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API 5CT J55/N80 EUE/NUE Seamless Steel Tubing Pipe for Oil Wells - China Suppliers & 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 API 5CT
| Parameter | Details |
|---|---|
| Manufacturing Process | Seamless (SMLS) |
| Executive Standard | API SPEC 5CT, ISO 11960 |
| Grades | J55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, P110 |
| Outer Diameter (OD) | 1.9" – 4 1/2" |
| Wall Thickness | As per API 5CT standard, varies with OD and weight (lbs/ft) |
| Length | R1 (6.10–7.32m), R2 (8.53–9.75m) |
| 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 in oil and gas wells?
Production tubing serves as the main conduit for transporting hydrocarbons (oil, gas, or both) from the downhole reservoir to the surface. It is installed inside the final casing string and acts as a critical barrier preventing produced fluids from leaking into the surrounding environment.
Q
What is the difference between EUE and NUE tubing connections?
EUE (External Upset End) connections feature an enlarged pipe end, which provides greater wall thickness at the threaded area, resulting in higher joint strength. NUE (Non-Upset End) connections have no upset at the pipe end, offering a simpler, lower-cost option. EUE is generally preferred for applications requiring higher tensile and pressure integrity.
Q
Which steel grades are available for OCTG tubing, and how do I choose the right one?
Available grades include J55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, and P110. The selection depends on well conditions such as temperature, pressure, and the presence of corrosive gases (H₂S, CO₂). For example, L80-13Cr is suitable for CO₂-corrosive environments, while C90 and P110 are used in high-pressure wells requiring superior mechanical strength.
Q
What manufacturing standard governs OCTG tubing pipe?
OCTG tubing is manufactured in accordance with API SPEC 5CT and ISO 11960. These standards define the requirements for material grades, dimensions, mechanical properties, inspection methods, and thread connections, ensuring consistent quality and interoperability across the oil and gas industry.
Q
What inspection and testing procedures are applied to tubing pipe before delivery?
Each tubing pipe undergoes a comprehensive inspection process, including: Hydrostatic Testing to verify pressure integrity, Non-Destructive Testing (NDT) to detect surface and subsurface defects, Dimensional Inspection for OD, wall thickness, and length conformance, Tensile Tests to confirm mechanical properties, and Thread Inspection to ensure proper connection fit and performance.
Q
What outer diameter and length ranges are available for OCTG tubing?
OCTG tubing is available in outer diameters ranging from 1.9" to 4 1/2", covering the most common wellbore completion sizes. Standard length ranges are R1 (6.10–7.32 m) and R2 (8.53–9.75 m) as defined by API 5CT. Wall thickness varies according to the specified OD and weight per foot (lbs/ft).