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API 5CT J55/N80 EUE/NUE Seamless Steel Tubing Pipe for Oil Wells - China Suppliers & Factory for Optimal Reliability
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 | SMLS Seamless |
| Executive Standard | API 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 (6.10–7.32 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 in oil and gas wells?
Production tubing is the pipe string used to convey hydrocarbons from the reservoir to the surface. It serves as one of the last barriers preventing produced fluids from entering the surrounding environment, making its structural integrity critically important throughout the well's production life.
Q
What grades of OCTG tubing pipe are available?
We supply tubing in a full range of API and premium grades, including J55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, and P110. Each grade is selected based on downhole conditions such as temperature, pressure, and corrosive environment.
Q
What is the difference between EUE and NUE connections?
EUE (External Upset End) connections feature an increased wall thickness at the pipe ends, resulting in higher joint strength and are preferred for demanding applications. NUE (Non-Upset End) connections have no wall upset, offering a simpler and more economical solution for standard well conditions. Premium gas-tight connections are also available for high-pressure gas wells.
Q
What outer diameter (OD) range does your tubing pipe cover?
Our OCTG tubing pipe is available in outer diameters ranging from 1.9 inches to 4½ inches, covering the full spectrum of standard API sizes as specified in API SPEC 5CT and ISO 11960.
Q
What quality inspections are performed on the tubing pipe?
Each tubing pipe undergoes a comprehensive inspection process, including Hydrostatic Testing, Non-Destructive Testing (NDT), Dimensional Inspection, Tensile Tests, and Thread Inspection. These ensure full compliance with API SPEC 5CT and ISO 11960 standards before delivery.
Q
What standard lengths are available for OCTG tubing pipe?
Tubing pipe is supplied in two standard API length ranges: R1 (6.10–7.32 m) and R2 (8.53–9.75 m). The appropriate length range is selected based on the specific requirements of the well design and operational logistics.