This probably automatically shuts down the pipeline. An inspection is likely in order. If a visual inspection finds nothing, they will probably run an intelligent pig through the pipeline.
Nah, the pipeline was built for this. It’s still pumping and they run pigs thru all the time!
"A cleaning "pig" for a 28-inch oil pipeline. The blue plastic disks seal against the inside of the pipe to propel the device and to remove loose sedimentation or scale buildup. The black rectangles at the top and the circular disks in the center are magnets to attract and remove any loose metal objects in the pipe." They can squeak and squeal when being rammed through the pipeline. (I had to look it up.) https://en.wikipedia.org/wiki/Pigging