During the geothermal well drilling,to encounter of hard and brittle strata is very often,especially the Jurassic andesite and tuffs.
在地热井施工过程中,经常钻遇硬脆地层,特别是侏罗系安山岩、凝灰岩地层,钻进过程中产生严重跳钻现象,个别地层还产生H2S气侵,造成钻铤频繁断裂。
Parameter selection for diamond drilling in hard rocks;
坚硬地层金刚石钻进参数的选择
Design of PDC bit for hard formation;
硬地层PDC钻头设计的探讨
PDC bits are generally inadaptable for drilling hard formation,especially for the gravel layer with high compressive strength and abrasion.
PDC钻头不适宜钻硬地层,尤其是高强度、高研磨性的砾石层,因为在极其恶劣的工作条件下,PDC齿的冲击破损严重,热磨损及磨料磨损往往同时存在,齿的磨损速度快,钻头的工作寿命急剧缩短。
Improving the drilling rate of hard formation is always a problem in the world.
为了解决提高硬地层钻井速度的钻井难题,以粒子冲击钻井系统的整个工艺流程为依据,论述了粒子冲击钻井技术的优点和缺点,阐述了其破岩机理。
For the research on characters of cemented soil of SMW(soil mixing wall) technology in medium-hard strata is shortage,so the application in medium-hard soil is restrained.
针对SMW工法缺乏对中硬地层的水泥土性能研究,利用首例北京地区在中硬地层中地铁基坑工程采用SMW工法搅拌后的水泥土,进行了三轴压缩试验。
Study on Impregnated Diamond Bit's Optimal Design for Hard Formation
适合坚硬地层孕镶金刚石钻头优化设计研究
they found a bed of standstone.
这一地层的岩石非常坚硬。
a hard glossy coating.
一种坚硬光滑的涂层。
A large section or block of the earth's crust that is more rigid than the surrounding rock and has been moved or displaced as a unit.
断层地块一大块比周围岩石更坚硬的、曾发生过整块位移的地壳
form a crust or a hard layer.
形成一个硬壳或坚硬的层。
a rigid layer of the lithosphere that is believed to drift slowly.
地球岩石圈中非常坚硬的一层，被认为在缓慢漂移。
A thin, resistant limestone escarpment is present just basinward.
薄层状的坚硬的石灰岩山崖正好位于靠盆地一侧。
Hard strata transmit shock waves more efficiently than loose earth.
质地坚硬的岩层传播震波的效率比松软的土壤高。
These meteors may be exceptionally hard, and they may penetrate far into the atmosphere.
这些流星可能会异常坚硬，因此也许会深深地穿入大气层。
Application of SYZX75 Wire-line Coring Hydro-hammer in Hard Compact "Skid" Formation
SYZX75型绳索取心液动锤在坚硬致密“打滑”地层的应用
The solid part of the earth.
陆界地球的坚硬部分
The sun baked the ground hard.
太阳将地晒得坚硬。
The sun baked ground hard.
太阳把大地晒得坚硬。
incrustations of barnacles on the hull
藤壶附在船身上形成坚硬的外层.
used to form a hard coating on a porous surface.
用在多孔表面形成坚硬的涂层。
a paint that provides a hard glossy transparent coating.
能提供一种坚硬平滑的透明外层的漆。
The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle.
板块结构理论描述岩石圈的运动。 岩石圈是相对坚硬的地球外层，包括全部地壳和部分地幔。
solid, marshy, stony, etc ground
坚硬的土地、 沼泽地、 多石的地.