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API 5CT J55/N80 EUE/NUE Seamless Steel Tubing Pipe for Oil Wells - China Suppliers and Factory
Detailed Description of Tubing Pipe
Production tubing is the pipe string which conveys hydrocarbons to surface. It is set in the final casing string, along with the production casing, is the last barrier preventing produced fluids from entering the environment, which is why the integrity of the tubing is critical. The tubing needs to support its weight, any down hole equipment, and dynamic loads while producing, which means it must have adequate tensile strength. The joints (couplings) are the most important part of the tubing string. We stock standard API connections like EUE (External Upset End), which provides higher joint strength, and NUE (Non-Upset End), and specific premium gas-tight connections for high-pressure gas wells.
Key Parameters for OCTG Tubing Pipe
| Parameter | Details |
|---|---|
| Manufacturing Process | Seamless (SMLS) |
| Executive Standard | API SPEC 5CT ISO 11960 |
| Grades |
|
| Outer Diameter (OD) | 1.9" – 4 1/2" |
| Wall Thickness | As per API 5CT standard, varies with OD and weight (lbs/ft) |
| Length | R1 (6.10–7.32 m) | R2 (8.53–9.75 m) |
| End Finish / Connection | NUE (Non-upset), EUE (External upset), and premium connections |
| Inspection | Hydrostatic Test, NDT, Dimensional Inspection, Tensile Tests, Thread Inspection |
Frequently Asked Questions
Q
What is the primary function of production tubing pipe in oil and gas wells?
Production tubing is the pipe string that conveys hydrocarbons (oil and gas) from the downhole reservoir to the surface. It serves as the last barrier preventing produced fluids from entering the surrounding environment, making its structural integrity absolutely critical for safe well operations.
Q
What grades of OCTG tubing pipe are available?
We supply tubing in a full range of API and corrosion-resistant grades including J55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, and P110. The appropriate grade is selected based on well conditions such as pressure, temperature, and the presence of corrosive gases like CO₂ or H₂S.
Q
What is the difference between EUE and NUE connections?
EUE (External Upset End) connections have an enlarged pipe end that provides greater wall thickness at the joint, resulting in higher joint strength — making them suitable for more demanding well conditions. NUE (Non-Upset End) connections do not have this enlarged end, offering a simpler, cost-effective solution for standard applications. Premium gas-tight connections are also available for high-pressure gas wells.
Q
What manufacturing standard does your tubing pipe comply with?
Our OCTG tubing pipe is manufactured in accordance with API SPEC 5CT and ISO 11960 standards. These internationally recognized standards govern the technical requirements for casing and tubing used in the petroleum and natural gas industries, ensuring consistent quality and performance.
Q
What inspection and quality control processes are applied to the tubing?
Each tubing pipe undergoes a comprehensive inspection process including Hydrostatic Testing, Non-Destructive Testing (NDT), Dimensional Inspection, Tensile Tests, and Thread Inspection. These measures ensure that every pipe meets the required mechanical properties and dimensional tolerances before delivery.
Q
What outer diameter and length ranges are available for OCTG tubing?
Our tubing is available in outer diameters (OD) ranging from 1.9" to 4 1/2", covering the most common sizes used in production wells. Length options include R1 (6.10–7.32 m) and R2 (8.53–9.75 m) ranges as defined by API 5CT, with wall thickness varying according to the OD and nominal weight (lbs/ft).