Study on rock mechanics of deep wellbore, especially on rock drillability and rock anisotropy is a key project to resolve the problems of deep or ultra-deep well drilling.

深部井眼岩石力学的研究，特别是深部井眼岩石可钻性和岩石各向异性的研究，是解决深井、超深井钻井关键技术的重要课题。

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During ultra deep well drilling, we will be confronted with high temperature, high pressure and complex produced fluid.

但在超深井钻井过程中，面临地层高温、高压、产出流体相态复杂，这对环空携岩和安全是一个严峻的考验。

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Based on the multivariable random drilling model, the multi objective reliability optimization of deep well drilling parameters is presented.

在多元随机钻井模式理论的基础上，提出了深井钻井参数多目标可靠性优化方法。

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The effort, called a "top kill, " involved plugging the ruptured deep-sea well by pumping heavy drilling fluid into it from the surface, nearly a mile above.

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That amount is less than the company will spend in drilling its ultra-deep Lineham Creek well in Louisiana that I wrote about last week.

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The drill ships and production platforms required to undertake such deep drilling are massive floating structures, much larger than the largest aircraft carriers and costing well over a half billion dollars (and close to a million dollars a day to rent).

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