顶封的英文

• closed top
• closed-top
• over seal

• 封:    close; seal
• 顶封头:    cover head
• 浮顶封:    float roof seal; floating roof seal
• 炉顶封闭:    top closure
• 箱顶封装:    desk top enclosure

例句与用法

1. The development and application of the upper isolation workstring
   顶封封隔管柱的研制与应用
2. Water shutoff agent dsz - a is composed of inorganic particle . its specialities are low cost , easily flow , high strength and long valid period . the agent suits non - selective water shutoff in sand formation . dsz - a not only can plug high water - bearing formation , but also can plug case leakage . dsz - a has been applied on site and gotten good effect . it is a agent which has wide prospect
   濮城油田推广应用顶封卡漏套管保护管柱,消除了环套空间水泥环窜漏影响,对漏点上部套管实施了保护,减少了无效注水,增加了有效注水,对应油井地下地质能量恢复后,增油效果明显