Research status and prospects of bimetallic composite pipes for submarine oil and gas transmission

Considering oil and gas gathering and transportation needs during deepwater oil and gas field development process, the mainstream manufacturing processes of bimetallic composite pipes at home and abroad were reviewed in this paper. The performance requirements of bimetallic composite pipes for submarine oil and gas transmission were discussed from six aspects, including base pipe material, corrosion resistant alloy layer material, interfacial bonding strength, weldability, dimensional accuracy and bending performance. After compared with other protective measures (e.g. carbon steel pipe + corrosion inhibitor, internal coatings, and corrosion-resistance pure alloy), bimetallic composite pipe is superior economically and technically. Bimetallic composite pipe costs more than those with "carbon steel pipe + corrosion inhibitor" and internal coatings at the earlier stage, but its maintenance cost is much less and it is safer and more reliable. And the application status of the bimetallic composite pipes for submarine oil and gas transmission at home and abroad was reviewed, it was proposed to increase domestic technical level of bimetallic composite pipes for submarine oil and gas transmission from the aspects of product manufacturing processes, ancillary products, field welding technology and quality control.