model relates to the technical field related to gas wellhead plugging, in particular to a plugging device for a gas wellhead. Background Art

[0002] Gas wellhead plugging is divided into two types: brick wall plugging and block plugging, which are suitable for large and medium-sized pipelines of various shapes. Usually, short pipes need to be pre-buried for temporary drainage. After the strength of the brick wall reaches the requirement, the short pipes are plugged with wooden plugs or air bags. Before dismantling the brick wall, the reserved short pipes need to be opened for temporary plugging to lower the upstream water level. When building walls underwater, clay needs to be added to the mortar to prevent the mortar from being washed away by water.

[0003] The existing gas wellhead plugging can only seal the wellhead, causing a large amount of gas to gather at the gas wellhead pipe. Once leaked, it will cause a gas explosion. Therefore, there is a lack of a plugging structure at the connection between the gas wellhead and the buried pipeline, causing the gas to gather at the gas wellhead after plugging. Utility Model Content

[0004] The purpose of the utility model is to provide a plugging device for a gas wellhead to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A plugging device for a gas wellhead comprises a pre-buried cement cylinder, a packaging flange, a built-in packaging plate and a sealing assembly, wherein the fixed part of the pre-buried cement cylinder is provided with a packaging flange, the connected part of the packaging flange is provided with a built-in packaging plate, the fixed part of the sealing assembly is connected with the packaging flange, and further comprises:

[0007] An upper plugging assembly, mounted on the built-in packaging board;

[0008] A lower plugging assembly, arranged on the built-in packaging plate;

[0009] Among them, a sealing cylinder is fixedly connected to the top of the built-in packaging plate, a solid cylinder is movably installed inside the sealing cylinder, lifting rods are fixedly connected on both sides of the solid cylinder, a wellhead plate is provided at the movable part of the lifting rod, hydraulic cylinders are installed on both sides of the top of the wellhead plate, a wellhead cylinder is fixedly installed on the inner side of the hydraulic cylinder, and the wellhead cylinder is communicated with the wellhead plate.

[0010] The plugging device for a gas wellhead as described above: the built-in packaging plate is connected to the wellhead plate through a plugging tube, and the wellhead tube is connected to the plugging tube through the wellhead plate.

[0011] The plugging device for a gas wellhead as described above: the lifting rod drives the solid tube to rise and fall through the hydraulic cylinder, and the solid tube rises and falls to seal inside the wellhead plate.

[0012] The plugging device for a gas wellhead as described above: the upper plugging assembly includes a sealing ring tube fixedly connected to the wellhead plate, and perforated covers are provided on both sides of the sealing ring tube, and the inside of the perforated cover can be raised and lowered to pass through a lifting rod.

[0013] The plugging device for a gas wellhead as described above: the sealing ring tube is sealed on the wellhead plate through a solid tube.

[0014] The plugging device for a gas wellhead as described above: the lower plugging assembly includes a plugging wellhead plate fixedly mounted on a built-in packaging plate, and a built-in wellhead is opened in the middle of the plugging wellhead plate.

[0015] The plugging device for a gas production wellhead as described above: the built-in wellhead is plugged at the bottom of the solid cylinder by a plugging wellhead plate.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the solid tube is lifted to seal the sealing ring tube and the wellhead plate, and the wellhead tube, the sealing ring tube and the wellhead plate can be sealed. The wellhead tube can be sealed externally alone, and the sealing ring tube and the wellhead plate can be sealed internally. The gas production wellhead is sealed at the same time, and the sealing ring tube and the wellhead plate are sealed internally to avoid a large amount of gas from gathering at the gas production wellhead pipe, thereby preventing gas explosion caused by leakage of the wellhead tube.

[0017] The lifting rod drives the solid cylinder in the sealing cylinder between the built-in packaging plate and the wellhead plate. The solid cylinder can be hydraulically lowered to the inside of the built-in wellhead, and gas can be sealed inside the sealing wellhead plate, the built-in packaging plate and the packaging flange. By hydraulically lowering the solid cylinder to the inside of the built-in wellhead, the connection between the gas wellhead and the buried pipeline can be pre-buried and sealed to prevent gas from gathering at the pre-buried part of the gas wellhead after sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the upper plugging component of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the lower plugging component of the utility model.

[0021] In the figure: 1. embedded cement cylinder; 2. packaging flange; 3. built-in packaging plate; 4. lifting rod; 5. solid cylinder; 6. wellhead plate; 7. hydraulic cylinder; 8. wellhead cylinder; 9. plugging cylinder; 10. sealing ring cylinder; 11. perforated cover; 12. built-in wellhead; 13. plugging wellhead plate. DETAILED DESCRIPTION

[0022] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0023] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0024] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0025] See also Figures 1 to 3 A plugging device for a gas wellhead is proposed, comprising a pre-buried cement cylinder 1, a packaging flange 2, a built-in packaging plate 3 and a sealing component.

[0026] A packaging flange 2 is installed at a fixed position on the embedded cement cylinder 1, a built-in packaging plate 3 is provided at a connected position on the packaging flange 2, a fixed position on the sealing component is connected to the packaging flange 2, an upper plugging component is installed on the built-in packaging plate 3; a lower plugging component is provided on the built-in packaging plate 3;

[0027] The pre-buried cement cylinder 1 is pre-buried at the gas wellhead, and then the packaging flange 2 and the built-in packaging plate 3 are fixedly connected to the top of the pre-buried cement cylinder 1, so that the pre-buried cement cylinder 1 can be sealed and connected;

[0028] Among them, a sealing cylinder 9 is fixedly connected to the top of the built-in packaging plate 3, a solid cylinder 5 is movably installed inside the sealing cylinder 9, lifting rods 4 are fixedly connected on both sides of the solid cylinder 5, a wellhead plate 6 is provided at the movable part of the lifting rod 4, hydraulic cylinders 7 are installed on both sides of the top of the wellhead plate 6, a wellhead cylinder 8 is fixedly installed on the inside of the hydraulic cylinder 7, and the wellhead cylinder 8 is communicated with the wellhead plate 6.

[0029] In this embodiment, the sealing tube 9 is fixedly connected to the packaging flange 2 and the built-in packaging plate 3, so that the wellhead plate 6 is connected to the sealing tube 9, and the hydraulic cylinder 7 is movably installed on the wellhead tube 8 and the wellhead plate 6. Starting the hydraulic cylinder 7 can push the lifting rod 4 on the wellhead plate 6 to lift and lower. The lifting rod 4 can drive the solid tube 5 to lift and lower in the sealing tube 9 between the built-in packaging plate 3 and the wellhead plate 6. The solid tube 5 is hydraulically sealed between the built-in packaging plate 3 and the wellhead plate 6, and internal sealing is performed according to the needs of the gas wellhead to prevent gas from gathering at the gas wellhead.

[0030] Preferably, the built-in packaging plate 3 is connected to the wellhead plate 6 through the sealing tube 9, and the wellhead tube 8 is connected to the sealing tube 9 through the wellhead plate 6. The sealing tube 9 and the wellhead plate 6 are connected and sealed on the built-in packaging plate 3 to perform a built-in sealing connection, which is convenient for the solid tube 5 to be raised and lowered for sealing.

[0031] Preferably, the lifting rod 4 drives the solid tube 5 to rise and fall through the hydraulic cylinder 7, and the solid tube 5 is lifted and lowered to be sealed inside the wellhead plate 6. Relying on the hydraulic power of the hydraulic cylinder 7, the solid tube 5 can be lifted and lowered to be sealed inside the sealing tube 9 and the wellhead plate 6.

[0032] Please refer to Figure 1 and Figure 2 In this embodiment, the upper plugging assembly includes a sealing ring tube 10 fixedly connected to the wellhead plate 6, and perforated covers 11 are opened on both sides of the sealing ring tube 10. The inside of the perforated cover 11 can be raised and lowered to pass through the lifting rod 4.

[0033] The sealing ring tube 10 is fixedly connected to the wellhead plate 6. The perforated cover 11 on the sealing ring tube 10 is used for lifting the lifting rod 4. The solid tube 5 on the lifting rod 4 is lifted to the sealing ring tube 10 for sealing.

[0034] Preferably, the sealing ring tube 10 is sealed on the wellhead plate 6 through the solid tube 5. When the hydraulic cylinder 7 is started, the lifting rod 4 on the wellhead plate 6 can be pushed to lift and lower. The lifting rod 4 can drive the solid tube 5 in the sealing tube 9 between the built-in packaging plate 3 and the wellhead plate 6 to lift and lower and seal. The solid tube 5 is lifted and sealed on the sealing ring tube 10 and the wellhead plate 6. The wellhead tube 8, the sealing ring tube 10 and the wellhead plate 6 can be sealed. The wellhead tube 8 can be sealed externally alone, and the sealing ring tube 10 and the wellhead plate 6 can be sealed internally. The gas production wellhead is sealed at the same time, and the sealing ring tube 10 and the wellhead plate 6 are internally sealed to avoid a large amount of gas from gathering at the gas production wellhead pipe, thereby preventing the wellhead tube 8 from leaking and causing a gas explosion.

[0035] Please refer to Figure 1 and Figure 3 In this embodiment, the lower plugging assembly includes a plugging wellhead plate 13 fixedly mounted on the built-in packaging plate 3 , and a built-in wellhead 12 is opened in the middle of the plugging wellhead plate 13 .

[0036] The plugging wellhead plate 13 is fixedly connected to the built-in packaging plate 3 and the packaging flange 2, so that the built-in wellhead 12 is opened on the plugging wellhead plate 13, the built-in packaging plate 3 and the packaging flange 2 for plugging.

[0037] Preferably, the built-in wellhead 12 is blocked at the bottom of the solid cylinder 5 by a blocking wellhead plate 13. Starting the hydraulic cylinder 7 can push the lifting rod 4 on the wellhead plate 6. When lifting, the lifting rod 4 drives the solid cylinder 5 in the blocking cylinder 9 between the built-in packaging plate 3 and the wellhead plate 6. The solid cylinder 5 can be hydraulically lowered to the inside of the built-in wellhead 12, and gas can be blocked inside the wellhead plate 13, the built-in packaging plate 3 and the packaging flange 2.

[0038] As can be seen from the above, the hydraulic cylinder 7 is movably installed on the wellhead tube 8 and the wellhead plate 6. Starting the hydraulic cylinder 7 can push the lifting rod 4 on the wellhead plate 6 to lift and lower. The lifting rod 4 can drive the solid tube 5 to lift and lower and seal in the sealing tube 9 between the built-in packaging plate 3 and the wellhead plate 6. The hydraulic cylinder 7 can push the lifting rod 4 on the wellhead plate 6. When lifting and lowering, the lifting rod 4 drives the solid tube 5 in the sealing tube 9 between the built-in packaging plate 3 and the wellhead plate 6. The solid tube 5 can be hydraulically lowered to the inside of the built-in wellhead 12.

[0039] The solid tube 5 is raised and lowered to seal the sealing ring tube 10 and the wellhead plate 6, so as to seal the wellhead tube 8, the sealing ring tube 10 and the wellhead plate 6. The wellhead tube 8 can be sealed externally alone, and the sealing ring tube 10 and the wellhead plate 6 can be sealed internally.

[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A plugging device for a gas wellhead, comprising a pre-buried cement cylinder (1), a packaging flange (2), a built-in packaging plate (3) and a sealing assembly, wherein the packaging flange (2) is installed at a fixed position on the pre-buried cement cylinder (1), the built-in packaging plate (3) is provided at a connected position on the packaging flange (2), and the packaging flange (2) is connected to a fixed position on the sealing assembly, characterized in that: It also includes the following: An upper plugging assembly, mounted on the built-in packaging plate (3); A lower plugging component, arranged on the built-in packaging plate (3); The top of the built-in packaging plate (3) is fixedly connected to a plugging cylinder (9), a solid cylinder (5) is movably installed inside the plugging cylinder (9), lifting rods (4) are fixedly connected to both sides of the solid cylinder (5), a wellhead plate (6) is arranged at the movable part of the lifting rod (4), hydraulic cylinders (7) are installed on both sides of the top of the wellhead plate (6), a wellhead cylinder (8) is fixedly installed inside the hydraulic cylinder (7), and the wellhead cylinder (8) is communicated with the wellhead plate (6).

2. A plugging device for a gas wellhead according to claim 1, characterized in that: The built-in packaging plate (3) is connected to the wellhead plate (6) via a plugging tube (9), and the wellhead tube (8) is connected to the plugging tube (9) via the wellhead plate (6).

3. A plugging device for a gas wellhead according to claim 1, characterized in that: The lifting rod (4) is driven by a hydraulic cylinder (7) to lift the solid cylinder (5), and the solid cylinder (5) is lifted and sealed inside the wellhead plate (6).

4. A plugging device for a gas wellhead according to claim 1, characterized in that: The upper plugging assembly comprises a sealing ring cylinder (10) fixedly connected to a wellhead plate (6), and perforated covers (11) are provided on both sides of the sealing ring cylinder (10). The interior of the perforated cover (11) can be raised and lowered to pass through a lifting rod (4).

5. A plugging device for a gas wellhead according to claim 4, characterized in that: The sealing ring cylinder (10) is sealed on the wellhead plate (6) through the solid cylinder (5).

6. A plugging device for a gas wellhead according to claim 1, characterized in that: The lower plugging assembly comprises a plugging wellhead plate (13) fixedly mounted on the built-in packaging plate (3), and a built-in wellhead (12) is provided in the middle of the plugging wellhead plate (13).

7. A plugging device for a gas wellhead according to claim 6, characterized in that: The built-in wellhead (12) is sealed at the bottom of the solid cylinder (5) by means of a sealing wellhead plate (13).

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