Originally the preventer was linked to the Deepwater Horizon by a mile long vertical pipe called a riser, through which oil would flow.

最初，防喷器与深水地平线平台由一根一英里长的垂直管相连，这根管子叫做立管，石油既由此通过。

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The present paper discuses, with the method of matched asymptotic expansions, the stress boundary layer of the slender riser in a steady flow.

本文用匹配方法讨论定常流中细长立管所产生的应力边界层现象。

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Mathematical models for Fluid Catalytic Cracking (FCC) riser reactors were built generally on the basis of assumption of "plug flow" pattern within risers.

催化裂化提升管反应器数学模型基本上都是基于平推流反应器的假设建立起来的。

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And what we've done is submit a tool in the end of the riser to start to extract some of that flow and bring it directly to the drill ship so it never enters into the Gulf of Mexico."

VOA: standard.2010.05.17