top driven

The research works on the structural characters, working mechanism and structure emulation of a drilling-workover dual-purpose top drive device which is driven by full-hydraulic way and can satisfy the operations in slim-hole drilling, directional drilling, side-tracking and well workover, etc.

文章介绍了一种能满足小井眼钻井、定向井、侧钻井及修井等作业的全液压驱动方式的钻修两用顶部驱动装置的结构特点、工作机理和结构仿真研究工作。

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Comparative Analysis of Electric Drive top drive drilling system and hydraulic driven top drive drilling system.

对比分析电驱动顶驱和液压驱动顶驱.

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Internationally, through development sports industry organizing boutique sports events to sports as leading driven urban economy development, build urban card case abound which organize top tournament became global urban managers shaping city image choice for.

在国际上，通过发展体育产业、举办精品体育赛事，以体育为龙头带动城市经济的发展、打造城市名片的案例不胜枚举，其中举办顶尖赛事成为全球城市管理者塑造城市形象的不二之选。

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The Color Wheel The helical plate tooth threshing cylinder, the top thresh fan and the undershot fan are connected and driven by a vertical shaft.

该机以一根立轴联接螺旋板齿脱粒滚筒、上排杂风扇和下轴流风扇，并驱动其旋转。

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When the top surface of the melt is free surface, two roll cells with opposite direction are observed in the melt driven by both the surface tension gradient on the two free surfaces.

当熔体顶部为自由表面时，由于上下自由表面张力的作用，在熔体内部会形成两个流动方向相反的流胞。

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On top of this, soaring prices for basic construction goods like steel and concrete have driven costs up.

此外，高涨的钢铁和水泥等基础建筑物资价格，已经推升了开发成本。

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