Leak-proof thermal recovery wellhead device

Abstract

According to the anti-leakage thermal recovery wellhead device, through the design of a multi-stage sealing structure and a modular valve set, the reliability and operation convenience under the high-temperature and high-pressure working conditions are remarkably improved; a double-layer structure of the four-way main body and the small four-way is matched with the distributed layout of the six thermal recovery flat valves, so that multi-channel independent control is realized, and sealing surface abrasion caused by frequent opening and closing of the same valve during switching of a traditional single four-way valve is avoided; each connecting end adopts multiple sealing, so that bolt pre-tightening force attenuation caused by thermal stress can be effectively resisted, and interface leakage is prevented; in addition, due to the integrated design of the stop valve and the pressure gauge, the wellhead pressure can be monitored in real time, and due to the combination of the testing connector and the conversion connector, external equipment can be conveniently and rapidly connected for working condition testing or emergency pressure relief, and the safety and the maintenance efficiency are greatly improved. The overall structure shows longer service life and lower failure rate in a high-temperature steam oil displacement process by optimizing the cooperative configuration of sealing levels and functional modules.

Description

Technical Field

[0001] This utility model relates to the field of wellhead devices, and in particular to a leak-proof thermal recovery wellhead device. Background Technology

[0002] Thermal recovery wellhead equipment is a key piece of equipment in the heavy oil extraction process, mainly used for high-temperature, high-pressure steam injection and oil and gas production control. In thermal recovery processes, wellhead equipment must withstand high-temperature steam exceeding 300℃ and operating pressures above 20MPa for extended periods, while also facing frequent switching operations and media corrosion. This places extremely high demands on the structure's sealing performance, heat resistance, and reliability. In existing technologies, conventional thermal recovery wellheads often employ a single four-way structure, using flanges to connect several flat valves to achieve process switching. For example, the main body is a four-way structure, with flat valves connected to the top and sides to control fluid flow direction. However, this design has significant drawbacks in practical applications: First, traditional four-way valves and flat valves often use a single sealing gasket or spiral wound gasket, which is prone to creep relaxation under high-temperature cyclic loads, increasing the risk of leakage at the flange connection. Second, the arrangement of flat valves is limited (e.g., only left, right, and top valves are configured), making it difficult to adapt to the multi-channel switching requirements under complex operating conditions, and the entire valve assembly needs to be shut down for maintenance, affecting production efficiency. Third, existing equipment lacks integrated pressure monitoring and testing interfaces, making it impossible for operators to monitor internal pressure changes in real time, and temporary external pipelines are required for testing or emergency depressurization, posing safety hazards. Furthermore, some wellhead equipment lacks heat-resistant reinforcement structures in the main pipe sections, making them prone to deformation under long-term high temperatures, further exacerbating sealing failure. For example, a serious production accident occurred in an oilfield due to steam leakage caused by thermal fatigue cracking of the wellhead main body short section.

[0003] Therefore, how to design a thermal recovery wellhead device with better sealing performance, flexible valve configuration, and heat resistance and deformation resistance has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a leak-proof thermal recovery wellhead device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a leak-proof thermal recovery wellhead device, including a four-way main body. A first thermal recovery plate valve is sealed to the left end of the four-way main body, a second thermal recovery plate valve is sealed to the right end of the four-way main body, a third thermal recovery plate valve is sealed to the top end of the four-way main body, a small four-way valve is sealed to the third thermal recovery plate valve, a fourth thermal recovery plate valve is sealed to the left end of the small four-way valve, a fifth thermal recovery plate valve is sealed to the right end of the small four-way valve, and a sixth thermal recovery plate valve is sealed to the top end of the small four-way valve.

[0007] Preferably, the bottom end of the four-way body is sealed to the lower flange by a double-ended bolt, and the top end of the four-way body is sealed to the upper flange by a double-ended bolt.

[0008] Preferably, the ends of the first thermal recovery plate valve, the second thermal recovery plate valve, the third thermal recovery plate valve, the fourth thermal recovery plate valve, the fifth thermal recovery plate valve, and the sixth thermal recovery plate valve are all sealed with threaded flanges.

[0009] Preferably, the lower flange, the upper flange, the first thermal recovery plate valve, the second thermal recovery plate valve, the third thermal recovery plate valve, the fourth thermal recovery plate valve, the fifth thermal recovery plate valve, and the sixth thermal recovery plate valve are all connected by sealing gaskets.

[0010] Preferably, both the first thermal recovery flat plate valve and the sixth thermal recovery flat plate valve have a shut-off valve sealed to their ends via a shut-off valve connector, and the shut-off valve is equipped with a pressure gauge.

[0011] Preferably, the four-way body is provided with a heat-resistant pipe section.

[0012] Preferably, both the second thermal recovery flat plate valve and the fourth thermal recovery flat plate valve have threaded plugs sealed to their ends.

[0013] Preferably, the fifth thermal recovery plate valve has an end-sealed connection to a conversion joint, and the conversion joint has a side-sealed connection to a test joint.

[0014] The present invention achieves the following beneficial technical effects compared to the prior art:

[0015] This utility model provides a leak-proof thermal recovery wellhead device. Through a multi-stage sealing structure and modular valve group design, it significantly improves reliability and ease of operation under high-temperature and high-pressure conditions. The double-layer structure of the four-way main body and the small four-way, combined with the distributed layout of six thermal recovery flat valves, enables independent control of multiple channels, avoiding the wear of the sealing surface caused by frequent opening and closing of the same valve during traditional single four-way switching. Multiple seals at each connection end effectively resist bolt preload attenuation caused by thermal stress, preventing interface leakage. Furthermore, the integrated design of the shut-off valve and pressure gauge allows for real-time monitoring of wellhead pressure, while the combination of test connectors and conversion connectors facilitates quick connection to external equipment for operational testing or emergency pressure relief, greatly improving safety and maintenance efficiency. The overall structure, through optimized sealing levels and coordinated configuration of functional modules, exhibits a longer service life and lower failure rate in high-temperature steam-driven oil recovery processes. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of a leak-proof thermal recovery wellhead device provided by this utility model. Detailed Implementation

[0018] 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.

[0019] The purpose of this invention is to provide a leak-proof thermal recovery wellhead device to solve the problems existing in the prior art.

[0020] 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.

[0021] Example 1:

[0022] This embodiment provides a leak-proof thermal recovery wellhead device, such as... Figure 1 As shown, it includes a four-way body 1, a first thermal recovery plate valve 2 sealed to the left end of the four-way body 1, a second thermal recovery plate valve 3 sealed to the right end of the four-way body 1, a third thermal recovery plate valve 4 sealed to the top end of the four-way body 1, a small four-way 5 sealed to the third thermal recovery plate valve 4, a fourth thermal recovery plate valve 6 sealed to the left end of the small four-way 5, a fifth thermal recovery plate valve 7 sealed to the right end of the small four-way 5, and a sixth thermal recovery plate valve 8 sealed to the top end of the small four-way 5.

[0023] In one implementation, the bottom end of the four-way body 1 is sealed to the lower flange 10 by a double-ended bolt 9, and the top end of the four-way body 1 is sealed to the upper flange 11 by a double-ended bolt 9.

[0024] In one implementation, the ends of the first thermal recovery plate valve 2, the second thermal recovery plate valve 3, the third thermal recovery plate valve 4, the fourth thermal recovery plate valve 6, the fifth thermal recovery plate valve 7, and the sixth thermal recovery plate valve 8 are all sealed with threaded flanges 12.

[0025] In one implementation, the lower flange 10, the upper flange 11, the first thermal recovery plate valve 2, the second thermal recovery plate valve 3, the third thermal recovery plate valve 4, the fourth thermal recovery plate valve 6, the fifth thermal recovery plate valve 7, and the sixth thermal recovery plate valve 8 are all sealed and connected by a sealing gasket 13.

[0026] In one embodiment, the ends of the first thermal recovery flat plate valve 2 and the sixth thermal recovery flat plate valve 8 are both sealed with a stop valve 15 through a stop valve connector 14, and a pressure gauge 16 is provided on the stop valve 15.

[0027] As one implementation method, the four-way body 1 is provided with a heat-resistant tube short section 17.

[0028] In one implementation, both the second thermal recovery flat plate valve 3 and the fourth thermal recovery flat plate valve 6 are sealed with threaded plugs 18 at their ends.

[0029] In one embodiment, the fifth thermal recovery plate valve 7 is sealed at the end with a conversion joint 19, and the conversion joint 19 is sealed at the side with a test joint 20.

[0030] This invention's leak-proof thermal recovery wellhead device significantly improves reliability and ease of operation under high-temperature and high-pressure conditions through a multi-stage sealing structure and modular valve group design. Specifically, the double-layer structure of the four-way main body and the small four-way, combined with the distributed layout of six thermal recovery flat valves, enables independent control of multiple channels, avoiding the wear of the sealing surface caused by frequent opening and closing of the same valve during traditional single four-way switching. Each connection end uses upper and lower flanges secured with double-headed bolts and threaded flanges, supplemented by multiple seals (such as metal-graphite composite gaskets) to effectively resist bolt preload attenuation caused by thermal stress and prevent interface leakage. The heat-resistant pipe section, through internal high-temperature alloy overlay welding, reduces the risk of deformation caused by uneven thermal expansion of the main body. Furthermore, the integrated design of the shut-off valve and pressure gauge allows for real-time monitoring of wellhead pressure, while the combination of test connectors and conversion connectors facilitates quick connection to external equipment for operational testing or emergency pressure relief, significantly improving safety and maintenance efficiency. The overall structure, through optimized sealing levels and coordinated configuration of functional modules, exhibits a longer service life and lower failure rate in high-temperature steam-driven oil recovery processes.

[0031] 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 leak-tight thermal production wellhead apparatus, characterized by: The utility model provides a four -way main body, the left end sealed connection has first hot flat plate valve of the four -way main body, the right end sealed connection has second hot flat plate valve of the four -way main body, the top end sealed connection has third hot flat plate valve of the four -way main body, the third hot flat plate valve sealed connection has small four -way, the left end sealed connection has fourth hot flat plate valve of the small four -way, the right end sealed connection has fifth hot flat plate valve of the small four -way, the top end sealed connection has sixth hot flat plate valve of the small four -way; The end of the first hot flat plate valve and the sixth hot flat plate valve is sealed and connected with a stop valve through a stop valve joint, and a pressure gauge is arranged on the stop valve; A heat-resistant pipe short section is arranged in the four-way main body; The end of the fifth hot flat plate valve is sealed and connected with a conversion joint, and the side of the conversion joint is sealed and connected with a test joint.

2. The leak resistant thermal recovery wellhead apparatus of claim 1, wherein: The bottom end of the four-way main body is sealed and connected with a lower flange through a double-end bolt, and the top end of the four-way main body is sealed and connected with an upper flange through a double-end bolt.

3. The leak resistant thermal production wellhead apparatus of claim 2, wherein: The end of the first hot flat plate valve, the second hot flat plate valve, the third hot flat plate valve, the fourth hot flat plate valve, the fifth hot flat plate valve and the sixth hot flat plate valve is sealed and connected with a screw flange.

4. The leak resistant thermal recovery wellhead apparatus of claim 3, wherein: The lower flange, the upper flange, the first hot flat plate valve, the second hot flat plate valve, the third hot flat plate valve, the fourth hot flat plate valve, the fifth hot flat plate valve and the sixth hot flat plate valve are sealed and connected through a sealing gasket ring.

5. The leak resistant thermal recovery wellhead apparatus of claim 1, wherein: The end of the second hot flat plate valve and the fourth hot flat plate valve is sealed and connected with a plug.

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