Auxiliary hydraulic operation device for surface safety valve of Christmas tree
By designing a hydraulic operating device, the problems of difficult operation of large-scale safety valves and spring failure were solved, enabling rapid and stable emergency operation and remote monitoring, thus ensuring oilfield production safety and capacity maintenance.
Patent Information
- Application Number
- CN202423056933.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing emergency operating devices are difficult to operate in large-sized safety valves due to high torque, slow operation time, and lack of solutions for handling safety valve spring failure.
An auxiliary hydraulic operating device for the surface safety valve of the wellhead was designed. It is connected to the safety valve through a connecting block and uses the upper and lower oil ports to realize emergency valve opening and closing. Combined with the observation port and indicator rod, it supports remote monitoring, replaces manual operation, and is applicable to various types of surface safety valves.
It enables rapid and stable emergency opening and closing of safety valves, solves the problem of spring failure, ensures oilfield production safety, and supports remote monitoring and production capacity maintenance.
Smart Images
Figure CN223621576U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil and natural gas extraction technology, specifically to an auxiliary hydraulic operation device for a surface safety valve of an oil wellhead. Background Technology
[0002] In the oil and gas extraction process, many valves are used in wellhead equipment and manifolds, mainly gate valves and throttle valves. Gate valves are primarily used to shut off pipeline media, while surface safety valves, a special type of gate valve, are critical equipment in the oil and gas industry used to ensure the safety of extraction and transportation processes. They are installed in wellhead equipment or surface processes, and their main function is to provide safety protection in the event of oil and gas leaks, fires, or other emergencies.
[0003] Ground safety valves can be categorized into pneumatic piston safety valves, pneumatic diaphragm safety valves, and hydraulic safety valves, depending on their actuation method. Various accessories can be fitted to the top of each type of safety valve, such as fusible plugs, transport caps, position sensors, and manual actuation devices. The manual actuation device can be used for emergency operation of the valve in case of control source failure. Currently, all emergency actuation devices are manual; however, in large-sized safety valves, manual actuation devices present problems such as difficult operation, high torque, and slow operation time. Furthermore, current emergency actuation devices lack a solution for handling situations where the safety valve spring fails. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides an auxiliary hydraulic operating device for the surface safety valve of the oil well tree. This solves the problems that current emergency operating devices are all manual, but in large-sized safety valves, manual drive devices are difficult to operate, have high torque, and slow operation time. Furthermore, current emergency operating devices do not have a solution for handling the failure of the safety valve spring.
[0005] This utility model provides the following technical solution: an auxiliary hydraulic operation device for a surface safety valve of an oil well tree, comprising a device body, a surface safety valve, and a connecting block, wherein the device body is connected to an indicator rod on the surface safety valve actuator through the connecting block;
[0006] The device body includes a lower cylinder head conversion connection assembly, a cylinder body, an upper cylinder head, a piston, an indicator rod, and a piston rod. The lower cylinder head conversion connection assembly is installed at the bottom end of the cylinder body, the upper cylinder head is installed at the top end of the cylinder body, the piston is installed inside the cylinder body, the piston rod is installed inside the piston and the lower cylinder head conversion connection assembly, the indicator rod is installed inside the upper cylinder head, a lower rod seal is installed between the lower cylinder head conversion connection assembly and the piston rod, a lower cylinder seal is installed between the lower cylinder head conversion connection assembly and the cylinder body, an upper rod seal is installed between the upper cylinder head and the indicator rod, and an upper cylinder seal is installed between the upper cylinder head and the cylinder body.
[0007] Preferred technical solution 1: The lower cylinder head conversion connection assembly has a lower observation port on its surface.
[0008] Preferred technical solution 2: The upper cylinder head is provided with an upper oil port, the upper oil port is equipped with an upper cylinder plug, and the upper oil port is connected to the upper hydraulic chamber.
[0009] Preferred technical solution 3: The lower cylinder head conversion connection assembly is provided with a lower oil port, and a lower cylinder plug is installed at the lower oil port. The lower oil port is connected to the lower hydraulic chamber.
[0010] Preferred technical solution four: The bottom of the lower cylinder head conversion connection assembly has a conversion connection structure, including but not limited to threaded connection.
[0011] Preferred technical solution five: A piston seal and a wear-resistant ring are installed between the piston and the cylinder.
[0012] Compared with existing technologies, this utility model provides an auxiliary hydraulic operating device for the surface safety valve of an oil well, which has the following advantages: It connects to the upper part of the safety valve via a connecting block, and pressurizes the upper oil port to achieve emergency opening of the safety valve, thereby maintaining production capacity in the event of a safety valve failure at the oilfield site and ensuring continued production before maintenance work begins. By pressurizing the lower oil port, it achieves emergency shut-off of the safety valve, thereby ensuring safe production at the oilfield site when the safety valve spring fails. The observation port of the lower cylinder head connection device allows continuous monitoring of the safety valve's opening and closing status, and can be combined with a proximity switch (sensor) for remote monitoring. An optional indicator rod is installed on the top, making on-site monitoring of the safety valve's opening and closing status more convenient and conspicuous. It can be used for all types of surface safety valves and can replace manual operating mechanisms to achieve faster emergency opening / closing, with good stability and short response time. Meanwhile, this invention can solve the problem of emergency shutdown in the event of safety valve spring failure, which is impossible with manual drive devices, thus addressing a pain point on-site. In addition, the observation port and indicator rod set in the lower cylinder head conversion connection device can not only directly observe the safety valve switch status, but also support the addition of proximity sensors to meet the needs of modern remote monitoring, and have good application prospects. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] Figure 2 This is a cross-sectional view of the device body of this utility model.
[0015] In the diagram: 1. Device body; 2. Ground safety valve; 3. Connecting block; 1.1. Lower cylinder head conversion connection assembly; 1.2. Piston rod; 1.3. Cylinder body; 1.4. Piston; 1.5. Upper cylinder head; 1.6. Upper cylinder plug; 1.7. Indicator rod; 1.9. Upper rod seal; 1.11. Piston seal; 1.12. Wear ring; 1.13. Lower cylinder seal; 1.14. Lower rod seal. Detailed Implementation
[0016] Please see Figure 1-2 ,
[0017] Example 1: An auxiliary hydraulic operation device for a surface safety valve of an oil well tree includes a device body 1, a surface safety valve 2, and a connecting block 3. The device body 1 is connected to the indicator rod on the driver of the surface safety valve 2 through the connecting block 3.
[0018] The main body 1 of the device includes a lower cylinder head conversion connection assembly 1.1, a cylinder body 1.3, an upper cylinder head 1.5, a piston 1.4, an indicator rod 1.7, and a piston rod 1.2. The lower cylinder head conversion connection assembly 1.1 is installed at the bottom end of the cylinder body 1.3, the upper cylinder head 1.5 is installed at the top end of the cylinder body 1.3, the piston 1.4 is installed inside the cylinder body 1.3, the piston rod 1.2 is installed inside the piston 1.4 and the lower cylinder head conversion connection assembly 1.1, the indicator rod 1.7 is installed inside the upper cylinder head 1.5, a lower rod seal 1.15 is installed between the lower cylinder head conversion connection assembly 1.1 and the piston rod 1.2, a lower cylinder seal 1.14 is installed between the lower cylinder head conversion connection assembly 1.1 and the cylinder body 1.3, an upper rod seal 1.9 is installed between the upper cylinder head 1.5 and the indicator rod 1.7, and an upper cylinder seal 1.10 is installed between the upper cylinder head 1.5 and the cylinder body 1.3.
[0019] Example 2: The difference between this example and Example 1 is that the lower cylinder head conversion connection assembly 1.1 has a lower observation port on its surface, which can continuously observe the switch status of the safety valve and can be combined with a proximity switch sensor to achieve remote monitoring.
[0020] Example 3: The difference between this example and Example 1 is that the upper cylinder head 1.5 is provided with an upper oil port, and an upper cylinder plug 1.6 is installed on the upper oil port. The upper oil port is connected to the upper hydraulic chamber. By pressurizing the upper hydraulic chamber through the upper oil port, the ground safety valve 2 can be opened in an emergency and maintained in the fully open position.
[0021] Example 4: The difference between this example and Example 1 is that the lower cylinder head conversion connection assembly 1.1 is provided with a lower oil port, and a lower cylinder plug 1.16 is installed at the lower oil port. The lower oil port is connected to the lower hydraulic chamber. Pressurizing the lower hydraulic chamber through the lower oil port can replace the spring and realize the emergency shut-off of the ground safety valve 2.
[0022] Example 5: The difference between this example and Example 1 is that the bottom of the lower cylinder head conversion connection assembly 1.1 has a conversion connection structure, including but not limited to a threaded connection, for establishing a reliable connection with the top connection end of the ground safety valve 2.
[0023] Example 6: The difference between this example and Example 1 is that a piston seal 1.11 and a wear-resistant ring 1.12 are installed between the piston 1.4 and the cylinder 1.3. This not only achieves a reliable dynamic seal, but also straightens the piston, making the stroke smooth and reducing wear, thus extending the product's service life.
[0024] In summary, this device connects to the upper part of the safety valve via a connecting block, and pressurizes the upper oil port to achieve emergency opening of the safety valve. This ensures that production capacity can be maintained in the event of a safety valve failure at the oilfield site, allowing production to continue until maintenance work can commence. Pressurizing the lower oil port enables emergency shut-off of the safety valve, ensuring safe production at the oilfield site in the event of spring failure. The safety valve's on / off status can be continuously monitored through the observation port on the lower cylinder head connection device, and remote monitoring can be achieved by combining it with a proximity switch (sensor). An optional indicator rod is installed on the top, making on-site monitoring of the safety valve's on / off status more convenient and visible.
[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A hydraulically operated auxiliary device for a surface safety valve of an oil wellhead, comprising a device body (1), a surface safety valve (2), and a connecting block (3), characterized in that: The device body (1) is connected to the indicator rod on the driver of the ground safety valve (2) via the connecting block (3); The device body (1) includes a lower cylinder head conversion connection assembly (1.1), a cylinder body (1.3), an upper cylinder head (1.5), a piston (1.4), an indicator rod (1.7), and a piston rod (1.2). The lower cylinder head conversion connection assembly (1.1) is installed at the bottom end of the cylinder body (1.3), the upper cylinder head (1.5) is installed at the top end of the cylinder body (1.3), the piston (1.4) is installed inside the cylinder body (1.3), and the piston rod (1.2) is installed between the piston (1.4) and the lower cylinder head conversion connection assembly (1.1). 1) Inside, the indicator rod (1.7) is installed inside the upper cylinder head (1.5), a lower rod seal (1.15) is installed between the lower cylinder head conversion connection assembly (1.1) and the piston rod (1.2), a lower cylinder seal (1.14) is installed between the lower cylinder head conversion connection assembly (1.1) and the cylinder body (1.3), an upper rod seal (1.9) is installed between the upper cylinder head (1.5) and the indicator rod (1.7), and an upper cylinder seal (1.10) is installed between the upper cylinder head (1.5) and the cylinder body (1.3).
2. The auxiliary hydraulic operating device for the surface safety valve of the wellhead as described in claim 1, characterized in that: The lower cylinder head conversion connection assembly (1.1) has a lower observation port on its surface.
3. The auxiliary hydraulic operating device for the surface safety valve of the wellhead as described in claim 1, characterized in that: The upper cylinder head (1.5) is provided with an upper oil port, and an upper cylinder plug (1.6) is installed on the upper oil port. The upper oil port is connected to the upper hydraulic chamber.
4. The auxiliary hydraulic operating device for the surface safety valve of the wellhead as described in claim 1, characterized in that: The lower cylinder head conversion connection assembly (1.1) is provided with a lower oil port, and a lower cylinder plug (1.16) is installed at the lower oil port. The lower oil port is connected to the lower hydraulic chamber.
5. The auxiliary hydraulic operating device for the surface safety valve of the wellhead as described in claim 1, characterized in that: The lower cylinder head conversion connection assembly (1.1) has a conversion connection structure at the bottom, including but not limited to threaded connection.
6. The auxiliary hydraulic operating device for the surface safety valve of the wellhead as described in claim 1, characterized in that: A piston seal (1.11) and a wear ring (1.12) are installed between the piston (1.4) and the cylinder (1.3).