OCTG (Oil Country Tubular Goods)

Oil Country Tubular Goods (OCTG) are a specialized group of seamless and welded steel tubular products used in the exploration, drilling, completion, and production of oil and natural gas wells. Manufactured in accordance with API 5CT and other international standards, OCTG products are designed to withstand high pressure, corrosive environments, extreme temperatures, and complex downhole conditions.

Changhao supplies a comprehensive range of OCTG products for onshore and offshore oil & gas projects, including casing pipes, tubing pipes, drill pipes, couplings, and related accessories. Our products are available in multiple steel grades, thread connections, sizes, and specifications to meet the requirements of global EPC contractors, drilling companies, oilfield service providers, and pipeline distributors.

Our OCTG Product Range

• API 5CT Casing Pipe

• API 5CT Tubing Pipe

• Drill Pipe

• Casing Couplings

• Pup Joints

• Casing Accessories

Available Steel Grades

• J55

• K55

• N80

• L80

• C90

• T95

• P110

• Q125

Thread Connection Types

• STC – Short Thread Coupling

• LTC – Long Thread Coupling

• BTC – Buttress Thread Coupling

• Premium Connections (Available Upon Request)

Products are available in both Seamless and Electric Resistance Welded (ERW) configurations to meet different project requirements.

Key Features

Manufactured to International Standards

All OCTG products are manufactured in accordance with API 5CT, API 5B, and other relevant international standards, ensuring excellent dimensional accuracy, mechanical performance, and full interchangeability.

High-Strength Steel Grades

From standard J55 and K55 to high-performance P110 and Q125, Changhao offers OCTG products suitable for conventional, deep, ultra-deep, and HPHT (High Pressure / High Temperature) wells.

Excellent Corrosion Resistance

Optional corrosion-resistant materials and treatments are available for applications involving CO₂, H₂S, chlorides, and other aggressive media, helping to extend service life in demanding oilfield environments.

Reliable Thread Connections

Precision-machined API thread connections provide excellent sealing performance, high torque capacity, and reliable mechanical strength throughout drilling, completion, and production operations.

Strict Quality Control

Every OCTG product undergoes comprehensive inspection and testing before shipment, including:

• Chemical Composition Analysis

• Mechanical Property Testing

• Hydrostatic Pressure Testing

• Ultrasonic Testing (UT)

• Electromagnetic Inspection (EMI)

• Magnetic Particle Inspection (MPI)

• Thread Gauge Inspection

• Drift Testing

• Dimensional Inspection

• Mill Test Certificate (MTC)

Applications

Changhao OCTG products are widely used throughout the entire oil and gas production process, including:

• Onshore Oil & Gas Wells

• Offshore Drilling Platforms

• Shale Gas Development

• Natural Gas Production

• Deep & Ultra-Deep Wells

• Geothermal Wells

• Water Injection Wells

• Coal Bed Methane (CBM) Projects

• Enhanced Oil Recovery (EOR) Systems

Why Choose Changhao OCTG Products?

• API-compliant manufacturing

• Complete range of casing and tubing products

• Multiple steel grades and thread connection options

• Large diameter and heavy wall solutions available

• OEM & customized manufacturing services

• Comprehensive inspection and NDT testing

• Fast delivery with global export experience

• Professional engineering and technical support

Our experienced engineering and quality teams ensure that every OCTG product delivers outstanding mechanical performance, dimensional accuracy, and long-term reliability under the most demanding oilfield operating conditions.

Whether your project requires API 5CT K55 Surface Casing, P110 LTC Casing, Premium Connection Tubing, or customized OCTG solutions, Changhao is committed to providing dependable products and professional technical support for oil and gas projects worldwide.