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API 5CT Oil Tubing basically means a tube running inside casing and serves as a channel through which oil and gas is produced. It must be adequately strong enough to resist loads and deformations associated with production and workovers. It should also be sized to support the expected rates of production of oil and gas. If the tube is too small, it would restrict production and subsequent economic performance of the well. If too large, however, it will have an economic impact beyond the cost of the tubing string itself, because the tubing size will influence the overall casing design of the well.
Standard and Grades: API 5CT J55 / K55, N80-1, N80Q, C90, T95, P110, Q125 and 13Cr
Tubing Pipe dimensions range: 1.0”, 1.315”, 1.66”, 1.9”, 2.063 ”, 2 3/8”, 3 1/2”,4 1 /2”
Length: R1, R2, R3
Connection: EU, NU, IJ, Premium Connection (VAM TOP, NEW VAM, PH-6)
•H40 (414): Shallow wells, low pressure, low cost
• J55/K55 (552): Medium-shallow wells, conventional wells, most commonly used in China
• N80 (758): Medium-deep wells, high pressure, general-purpose mainstay
• L80 (758): H₂S/SSC resistant, for acidic wells
• C90/T95 (931/1034): Deep wells, sulfur resistant, high pressure
• P110 (1103): Ultra-deep wells, high pressure, complex working conditions
• Q125/V150: Extra-deep wells, ultra-high pressure
Grade | C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≤ | Ni≤ | Cu≤ | Mo≤ | V≤ | Als≤ | ||
API 5CT H40 | 0.030 | 0.030 | |||||||||||
API 5CT J55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 | ||
API 5CT K55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 | ||
API 5CT N80 | 0.34-0.38 | 0.20-0.35 | 1.45-1.70 | 0.020 | 0.015 | 0.15 | / | / | / | 0.11-0.16 | 0.020 | ||
API 5CT L80 | 0.15-0.22 | 1.00 | 0.25-1.00 | 0.020 | 0.010 | 12.0-14.0 | 0.20 | 0.20 | / | / | 0.020 | ||
API 5CT P110 | 0.26-035 | 0.17-0.37 | 0.40-0.70 | 0.020 | 0.010 | 0.80-1.10 | 0.20 | 0.20 | 0.15-0.25 | 0.08 | 0.020 | ||
API 5CT Oil Tubing Grade Physical Strength
Steel Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) |
API 5CT H40 | 276-552 | 414- 60,000 psi min |
API 5CT J55 | 379-552 | ≥517 |
API 5CT K55 | ≥655 | ≥517 |
API 5CT N80 | 552-758 | ≥689 |
API 5CT L80 | 552-655 | ≥655 |
API 5CT P110 | 758-965 | ≥862 |
API 5CT oil tubing standard is all over the world unified standard, and depend on different project condition, the material and size are totally different,there have API SCT standard to help customer choose correct size and thickness
API 5CT Oil Tubing coupling Color
In order to difference API 5CT Oil Tubing for different material, during production stage, each factroy will use API 5CT tubing couplings are color-coded for quick identification of steel grades. this will help we orginzed material when seeing coulping. In normal project, green for J55, red for N80, red with brown band for L80, and white for P110, K55 is most popular used material. these color marking ensures easy recognition and prevents material mix-up in oilfield operations.Some items, We will painting full body of pipe, Sometime,we only painting end of pipe. this will depend on customer request
Inspection before shiping
1.Inspector will do Visual inspection for pipe surface and Size checking
2. NDT test,this is one of most important step before delivery, NTD test including Magnetic particle, Ultrasonic Test, Hydrostatic Test. and this is API 5CT standard request.
3.Chemical analysis and Mechanical test on Charpy impact test,tensile strength, yield strength and elongation. This is vital point and test report submit to customer get approval of shiping.
4.In order to ensure the pipe could connect sucessfully, we will do Thread ends check with thread gauge and coupling check before package
Package
Bundle by steel strip: this is most popular package for API tubing
Wooden carton, If LCL shiping and customer special request, we will do wooden carton package, this is more safety packing choice.
