Tubing Pup Joint

In the oil and gas drilling industry, tubing pup joints are a critical component in completing wells. Pup joints allow drillers to change drill pipe without having to pull the entire string out of the well. This is a common practice, especially when drilling deep wells. Because of this, tubing pup joints are one of the most important joints in any well.

What is a tubing pup joint?

A pup joint is a pipe with threads, flanges, or fittings on both ends. Tubing pup joints are made from tubing that meets API standards. Full-length forming is used when manufacturing J55, L80, and P110 EUE pup joints, rather than upsetting. This produces an extremely high-quality finished product. Pup joints are suitable for high/low pressure, high temperature, and H2S environments, such as integral pup joints (10-foot long, used to handle fluids at cold working pressure), sour gas pup joints, pressure thread seal straight pipes, and non-pressure thread seal pup joints.

Tubing pup joints are small diameter tubing used with casing to complete oil wells. The pup joint is run in the wellbore and fixed to the casing, and then the production tubing is run over it and connected. This arrangement allows the use of smaller diameter production tubing, which reduces pressure drop and increases production. The pup joint is usually located in the last few feet of the tubing string.

Tubing pup joints are generally made of full-weight seamless tubing, and all stocks used to make tubing pup joints are certified to API standards by independent third-party laboratories before processing. All tubing pup joints are color-coded and marked according to API standards.

Tubing pup joint specifications

1. Name: API 5CT tubing/tubing pup joint with connector
2. Grade: J55/K55 L80/N80 P110 Q125
3. API 5CT tubing/tubing pup joint size: 2.3/8″ 2.7/8″ 3.1/2″ 4″ 4.1/2″
4. Tubing/tubing pup joint thread: EUE and NUE
5. API 5CT tubing/tubing pup joint length: 1FT/3FT/5FT/3.05 meters/10FT

6. Tubing/tubing pup joint packaging: bundled and covered with plastic sheeting

Technical Specifications of Tubing Pup Joint and Crossover:

SIZE / THREAD	GRADES	LENGTH	LENGTH	LENGTH	LENGTH	LENGTH	LENGTH
2 3/8" EUE
2 3/8" EUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" EUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" EUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" EUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE
2 7/8" EUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
3 1/2" EUE
3 1/2" EUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" EUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" EUE
4 1/2" EUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" EUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" EUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" EUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" NUE
2 3/8" NUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" NUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" NUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 3/8" NUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" NUE
2 7/8" NUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" NUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" NUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
2 7/8" NUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
3 1/2" NUE
3 1/2" NUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
3 1/2" NUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
3 1/2" NUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
3 1/2" NUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" NUE
4 1/2" NUE	J55	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" NUE	L80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" NUE	N80	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT
4 1/2" NUE	P110	2 FT	4 FT	6 FT	8 FT	10 FT	12 FT

Tubing pup joint testing and inspection

According to API 5CT, API 5B or customer-specified standards, a strict inspection and testing system is adopted before shipment, including appearance inspection, dimensional inspection, chemical composition inspection, performance test, strength test, tensile test, hardness test, non-destructive testing, hydrostatic test, etc.

Performance Characteristics of Tubing Pup Joints

Mechanical Strength: The pup joint body is engineered to exhibit excellent mechanical strength and overall performance, ensuring reliability under demanding conditions.
Precision Machining: The threads are cut using CNC machines, which guarantees high precision and contributes to an extended lifespan of the joint.
Wear Resistance: The application of phosphate coating or copper plating enhances the joint’s wear resistance, providing durability in various environments.