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1)  massive and hard to grind layer
坚硬致密弱研磨性岩层
2)  hard and compact rock formation
坚硬致密岩层
1.
Optimized design and tests were made on bit matrix formula,diamond parameters and bit nozzle to overcome slow drilling footage and short service life of the wire-line coring bit in hard and compact rock formation,the newly developed bit(S77),with good adaptability,overcame the drilling "sliding" in extra-hard to hard and mid to weak-abrasive rock formations.
为了克服绳索取心钻头钻进坚硬致密岩层出现的进尺缓慢、钻头寿命短的难题,着重从钻头胎体配方、金刚石参数、钻头水口等方面进行优化设计、试验并生产应用,使研制的绳索取心钻头(S77)具备良好的适应性,钻进坚硬~硬、中~弱研磨性岩层克服了"打滑"现象并延长了钻头的寿命,取得了一定的经济效益。
3)  Extremely hard and highly abrasive rock
极坚硬高磨蚀性岩层
4)  hard and compact rock
坚硬致密岩石
1.
The most difficult problem of drilling in hard and compact rocks is that drilling efficiency is very low.
针对坚硬致密岩石钻进中遇到的钻头打滑、钻进效率低的问题,通过改变弱包镶材料,加入强化的石墨颗粒,进行试验与研究,获得了颗粒状石墨能提高金刚石出刃的初步效果。
5)  Yanzhou Coal Field
坚硬岩层
1.
Application of hard rock drilling process at construction of Yanzhou Coal Field;
坚硬岩层钻进工艺在兖州矿区施工中的应用
6)  Hard solid rock
厚坚硬岩层
补充资料:致密性试验
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CAS号:

性质:为检查容器各连接部位和焊缝的密封性能,以保证容器在使用压力下保持压力恒定,严密不漏而进行的压力试验或液体渗透试验。当前致密性试验有气密试验、氨渗漏试验、煤油渗漏试验和氦气渗漏试验等。

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