Provide pin to avoid sealing at midway and protect seal part of packer, enhanced reliability of plugging string.
设计有防中途坐封的销钉，保护封隔器的密封件，提高了封堵管柱的可靠性。
The improved sealing cup-type plugging technology has remarkable social benefit and economic benefit.
改进后的皮碗式封堵技术经济效益和社会效益显著。
A new sealing cup has been developed, and the problems of gas leak and iron filings accumulation existing in former sealing cup-type plugging have been solved.
研究出新型皮碗，解决了原皮碗式封堵存在的燃气泄漏和积存铁屑问题。
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