API Casing
Isolating formation fluids: preventing groundwater, oil, and gas from flowing between different formations, protecting the underground water resources.
Establishing a pressure barrier: controlling the high pressure within the well to prevent blowouts.
Providing a passage: offering a passage for subsequent drilling operations, completion operations, and oil and gas extraction.
Classification :
PRODUCT DETAILS
Deacription
API casing refers to steel pipes manufactured to API 5CT standards, used to line oil/gas wellbores, provide structural support, prevent collapse, isolate formations, and control downhole pressure during drilling and production. It is a core component of OCTG (Oil Country Tubular Goods).
1. Core Functions
Wellbore Stability: Resist formation collapse and maintain borehole integrity.
Zonal Isolation: Separate oil/gas zones from water-bearing formations to avoid contamination.
Pressure Containment: Control internal/external pressure to prevent blowouts.
Structural Base: Support wellhead equipment, BOPs, and production tubing.
2. Key Standards (API 5CT)
Dimensions: 14 standard OD sizes: 4.5" (114.3 mm) to 20" (508 mm).
Grades: Yield strength-rated steel grades (e.g., J55, N80, P110, Q125) for varying depth/corrosion needs.
Length Ranges:
R1: 4.88–7.62 m
R2: 7.62–10.36 m (common)
R3: 10.36+ m
Threads: STC, LTC, BTC, XL (tapered for sealing/strength).
3. Casing String Types (From Surface Down)
Conductor Pipe: Large-diameter, shallow setting; stabilizes surface formations.
Surface Casing: Protects freshwater aquifers; supports wellhead/BOPs.
Intermediate Casing: Isolates unstable zones/high-pressure formations.
Production Casing: Seals pay zones; remains for long-term production.
4. Critical Specifications
Material: Carbon/alloy steel; corrosion-resistant grades for harsh environments.
Wall Thickness: 5.21–16.13 mm (size/grade-dependent).
Performance Requirements: Burst pressure, collapse resistance, joint strength, and corrosion control.
5. Applications
Onshore/offshore oil/gas wells, geothermal wells, and injection wells.
Used in conventional, unconventional (shale), and deepwater projects.
Specification&Standard
Chemical Analysis
|
Standard |
Type of pipe |
Class |
Grade |
C |
Si |
Mn |
P |
S |
V |
Nb |
Ti |
|
max |
max |
max |
max |
max |
max |
max |
max |
||||
|
API SPEC 5L |
SMLS |
PLS1 |
L245 B L290 X42 L320 X46 L360 X52 L390 X56 L415 X60 L450 X65 L485 X70 L245N BN |
0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.24 |
0.4 |
1.20 1.30 1.40 1.40 1.40 1.40 1.40 1.40 1.20 |
0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.025 |
0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.015 |
--------- |
--------- |
0.04 |
|
PLS2 |
L290N X42N |
0.24 |
0.4 |
1.2 |
0.025 |
0.015 |
0.06 |
0.05 |
0.04 |
||
|
L320N X46N |
0.24 |
0.4 |
1.4 |
0.025 |
0.015 |
0.07 |
0.05 |
0.04 |
|||
|
L360N X52N |
0.24 |
0.45 |
1.4 |
0.025 |
0.015 |
0.1 |
0.05 |
0.04 |
|||
|
L390N X56N |
0.24 |
0.45 |
1.4 |
0.025 |
0.015 |
0.1 |
0.05 |
0.04 |
|||
|
L415N X60N |
0.24 |
0.45 |
1.4 |
0.025 |
0.015 |
0.1 |
0.05 |
0.04 |
|||
|
WELD |
PLS1 |
L245 B |
0.26 |
- |
1.2 |
- |
0.03 |
0.03 |
- |
- |
|
|
L290 X42 |
0.26 |
- |
1.3 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L320 X46 |
0.26 |
- |
1.4 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L360 X52 |
0.26 |
- |
1.4 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L390 X56 |
0.26 |
- |
1.4 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L415 X60 |
0.26 |
- |
1.4 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L450 X65 |
0.26 |
- |
1.45 |
- |
0.03 |
0.03 |
- |
- |
|||
|
L485 X70 |
0.26 |
- |
1.65 |
- |
0.03 |
0.03 |
- |
- |
|||
|
PLS2 |
L245M BM |
0.22 |
0.45 |
1.2 |
0.025 |
0.015 |
0.05 |
0.05 |
0.04 |
||
|
L290M X42M |
0.22 |
0.45 |
1.3 |
0.025 |
0.015 |
0.05 |
0.05 |
0.04 |
|||
|
L320M X46M |
0.22 |
0.45 |
1.3 |
0.025 |
0.015 |
0.05 |
0.05 |
0.04 |
|||
|
L360M X52M |
0.22 |
0.45 |
1.4 |
0.025 |
0.015 |
- |
- |
- |
|||
|
L390M X56M |
0.22 |
0.45 |
1.4 |
0.025 |
0.015 |
- |
- |
- |
|||
|
L415M X60M |
0.12 |
0.45 |
1.6 |
0.025 |
0.015 |
- |
- |
- |
|||
|
L450M X65M |
0.12 |
0.45 |
1.6 |
0.025 |
0.015 |
- |
- |
- |
|||
|
L485M X70M |
0.12 |
0.45 |
1.7 |
0.025 |
0.015 |
- |
- |
- |
|||
|
L555M X80M |
0.12 |
0.45 |
1.85 |
0.025 |
0.015 |
- |
- |
- |
Mechanical Properities
|
Standard |
Class |
Grade |
|
Yield strength not less than (MPa) |
Tensile strength (MPa) |
Elongation(%) |
Y.S/T.S |
|
API SPEC 5L ISO 3183 |
PLS1 |
L245B |
min |
245 |
415 |
b |
- |
|
L290X42 |
min |
290 |
415 |
b |
- |
||
|
L320X46 |
min |
320 |
435 |
b |
- |
||
|
L360X52 |
min |
360 |
460 |
b |
- |
||
|
L390X56 |
min |
390 |
490 |
b |
- |
||
|
L415X60 |
min |
415 |
520 |
b |
- |
||
|
L450X60 |
min |
450 |
535 |
b |
- |
||
|
L485X70 |
min |
485 |
570 |
b |
- |
||
|
PLS2 |
L245N BN |
min |
245 |
415 |
b |
- |
|
|
L245M BM |
max |
450 |
760 |
b |
0.93 |
||
|
L290NX42N |
min |
290 |
415 |
b |
- |
||
|
L290MX42M |
max |
495 |
760 |
b |
0.93 |
||
|
L320NX46N |
min |
320 |
435 |
b |
- |
||
|
L320MX46M |
max |
525 |
760 |
b |
0.93 |
||
|
L360NX52N |
min |
360 |
460 |
b |
- |
||
|
L360MX52M |
max |
530 |
760 |
b |
0.93 |
||
|
L390NX56N |
min |
390 |
490 |
b |
- |
||
|
L390MX56M |
max |
545 |
760 |
b |
0.93 |
||
|
L415NX60N |
min |
415 |
520 |
b |
- |
||
|
L415MX60M |
max |
565 |
760 |
b |
0.93 |
||
|
L450MX65M |
min |
450 |
535 |
b |
- |
||
|
max |
600 |
760 |
b |
0.93 |
|||
|
L485MX70M |
min |
485 |
570 |
b |
- |
||
|
max |
635 |
760 |
b |
0.93 |
|||
|
L555MX80M |
min |
555 |
625 |
b |
- |
||
|
max |
705 |
825 |
b |
0.93 |
Toughness
|
Standard |
Grade |
Transverse minimum impact of Pipe body |
Transverse minimum impact of weld (J) |
|||||
|
(J) |
||||||||
|
D=508 |
508mm |
762mm |
914mm |
1219mm |
D<1422mm |
D=1422mm |
||
|
API SPEC 5L |
=L415X60 |
27(20) |
27(20) |
40(30) |
40(30) |
40(30) |
27(20) |
40(30) |
|
>L415X60 |
27(20) |
27(20) |
40(30) |
40(30) |
54(40) |
27(20) |
40(30) |
|
|
=L415X65 |
||||||||
|
>L450X65 |
27(20) |
27(20) |
40(30) |
40(30) |
54(40) |
27(20) |
40(30) |
|
|
=L485X70 |
||||||||
|
>L485X70 =L485X80 |
40(30) |
40(30) |
40(30) |
40(30) |
54(40) |
27(20) |
40(30) |
|
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