The API standard casing and tubing manufactured by Beyond adheres strictly to the API 5CT standard across all quality control aspects, including chemical composition, mechanical properties, and dimensional precision. Within the framework of this standard, all control indicators have been tightened—this refinement ensures more consistent performance and enhanced quality reliability of the products.
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Casing is a critical tubular product used to line the walls of drilled wells, providing structural support and protecting the wellbore from collapse, formation fluid intrusion, and contamination. Installed in sections (surface casing, intermediate casing, production casing), Casing isolates different geological formations, prevents fluid migration between zones, and creates a secure pathway for drilling fluids and production fluids. Manufactured to strict API Spec 5CT standards, our Casing products are engineered for durability, corrosion resistance, and dimensional precision, ensuring long-term well integrity in oil, gas, water, and geothermal wells.
Our Casing stands out for its exceptional quality and performance-driven design. We adhere to rigorous Chemical Composition control, with stricter limits on phosphorus (P) and sulfur (S) than required by API Spec 5CT, reducing brittleness and improving corrosion resistance. The Steel Grade options—J55, K55, N80, L80(13Cr), P110, etc.—are selected for their tailored Mechanical Properties, including optimized Tensile Strength, Yield Strength, and elongation, ensuring compatibility with diverse well conditions. For corrosion-prone environments, our L80(13Cr) grade offers enhanced resistance to sour fluids. The Dimensional Precision of our Casing is unmatched, with tight control over outer diameter, wall thickness, and End Processing Form (plain end, non-upset, external upset, thread and coupling, integral joint) to ensure secure connections and leak-proof performance. Additionally, our Casing exceeds API toughness requirements, minimizing the risk of failure under downhole pressure and temperature fluctuations.
| Mechanical Properties: | |||||||||
| Standard | Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness | ||||
| API SPEC 5CT | J55 | ≥517 | 379~552 | Refer to sheet | |||||
| K55 | ≥517 | ≥655 | |||||||
| N80 | ≥689 | 552~758 | |||||||
| L80(13Cr) | ≥655 | 552~655 | ≤241HB | ||||||
| P110 | ≥862 | 758~965 | |||||||
| Chemical Composition | |||||||||
| Standard | Grade | Chemical Composition (%) | |||||||
| C | Si | Mn | P | Cu | Mo | V | Als | ||
| API SPEC 5CT | J55K55 (37Mn5) | 0.34~0.39 | 0.20~0.35 | 1.25~1.50 | ≤0.020 | ≤0.20 | / | / | ≤0.020 |
| N80 (36Mn2V) | 0.34~0.38 | 0.20~0.35 | 1.45~1.70 | ≤0.020 | / | / | 0.11~0.16 | ≤0.020 | |
| L80 (13Cr) | 0.15~0.22 | ≤1.00 | 0.25~1.00 | ≤0.020 | ≤0.20 | / | / | ≤0.020 | |
| P110 (30CrMo) | 0.26~0.35 | 0.17~0.37 | 0.40~0.70 | ≤0.020 | ≤0.20 | 0.15~0.25 | ≤0.08 | ≤0.020 | |
| Casing Specification | |||||||||
| Dimension Code | Weight Code | Outer Diameter | Thickness | End Processing Form | |||||
| Steel Grade | |||||||||
| in | mm | in | N80 | C90 | T95 | P110 | |||
| 1.900" | 2.4 | - | 1.9 | 48.26 | 0.125 | - | - | - | - |
| 2.75 | 2.90 | 1.90 | 48.26 | 0.15 | PNUI | PNUI | PNUI | - | |
| 3.65 | - | 1.9 | 48.26 | 0.2 | PU | PU | PU | PU | |
| 2 3/8" | 4.00 | - | 2.38 | 60.32 | 0.17 | PN | PN | PN | - |
| 4.00 | 4.70 | 2.38 | 60.32 | 0.19 | PNU | PNU | PNU | - | |
| 5.80 | 5.95 | 2.38 | 60.32 | 0.25 | PNU | PNU | PNU | PNU | |
| 6.60 | - | 2.38 | 60.32 | 0.26 | - | P | P | PNU | |
| 7.35 | 7.45 | 2.38 | 60.32 | 0.34 | - | PU | PU | - | |
| 2 7/8 " | 6.40 | 6.50 | 2.88 | 73.02 | 0.22 | PNU | PNU | PNU | - |
| 7.80 | 7.90 | 2.88 | 73.02 | 0.28 | PNU | PNU | PNU | PNU | |
| 8.60 | 8.70 | 2.88 | 73.02 | 0.31 | PNU | PNU | PNU | PNU | |
| 9.35 | 9.45 | 2.88 | 73.02 | 0.34 | - | PU | PU | PNU | |
| 10.50 | - | 2.88 | 73.02 | 0.39 | - | P | P | - | |
| 11.50 | - | 2.88 | 73.02 | 0.44 | - | P | P | - | |
| 3 1/2" | 7.70 | - | 3.50 | 88.90 | 0.22 | PN | PN | PN | - |
| 9.20 | 9.30 | 3.50 | 88.90 | 0.25 | PNU | PNU | PNU | - | |
| 10.20 | - | 3.50 | 88.90 | 0.29 | PN | PN | PN | PNU | |
| 12.70 | 12.95 | 3.50 | 88.90 | 0.38 | PNU | PNU | PNU | - | |
| 14.30 | - | 3.50 | 88.90 | 0.43 | - | P | P | PNU | |
| 15.50 | - | 3.50 | 88.90 | 0.48 | - | P | P | - | |
| 17.00 | - | 3.50 | 88.90 | 0.53 | - | P | P | - | |
| 4" | 9.50 | - | 4.00 | 101.60 | 0.23 | PN | PN | PN | - |
| 10.70 | 11.00 | 4.00 | 101.60 | 0.26 | PU | PU | PU | - | |
| 4 1/2" | 12.60 | 12.75 | 4.50 | 114.30 | 0.27 | PNU | PNU | PNU | - |
| 15.20 | - | 4.50 | 114.30 | 0.34 | - | P | P | - | |
| 17.00 | - | 4.50 | 114.30 | 0.38 | - | P | P | - | |
| 18.90 | - | 4.50 | 114.30 | 0.43 | - | P | P | - | |
| 21.50 | - | 4.50 | 114.30 | 0.50 | - | P | P | - | |
| 23.70 | - | 4.50 | 114.30 | 0.56 | - | P | P | - | |
| 26.10 | - | 4.50 | 114.30 | 0.63 | - | P | P | - | |
| Note: P—Plain end; N—Non-upset; U—External upset; T&C—Thread and coupling; I—Integral joint. | |||||||||
Casing is essential for virtually all drilling projects. In oil and gas wells, it is used as surface casing to protect shallow aquifers, intermediate casing to isolate high-pressure zones, and production casing to support the wellbore during hydrocarbon extraction. Water wells rely on Casing to prevent contamination and maintain well stability, ensuring clean, reliable water supply. Geothermal wells use corrosion-resistant Casing to withstand high-temperature, mineral-rich fluids. Additionally, Casing is used in mining infrastructure, environmental monitoring wells, and civil engineering projects such as foundation piles, where it provides structural support and prevents soil or rock collapse. Its versatility makes it a cornerstone of safe, efficient drilling operations across industries.
Casing lines the wellbore to prevent collapse, isolate different geological formations (e.g., separating freshwater aquifers from hydrocarbon zones), and protect against formation fluid intrusion, ensuring safe, efficient drilling and production.
Consider well depth, formation pressure, temperature, and fluid composition. For standard conditions, J55/K55 or N80 are cost-effective; for high-pressure wells, P110 offers higher strength; for sour environments, L80(13Cr) provides corrosion resistance.
Yes, our Casing is manufactured to API Spec 5CT and API Spec 5B standards, with standard thread types and end processing, ensuring compatibility with most wellhead, coupling, and cementing equipment.
We implement strict quality control throughout production: pre-production sample testing, in-process monitoring of chemical composition and mechanical properties, and final inspection (including dimensional checks and NDT) before shipment, ensuring compliance with all standards.
