Casing and Tubing

Seamless oilfield casing and tubing produced to API 5CT requirements for well construction and production. These tubulars are manufactured from seamless steel, threaded and coupled at both ends (threaded-and-coupled, T&C) to allow secure make-up in well strings. Casing is used to line the wellbore and isolate formations; tubing runs inside the casing to convey produced fluids to surface.

Key features

• Manufactured to API 5CT standard for casing and tubing materials and mechanical properties.
• Seamless steel construction for high axial and radial strength in downhole conditions.
• Common API grades available for well applications (examples used in the industry include J55, K55, N80, L80, C90, T95, P110).
• End connections: threaded and coupled (API-style threads/couplings).
• Typical tubing sizes are under 4" OD; casing sizes are larger and selected per well design.
• Lengths supplied in standard ranges (industry length classes R1, R2, R3) — R2 and R3 are the most commonly used.
• Internal/external corrosion protection options, including corrosion-resistant alloy (CRA) linings or coatings for environments where corrosion or erosion is a concern.

Typical applications

• Production tubing conveying oil and gas from the reservoir to surface
• Various casing strings: conductor, surface, intermediate, and production casing to support the wellbore and isolate zones
• Workover and intervention operations where reliable make-up and tensile capacity are required

Quality and testing

• Supplied with material certificates and standard testing per API 5CT (chemical analysis, mechanical testing). Additional NDT, hardness, or special coatings can be supplied upon request.

Ordering options

• Specify API grade, outer diameter, weight/ft (or wall thickness), length class (R1/R2/R3), end finish (pin/box thread and coupling type), and any corrosion protection or special heat treatment required. Custom sourcing and inspection plans are available for large or project-based orders.

Contact your procurement representative with detailed well specifications (required OD, weight, grade, length class, and connection type) to receive a tailored quotation and lead time.