27/8 L80 Tubing Pup Joints

Introduction to The 27/8" L80 Tubing Pup Joint

When assembling oil well tubing strings, 27/8-inch diameter pup joints, made of L80-grade steel, play an essential connecting role. This often overlooked yet crucial component connects tubing to precisely planned lengths. It ensures precise control of tubing lengths while maintaining string stability and reliability in challenging well conditions.

What is A 27/8" L80 Tubing Pup Joints?

The 27/8" L80 tubing pup joints are short, 27/8-inch diameter tubing made of L80 steel. They feature threaded connections at both ends for quick assembly with the tubing string.

1. Material characteristics of the L80 pup joints

L80 steel has a minimum yield strength of 80,000 psi and offers high toughness, good ductility, wear resistance, and excellent corrosion resistance.

2. Tubing pup joints thread type

Common thread types include EUE (External Upset End) and NUE (Non-Upset End), which can be selected based on different well conditions to ensure connection strength and sealing.

3. 27/8" pup joints length range

Common specifications include 2 ft, 3 ft, 4 ft, 6 ft, 8 ft, and 10 ft, allowing precise adjustment of tubing string length to the wellbore configuration.

Advantages of the 27/8" L80 Tubing Pup Joints

1. High strength

L80 steel has a minimum yield strength of 80,000 psi, capable of withstanding extremely high downhole pressures and loads without failure.

2. Optimal toughness

L80 steel offers excellent ductility and impact resistance, reducing the risk of cracking and failure during downhole operations.

3. Wear resistance

The alloy composition increases hardness and wear resistance, preventing tubing wear and leakage in abrasive well conditions.

4. Corrosion resistance

L80 steel contains elements such as chromium and molybdenum, making it resistant to corrosive media such as hydrogen sulfide and carbon dioxide.

5. Durability

The combination of strength, wear resistance, and corrosion resistance ensures the 27/8" L80 pup joint provides reliable durability over many years of service.

6. Proven industry acceptance

After years of field experience, the 27/8" L80 pup joint has become a standard and reliable key component in oil well construction.

Functions of the 27/8" L80 Tubing Pup Joint

1. Connecting full-length tubing

Thread the pup joint between 30–40 feet of tubing to create a continuous tubing string that reaches the target well depth. The pup joint can be increased or decreased in length to achieve precise drilling.

2. Fine-tuning tubing string length

Finely adjusting the tubing string length allows precise positioning of tubing, packers, logging tools, and other equipment to the planned depth. This optimizes the positioning of downhole components.

3. Compensating for thermal expansion

In high-temperature, deep wells, tubing length can increase significantly due to thermal expansion. The 2 7/8-inch L80 tubing spool provides the necessary slight extension to maintain tubing string integrity despite thermal effects.

4. Facilitating pulling and repair operations

The spool piece facilitates disconnection midway through the tubing string, allowing for quick replacement of damaged tubing sections without removing the entire tubing string.

5. Adjusting wellhead equipment spacing

It creates precisely spaced wellheads by connecting tubing at optimal distances between various components, such as the tubing hanger, choke, and valves.

6. Adjustable sections available

The threaded ends on the 27/8" L80 pup joint allow for easy assembly and disassembly of sections, allowing tubing lengths to be adjusted as needed during initial installation and subsequent workovers.

7. Connecting different pipe sections

They serve as connectors, connecting pipe sections of different diameters or connection methods, creating a smooth transition between mismatched sections.

27/8" L80 Technical Specifications and Applications

1. Manufacturing standards

Strictly adhere to API 5CT standards, ensuring dimensional accuracy, thread quality, and mechanical properties meet international standards.

2. Typical operating conditions

Suitable for complex environments such as medium-depth wells, high-temperature wells, and sour wells.

FAQ

1. What are the differences between the L80 pup joint and the J55 and N80?

Compared to the J55, the L80 offers higher strength and better corrosion resistance, making it suitable for more complex operating conditions.

Compared to the N80, the L80 offers superior resistance to hydrogen sulfide corrosion.

2. Are 27/8" L80 tubing pup joints generally in stock? What is the lead time?

Most manufacturers keep standard lengths of 2–10 feet in stock. If a special length or thread type is required, the typical lead time is 7–15 days.

3. Is the L80 pup joint suitable for sour wells (H₂S environments)?

Yes, L80 material is specifically designed to resist hydrogen sulfide corrosion and complies with NACE MR0175.

However, in highly corrosive or extreme environments, a higher grade of material (such as Cr13 or P110) may be required.

Summary

For assembling oil well tubing strings that reach the target production zone with precise component spacing, the 27/8" L80 tubing pup joint is the ideal choice. The 27/8" L80 tubing pup joint is more than just an auxiliary component for connecting tubing; it is a key factor in ensuring tubing string safety and efficient downhole operations. With its high strength, excellent toughness, wear resistance and corrosion resistance, it can adapt to the most complex well conditions and ensure the safety and durability of oil well construction.