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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
| Parameter | Details |
|---|---|
| Manufacturing Process | SMLS Seamless |
| Executive Standard | API API SPEC 5CT | ISO 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) | 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 conveying hydrocarbons from the reservoir to the surface. It is installed inside the final casing string and acts as the last barrier preventing produced fluids from escaping into the environment, making its integrity absolutely critical for safe well operation.
Q
What grades of OCTG tubing pipe are available?
We supply tubing in a comprehensive range of API 5CT grades including J55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, and P110. Each grade is selected based on well conditions such as temperature, pressure, and corrosive environment requirements.
Q
What is the difference between EUE and NUE tubing connections?
EUE (External Upset End) connections feature an enlarged pipe end that provides greater thread engagement and higher joint strength, making them suitable for heavier-duty applications. NUE (Non-Upset End) connections have a standard pipe body diameter and are commonly used in lighter-load, lower-pressure well environments.
Q
What outer diameter range does your tubing pipe cover?
Our OCTG tubing pipe covers an outer diameter (OD) range from 1.9 inches to 4 1/2 inches, in accordance with API SPEC 5CT and ISO 11960 standards. Wall thickness varies depending on the OD and the specified weight per foot (lbs/ft).
Q
What quality inspections are performed on the tubing pipe?
Each tubing pipe undergoes rigorous quality control, including Hydrostatic Testing, Non-Destructive Testing (NDT), Dimensional Inspection, Tensile Tests, and Thread Inspection. These inspections ensure the product meets API SPEC 5CT and ISO 11960 requirements before delivery.
Q
Are premium connections available for high-pressure gas wells?
Yes. In addition to standard API connections (EUE and NUE), we offer specific premium gas-tight connections designed for high-pressure gas wells. These premium connections provide superior sealing performance and are engineered to withstand extreme downhole conditions where standard connections may not be sufficient.