The the oil companies can tell you why: it's because drilling straight down is a lot easier.

石油公司知道你为什么会这么做：因为垂直钻井容易多了。

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A lot of drilling techniques, acid stimulation and compressive fracturing techniques effectively protected and stimulated the performance of reservoir.

应用多项钻井工艺技术和酸化压裂改造技术有效地保护和改善储层性能。

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During offshore drilling operation, a lot of wastes are produced, such as polluted water, gas, solid waste and harmful noise, which damage to the environment around the drilling operation area.

在海上钻井的生产过程中会产生大量的固体废弃物、废水、废气及噪声污染，将对作业海域造成一定的危害。

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American companies have a lot of technical expertise in drilling oil, especially deepwater oil.

WHITEHOUSE: Press Briefing

If you remember the conversation that was being had, a lot of people treated offshore drilling as a panacea to solve all of our problems as it related to energy.

WHITEHOUSE: Press Briefing

Drilling has changed a lot since then.

FORBES: New Federal Fracking Rules Look Reasonable; Enviros Not Satisfied