Anti-freezing corrosion-resistant water injection wellhead device

Abstract

The anti-freezing corrosion-resistant water injection wellhead device has the advantages of being compact in structure, high in sealing performance and wide in adaptability, the multi-wedge-shaped gate valve and double-four-way combined structure is adopted, and the flange backing ring and the O-shaped sealing ring are matched, so that the sealing reliability in the low-temperature environment is remarkably improved; meanwhile, the corrosion resistance and the anti-freezing performance of the valve are enhanced through hoop connection and thread protection design, and the stability under the high-pressure working condition is further ensured through the jackscrew fixing mode of the oil pipe hanger. The device effectively solves the problems that a traditional water injection wellhead is prone to leakage and corrosion and poor in low-temperature adaptability, and is particularly suitable for meeting the long-term operation requirement of a high-cold and high-corrosion water injection well.

Description

Technical Field

[0001] This utility model relates to the field of wellhead devices, and in particular to a freeze-resistant and corrosion-resistant water injection wellhead device. Background Technology

[0002] Water injection wellhead equipment is a key component of oilfield water injection systems, primarily used to control the injection pressure, flow rate, and direction of the water injection well, while ensuring wellhead sealing and safety. In cold regions or corrosive environments, water injection wellhead equipment needs to possess antifreeze and corrosion-resistant properties to cope with material embrittlement caused by low temperatures, seal failure, and erosion of components by corrosive media. Currently, conventional water injection wellhead equipment is typically manufactured using ordinary carbon steel, with components connected by flanges or threads. However, under extreme operating conditions, its reliability and durability face severe challenges.

[0003] Existing water injection wellhead devices suffer from the following main problems: First, traditional structures often use flat gate valves or ordinary flange connections, which are prone to sealing failure due to material shrinkage or freezing expansion in low-temperature environments, and may even cause the gate valve to jam. Second, ordinary carbon steel structures are prone to pitting corrosion or stress corrosion cracking when exposed to corrosive media such as hydrogen sulfide and carbon dioxide for extended periods, shortening the equipment's service life. Furthermore, the tubing hangers in existing devices have insufficient sealing, making them prone to leakage under high-pressure water injection conditions, affecting injection efficiency and increasing maintenance costs. For example, existing water injection wellhead devices employ a single-layer sealing structure, which is insufficient to meet the long-term sealing requirements of high-pressure water injection wells and lacks anti-freezing design for low-temperature environments.

[0004] Therefore, how to design a water injection wellhead device that combines antifreeze, corrosion resistance and reliable sealing has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to provide a freeze-proof and corrosion-resistant water injection 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 freeze-resistant and corrosion-resistant water injection wellhead device, including a large four-way valve. The bottom end of the large four-way valve is sealed and connected to a casing short connector. The left end of the large four-way valve is sealed and connected to a first wedge gate valve. The right end of the large four-way valve is sealed and connected to a second wedge gate valve. The top end of the large four-way valve is sealed and connected to a third wedge gate valve. The third wedge gate valve is sealed and connected to a small four-way valve. The left end of the small four-way valve is sealed and connected to a fourth wedge gate valve. The right end of the small four-way valve is sealed and connected to a fifth wedge gate valve. The top end of the small four-way valve is sealed and connected to a sixth wedge gate valve.

[0008] Preferably, the sleeve is connected to the large cross-connector via a lower flange, and a flange gasket is provided between the lower flange and the large cross-connector, which are connected by bolt heads.

[0009] Preferably, the large four-way connector is connected to the oil pipe via an oil pipe hanger.

[0010] Preferably, the tubing hanger is installed inside the large four-way connector via a set screw.

[0011] Preferably, the outside of the tubing hanger is provided with an O-ring seal.

[0012] Preferably, the large four-way valve is sealed to the third wedge gate valve via an upper flange.

[0013] Preferably, the first wedge gate valve, the second wedge gate valve, the third wedge gate valve, the fourth wedge gate valve, the fifth wedge gate valve, and the sixth wedge gate valve are all provided with clamps at both ends.

[0014] Preferably, the ends of the first wedge gate valve, the second wedge gate valve, the fourth wedge gate valve, and the fifth wedge gate valve are all provided with protective wires.

[0015] Preferably, the end of the sixth wedge gate valve is provided with a plug.

[0016] The present invention achieves the following beneficial technical effects compared to the prior art:

[0017] This utility model provides a freeze-resistant and corrosion-resistant water injection wellhead device with a compact structure, strong sealing performance, and wide adaptability. By employing a multi-wedge gate valve combined with a double four-way valve, along with flange gaskets and O-rings, the sealing reliability in low-temperature environments is significantly improved. Simultaneously, the clamp connection and wire protection design enhance the valve's corrosion resistance and freeze-resistant performance, while the top screw fixing method of the tubing hanger further ensures stability under high-pressure conditions. This device effectively solves the problems of easy leakage, easy corrosion, and poor low-temperature adaptability of traditional water injection wellheads, and is particularly suitable for the long-term operational needs of water injection wells in extremely cold and highly corrosive environments. Attached Figure Description

[0018] 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.

[0019] Figure 1 A schematic diagram of a freeze-proof and corrosion-resistant water injection wellhead device provided by this utility model. Detailed Implementation

[0020] 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.

[0021] The purpose of this invention is to provide a freeze-proof and corrosion-resistant water injection wellhead device to solve the problems existing in the prior art.

[0022] 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.

[0023] Example 1:

[0024] This embodiment provides a freeze-proof and corrosion-resistant water injection wellhead device, such as... Figure 1 As shown, it includes a large four-way valve 1, with a sleeve short-circuit 2 sealingly connected to the bottom end of the large four-way valve 1, a first wedge gate valve 3 sealingly connected to the left end of the large four-way valve 1, a second wedge gate valve 4 sealingly connected to the right end of the large four-way valve 1, a third wedge gate valve 5 sealingly connected to the top end of the large four-way valve 1, a small four-way valve 6 sealingly connected to the third wedge gate valve 5, a fourth wedge gate valve 7 sealingly connected to the left end of the small four-way valve 6, a fifth wedge gate valve 8 sealingly connected to the right end of the small four-way valve 6, and a sixth wedge gate valve 9 sealingly connected to the top end of the small four-way valve 6.

[0025] In one implementation, the sleeve short connector 2 is sealed to the large cross 1 via the lower flange 10. A flange gasket 11 is provided between the lower flange 10 and the large cross 1, and they are connected by bolts 12.

[0026] In one implementation, the large four-way connector 1 is connected to the oil pipe short-circuit 14 via the oil pipe hanger 13.

[0027] In one implementation, the tubing hanger 13 is installed inside the cross joint 1 via a set screw 15.

[0028] In one embodiment, the outside of the tubing hanger 13 is provided with an O-ring seal 16.

[0029] In one implementation, the large four-way valve 1 is sealed to the third wedge gate valve 5 via the upper flange 17.

[0030] In one embodiment, clamps 18 are provided at both ends of the first wedge gate valve 3, the second wedge gate valve 4, the third wedge gate valve 5, the fourth wedge gate valve 7, the fifth wedge gate valve 8, and the sixth wedge gate valve 9.

[0031] In one embodiment, the ends of the first wedge gate valve 3, the second wedge gate valve 4, the fourth wedge gate valve 7 and the fifth wedge gate valve 8 are all provided with protective wires 19.

[0032] In one implementation, the end of the sixth wedge gate valve 9 is provided with a plug 20.

[0033] This utility model provides a freeze-resistant and corrosion-resistant water injection wellhead device with a compact structure, strong sealing performance, and wide adaptability. By employing a multi-wedge gate valve combined with a double four-way valve, along with flange gaskets and O-rings, the sealing reliability in low-temperature environments is significantly improved. Simultaneously, the clamp connection and wire protection design enhance the valve's corrosion resistance and freeze-resistant performance, while the top screw fixing method of the tubing hanger further ensures stability under high-pressure conditions. This device effectively solves the problems of easy leakage, easy corrosion, and poor low-temperature adaptability of traditional water injection wellheads, and is particularly suitable for the long-term operational needs of water injection wells in extremely cold and highly corrosive environments.

[0034] 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 freeze and corrosion resistant injection wellhead apparatus, characterized by: The utility model discloses a big four -way, the bottom end sealing connection of big four -way has bushing short -circuit, the left end sealing connection of big four -way has first wedge gate valve, the right end sealing connection of big four -way has second wedge gate valve, the top end sealing connection of big four -way has third wedge gate valve, the sealing connection of third wedge gate valve has little four -way, the left end sealing connection of little four -way has fourth wedge gate valve, the right end sealing connection of little four -way has fifth wedge gate valve, the top end sealing connection of little four -way has sixth wedge gate valve.

2. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: The bushing short -circuit is sealedly connected with the big four -way through the lower flange, and the flange gasket ring is arranged between the lower flange and the big four -way and is connected through the bolt head bolt.

3. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: The big four -way is connected with the oil pipe short -circuit through the oil pipe hanger.

4. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 3, wherein: The oil pipe hanger is installed in the big four -way through the top pin.

5. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 3, wherein: The outside of the oil pipe hanger is provided with an O-shaped sealing ring.

6. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: The big four -way is sealedly connected with the third wedge gate valve through the upper flange.

7. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: Both ends of the first wedge gate valve, the second wedge gate valve, the third wedge gate valve, the fourth wedge gate valve, the fifth wedge gate valve and the sixth wedge gate valve are provided with the clamp.

8. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: The end of the first wedge gate valve, the second wedge gate valve, the fourth wedge gate valve and the fifth wedge gate valve is provided with the wire protection.

9. The freeze resistant, corrosion resistant water injection wellhead apparatus of claim 1, wherein: The end of the sixth wedge gate valve is provided with the plug.

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