当钻探公司们发觉他们遗漏了多少石油后，技术才有了真正的突破。你瞧，石油储备区可能延绵数英里，但是当钻头垂直钻入时，油井只能开采到附近区域的一点石油。

So, the oil companies changed their tactics. Instead of drilling down for oil, they started drilling diagonally and even horizontally!

所以，石油公司改变了策略，他们不再朝下钻石油，而时开始采取对角式、甚至水平式钻取法！ This "directional drilling" has several advantages:

这种“定向钻取”的优势如下:

* It provides access to a large-cross section of a well, instead of just a narrow, vertical shaft.

提供了一个大的油井截面，而不只是一个狭长竖井。

* It makes it possible to reach oil deposits that can't be reached vertically - like those under a town or a lake.

让人们可以获得在垂直方向上无法获取的石油资源，比如在城镇下方或湖下。

* It reduces the number of times oil rigs need to be moved. When one well runs dry, another can be drilled in another direction (instead of moving to a new spot).

减少了石油井架的搬运次数。当一口井干了，可以朝另一个方向钻新井（而不用挪到一个新的地方）。

Drilling horizontally opens up new oil resources that would otherwise go untapped. In other words, it can make dry wells fruitful again.

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