These provide access to the central bore of the well underneath most of the heavy valves which should have closed off the flow of oil, but for some reason did not.

这些为连接在许多沉重的真空阀下的钻井中心的钻孔提供了条件。这些真空阀本应该阻止石油的外泄，但出于某种原因没有做到这一点。

youdao

In sticky oil production, economy, efficiency, environmental protection for well bore to reduce density is very important.

在稠油开采中，经济、有效、环保的井筒降粘技术是十分重要的。

youdao

Application of insulation tech for well bore breaks off the heat exchange which is economic and efficient, and has gained a satisfied effect in test for dense oil well of Bohai oilfield.

井筒保温管技术的应用，阻止式隔绝了热交换的发生，经济、有效，在渤海稠油井测试中取得了满意的作业效果。

youdao

These provide access to the central bore of the well underneath most of the heavy valves which should have closed off the flow of oil, but for some reason did not.

ECONOMIST: The Gulf oil spill