There is no plausible instinct, for example, that could impel a man to leave home, cut his hair short, and drill for hours in tight formation.
但在这些过程中并没有什么看似合理的本性能够驱使人们去做那些特定的事情，比如说离开家乡，剪短头发，然后时时刻刻都在密集的队形里操练着。
A new synthetic diamond impregnated matrix for drill bit used in hard formation is designed.
针对软硬交错、研磨性高的地层设计了一种新型人造金刚石混合孕镶块。
In this paper, through the analysis of complex formation and leakage features of adjustment well in Zhongyuan Oilfield, the result shows that antileakage is key to drill successfully adjustment well.
中原油田地层情况复杂，漏失量大，通过对中原油田调整井地层复杂情况及漏失特点的分析，认为防漏是复杂区块调整井成功的关键，主要体现在防漏技术、配方、密度、流变性能、固控、起下钻措施等方面。
PDC bits have been used to drill the homogeneous formation from soft to medium-hard, but they are not suitable for drilling in gravel and multi-interbedded formation.
PD C钻头用于软到中硬的均质地层钻进具有钻速高、寿命长等特点，但不适合含砾石地层和软硬交错地层。
Production experiment indicates that this kind of drill bit has ideal effect in the middle-hard broken formation and the soft-hard interlayer as well as in the gravel formation.
生产性试验表明，该类型钻头对于钻进硬而破碎地层、软硬夹层以及卵砾石地层均具有很好的使用效果。
In drilling engineering, drill pipe often sticks in salt formation because of wellbore shrinkage.
在钻井工程中，盐岩层井眼易发生缩径卡钻。
Igneous rock stratum in Daqing is the world-class difficult drilling formation. The rock drilled in the stratum have high drillability value and poor adaptability with drill bit.
大庆油田火成岩地层是世界级难钻地层，钻进过程中该地层岩石表现为可钻性值极高，地层与钻头适应性差。
Our country is rich in depth oil and gas accumulation resources. It is difficult to drill the deep well and hard formation where the exploration and the development meets.
我国存在丰富的深层油气藏资源，勘探和开发所遇到的难题就是钻深井硬地层。
Our country is rich in depth oil and gas accumulation resources. It is difficult to drill the deep well and hard formation where the exploration and the development meets.
我国存在丰富的深层油气藏资源，勘探和开发所遇到的难题就是钻深井硬地层。
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