They drilled three wells but got nothing out of them but dirt.

他们挖了三口油井，但是除了土以外，从油井里什么也没有得到。

youdao

The results in three wells in Shengli Oilfield show that the plug can improve efficiency of plug breakdown and reduce drilling time. The economic benefit is obvious and is worth of popularization.

胜利油田三口井的应用表明，该胶塞易被钻头破碎，节省钻井时间，经济效益非常明显，值得推广应用。

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The three wells have different functions.

这三眼井啊是有分工的。

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Three years after Mister Lowell's book was published, H.G Wells published his famous book "War of the Worlds."

VOA: special.2010.07.11

Fifteen years ago, prospectors considered themselves lucky if they hit oil on one of every three wells drilled.

FORBES: Optimistic on oil

Three Agora wells are currently operating - two exploration wells (Skarfjell and Cladhan South) and one appraisal well (Tybalt).

BBC: Cairn Energy buys Norwegian oil company Agora

There are essentially three deep wells of Democratic cash in the country: New York, Los Angeles, and Silicon Valley.

NEWYORKER: Schmooze or Lose