Supplier of API-5CT Couplings, Casing Pipe and Tubing Pipe, Reaching The Most Stringent Standards.

API-5CT K55 Casing Pipe

oilfield api casing pipe k55

oilfield api casing pipe k55

API-5CT K55 oilfield casing pipe is very similar to J55, there is no significant difference in the chemical composition and yield strength, however the ultimate tensile strength of K55 is higher than J55 steel, K55/J55 are 655MPa and 517MPa respectively.

K55 has better mechanical and thermal fatigue resistance and crack resistance than K55. For a thermal production well, the heavy wall K55 casing is appropriate instead of J55 casing. The former has a better thermal fatigue resistance property than the latter.

In present sales, the selling price of theses two types is generally kept the same,  their application is very similar. In the oil drilling, K55 API 5CT casing or tubing is a relatively common type.

 

Specifications

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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

Size Weight Outside Diameter Wall Thickness End Finish
Grade
in mm in mm J55K55 L80 N80 C90T95 P110
4 1/2 9.50 4.500 114.3 0.205 5.21 PS
10.50 0.224 5.69 PSB
11.60 0.250 6.35 PSLB PLB PLB PLB PLB
13.50 0.290 7.37 PLB PLB PLB PLB
15.10 0.337 9.56 PLB
5 11.50 5.00 127.00 0.220 5.59 PS
13.00 0.253 6.43 PSLB
15.00 0.296 7.52 PSLB PLB PLB PLBE PLB
18.00 0.362 9.19 PLB PLB PLBE PLB
21.40 0.437 11.10 PLB PLB PLB PLB
23.20 0.478 12.14 PLB
24.10 0.500 12.70 PLB
5 1/2 14.00 5.500 139.7 0.244 6.20 PS
15.50 0.275 6.98 PSLB
17.00 0.304 7.72 PSLB PLB PLB PLBE PLB
20.00 0.361 9.17 PLB PLB PLBE PLB
23.00 0.415 10.54 PLB PLB PLBE PLB
6 5/8 20.00 6.625 168.28 0.288 7.32 PSLB
24.00 0.352 8.94 PSLB PLB PLB PLBE PLB
28.00 0.417 10.59 PLB PLB PLBE PLB
32.00 0.475 12.06 PLB PLB PLBE PLB
7 17.00 7.00 177.80 0.231 5.87
20.00 0.272 6.91 PS
23.00 0.317 8.05 PSLB PLB PLB PLBE
26.00 0.362 9.19 PSLB PLB PLB PLBE PLB
29.00 0.408 10.36 PLB PLB PLBE PLB
32.00 0.453 11.51 PLB PLB PLBE PLB
35.00 0.498 12.65 PLB PLB PLBE PLB
38.00 0.540 13.72 PLB PLB PLBE PLB
7 5/8 24.00 7.625 193.68 0.300 7.62
26.40 0.328 8.33 PSLB PLB PLB PLBE PLB
29.70 0.375 9.52 PLB PLB PLBE PLB
33.70 0.430 10.92 PLB PLB PLBE PLB
39.00 0.500 12.70 PLB PLB PLBE PLB
42.80 0.562 14.27 PLB PLB PLB PLB
45.30 0.595 15.11 PLB PLB PLB PLB
47.10 0.625 15.88 PLB PLB PLB PLB
8 5/8 24.00 8.625 219.08 0.264 6.71 PS
28.00 0.304 7.72
32.00 0.352 8.94 PSLB
36.00 0.400 10.16 PSLB PLB PLB PLBE PLB
40.00 0.450 11.43 PLB PLB PLBE PLB
44.00 0.500 12.70 PLB PLB PLBE PLB
49.00 0.557 14.15 PLB PLB PLBE PLB
9 5/8 32.30 9.625 244.48 0.312 7.92
36.00 0.352 8.94 PSLB
40.00 0.395 10.03 PSLB PLB PLB PLBE
43.50 0.435 11.05 PLB PLB PLBE PLB
47.00 0.472 11.99 PLB PLB PLBE PLB
53.50 0.545 13.84 PLB PLB PLBE PLB
58.40 0.595 15.11 PLB PLB PLB PLB
10 3/4 32.75 10.75 273.05 0.279 7.09
40.50 0.350 8.89 PSB
15.50 0.400 10.16 PSB
51.00 0.450 11.43 PSB PSB PSB PSBE PSB
55.50 0.495 12.57 PSB PSB PSBE PSB
60.70 0.545 13.84 PSBE PSB
65.70 0.595 15.11 PSB PSB
13 3/8 48.00 13.375 339.73 0.330 8.38
54.50 0.380 9.65 PSB
61.00 0.430 10.92 PSB
68.00 0.480 12.19 PSB PSB PSB PSB PSB
72.00 0.514 13.06 PSB PSB PSB PSB
16 65.00 16 406.40 0.375 9.53
75.00 0.438 11.13 PSB
84.00 0.495 12.57 PSB
109.00 0.656 16.66 P P P P
18 5/8 87.50 18.625 473.08 0.435 11.05 PSB
20 94.00 20 508.00 0.438 11.13 PSLB
106.50 0.500 12.70 PSLB
133.00 0.635 16.13 PSLB

Chemical Composition, mass fraction(%) – API 5CT 8th Edition

Chemical Composition

Chemical Composition

Tensile and Hardness requirements- API 5CT 8th Edition

Tensile Hardness

Tensile Hardness