Abstract: With the increasing service life of oil and gas pipelines in China, a large number of maintenance and repair operations such as valve replacement, branch reconstruction, pipeline cutting and replacement are carried out every year. Taking into account the influence of many unfavorable factors such as landform and climate, the industry has put forward higher requirements for pipeline plugging operations. In view of the technical problems in pipeline plugging, the development status of plugging and repair technologies for oil and gas pipelines at home and abroad is introduced, and the construction process and characteristics of traditional plugging technologies for oil and gas pipelines and new intelligent internal plugging technology are analyzed. It is clear that intelligent internal plugging technology has better applicability for high-pressure oil and gas pipelines. The relevant theoretical results play a positive role in promoting the development of domestic safe pipeline plugging technologies.

Key words: oil and gas pipeline, internal plugging, plugging technology, intelligent plugging device