API 5CT L80 EUE Tubing
API 5CT L80 EUE Tubing is a critical tubular product utilized in oil and gas field development to transport crude oil or natural gas from the subsurface formation to the surface. It falls under Group 2 steel grades within the API Spec 5CT standard and is specifically engineered for "Sour Service" (acidic environments). Its defining characteristic is its controlled strength and hardness, which enable it to effectively resist stress cracking induced by hydrogen sulfide (H2S).
EUE (External Upset End) refers to a connection type featuring an "externally thickened joint." Prior to threading, the pipe ends undergo an upsetting process, resulting in a wall thickness at the end that is greater than that of the pipe body. Consequently, even after the threads are cut, the strength at the joint remains superior to that of the pipe body, thereby ensuring the reliability of the connection.
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API 5CT L80 EUE Tubing Specification
| Item | Requirement |
|---|---|
| Grade | L80 (L80-1, L80-9Cr, L80-13Cr) |
| Connection | EUE (External Upset End) |
| Process | Seamless |
| Heat Treatment | Full-body Quenched & Tempered |
| Threading | In accordance with API Spec 5B |
| Color Band | One Red Band |
Chemical Composition (Weight Percentage, %)
| Element | L80-1 | L80-9Cr | L80-13Cr |
|---|---|---|---|
| C (Carbon) | 0.20–0.30 | 0.18–0.30 | 0.12–0.30 |
| Si (Silicon) | ≤1.00 | ≤1.00 | ≤1.00 |
| Mn (Manganese) | 0.25–1.00 | 0.25–1.00 | 0.25–1.00 |
| P (Phosphorus) | ≤0.020 | ≤0.020 | ≤0.020 |
| S (Sulfur) | ≤0.010 | ≤0.010 | ≤0.010 |
| Cr (Chromium) | - | 8.0–10.0 | 12.0–14.0 |
| Mo (Molybdenum) | - | - | - |
Mechanical Properties
| Property | Requirement |
|---|---|
| Yield Strength | 552–621 MPa (minimum 552 MPa) |
| Tensile Strength | ≥655 MPa |
| Elongation | Determined based on outer diameter and wall thickness, typically ≥18% |
| Hardness | ≤241 HB (Brinell Hardness) |
| Microstructure | Tempered sorbite, fine and uniform grain structure |
Dimensions and Weight Chart - EUE Tubing
| Nominal OD | Weight (lb/ft) | Wall Thickness (mm) | Inner Diameter (mm) | Drift Diameter (mm) | Coupling OD (mm) |
|---|---|---|---|---|---|
| 2-3/8" | 4.70 | 4.83 | 50.67 | 48.29 | 77.80 |
| 2-7/8" | 6.50 | 5.51 | 62.00 | 59.61 | 93.17 |
| 3-1/2" | 9.30 | 6.45 | 76.00 | 72.82 | 114.30 |
| 4-1/2" | 12.75 | 6.88 | 101.60 | 98.42 | 141.30 |
Surface Treatment
Coating: The entire tubing body is coated with clear varnish or black paint to prevent atmospheric corrosion during transportation and storage.
Thread Compound: API standard thread compound (sealing lubricant) is applied to thread areas to prevent galling during make-up and protect against rust.
Thread Protectors: Plastic or steel-plastic composite thread protectors are installed on both ends to prevent thread damage during handling.
Internal Coating (Optional): For severe corrosive environments, the inner wall can be treated with epoxy or ceramic coating for enhanced corrosion resistance.
Inspection for L80 EUE Tubing
To ensure safety in H₂S environments, inspection requirements are more stringent than for standard tubing:
Non-Destructive Testing (NDT):
EMI (Electromagnetic Inspection): Full-body defect detection.
UT (Ultrasonic Testing): Detection of internal and external longitudinal, transverse flaws, and wall thickness measurement.
MPI (Magnetic Particle Inspection): Specifically used to detect surface micro-cracks at pipe ends and connections.
Hydrostatic Test: Each tube must undergo a pressure-holding test, with test pressure calculated according to API specifications, and held for at least 5 seconds.
Hardness Test: A critical inspection for L80 tubing; samples are tested for full-wall hardness distribution, ensuring values do not exceed 23 HRC.
Drift Test: A standard drift gauge is passed through the entire tube to ensure no internal restriction or diameter reduction.
Thread Inspection: Thread gauges are used to verify pitch, taper, thread height, and close tolerance dimensions.
Dimensional Inspection: Includes checks on length, outer diameter tolerance, wall thickness uniformity, and straightness.
GNEE API 5CT L80 EUE Tubing Process line
GNEE API 5CT L80 EUE Tubing factory equipments
GNEE API 5CT L80 EUE Tubing test equipments
GNEE API 5CT L80 EUE Tubing certificate
FAQ
What is the full form of EUE tubing?
EUE stands for "External Upset End."
It is a connection structure used for tubing; it enhances connection strength and sealing performance by thickening the ends of the pipe body. It is commonly utilized for connecting pipe strings in high-pressure and high-stress environments within oil and natural gas wells.
What are the different grades of tubing?
Common steel grades for oilfield tubing primarily include J55, K55, L80, and P110. These grades are defined by the American Petroleum Institute (API) within the API 5CT standard and serve to distinguish tubing based on varying strength levels and suitability for specific operating environments.
J55: Features a minimum yield strength of 55,000 psi and is suitable for conventional shallow wells or low-stress environments.
K55: An upgraded version of J55, characterized by stricter control over chemical composition and offering more stable performance.
L80: Features a minimum yield strength of 80,000 psi and is categorized into L80-1, L80-9Cr, and L80-13Cr; the latter two contain chromium, providing resistance to H₂S corrosion and making them suitable for acidic environments.
P110: Features a minimum yield strength of 110,000 psi; it is a high-strength grade utilized in deep wells or high-pressure wells.
The selection of these steel grades is determined by specific operating conditions, such as well depth, pressure, and the corrosivity of the well fluids.
What are the different types of API tubing threads?
API tubing threads are primarily classified into two categories: round threads and buttress threads. Both are designed in accordance with the API Spec 5B standard.
Round Threads: Characterized by a 60° thread profile angle and a taper of 1:16, these are subdivided into Non-Upset (TBG / NUE) and External Upset (UP TBG / EUE) types. They rely on the thread flanks for sealing and are suitable for medium-to-low pressure wells.
Buttress Threads: Offering superior structural strength and sealing integrity, these possess high load-bearing capacity and are suitable for demanding operating conditions, such as deep wells and high-pressure environments.
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