The API external-upset-end (EUE) tubing pipe is broadly used due to the fact that is a good, serviceable interconnection in the majority of wells.
Without the need of modifying the actual thread shape, the joint dimension will increase because of upsetting procedure. The EUE joint features a designed joint strength in tension and pressure strength much higher than that of the pipe overall body and, as a result, is considered a 100% joint effective connection.
To enhance seal efficiency of API EUE tubing in high-pressure system, a grooved coupling, which accepts nonmetallic seal rings, is quite often applied in the coupling (see API Spec. 5CT SR 13).
API EUE joints come in OD sizes of 1.050 to 4.500 inch.
| Parameters | Value | |
|---|---|---|
| Material | J55, K55, N80, N80Q, L80, P110, other grade available as your requirement | |
| Outer Diameter | 2-3/8"~4-1/2" (73.02~114.3mm) | |
| Wall Thickness | 4.83~16mm | |
| Forms of Thread | EUE, NUE and Integral-joint | |
| Length Range | R1(20~24ft), R2(28~32ft) | |
| MTR | accordance with API Specification 5CT |
Tolerances
| Parameters | Value | |
|---|---|---|
| Outside diameter | +-0.031 inch (0.79mm) | |
| Wall thickness | -12.5%, positive deviations are limited by pipe weight | |
| Weight Deviation | +6.5% /-3.5% |
Mechanical Properties
| Grade | (PSI/MPa) | Yield Strenght (PSI/MPa) | ||
|---|---|---|---|---|
| H-40 | No less than 60000(414) | Between 40000 (276) ~ 80000 (552) | ||
| J-55 | No less than 75000 (517) | Between 55000 (379) ~ 80000 (552) | ||
| N-80 | No less than 100000 (689) | Between 80000 (552) ~ 110000 (758) | ||
| P-110 | No less than 125000 (862) | Between 110000 (758) ~ 140000 (965) |
Inspection
Physical properties are checked and each length hydrostatically tested, normally to only 3,000 psi in the plain end (unthreaded) condition. The following are also checked:
Dimensions
Weights
Straightness
Lengths
Part of this inspection is to drift all lengths.
Despite all the American Petroleum Institute (API) specifications and testing, some tubing defects are still found after delivery; thus, some operators do further inspection.
Inspection Method
Size and surface inspection
NDT and pressure test and third party certication
Hydrostatic
Drifting test
Physical and chemicail analysis
Hardness and pressure test.
Electromagnetic
Magnetic particle
Ultrasonic
Dimensions and Weight
sizes | ODD | weight | wtt | Type of end | |||||||||||
1 | 2 | NU kg/m | EU kg/m | IJ kg/m | |||||||||||
NU | EU | IJ | |||||||||||||
H40 | J55 | L80 | N80 1¸Qàà | C90 | T95 | P110 | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
2-3/82-3/82-3/8 | 4.004.605.80 | -4.705.95 | — | 60.3260.3260.32 | 5.956.858.63 | -6.998.85 | — | 4.244.836.45 | PUPNU- | PNPNU- | PNPNUPNU | PNPNUPNU | PNPNUPNU | PNPNUPNU | -PNUPNU |
2-7/82-7/82-7/8 | 6.407.808.60 | 6.507.908.70 | — | 73.0273.0273.02 | 9.5211.6112.80 | 9.6711.7612.95 | — | 5.517.017.82 | PNU– | PNU– | PNUPNUPNU | PNUPNUPNU | PNUPNUPNU | PNUPNUPNU | PNUPNUPNU |
3-1/23-1/23-1/2 | 7.709.2010.20 | -9.30- | — | 88.9088.9088.90 | 11.4613.6915.18 | -13.84- | — | 5.496.457.34 | PNPNUPN | PNPNUPN | PNPNUPN | PNPNUPN | PNPNUPN | PNPNUPN | -PNU- |
444 | 9.5010.7013.20 | -11.00- | — | 101.60101.60101.60 | 14.14-19.64 | -16.37- | — | 5.746.658.38 | PNPU- | PNPU- | PNPUP | PNPU- | PNPUP | PNPUP | — |
4-1/24-1/2 | 12.6015.20 | 12.75- | – | 114.30114.30 | 18.7522.62 | 18.97- | – | 6.888.56 | PNU- | PNU- | PNUP | PNU- | PNUP | PNUP | – |
4-1/24-1/24-1/2 | 17.0018.9021.50 | — | — | 114.30114.30114.30 | 25.3028.1332.00 | — | — | 9.6510.9212.70 | — | — | PPP | — | PPP | PPP | — |
P——Plain end;N—Non-upset threaded and coupled;U—External upset threaded and coupled;I—insert joint. | |||||||||||||||
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