The gathering and transportation system of the Southern Oilfield has been in service for an extended period. Influenced by factors such as the regional environment, climate, internal conveying medium, and pipe material, inspections and investigations have revealed varying degrees of corrosion thinning in some pipelines. The safety hazards associated with these pipelines are becoming increasingly prominent, posing a significant constraint on production. Moreover, pipeline leaks could lead to environmental pollution incidents, resulting in adverse impacts. To ensure the safe operation of the pipelines, internal lining repair is being implemented on those identified with safety risks. This project involves trenchless repair of a total of 20.89 km of pipeline.