钻头

In order to solve the problem of low efficiency and short service life of hot pressed diamond bit when drilling in hard and compact formation, relations between diamond exposure of hot pressed bit and rock abrasiveness were analyzed in this paper. Research on matrix performances of hot-pressed diamond bit was firstly carried out.

针对在硬而致密岩石中钻进时效低的难题，本文分析了碳化钨基热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系，认为钻头的胎体成分及其性能是关键，硬而带脆性的胎体性能有利于全刚石出刃，从而能提高钻进速度。

On this basis,the PDC bit's fivepoint survey theory is developed,and a series of formulas are derived,applying PDC bits' geometry and analytic space geometry.

在此基础上，运用PDC钻头几何学和空间解析几何学中的四点共面、行列式、坐标变换的知识，提出并推导出了PDC钻头的五点测绘理论及系列公式。

PDC Bit is used widely in the artesian well of oil field. In drilling, the waterpower is very important to the Bit.

PDC钻头在油田钻井工程中获得了广泛的运用，钻进过程中水力因素对钻头非常重要。

At. % possessed the longest cutting life which is 88 times of the life of uncoated drills.

时钻头具有最大的切削寿命，是未镀膜钻头的88倍。

This technique can meet requirement of drilling a well to the planned depth without bit replacement.

该技术可满足一只钻头钻至设计井深、中途不更换钻头的要求，而且对钻机无特殊要求，可实现对油层段的裸眼测井。

Aimed at the problems, the improvement measures of extracting the modes of drilling speed and operating life of the bit from field data by multiple regression analysis, then, turning the selection index actual value into the corrected...

根据本方法对江汉油田部分地区的钻头使用资料进行计算分析，结果表明，选型结果是合理的，本方法是可行的，文中对钻头选型和钻井参数优选的配合，以及岩石可钻性用于钻头选型等问题也作了一些探讨。

The adjustable stop has a drill bit engaging mechanism to selectively lock the adjustable stop the drill bit at a desired location to limit the dept that the drill may penetrate into the bone.

这种可调限位件具有钻头接合机构，用以将可调限位件选择性地锁定在钻头上的所要求的位置，以限定钻头穿入骨头的深度。

Experimental results show that the cement soil can be used as boring medium for model test. Under the same conditions, the drill-type and the screw-pitch have a great impact on the required torque. In the practical application, the optimal bit should be chosen based on engineering geological conditions.

试验结果表明水泥拌合土可作为螺旋挤土模型钻头的钻进介质；在相同成孔条件下，钻头钻进所需成孔扭矩随螺距及钻型呈明显变化，在实际工程应用中应根据地层条件选择较为优化的钻头。

Taiwan eagle, SUS SU bit, special-purpose stainless steel drill bits, drill bits Cinda America, NACHI Drilling Tsui, YAMAWAúand, TANOI field wells silk attack, die, OSG·machine, Japanto attack the rich, silk sheet, Cinda-feng steel reamer, OKAZAKI Japan Okazaki reamer, the brand-name file, standard file, saw blade, straw plate, AMADA sawing zone.

台湾鹰牌、SUS苏氏钻头，专用不锈钢钻头，美国信达钻头，NACHI钻咀，YAMAWA弥满和、TANOI田野井丝攻、板牙，OSG欧士机、日本富士丝攻、丝板、信达锋钢铰刀，OKAZAKI日本冈崎绞刀，各国名牌锉刀、标锉、锯片、秸碟，AMADA锯带等。

Using the method integrating geoscientific research with bit selection research, analysis is made on the stratigraphic-lithologic characteristics of all geological intervals in the area, the effect on bit selection and how to increase drilling speed is made clear. Based on the above, the conceptual profiled design for bit selection and drilling methods of all geological intervals is proposed on the basis of the stratigraphic-lithologic characteristics.

应用地学研究与钻头选型研究相结合的方法，对该地区各地质层段的地层产状与岩性特征进行了分析，获取了钻头选型对提高钻井速度影响的认知，提出了基于地层产状与岩性特征的各地质层段钻头选型及其钻井方式的轮廓化概念设计。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。