Products & Services - Line Pipe & OCTG -Casing, Tubing and Associated Products
Oil Country Tubular Goods (OCTG)
Oil-Tech can offer all kinds of oil country tubular goods (OCTG) and internal coating services.
Casing, Tubing and Associated Products
General Introduction
Product type:
- Seamless casing and coupling
- ERW casing
- Seamless tubing and coupling
- Anticorrosion casing and tubing
- High collapse and high temperature casing
- Premium thread connection casing and tubing
- Pup-joint and crossover of casing and tubing
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![]() Casing and tubing coupling |
Specifications:
API Spec 5CT, API Spec 5B, and other manufactures' specifications higher than API Spec.
Production capacity

(1)T=High-collapse casing, H=High quality tubing and casing for steam injection wells, SS3Cr=Economical CO2 / H2S resistant tubing and casing, S&SS=H2Scorrosion resistant tubing and casing, TS &TSS=High-collapse H2S corrosion resistant casing, 13Cr80 (95,110)=CO2 corrosion resistant tubing and casing, 145 (150)=Super high-strength tubing and casing;
(2)WSP=premium thread connection of WSP-series.
Process Flowchart of Casing and Tubing


API Products
Parameters of seamless casing

Parameters of ERW casing

Parameters of tubing

Non-API Products
WSP-series tubing and casing are used under extreme conditions in harsh environments (such as deep wells, steam injection wells, and environments containing H2S and CO2 and geological conditions with high corrosion and stratum pressure). They are high quality value-added non-API products with advanced technology.
Parameters of non-API Products

Part of production line of casing and tubing
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First fonverter smelting | Refining furnace & Vacuum degassing | ||
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Continuous casting | Billet rolling | ||
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Round billet cutting | Billet heating | ||
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Piercing heating | Retained mandrel mill | ||
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Reheating | Stretch reducing and Sizing | ||
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Cooling | Straightening | ||
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Cold drawn and Sizing | NDT& Hydrostatic test | ||
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Marking & Coating | Bounding & Acceptance storage |