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Natural gas is 何释布鲁塞尔easy to form hydrates under low temperature and high pressure conditions. Therefore, there will be "ice blockage" in the pipeline of ultra-deepwater gas field subsea pipelines during gas transmission, which will sharply increase the risk of "ball jamming" in pigging operations, making ultra- deepwater subsea pipelines Pigging operation is much more difficult than in shallow water oil and gas fields. During the "passing the ball" process for more than 72 hours, the "Shenhai No. progress, successfully completed the job.