假如现在这个比率是最低的、并且放在防喷器上方的关键性管道适应了高帽之前、仍然保持低比率，那时候泄漏的油约相当于现在已经漏掉量的一半。

If the rate is at the low end of the range and was lower still before a key pipe on top of the blowout preventer was cut to accommodate the top hat, about half as much oil has been spilled so far.

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为抽油杆柱组合、扶正器、防脱器安放位置及数量设计提供了更加合理、完善的理论依据。

It provides a reasonably and completely theoretical basis for combination of rods, centralizer, assembling site and number of depart device.

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