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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
In oil and gas transportation and production systems, various pipes and accessories are critical to ensuring efficient operation. Among them, seamless steel pipes are widely used for fluid transmission, while tubing pup joints serve as essential accessories in downhole operations. These pup joints allow for flexible length adjustment of the tubing string to accommodate different well depths and operational requirements.
Based on their structure and function, tubing pup joints can be categorized into three main types: double male pup joints, conversion pup joints, and adjustable pup joints.
Super Steel Manufacturing Co.,Ltd is professional tubing pup joints manufacturer, for more details, please contact:sales@super-steels.com
1. Double Male Pup Joints
These joints feature external threads on both ends and come in various configurations, including:
External-upset to non-upset ends
External-upset to external-upset ends
Equal-diameter ends
Non-upset reducing joints
Advantages:
High Strength & Simple Design: The all-male threaded design provides strong pressure resistance and is suitable for high-load operations.
Quick Assembly: Easily connects to standard couplings of the same thread size without the need for transition fittings.
Applications:
Drilling Measurement: Quickly extend or shorten the pipe string to match the required measurement depth.
Well Completion: Used to precisely adjust tubing length and align with wellhead equipment, aiding in the formation of a stable well structure in conjunction with casing pipes.
2. Conversion Pup Joints
These have one male (external) and one female (internal) threaded end, enabling seamless conversion between different types of connections.
Advantages:
Flexible Compatibility: Enables direct connection between male-threaded tubing and female-threaded tools or couplings, eliminating the need for extra adapters.
Reduced Inventory: One joint can support multiple interface types, reducing the variety and quantity of conversion components needed on site.
Applications:
Downhole Tool Integration: Ideal for connecting measuring instruments, core samplers, and other tools to standard tubing.
Process Streamlining: Helps reduce the number of joints, enabling a more compact pipe layout and improving compatibility with OCTG systems.
3. Adjustable Pup Joints
Designed with a non-fixed length tailored to project requirements, these joints typically have one male and one female end and are compatible with most common configurations.
Advantages:
On-Site Length Customization: Allows precise adjustment of the tubing string length at the well site to match operational needs, such as specific depths or tight wellhead space.
Fewer Accessories Needed: Reduces the necessity of carrying multiple pup joints of various fixed lengths, enabling field teams to make real-time adjustments.
Applications:
Precision Depth Control: Commonly used in operations like logging and testing that demand high depth accuracy.
Tight-Space Wellhead Scenarios: Facilitates quick adjustment to avoid stacking excess tubing and optimize the pipe string layout.
Selection Suggestion
|
Element |
recommendation |
|
Load level |
Select the corresponding level of pup joint material and thread sealing form according to the maximum working pressure and axial load downhole. For high strength requirements, refer to the material standard of boiler tube. |
|
Thread standard |
Confirm the thread type of the tubing/tool (API, EU, NC, etc.) to ensure that the male/female ends match. |
|
Corrosion resistance |
For wells containing sulfur, CO₂ or H₂S, choose the corresponding corrosion-resistant alloy or anti-corrosion coating. |
|
Length tolerance |
Focus on ±mm tolerance to ensure the accuracy of logging depth and completion position |
|
On-site maintenance |
Adjustable parts should have maintenance space, and regularly check the thread bite and sealing ring status |
Conclusion
In practical engineering applications, the three types of pup joints are often used in combination to achieve an optimal balance of strength, adaptability, and cost-effectiveness. Proper selection and integration of different pup joint types can greatly enhance the operational efficiency and safety of drilling, completion, and logging processes.
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