Low penetration as well as drilling incidents of high frequency resulted from problems caused by leakage, gas migration, collapsing sticking, well kick, blowout and so forth.

且常发生井漏、气侵、坍塌性卡钻、井涌与井喷等井下复杂问题，导致机械钻速低与钻井事故频发。

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The optimal drilling site has to avoid possible areas of incoming water that would disturb the sediment, as well as areas of basal freezing, where lake water freezes to the underside of the ice.

最好的钻位是能避开有水的区域，因为水会破坏沉积物，也就是在完全冰冻的位置最好。

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It involved the construction of about 50,000 tube Wells in the fadama lands for small scale irrigation, as well as simplifying the drilling technology for the tube Wells.

项目的内容包括新建50000个机井，用于“发达玛”地带的小型灌溉，同时简化打井技术。

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The BP company pumped heavy drilling fluids,known as mud, into the top of its damaged well in the Gulf of Mexico.

VOA: special.2010.08.07

However, the industry is suffering from excess capacity especially in the standard specifications sector that is driving down fleet utilization levels as well as the pricing of drilling contracts despite the improving demand outlook.

FORBES: Getting Beyond Gulf Spill, Transocean Sails To $86

Previous clean energy investments by Google include eSolar Inc, which builds Concentrating Solar Power (CSP) plants, as well as AltaRock Energy and Potter Drilling, which use various techniques to optimize and develop geothermal energy sources.

FORBES: Is Google Becoming A Utility Company?

The Government of Flanders and the Tides of Time partnership have provided more than USD 3 million to date to help States and site managers face the growing challenges of pollution largely posed by underwater mining and drilling as well as maritime transportation.

UNESCO: House | United Nations Educational, Scientific and Cultural Organization