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China API 5CT J55/N80 Seamless Steel Tubing Pipe Suppliers & Factory for Oil Wells Transport
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 | 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 an oil and gas well?
Production tubing is the pipe string that conveys hydrocarbons (oil, gas, or both) from the reservoir to the surface. It serves as the last barrier between produced fluids and the environment, making its integrity essential for safe and efficient well operations.
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 engineered for specific downhole conditions such as corrosive environments, high pressure, or high temperature applications.
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 — making them suitable for deeper wells and more demanding applications. NUE (Non-Upset End) connections have a uniform wall thickness and are used in lighter-duty or shallower well conditions. Both comply with API SPEC 5CT standards.
Q
What manufacturing process is used for OCTG tubing pipe?
Our OCTG tubing is manufactured using the Seamless (SMLS) process, which produces pipes without a welded seam. This results in superior mechanical properties, uniform wall thickness, and higher resistance to pressure — all critical requirements for downhole tubing applications.
Q
What inspection and quality control procedures are applied to the tubing?
Each tubing pipe undergoes a comprehensive quality inspection process that includes Hydrostatic Testing, Non-Destructive Testing (NDT), Dimensional Inspection, Tensile Tests, and Thread Inspection. These procedures ensure every pipe meets the strict requirements of API SPEC 5CT and ISO 11960 standards before delivery.
Q
What outer diameter (OD) range is available for OCTG tubing pipe?
Our OCTG tubing is available in outer diameters ranging from 1.9 inches to 4½ inches, covering the most common sizes used in oil and gas production wells. Wall thickness varies according to the API 5CT standard, depending on the OD and the specified weight per foot (lbs/ft).