OCTG tubing and casing pipes

OCTG Tubing and Casing (API 5CT)

OCTG (Oil Country Tubular Goods) is the backbone of every well — tubing carries the production, casing protects the wellbore. We supply seamless and ERW tubing and casing to API 5CT from licensed Chinese mills in grades J55, K55, N80, L80, P110 and Q125, with STC, LTC and BTC casing connections and EUE tubing threads. Every pipe ships with mill certificates, heat numbers, thread protectors and inspection records.

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Technical Specifications

ParameterSpecification
StandardAPI 5CT (product) / API 5B (thread gauging)
Product TypesTubing, casing, couplings, pup joints, crossover subs
GradesJ55, K55, N80, L80, P110, Q125
Sizes (OD)Tubing 1.050 in - 4.500 in; Casing 4.500 in - 20.000 in
ConnectionsSTC / LTC / BTC for casing; EUE for tubing; premium on request
Thread ProtectorsPlastic caps and thread compound applied at the mill

* Other sizes, wall thicknesses and premium connections (VAM, NEW VAM equivalents) available on request.

Inspection and Documentation

Drift, hydrostatic and visual inspection per API 5CT; EMI/UT for critical wells. Third-party inspection (SGS / BV / TUV) can be arranged on request.

Key Features

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Licensed Mill Sources

Supply from ISO 9001 / API 5CT-certified Chinese mills with consistent heat numbers and full traceability.

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Full Connection Range

STC, LTC, BTC for casing and EUE tubing threads; premium connections on request.

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Mill Test Certificates

Every shipment includes MTC EN 10204 3.1 with chemistry, mechanical properties and dimensional results.

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Consolidated Hardware

Couplings, pup joints and crossover subs ship together with the pipes in the same container.

Packaging and Shipping

PackagingHexagonal steel bundles, plastic thread protectors, sling markings per API requirements
MOQ20 tonnes (1x20 ft container) for standard sizes
Lead Time15-30 days after PO, depending on grade and size
IncotermsFOB Qingdao / CIF / CFR / DDP
PaymentT/T (30% deposit) / L/C at sight (negotiable)

Frequently Asked Questions

What is the difference between tubing and casing?

Tubing (typically 2-3/8 in to 4-1/2 in) runs inside the casing and carries the produced fluids to surface. Casing (4-1/2 in to 20 in) lines and protects the wellbore. Both are supplied to API 5CT with full mill certificates.

Which connection types do you supply?

STC, LTC and BTC threaded casing and EUE/NUE tubing as standard. Premium connections (VAM and NEW VAM equivalents) plus couplings, pup joints and crossovers available on request.

What is the MOQ and lead time?

MOQ is one 20 ft container (approx. 25-27 tonnes). Stock sizes ship in 15-25 days; new mill rolling takes 45-60 days. FOB Qingdao/Tianjin or CIF your port.

Can you arrange third-party inspection?

Yes. SGS/BV inspection, drift and hydrostatic testing per API 5CT, and EMI/UT for critical wells can all be arranged before shipment.