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.
该设备采用高压射流钻井工艺，具有钻进效率高、钻具结构简单、设计合理等特点。在两次现场试验中，成功地实钻了三眼定向孔。
The equipment applies high voltage jet drilling process, with characteristics of high drilling efficiency , simple structural drilling tool and reasonable design.
分析了因模具结构造成钻齿类合金压坯分层的原因，提出了改进模具结构设计的措施。
Analysis is made of the reasons of layering in compact of drill tooth alloys due to the die structures. Measures are taken to improve the die structures.
通过对轴承钻油孔夹具结构的改进，使钻油孔夹具内径与外径定位兼备，扩大使用范围，降低制造成本。
The fixture used for oil hole drilling has both ID and od location by improving the structure of the fixture, so as to expand application scope and reduce production cost.
分析了因模具结构造成钻齿类合金压坯分层的原因，提出了改进模具结构设计的措施。
Analysis is made of the reasons of layering in compact of drill tooth alloys due to the die structures.
本钻夹具结构紧 凑、钻孔定位精确、操作简便。
The drilling fixture has the advantages of compact structure, precise drill positioning, and simple and convenient operation.
本钻夹具结构紧 凑、钻孔定位精确、操作简便。
The drilling fixture has the advantages of compact structure, precise drill positioning, and simple and convenient operation.
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