Composite multifunctional eccentric oil production wellhead device

Abstract

The utility model provides a composite multifunctional eccentric oil production wellhead device, which remarkably improves the reliability and functionality of the device through the asymmetric arrangement of double oil pipes in a hanger and the collaborative design of a sealing assembly. The thrust ball bearing is additionally arranged between the hanger and the wellhead main body, so that the frictional resistance during eccentric adjustment of an oil pipe is effectively reduced, a redundant sealing structure is formed by matching with the multi-stage O-shaped sealing ring, and the leakage risk caused by friction jamming and sealing failure of a traditional device is solved; the modular connection design of the union and the gate valve realizes the quick disassembly and assembly of the valve assembly, and the pressure gauge integrated on the stop valve is combined, so that the pressure change in the oil pipe can be monitored in real time, the maintenance process is simplified, and the working condition adaptability is expanded. In addition, the upper flange is additionally arranged, so that the butt joint stability of the wellhead body and external equipment is improved. Through the synergistic effect of the technical characteristics, the device has the advantages of efficient sealing, low-resistance adjustment and multifunctional integration, and is particularly suitable for high-water-content oil fields and complex layer mining scenes.

Description

Technical Field

[0001] This utility model relates to the field of wellhead devices, and in particular to a composite multifunctional eccentric oil wellhead device. Background Technology

[0002] In the oil and gas extraction industry, wellhead equipment is a key component of the oil and gas well production system, and its structural design directly affects oil production efficiency, operational safety, and equipment maintenance convenience. Traditional oil wellhead equipment mostly adopts a single coaxial tubing structure, which is difficult to meet the needs of complex operating conditions such as multi-level extraction, testing, and integrated injection and production. As oilfield development moves towards refinement and efficiency, eccentric wellhead technology has gradually gained attention. It achieves independent control of multiple channels through asymmetric tubing layout. Existing technologies often employ a double tubing suspension structure with integrated valve components, enabling stratified extraction with double tubing within a limited space. However, existing technologies still suffer from insufficient functional integration, low sealing reliability, and limited operational flexibility in practical applications.

[0003] In existing eccentric wellhead systems, the tubing hanger seals mostly rely on a single O-ring or packing seal structure. Long-term exposure to downhole high pressure and temperature fluctuations can easily lead to seal failure and leakage risks. Furthermore, the rigid connection between the traditional hanger and the wellhead body lacks a buffer mechanism, making frictional resistance during tubing eccentric adjustment difficult and hindering hanger rotation, thus affecting operational efficiency. On the other hand, existing systems have poor functional expandability. For example, the connection between gate valves and stop valves is often a fixed design, unable to quickly adapt to different operating conditions. Pressure monitoring modules are also often externally located, separate from the main structure, increasing system complexity.

[0004] In summary, existing eccentric wellhead devices still have significant technical bottlenecks in terms of sealing reliability, operational flexibility, and multi-functional integration. There is an urgent need for a wellhead device that can simultaneously achieve efficient sealing, low-friction adjustment, and multi-functional modular integration in order to reduce maintenance costs, improve oil production efficiency, and adapt to complex mining environments. Utility Model Content

[0005] The purpose of this invention is to provide a composite multifunctional eccentric oil wellhead device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a composite multifunctional eccentric oil wellhead device, including a wellhead body, a hanger inside the wellhead body, a first oil pipe and a second oil pipe inside the hanger, a double male short joint sealed to the top of the first oil pipe, a conical sleeve sealed to the top of the double male short joint, a union sealed to the top of the second oil pipe, a gate valve sealed to the top of the union, and a stop valve sealed to the top of the gate valve through a joint.

[0008] Preferably, an upper flange is connected to the upper end of the wellhead body.

[0009] Preferably, O-rings are provided between the hanger and the wellhead body, and between the hanger and the upper flange.

[0010] Preferably, a thrust ball bearing is provided between the hanger and the wellhead body.

[0011] Preferably, the shut-off valve is equipped with a pressure gauge.

[0012] The present invention achieves the following beneficial technical effects compared to the prior art:

[0013] This utility model provides a composite multifunctional eccentric oil wellhead device. Through the asymmetrical arrangement of the double tubing within the hanger and the synergistic design of the sealing components, the reliability and functionality of the device are significantly improved. A thrust ball bearing is added between the hanger and the wellhead body, effectively reducing frictional resistance during tubing eccentric adjustment. Combined with multi-stage O-ring seals forming a redundant sealing structure, this solves the leakage risk caused by friction jamming and seal failure in traditional devices. The modular connection design of the union and gate valve enables rapid assembly and disassembly of the valve components. Combined with the pressure gauge integrated on the gate valve, real-time monitoring of pressure changes within the tubing is possible, simplifying maintenance procedures and expanding operational adaptability. Furthermore, the addition of the upper flange improves the docking stability between the wellhead body and external equipment. The synergistic effect of these technical features gives the device the advantages of high-efficiency sealing, low-resistance regulation, and multifunctional integration, making it particularly suitable for high-water-cut oilfields and complex formation extraction scenarios. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of a composite multifunctional eccentric oil wellhead device provided by this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The purpose of this invention is to provide a composite multifunctional eccentric oil wellhead device to solve the problems existing in the prior art.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1:

[0020] This embodiment provides a composite multifunctional eccentric oil wellhead device, such as... Figure 1 As shown, the wellhead includes a main body 1, a hanger 2 is provided inside the main body 1, a first oil pipe 3 and a second oil pipe 4 are provided inside the hanger 2, a double male short joint 5 is sealed to the top of the first oil pipe 3, a cone sleeve 6 is sealed to the top of the double male short joint 5, a union 7 is sealed to the top of the second oil pipe 4, a gate valve 8 is sealed to the top of the union 7, and a stop valve 10 is sealed to the gate valve 8 through a connector 9.

[0021] In one implementation, an upper flange 11 is connected to the upper end of the wellhead body 1.

[0022] In one implementation, O-rings 12 are provided between the hanger 2 and the wellhead body 1, and between the hanger 2 and the upper flange 11.

[0023] As one implementation, a thrust ball bearing 13 is provided between the hanger 2 and the wellhead body 1.

[0024] In one embodiment, a pressure gauge 14 is provided on the shut-off valve 10.

[0025] This utility model's composite multi-functional eccentric wellhead device significantly improves the reliability and functionality of the device through the asymmetrical arrangement of the double tubing within the hanger and the synergistic design of the sealing components. Specifically, a thrust ball bearing is added between the hanger and the wellhead body to effectively reduce frictional resistance during tubing eccentric adjustment. Combined with multi-stage O-ring seals to form a redundant sealing structure, it solves the leakage risk caused by friction jamming and seal failure in traditional devices. The modular connection design of the union and gate valve enables rapid assembly and disassembly of the valve components. Combined with the pressure gauge integrated on the shut-off valve, it allows for real-time monitoring of pressure changes within the tubing, simplifying maintenance procedures and expanding operational adaptability. Furthermore, the sealing cooperation between the double male short section and the tapered sleeve further strengthens the pressure resistance of the first tubing, while the addition of the upper flange improves the docking stability between the wellhead body and external equipment. The synergistic effect of these technical features gives the device the advantages of high-efficiency sealing, low-resistance regulation, and multi-functional integration, making it particularly suitable for high-water-cut oilfields and complex formation extraction scenarios.

[0026] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A composite multifunctional eccentric oil production wellhead device, characterized in that: The wellhead body is internally provided with a hanger, the hanger is internally provided with a first tubing and a second tubing, the top end of the first tubing is sealingly connected with a double-male short section, the top end of the double-male short section is sealingly connected with a cone sleeve, the top end of the second tubing is sealingly connected with a by nine, the top end of the by nine is sealingly connected with a gate valve, and the gate valve is sealingly connected with a stop valve through a joint.

2. The composite multi-functional eccentric oil production wellhead device according to claim 1, characterized in that: The upper end of the wellhead body is connected with an upper flange.

3. The composite multi-functional eccentric oil production wellhead device according to claim 2, characterized in that: O-shaped sealing rings are arranged between the hanger and the wellhead body and between the hanger and the upper flange.

4. The composite multi-functional eccentric oil production wellhead apparatus of claim 1, wherein: A thrust ball bearing is arranged between the hanger and the wellhead body.

5. The composite multi-functional eccentric oil wellhead device of claim 1, wherein: A pressure gauge is arranged on the stop valve.

Images