Evaluation of formation drill-ability anisotropy has important effect for preventing deviation of straight holes and planning drilling trajectories of directional Wells.

地层可钻性各向异性评价在直井防斜以及定向井井眼轨迹控制中具有重要的意义。

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To bring forward relatively drillability conception to different drill bit style contemporary, and build they way to predict formation drillability by earthquake wave rate.

同时针对不同钻头类型提出地层相对可钻性的概念，并建立地震层速度预测地层可钻性的方法。

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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。

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Drillers also use sensors to detect particularly promising rock intervals within the formation, and are able to move the drill string up or down, left or right as they drill through the horizontal section to target those intervals.

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First of all, the relief valve is the final and most assured final step -- that would be to essentially drill down the 19, 000 feet to where the formation is and to block off the well that is now open.

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Horizontal Drilling now allows these same operators to drill and set pipe for a mile or more horizontally through this same rock formation.

FORBES: Horizontal Drilling: A Technological Marvel Ignored