API 5CT Casing Pipe is a core protective pipe run into the well after oil well drilling, which strictly complies with the API 5CT standard and is divided into surface casing, intermediate casing, production casing and other types. Its core function is to fix the wellbore, isolate different formations (such as oil layer, water layer, gas layer), prevent wellbore collapse and formation fluid channeling, protect wellbore safety, and lay the foundation for subsequent oil and gas production operations. The product adopts high-toughness and collapse-resistant steel, and can be customized with different steel grades (such as J55, K55, N80, P110, etc.) and specifications according to well depth, formation pressure and geological complexity, adapting to various types of oil wells such as vertical wells, deviated wells and horizontal wells. It is the "protective shell" for the safe and stable production of oil and gas wells.
Description
API SPEC 5CT well casing is utilized in fixing the well wall or down hole, which has wider diameters. API SPEC 5CT can be divided into conductor casing, technical casing and oil casing.
API 5CT Casing | Range 1 | Range 2 | Range 3 |
4.88~7.62 | 7.62~10.36 | 10.36~14.63 |
Casing&tubing and their colors:
Specification
Labels | OD(mm) | WT(mm) | J55/K55 | N80 | L80 | C90/T95 | P110 | Q125 |
4 1/2 | 9.5 | 114.3 | 5.21 | PS | - | - | - | - | - |
10.5 | 114.3 | 5.69 | PSB | - | - | - | - | - |
11.6 | 114.3 | 6.36 | PSLB | PLB | PLB | PLB | PLB | - |
13.5 | 114.3 | 7.37 | - | PLB | PLB | PLB | PLB | - |
15.1 | 114.3 | 8.56 | - | - | - | - | PLB | PLB |
5 | 11.5 | 127 | 5.59 | PS | - | - | - | - | - |
13 | 6.43 | PSLB | - | - | - | - | - |
15 | 7.52 | PSLBE | PLBE | PLBE | PLBE | PLBE | - |
18 | 9.19 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
21.4 | 11.10 | - | PLB | PLB | PLB | PLB | PLB |
23.2 | 12.14 | - | PLB | PLB | PLB | PLB | PLB |
24.1 | 12.7 | - | PLB | PLB | PLB | PLB | PLB |
5 1/2 | 14 | 139.7 | 6.20 | PS | - | - | - | - | - |
15.5 | 6.98 | PSLBE | - | - | - | - | - |
17 | 7.72 | PSLBE | PLBE | PLBE | PLBE | PLBE | - |
20 | 9.17 | - | PLBE | PLBE | PLBE | PLBE | - |
23 | 10.54 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
26.8 | 12.7 | - | - | - | P | - | - |
29.7 | 14.27 | - | - | - | P | - | - |
32.6 | 15.88 | - | - | - | P | - | - |
35.3 | 17.45 | - | - | - | P | - | - |
38 | 19.05 | - | - | - | P | - | - |
40.5 | 20.62 | - | - | - | P | - | - |
43.1 | 64.14 | - | - | - | P | - | - |
6 5/8 | 20 | 168.28 | 7.32 | PSLB |
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24 | 8.94 | PSLBE | PLBE | PLBE | PLBE | PLBE | - |
28 | 10.59 | - | PLBE | PLBE | PLBE | PLBE | - |
32 | 12.06 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
7 | 20 | 177.8 | 6.91 | PS |
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23 | 8.05 | PSLBE | PLBE | PLBE | PLBE | - | - |
26 | 9.19 | PSLBE | PLBE | PLBE | PLBE | PLBE | - |
29 | 10.6 |
| PLBE | PLBE | PLBE | PLBE |
|
32 | 11.51 |
| PLBE | PLBE | PLBE | PLBE |
|
35 | 12.65 |
| PLBE | PLBE | PLBE | PLBE | PLBE |
38 | 13.72 |
| PLBE | PLBE | PLBE | PLBE | PLBE |
7 5/8 | 26.4 | 193.67 | 8.33 | PSLBE | PLBE | PLBE | PLBE | - | - |
29.7 | 9.52 | - | PLBE | PLBE | PLBE | PLBE | - |
33.7 | 10.92 | - | PLBE | PLBE | PLBE | PLBE | - |
39 | 12.7 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
42.8 | 14.27 | - | PLB | PLB | PLB | PLB | PLB |
45.3 | 15.11 | - | PLB | PLB | PLB | PLB | PLB |
47.1 | 15.88 | - | PLB | PLB | PLB | PLB | PLB |
8 5/8 | 24 | 219.08 | 6.71 | PS | - | - | - | - | - |
28 | 7.72 | - | - | - | - | - | - |
32 | 8.94 | PSLBE | - | - | - | - | - |
36 | 10.16 | PSLBE | PLBE | PLBE | PLBE | - | - |
40 | 11.43 | - | PLBE | PLBE | PLBE | PLBE | - |
44 | 12.70 | - | PLBE | PLBE | PLBE | PLBE | - |
49 | 14.15 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
9 5/8 | 36 | 244.48 | 8.94 | PSLB | - | - | - | - | - |
40 | 10.03 | PSLBE | PLBE | PLBE | PLBE | - | - |
43.5 | 11.05 | - | PLBE | PLBE | PLBE | PLBE |
|
47 | 11.99 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
53.5 | 13.84 | - | PLBE | PLBE | PLBE | PLBE | PLBE |
58.4 | 15.11 | - | PLB | PLB | PLB | PLB | PLB |
10 3/4 | 40.5 | 273.05 | 8.89 | PSB | - | - | - | - | - |
45.5 | 10.16 | PSBE | - | - | - | - | - |
51 | 11.43 | PSBE | PSBE | PSBE | PSBE | PSBE | - |
55 | 12.57 | - | PSBE | PSBE | PSBE | PSBE | - |
60.7 | 13.84 | - | - | - | PSBE | PSBE | PSBE |
65.7 | 15.11 | - | - | - | PSB | PSB | PSB |
113/4 | 47 | 298.45 | 9.53 | PSB | - | - | - | - | - |
54 | 11.05 | PSB | - | - | - | - | - |
60 | 12.42 | PSB | PSB | PSB | PSB | PSB | PSB |
13 3/8 | 48 | 339.72 | 8.38 | - | - | - | - | - | - |
54.5 | 9.65 | PSB | - | - | - | - | - |
61 | 10.92 | PSB | - | - | - | - |
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68 | 12.19 | PSB | PSB | PSB | PSB | PSB | - |
72 | 13.06 | - | PSB | PSB | PSB | PSB | PSB |
16 | 75 | 406 | 11.13 | PSB | - | - | - | - | - |
84 | 12.57 | PSB | - | - | - | - | - |
109 | 16.66 | P | P | P | - | P | P |
20 | 94 | 508 | 11.13 | PSLB | - | - | - | - | - |
30 | 96 | 762 | 16.13 | PSLB | - | - | - | - | - |
P-Plain end; S-Short round thread; L-Long round thread; B-Buttress thread; E-Extreme line; |
Standard
API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells
Mechanical Properties
Grade | Type | Total elongation under load % | Yield Strength M pa | Tensile strength min Mpa | Hardness | Specified wall thickness mm | Allowable hardness variation |
HRC |
min | max | HRC | HBW |
J55 | - | 0.5 | 379 | 552 | 517 | - | - | - | - |
K55 | - | 0.5 | 379 | 552 | 655 | - | - | - | - |
N80
| 1 | 0.5 | 552 | 758 | 689 | - | - | - | - |
Q | 0.5 | 552 | 758 | 689 | - | - | - | - |
M65 | - | 0.5 | 448 | 586 | 586 | 22 | 235 | - | - |
L80
| 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | - | - |
9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | - | - |
13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | - | - |
C90 | 1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | ≤12.70 | 3.0 |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | 12.71-19.04 | 4.0 |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | 19.05-25.39 | 5.0 |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | ≥25.4 | 6.0 |
C95 | - | 0.5 | 655 | 724 | 724 | - | - | - | - |
T95 | 1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | ≤12.70 | 3.0 |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | 12.71-19.04 | 4.0 |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | 19.05-25.39 | 5.0 |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | ≥25.4 | 6.0 |
P110 | - | 0.6 | 758 | 965 | 862 | - | - | - | - |
Q125 | All | 0.65 | 862 | 1034 | 931 | b | - | ≤12.70 | 3.0 |
All | 0.65 | 862 | 1034 | 931 | b | - | 12.71-19.04 | 4.0 |
All | 0.65 | 862 | 1034 | 931 | b | - | ≥19.05 | 5.0 |
Chemical Composition
Standard | Grade | Composition（%） |
C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | AIs |
API SPEC 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 |
K55· |
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 |
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 |
P110 | 0.26～0.35 | 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 |
Product Picture
Product Application
