A valve dismounting and blocking device for natural gas wellhead equipment

Abstract

The utility model relates to natural gas wellhead equipment technical field discloses a valve dismounting and blocking and taking and sending device for natural gas wellhead equipment, including taking and sending body, connecting sleeve and valve dismounting and blocking, the connecting end of connecting sleeve with taking and sending body fixed connection, the cooperation end of connecting sleeve sets up hexagonal hole, and the center coaxial setting cylinder hole in hexagonal hole, the cooperation end of valve dismounting and blocking sets up the hexagonal cylinder surface that cooperates with hexagonal hole, and in the center coaxial setting cylinder section that cooperates with cylinder hole in hexagonal cylinder surface. The utility model can make valve dismounting and blocking and taking and sending device after valve dismounting and blocking inserts connecting sleeve obvious drop, has guaranteed that valve dismounting and blocking one -time sending in -situ success.

Description

Technical Field

[0001] This utility model relates to the field of natural gas wellhead equipment technology, specifically to a valve disassembly and plug removal device for natural gas wellhead equipment. Background Technology

[0002] Natural gas wellhead equipment is designed and manufactured according to GB / T22513 or API 6A. The casing head and tubing head four-way valves of the wellhead equipment are designed with threaded valve disassembly plugs. Each side outlet typically has 1-2 gate valves connected externally. The wellhead equipment is installed at the natural gas wellhead. If the side outlet gate valve needs to be removed later due to gate valve failure or other reasons, a valve disassembly plug delivery device is used to pressurize and insert the valve disassembly plug into the threaded area of ​​the valve disassembly plug on the natural gas wellhead equipment body for screwing and tightening. This seals off the natural gas in the wellhead, allowing for subsequent gate valve removal and replacement operations.

[0003] Standard valve disassembly plugs have standard dimensions, such as... Figure 1 , Figure 2 and Figure 3 As shown, the valve disassembly plug connects to the valve disassembly plug delivery device via a hexagonal cylindrical surface. Due to the large tolerances in the design and manufacturing of the hexagonal cylindrical surface and its fixed length, the clearance is significant after connecting to the inner hexagonal hole of the connecting sleeve of the valve disassembly plug delivery device. During horizontal tool advancement, the valve disassembly plug at the front end is prone to tilting downwards, becoming misaligned with the central rod of the valve disassembly plug delivery device. When it reaches the threaded section of the casing head body and tubing head four-way valve at the natural gas wellhead equipment, where the valve disassembly plug is designed, it becomes difficult to smoothly insert into the prepared inner thread. Multiple repeated extractions and insertions are required, causing time delays. Removing the side gate valve from natural gas wellhead equipment is often an emergency operation performed when the gate valve fails (sealing failure, valve body puncture, etc.), making time and success extremely valuable. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a valve disassembly plug delivery and retrieval device for natural gas wellhead equipment. Through innovative structural design of the valve disassembly plug and its connecting sleeve, it solves the problem of the valve disassembly plug sagging during insertion, misalignment with the central rod of the delivery and retrieval device, and difficulty in smoothly inserting into the wellhead equipment's side outlet threaded hole. The improved valve disassembly plug delivery and retrieval device of this invention exhibits no significant sagging after the valve disassembly plug is inserted into the connecting sleeve, ensuring successful insertion in one go.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A valve disassembly plug delivery device for natural gas wellhead equipment includes a delivery body, a connecting sleeve, and a valve disassembly plug; the connecting end of the connecting sleeve is fixedly connected to the delivery body; the mating end of the connecting sleeve is provided with a hexagonal hole, and a cylindrical hole is coaxially provided at the center of the hexagonal hole; the mating end of the valve disassembly plug is provided with a hexagonal cylindrical surface that mates with the hexagonal hole, and a cylindrical section that mates with the cylindrical hole is coaxially provided at the center of the hexagonal cylindrical surface.

[0007] In some embodiments, the cylindrical section of the valve disassembly plug is provided with a length of 1.5 times its diameter.

[0008] In some embodiments, the cylindrical hole of the connecting sleeve is provided with a chamfered conical hole.

[0009] In some embodiments, a positioning cone surface is provided at the rear end of the cylindrical section of the valve disassembly plug.

[0010] In some embodiments, the positioning cone surface of the cylindrical section of the valve disassembly plug is set at an angle of 45°.

[0011] In some embodiments, the front end of the cylindrical section of the valve disassembly plug is provided with an inlet cone surface.

[0012] In some embodiments, the guide cone surface of the cylindrical section of the valve disassembly plug is set at an angle of 25° to 30°.

[0013] In some embodiments, the cylindrical hole of the connecting sleeve is provided with an air pressure hole that communicates with the outside.

[0014] This utility model has the following beneficial effects:

[0015] This utility model solves the problem of the valve disassembly plug sagging at the front end during the insertion process, which causes it to be out of axis with the central rod of the valve disassembly plug delivery device and difficult to smoothly enter the wellhead device side outlet threaded hole. This is achieved through an innovative structural design of the valve disassembly plug and its connecting sleeve. As a result, the valve disassembly plug delivery device does not sag significantly after the valve disassembly plug is inserted into the connecting sleeve, ensuring that the valve disassembly plug is successfully inserted into place in one go. Attached Figure Description

[0016] Figure 1 A schematic diagram of the existing valve disassembly and plug removal / delivery device;

[0017] Figure 2 A front view of the existing valve disassembly plug;

[0018] Figure 3 A cross-sectional view of the existing valve plug.

[0019] Figure 4 This is a schematic diagram of the structure of the valve disassembly and plug removal device of this utility model;

[0020] Figure 5 This is a front view of the valve disassembly plug in this utility model;

[0021] Figure 6 This is a cross-sectional view of the valve disassembly plug in this utility model.

[0022] The attached diagram is labeled as follows: 1-valve disassembly plug, 11-hexagonal cylindrical surface, 12-cylindrical section, 13-positioning conical surface, 14-introducing conical surface, 2-connecting sleeve, 21-hexagonal hole, 22-cylindrical hole, 23-chamfered conical hole, 24-air pressure hole, 3-pickup and delivery body, 31-center rod. Detailed Implementation

[0023] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All inventions utilizing the concept of this invention are protected.

[0024] like Figure 4 , Figure 5 and Figure 6 As shown in the figure, an embodiment of the present invention provides a valve disassembly plug delivery device for natural gas wellhead equipment, including a delivery body 3, a connecting sleeve 2, and a valve disassembly plug 1; the connecting end of the connecting sleeve 2 is fixedly connected to the delivery body 3; the mating end of the connecting sleeve 2 is provided with a hexagonal hole 21, and a cylindrical hole 22 is coaxially provided at the center of the hexagonal hole 21; the mating end of the valve disassembly plug 1 is provided with a hexagonal cylindrical surface 11 that mates with the hexagonal hole 21, and a cylindrical segment 12 that mates with the cylindrical hole 22 is coaxially provided at the center of the hexagonal cylindrical surface 11.

[0025] This embodiment, without altering the existing threads and hexagonal cylindrical surface 11 of the valve disassembly plug 1, adds a cylindrical section 12 structure to the front end of the hexagonal cylindrical surface 11 of the valve disassembly plug 1, and simultaneously adds a cylindrical hole 22 inside the hexagonal hole 21 of the connecting sleeve 2. When the valve disassembly plug 1 is inserted into the connecting sleeve 2, the cylindrical section 12 of the valve disassembly plug 1 and the cylindrical hole 22 of the connecting sleeve 2 can be coaxially clearance-fitted, thereby ensuring that the valve disassembly plug 1 is coaxial with the center rod 31 of the delivery body 3 after installation, ensuring that the valve disassembly plug 1 does not fall during the delivery process, thus solving the problem of difficult thread connection between the valve disassembly plug 1 in the wellhead pressure channel and the side opening of the wellhead equipment body.

[0026] In an optional embodiment of this invention, the diameter of the cylindrical section 12 of the valve disassembly plug 1 is maximized, within structural limits, to increase the contact area with the cylindrical hole 22 of the connecting sleeve 2, thereby improving the stability and rigidity of the fit and reducing tilting or wobbling caused by lateral forces during insertion. The length of the cylindrical section 12 of the valve disassembly plug 1 is set to 1.5 times the diameter to ensure sufficient guiding length for smooth alignment, while avoiding excessive length leading to bulkiness or interference, thus providing optimal guiding effect while minimizing space occupation. This design significantly improves the alignment and stability of the valve disassembly plug 1 when inserted into the connecting sleeve 2, reduces the risk of swaying and falling, and ensures more precise and smooth thread connection; thereby reducing operational difficulty and improving reliability in high-pressure wellhead environments.

[0027] In an optional embodiment of this invention, a chamfered conical hole 23 is provided at the opening of the cylindrical hole 22 of the connecting sleeve 2. The chamfered conical hole 23 forms a conical transition surface at the opening, utilizing the inclined surface guiding effect to reduce the impact and friction during the initial insertion of the cylindrical section 12. This embodiment uses a chamfered conical hole 23 to allow for self-correction of minor deviations, guiding the cylindrical section 12 smoothly into the hole and avoiding "jamming." This design makes the insertion process of the valve disassembly plug 1 smoother and faster, reducing the time and manpower required for alignment and reducing component wear. In high-pressure wellhead environments, it can improve operational efficiency and reduce potential safety risks.

[0028] In an optional embodiment of this utility model, a positioning cone surface 13 is provided at the rear end of the cylindrical section 12 of the valve disassembly plug 1. In this embodiment, the positioning cone surface 13 is positioned at the rear end of the cylindrical section 12, utilizing the self-centering characteristic of the cone surface to provide radial and axial positioning after insertion. In this embodiment, the positioning cone surface 13 cooperates with the internal structure of the connecting sleeve 2 to form a "wedge effect," ensuring that the valve disassembly plug 1 is locked in its final position, preventing loosening or displacement. Based on the mechanical locking principle, this embodiment enhances the stability of the interface, improves the positioning accuracy and holding force of the valve disassembly plug 1 within the connecting sleeve 2, prevents displacement due to vibration or pressure changes during operation, and ensures the reliability of the threaded connection.

[0029] In an optional embodiment of this invention, the positioning cone surface 13 of the cylindrical section 12 of the valve disassembly plug 1 is set at an angle of 45°. By setting the 45° positioning cone surface 13, this embodiment can achieve a balance between strength and guidance, thereby optimizing stress distribution and reducing fatigue damage.

[0030] In an optional embodiment of this invention, a guide cone surface 14 is provided at the front end of the cylindrical section 12 of the valve disassembly plug 1. This embodiment utilizes the guide cone surface 14 to form a tapered guide surface at the front end of the cylindrical section 12, reducing the initial contact area and thus lowering the insertion resistance. This further simplifies the insertion operation of the valve disassembly plug 1, reduces "biting" or jamming, and improves the success rate of one-time docking. In the narrow space of the wellhead, this design can shorten the operation time and enhance safety.

[0031] In an optional embodiment of this invention, the guide cone 14 of the cylindrical section 12 of the valve disassembly plug 1 is set at an angle of 25° to 30°. By setting the guide cone 14 at 25° to 30°, this embodiment achieves a balance between ease of insertion and structural integrity, ensuring smooth insertion while avoiding stress concentration.

[0032] In an optional embodiment of this invention, a pressure port 24 communicating with the outside is provided inside the cylindrical hole 22 of the connecting sleeve 2. This embodiment addresses the issue that in a high-pressure natural gas environment, when the valve disassembly plug 1 is inserted, a gas lock or vacuum may form, generating resistance. The pressure port 24 is used to balance the pressure inside the cylindrical hole 22 with the external environment. The pressure port 22 provides a pressure relief channel, eliminating pressure differences and preventing "gas hammer effect" or sudden movement. This design ensures smooth operation and meets the safety standards for downhole equipment. Furthermore, it makes the process of removing and inserting the valve disassembly plug 1 more controllable and smooth, preventing component damage or accidental ejection due to pressure buildup, thereby improving the adaptability and safety of the device under high-pressure conditions and reducing maintenance requirements.

[0033] like Figure 4 As shown, in this embodiment, the connecting sleeve 2 is designed with a corresponding structure for connecting to the delivery body 3 and the valve disassembly plug 1. Its left end is threadedly connected to the center rod 31 of the delivery body 3 and locked with a pin. Its right end is designed with a standard hexagonal hole 21 and a cylindrical hole 22 in the middle section. The opening of the cylindrical hole is designed with a chamfered conical hole 23 that matches the positioning conical surface 13 of the valve disassembly plug 1. It is loosely connected to the hexagonal cylindrical surface 11 and the cylindrical section 12 of the improved valve disassembly plug 1, respectively. The cylindrical hole 22 and the cylindrical section 12 of the valve disassembly plug 1 are designed with a clearance fit tolerance that can be manually pushed in and a corresponding surface roughness. A pressure hole 24 for air pressure balance is designed at the left side of the connecting sleeve 2 to prevent air resistance between the valve disassembly plug 1 and the connecting sleeve 2 when the valve disassembly plug is installed or removed, thereby affecting the installation or removal.

[0034] When installing the valve removal plug 1, guided by the guide cone 14, the valve removal plug 1 is smoothly inserted into the cylindrical hole 22 of the connecting sleeve 2. The clearance fit cylindrical section 12 mainly ensures that the valve removal plug is coaxial with the center rod 31 of the delivery body 3 after installation, and there is no obvious sag in the horizontal state. When the valve removal plug 1 is delivered into place, the valve removal plug 1 contacts the inner hole of the wellhead device side opening. Due to the interaction of forces, the positioning cone 13 of the valve removal plug 1 fits tightly with the chamfered cone hole 23 of the inner cylindrical hole 22 of the connecting sleeve 2, further promoting the alignment of the valve removal plug 1. The center rod 31 of the delivery body 3 rotates in the forward direction, and through the mating hexagonal cylindrical surface 11, it drives the valve removal plug 1 to screw into the inner thread of the wellhead device side opening. When removing it, the center rod 31 of the delivery body 3 simply rotates in the reverse direction.

[0035] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

[0036] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood that the scope of protection of this invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A valve dismounting and plugging unit for a natural gas wellhead installation, characterized in that It includes a pick-and-place body (3), a connecting sleeve (2), and a valve disassembly plug (1); the connecting end of the connecting sleeve (2) is fixedly connected to the pick-and-place body (3); the mating end of the connecting sleeve (2) is provided with a hexagonal hole (21), and a cylindrical hole (22) is coaxially provided at the center of the hexagonal hole (21); the mating end of the valve disassembly plug (1) is provided with a hexagonal cylindrical surface (11) that mates with the hexagonal hole (21), and a cylindrical section (12) that mates with the cylindrical hole (22) is coaxially provided at the center of the hexagonal cylindrical surface (11).

2. A valve dismounting and plugging device for a natural gas wellhead installation according to claim 1, characterized in that The cylindrical section (12) of the valve disassembly plug (1) is set to a length of 1.5 times the diameter.

3. A valve dismounting and blocking device for a natural gas wellhead installation according to claim 1, characterized in that The cylindrical hole (22) of the connecting sleeve (2) is provided with a chamfered conical hole (23).

4. A valve dismounting and blocking device for a natural gas wellhead installation according to claim 3, characterized in that The rear end of the cylindrical section (12) of the valve disassembly plug (1) is provided with a positioning cone surface (13).

5. A valve dismounting and blocking device for a natural gas wellhead installation according to claim 4, characterized in that The positioning cone surface (13) of the cylindrical section (12) of the valve disassembly plug (1) is set at an angle of 45°.

6. A valve dismounting and plugging device for natural gas wellhead equipment according to claim 1, characterized in that, The valve disassembly plug (1) has an inlet cone (14) at the front end of the cylindrical section (12).

7. A valve dismounting and blocking device for a natural gas wellhead installation according to claim 6, characterized in that The guide cone (14) of the cylindrical section (12) of the valve disassembly plug (1) is set at an angle of 25° to 30°.

8. A valve dismounting and blocking device for a natural gas wellhead installation according to claim 1, characterized in that The cylindrical hole (22) of the connecting sleeve (2) is provided with an air pressure hole (24) that communicates with the outside.

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