This study looked at how to stop icy blockages in deep-sea gas wells off China. Gas hydrates can form and clog pipes, which is bad for gas extraction. Scientists tested three ways to prevent these blockages: using a chemical called MEG, adding anti-clumping stuff to the flow, and a new chemical called PVCap. MEG is common but needs careful dosing. The anti-clumping stuff reduces the risk of blockages. PVCap stops hydrates from forming - helping reduce the need for a lot of chemicals. This research gives useful tips for keeping gas flowing smoothly in the oil and gas industry.