What is P110 casing
Apr 13, 2026
API 5CT P110 is a high-strength petroleum casing steel grade that complies with the American Petroleum Institute (API) 5CT standard, specifically designed to support wellbore walls, ensure drilling safety, and ensure long-term operation of oil and gas wells during drilling.
The "P" in P110 represents the steel grade, and "110" represents its minimum yield strength of 110000 psi (approximately 758 MPa). It has excellent tensile, compressive, and crush resistance, and is suitable for deep wells, ultra deep wells, and high-pressure and high stress environments with complex geological conditions.
Insufficient pressure in deep well mining? P110 high-strength casing, with compression resistance far exceeding industry standards, builds a strong safety defense line for oil and gas extraction! Inquire now for exclusive solutions.
API 5CT Grade P110 Casing Tubing Color Code Table
| Grade | Color Marking (Top of Coupling) |
|---|---|
| J55 | One green band |
| K55 | One purple band |
| N80 | One red band |
| L80 | One silver band (13Cr: white) |
| P110 | White + one purple band (dual-color marking) |
API 5CT P110 Oil Casing Pipe Chemical Composition Table
| Element | Content Range (%) | Function |
|---|---|---|
| C (Carbon) | 0.26–0.35 | Increases strength |
| Si (Silicon) | 0.17–0.37 | Deoxidizer, matrix strengthener |
| Mn (Manganese) | 0.40–0.70 | Improves hardenability and strength |
| P (Phosphorus) | ≤0.020 | Harmful element, strictly controlled |
| S (Sulfur) | ≤0.010 | Causes hot shortness, kept extremely low |
| Cr (Chromium) | 0.80–1.10 | Enhances corrosion resistance |
| Mo (Molybdenum) | 0.15–0.25 | Improves high-temperature strength and temper embrittlement resistance |
| V (Vanadium) | ≤0.08 | Refines grain structure, improves toughness |
API 5CT P110 Oil Special Pipe Mechanical Property Table
| Mechanical Property | Requirement | Test Standard |
|---|---|---|
| Yield Strength (YS) | 758–965 MPa | API 5CT |
| Tensile Strength (TS) | ≥862 MPa | API 5CT |
| Elongation (El%) | ≥18% | API 5CT |
| Impact Energy (0°C) | Transverse ≥60J, Longitudinal ≥100J (Q125 reference) | ISO 11960 |
| Brinell Hardness (HB) | Typically ≤300, controlled based on service conditions | ASTM E10 |
Dimensions and Weight Table
| Outside Diameter (mm) | Wall Thickness (mm) | Weight per Meter (kg/m) | Length Range (m) | Connection Type |
|---|---|---|---|---|
| 114.3 | 6.88 | 15.2 | 8–13 | Plain Thread / Buttress |
| 139.7 | 7.72 | 23.09 | 8–12 | Premium Thread |
| 177.8 | 8.05 | 34.26 | 8–13 | Plain Thread |
| 219.1 | 6.71 | 35.75 | 7.62–10.36 | Buttress Thread |
| 244.48 | 11.05 | ~47.66^ | 6–13 | Welded / Threaded |
Features of P110 Casing
- High Strength: Suitable for deep and high-pressure wells with superior collapse resistance
- High Toughness: Excellent low-temperature impact performance after quenching and tempering
- Corrosion Resistant: Contains Cr and Mo alloys, suitable for mildly corrosive environments
- Good Weldability: Facilitates on-site connection and maintenance
- High Standardization: Complies with API, GB9948, and other international standards
Inspection for P110 Casing and Tubing
- Tensile Test: Verify yield and tensile strength
- Flattening Test: Assess plastic deformation capability to prevent downhole fracture
- Hydrostatic Test: Validate sealing integrity; pressure not less than specified value
- Non-Destructive Testing (NDT): Includes ultrasonic and magnetic particle inspection to ensure internal defect-free
- Sulfide Stress Corrosion Cracking (SSC) Test: Required for sour service applications
- Dimensional and Visual Inspection: Confirm OD, wall thickness, and thread accuracy within tolerances
- Chemical Composition Analysis: Use spectrometers to verify elemental content
- Metallographic Examination: Ensure uniform microstructure post-heat treatment, free from overheating or Widmanstätten structures
API 5CT P110 Casing test and inspection
API 5CT P110 Casing pipe factory
FAQ
What is the difference between P110 and C110
The core difference between API 5CT P110 and C110 is that P110 focuses on high strength and is suitable for high-pressure environments in deep wells; C110 is specifically designed for sulfur resistance and is used in corrosive oil and gas wells containing H ₂ S.
P110: The minimum yield strength is 758-965 MPa, emphasizing mechanical strength and crush resistance, suitable for non corrosive deep wells, but not recommended for use in sulfur-containing environments.
C110: Yield strength 758-828 MPa, slightly lower but more focused on toughness, hardness strictly controlled within ≤ 30 HRC, must pass NACE TM 0177 sulfur resistance test, suitable for high sulfur gas fields (such as the Middle East and Sichuan).
What is API 5CT P110 casing and tubing used for
API 5CT P110 casing and tubing are mainly used in the drilling and production stages of oil and gas wells, including:
P110 casing: As a wellbore support structure, it is used to fix the wellbore, prevent formation collapse, isolate different pressure layers, especially suitable for deep wells, ultra deep wells, and high-pressure complex geological environments, ensuring drilling safety and long-term stable operation of oil wells.
P110 tubing: used to transport oil and gas from the production layer to the surface at the bottom of the well. Due to its high strength and good sealing, it is suitable for long-term oil and gas production operations in high-yield and high-pressure wells.
