He'd been drilling vertical Wells in the Permian since 1979 with only modest success.

他在1979年就已经在二叠盆地钻探直井，但是只取得了少许成功。

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Because of deflection and unsymmetrical space around in horizontal and deviated Wells, downhole flow status is much different from vertical Wells.

水平井、斜井由于井身倾斜以及井筒周围空间的非对称性使井下流动状态与垂直井极不相同。

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These cases occur most often in horizontal Wells, or vertical Wells with the combined effects of invasion and large resistivity contrast between beds.

这种情况常出现在水平井或者有侵入影响并且层间电阻率对比度高的直井中。

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The method is more costly, but also may produce 2.5 to 7 times the reserves of vertical wells, according to some experts.

FORBES

The study recommended a minimum vertical separation distance between fracking wells and water supplies of 600m (2, 000ft).

BBC: Fracking: Untangling fact from fiction

Fracked wells have been known to gush at 100 times the initial rate of an average vertical well.

FORBES: Will Natural Gas Stay Cheap Enough To Replace Coal And Lower US Carbon Emissions