High-Strength OCTG Casing for Stable Wellbores under Extreme Conditions
Casing pipe is the structural backbone of a wellbore — stabilizing the hole, isolating formations, and containing downhole pressures. Our API 5CT OCTG casing is manufactured from seamless steel with tight dimensional tolerances and precise thread connections, ensuring reliable performance in demanding oil & gas wells. Available in grades J55 to P110 with STC, LTC, BTC, and Premium connections, it delivers high collapse, burst, and tensile strength for safe, long-term well integrity.
Manufactured to API 5CT & ISO 11960 standards for global oil and gas well applications.
High collapse, burst, and tensile strength ensure long-term well integrity under extreme downhole conditions.
Available with STC, LTC, BTC, and Premium gas-tight thread connections.
Fully inspected by hydrostatic, UT, MT, EMI, and thread gauge testing for quality assurance.
API 5CT OCTG CASING — Stable Wellbores & Zonal Isolation
- High collapse, burst, and tensile performance for demanding downhole loads.
- Tight dimensional tolerances and precision-machined threads; gas-tight premium options for critical wells.
- Comprehensive inspection program — hydrostatic, UT/MT/EMI, dimensional and thread gauging.
- Field-ready delivery with couplings installed, thread protectors, and export-grade bundling.
Description
API 5CT OCTG casing pipe serves as the primary structural barrier in an oil and gas well. Installed as successive strings — conductor, surface, intermediate, and production — it stabilizes the borehole, protects freshwater aquifers, provides zonal isolation, and contains well pressures throughout drilling and production. Manufactured from seamless steel and heat-treated by grade, our casing delivers dependable collapse, burst, and tensile performance across a wide range of depths and formations.
Each joint is precision-threaded and coupled with controlled make-up torque and thread compound. Gas-tight premium connections are available for critical wells requiring enhanced sealability, bending tolerance, and fatigue resistance. Every pipe is hydrostatically tested and examined by UT/MT/EMI with dimensional and thread gauging, backed by full heat and lot traceability. R1, R2, and R3 lengths are supplied field-ready with fitted couplings and thread protectors.
- Stable wellbore support and reliable zonal isolation from spud to production.
- High collapse / burst / tensile capacities — drifted per API 5CT requirements.
- Tight dimensional tolerances; STC / LTC / BTC and Premium gas-tight options.
- Comprehensive inspection program: hydrostatic, UT, MT, EMI, dimensional & thread.
- Field-ready delivery with couplings installed and export bundling protection.
| Product Name | API 5CT OCTG Casing Pipe |
|---|---|
| Outside Diameter | 4 1/2" – 20" (114.3 – 508 mm) |
| Length | R1 (4.88–7.62 m) · R2 (7.62–10.36 m) · R3 (10.36–14.63 m) |
| Steel Grades | J55 · K55 · N80Q · L80-1 · L80-9Cr · L80-13Cr · C90 · T95 · P110 |
| Connections | STC · LTC · BTC · Premium (VAM, TenarisHydril or specified) |
| Ends & Protection | Threaded & Coupled (T&C); thread compound and protectors; couplings installed |
| Standard | Steel Grade |
|---|---|
| API SPEC 5CT / ISO 11960 | J55 / K55 |
| API SPEC 5CT / ISO 11960 | N80Q |
| API SPEC 5CT / ISO 11960 | L80-1 / L80-9Cr / L80-13Cr |
| API SPEC 5CT / ISO 11960 | C90 / T95 / P110 |
Specifications Sheet
Main Applications
API 5CT OCTG casing pipes act as the structural backbone of oil & gas wells. Installed as successive strings — conductor, surface, intermediate, and production — they stabilize the borehole, provide reliable zonal isolation, and maintain well integrity under high collapse, burst, and tensile loads in both onshore and offshore fields.
Oil & Gas Wells
Primary casing strings throughout drilling, completion, and workover to ensure structural support and zonal isolation.
High-Pressure / High-Temperature (HPHT)
Deep or deviated wells requiring enhanced strength with gas-tight premium connections for sealability and fatigue tolerance.
Shale & Directional Drilling
Horizontal or extended-reach wells that demand robust threads, torque capacity, and consistent make-up performance.
Offshore & Subsea Operations
Reliable zonal isolation and mechanical integrity under high external pressures and corrosive marine environments.
Geothermal & Injection Wells
Suitable for temperature cycling and corrosive media where long-term integrity is critical.
Advantages
- Strength Window: High collapse, burst, and tensile capacities compliant with API 5CT / ISO 11960.
- Sealability: STC/LTC/BTC and premium gas-tight options for critical wells, stable make-up and bending tolerance.
- Materials: Grades from J55 to P110, with 13Cr options for CO₂/H₂S service as specified.
- Quality & Traceability: Hydrostatic, UT/MT/EMI, dimensional and thread gauging with full heat/lot records.
- Ready-to-Run Supply: Couplings installed, threads doped and protected for efficient rig-site handling.
Packing & Transportation
OCTG casing pipes are packed to preserve thread and surface integrity from mill to well site, with protectors and secure bundling for export.
- Bundled / Frame Packing: Steel straps or wooden frames with protective pads; plastic thread protectors fitted.
- Container Shipping: Suitable for R1 and selected cut lengths (e.g., ≤≈6 m for 20′; ≤≈12 m for 40′ HC), depending on project logistics.
- Breakbulk / Bulk Vessel: Recommended for R2/R3 long joints or large volumes; wooden saddles with layered wrapping.