Welding process for transporting alpha type aluminum oxide ceramic lining by oil and gas pipeline

Abstract

The invention discloses a welding process for transporting an alpha type aluminum oxide ceramic lining by an oil and gas pipeline. The welding process specifically includes conducting processing of grooves for welding on the end portions of oil transportation pipelines, filling ceramic powder slurry at the welding gap positions of the abutting connection ends of the two oil transporting pipelines, solidifying the ceramic powder slurry in low power laser scanning mode to weld the welding gap filler in sealing mode, utilizing large power laser to conduct further welding, melting and covering a ceramic layer on the welded surface in the step 4) and welding a metal layer on the ceramic layer in melting mode. The welding process utilizes the laser welding technology to achieve connection problem between the alpha aluminum oxide ceramic lining, obtains a process mechanism for conducing the material welding by applying the laser technology, achieves consistent connection performance of the alpha aluminum oxide ceramic lining in the oil and gas pipeline, and enables the oil and gas pipeline to obtain good protection effect.

Description

technical field [0001] The invention relates to the field of petroleum transportation, in particular to a welding process for the inner lining of alpha-type alumina ceramics used for transportation of oil and gas pipelines. Background technique [0002] Petroleum pipeline corrosion is a key factor affecting the reliability and service life of petroleum pipeline systems. Vicious accidents caused by corrosion damage often cause huge economic losses and serious social consequences. For example, in 1977, a crude oil transportation pipeline in Alaska, USA, was about 1287KM long and cost 8 billion U.S. dollars. Due to uneven corrosion research and improper anticorrosion measures during construction, as many as 826 corrosion perforations occurred 12 years later, and the repair cost was only one The project cost $1.5 billion. With the progress of exploration and development of oil and natural gas in my country, the corrosion of crude oil containing hydrogen sulfide, carbon dioxide,...

AI Technical Summary

Problems solved by technology

This new technology of anti-corrosion lining has not been widely used in oil and gas pipelines. The length of the usual oil and gas pipelines is limited, generally about 12 meters, so the pipeline needs to be doubled. The two ends are welded together (containing alumina ceramics) to form a long-distance oil and gas pipeline. This project is dedicated to the research on the welding of alumina ceramics lining the pipeline, but because the physical and chemical properties of alumina ceramics are different from those of The connection and welding of metal and alumina ceramic lining in oil pipelines cannot adopt ordinary metal welding methods, so the connection and welding of alumina ceramic lining in oil pipelines have become an insurmountable obstacle for the application of ceramic-lined oil pipelines in the petroleum industry

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