... drill string assembly 钻柱组合 ; 钻具组合 drill-assembly 钻具组合 drill tool assembly 钻具组合 ; 钻具结构 ...
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本文对四类钻具结构进行了详细的分析，对关键部件及结构进行了研究和设计。
Detailed analysis is made of four categories of drilling tools with study and design of the key elements.
单动双层岩芯管钻具结构简单、操作方便、同轴度好、适用寿命长，能有效地提高岩、矿芯的完整度。
The swivel-tube barrel can effectively increase core recovery rato. suitable for drilling in formations in which oblique hole comes easy. It is effective to assure hole quality.
通过对底部钻具组合受力变形分析、地层力的计算及井壁变形影响分析，提出了钻具结构集度的概念和计算方法；
The concept and calculating method are suggested based on the deformation analysis of BHA, calculations of formation forces, and analysis of wal1 deformation effects.
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