What is OCTG? It includes Drill Pipe, Casing Pipe, Tubing and Couplings.

What is OCTG? It includes Drill Pipe, Casing Pipe, Tubing and Couplings.

OCTG, an acronym for Oil Country Tubular Goods, encompasses a range of piping products crucial in oil and gas production, particularly in drilling operations. These products adhere to API or similar industry standards and collectively include Drill Pipe, Steel Casing Pipe, Tubing Pipe, Couplings, Connections, and Accessories, utilized in both onshore and offshore petroleum industries.

OCTG Drill Pipe – Essential for Drilling Operations

Drill Pipe, a robust, seamless tube, rotates the drill bit and circulates drilling fluid. It withstands axial tension, high torque, and internal pressure, playing a vital role in the drilling process. Manufactured per API 5DP and API SPEC 7-1 standards, Drill Pipe facilitates fluid circulation through the annulus, the space between casing and piping.

Casing Pipe – Ensuring Wellbore Stability

Casing Pipes line the drilled borehole, providing stability during oil extraction. Resistant to axial tension, these large-diameter pipes are cemented in place to prevent cave-ins, contamination, and facilitate the installation of production equipment. Standardized under API 5CT, Steel Casing Pipes come in various grades like J55/K55, N80, L80, C90, T95, P110, with different connection types such as BTC, LTC, STC.

OCTG Tubing Pipe – Facilitating Oil and Gas Transport

OCTG Tubing Pipe is inserted inside the casing to transport oil or gas from the producing formation to processing facilities. This simpler component, normally in 30 ft (9 m) segments with threaded connections, must withstand pressure during extraction and resist loads and deformations related to production and workovers. Tubing, manufactured similarly to casing, undergoes an additional upsetting process to increase thickness.

OCTG Tubing Pipe standard

Similar to casing pipe standards, OCTG tubing under API 5CT comes in material grades (J55/K55, N80, L80, P110, etc.), with diameters up to 4 1/2”, and various end types such as BTC, EUE, NUE, and premium connections, most commonly EUE with thickened connections.

Features for OCTG pipe

All OCTG pipes require dependable hardness, achieved through the use of manganese and chromium as primary alloys to ensure cohesion and durability. Recent developments include blending Alloy and Molybdenum to overcome limitations associated with chromium and manganese, resulting in OCTG pipes that are harder than ever, eliminating concerns about sulfide stress cracking.

Looking to purchase OCTG couplings with assured quality at a competitive price?

Unlike in the past when sulfide stress cracking was a major concern, current OCTG pipes are more resilient and well-protected. As a responsible OCTG coupling supplier, we ensure our couplings, using guaranteed raw steel materials with competitive prices throughout China. Our Oil Country Tubular Goods comply with API standards and undergo third-party witness inspections, ensuring longevity and cost savings in the long run. As a comprehensive service provider for OCTG Couplings, we offer a comprehensive coupling solution for oil and gas companies. Contact us for top-quality OCTG couplings today.