| 单词 |
differential fill-up collar |
| 释义 |
differential fill-up collar differential fill-up collar[‚dif·ə′ren·chəl ′fil ‚əp ‚käl·ər] (petroleum engineering) A mechanism installed in the bottom of a well, when casing is set in a drill hole that automatically admits drilling fluids into the casing as required. |
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