An Overview of casing Pipe materials: J55, K55, N80, L80, and P110
casing pipes are an essential component of Oil and gas production. They are used to protect the wellbore from the pressure of the surrounding environment and to ensure the safe and efficient extraction of oil and gas. There are several different materials used for casing pipes, including J55, K55, N80, L80, and P110.
J55 is a low-cost material that is used in shallow wells and is the most common type of casing pipe. It is made from a low-carbon steel and is relatively easy to work with.
Calculated Mass c | |||||||||||
Nominal Linear Mass T& C b,c | Wall Thick- ness | em, Mass Gain or Loss Due to End Finishing d | |||||||||
Labels a | Outside Diameter | Inside Diameter | Drift Diameter | Plain- end | kg | ||||||
Round Thread | Buttress Thread | ||||||||||
wpe | |||||||||||
D | kg/m | t | D | mm | kg/m | Short | Long | RC | SCC | ||
mm | mm | mm | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
10 3/4 | 32.75 | 273.05 | 48.74 | 7.09 | 258.9 | 254.91 | 46.5 | 13.94 | — | — 15.38 | — 3.03 |
10 3/4 | 40.5 | 273.05 | 60.27 | 8.89 | 255.3 | 251.31 | 57.91 | 11.91 | — | 14.21 | 1.86 |
10 3/4 | 45.5 | 273.05 | 67.71 | 10.16 | 252.7 | 250.82 e 248.77 246.23 246.33 | 65.87 | 11 | — | 14.21 | 1.86 |
10 3/4 | 45.5 | 273.05 | 67.71 | 10.16 | 252.7 | 244.48 e | 65.87 | 11 | — | 13.05 | 0.7 |
10 3/4 | 51 | 273.05 | 75.9 | 11.43 | 250.2 | 244.48 e 243.94 243.94 241.40 241.40 238.86 238.86 234.95 231.80 228.60 | 73.75 | 10.11 | — | 13.05 | 0.7 |
10 3/4 | 51 | 273.05 | 75.9 | 11.43 | 250.2 | 73.75 | 10.16 f | — | 12.25 | –0.09 | |
10 3/4 | 55.5 | 273.05 | 82.59 | 12.57 | 247.9 | 80.75 | 9.3 | — | 12.01 | –0.34 | |
10 3/4 | 55.5 | 273.05 | 82.59 | 12.57 | 247.9 | 80.75 | 9.35 f | — | 12.25 | –0.09 | |
10 3/4 | 55.5 | 273.05 | 82.59 | 12.57 | 247.9 | 80.75 | 9.3 | — | 12.01 | –0.34 | |
10 3/4 | 55.5 | 273.05 | 82.59 | 12.57 | 247.9 | 80.75 | 9.35 f | — | 11.07 | — | |
10 3/4 | 60.7 | 273.05 | 90.33 | 13.84 | 245.4 | 88.47 | 8.42 | — | 10.87 | — | |
10 3/4 | 60.7 | 273.05 | 90.33 | 13.84 | 245.4 | 88.47 | 8.47 f | — | 9.98 | — | |
10 3/4 | 65.7 | 273.05 | 97.77 | 15.11 | 242.8 | 96.12 | 7.54 | — | 9.74 | — | |
10 3/4 | 65.7 | 273.05 | 97.77 | 15.11 | 242.8 | 96.12 | 7.60 f | — | — | — | |
10 3/4 | 73.2 | 273.05 | 108.93 | 17.07 | 238.9 | 107.76 | — | — | — | — | |
10 3/4 | 79.2 | 273.05 | 117.86 | 18.64 | 235.8 | 116.95 | — | — | — | — | |
10 3/4 | 85.3 | 273.05 | 126.94 | 20.24 | 232.6 | 126.19 | — | — | |||
11 3/4 | 42 | 298.45 | 62.5 | 8.46 | 281.5 | 279.40 e 277.50 275.44 272.39 | 62.56 | 13.27 | — | — | — |
11 3/4 | 42 | 298.45 | 62.5 | 8.46 | 281.5 | 269.88 e | 62.56 | 13.27 | — | — 16.04 | — |
11 3/4 | 47 | 298.45 | 69.94 | 9.52 | 279.41 | 269.88 e | 67.83 | 12.42 | — | 14.5 | — |
11 3/4 | 54 | 298.45 | 80.36 | 11.05 | 276.4 | 269.65 | 78.32 | 11.23 | — | 13.12 | — |
11 3/4 | 60 | 298.45 | 89.29 | 12.42 | 273.6 | 269.65 e | 87.61 | 10.17 | — | 13.12 | — |
11 3/4 | 60 | 298.45 | 89.29 | 12.42 | 273.6 | 269.88 e 267.36 264.92 | 87.61 | 9.77 f | — | 13.12 | — |
11 3/4 | 60 | 298.45 | 89.29 | 12.42 | 273.6 | 87.61 | 10.17 | — | 13.12 | — | |
11 3/4 | 60 | 298.45 | 89.29 | 12.42 | 273.6 | 87.61 | 9.77 f | — | — | — | |
11 3/4 | 65 | 298.45 | 96.73 | 13.56 | 271.3 | 95.27 | — | — | — | — | |
11 3/4 | 65 | 298.45 | 96.73 | 13.56 | 271.3 | 95.27 | — | — | — | — | |
11 3/4 | 71 | 298.45 | 105.66 | 14.78 | 268.9 | 103.4 | — | — | — |
K55 is a higher-grade material than J55 and is used in deeper wells. It is made from a medium-carbon steel and is more resistant to corrosion and wear.
N80 is a higher-grade material than K55 and is used in deeper wells. It is made from a high-carbon steel and is more resistant to corrosion and wear.
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L80 is a higher-grade material than N80 and is used in deeper wells. It is made from a high-carbon steel and is more resistant to corrosion and wear.
API 5ct l80 casing Tubing Grade color Codes | ||||
Grade | Grade Type | Number and Color of Bands for Product a with Length ³ 1.8 m | Color(s) for couplings | |
Entire Coupling | Band(s) b, c | |||
1 | 2 | 3 | 4 | 5 |
H40 | — | None or black band at the Manufacturer’s option | None | Same as for pipe |
j55 tubing | — | One bright green | Bright green | None |
J55 Casing | — | One bright green | Bright green | One white |
K55 | — | Two bright green | Bright green | None |
N80 | 1 | One red | Red | None |
N80 | Q | One red, one bright green | Red | Green |
R95 | — | One brown | Brown | None |
L80 | 1 | One red, one brown | Red | One brown |
L80 | 9Cr | One red, one brown, two yellow | None | Two yellow |
L80 | 13Cr | One red, one brown, one yellow | None | One yellow |
C90 | 1 | One purple | Purple | None |
T95 | 1 | One silver | Silver | None |
C110 | — | One white, two brown | White | Two brown |
P110 | — | One white | White | None |
Q125 | 1 | One orange | Orange | None |
a In the case of coupling material, unless otherwise specified in the purchase agreement, the manufacturer’s internal requirements shall govern. | ||||
b special clearance couplings shall also have a black band. | ||||
c Seal-ring couplings shall also have a blue band. |
P110 is the highest-grade material and is used in the deepest wells. It is made from a high-carbon steel and is the most resistant to corrosion and wear.
In conclusion, there are several different materials used for casing pipes, each with its own advantages and disadvantages. Depending on the depth of the well and the environment, the right material should be chosen to ensure the safe and efficient extraction of oil and gas.