The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度
、
性强，钻头选型困难，特别是在密度条件下机械钻速低。
The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度、性强，钻头选型困难，特别是在密度条件下机械钻速低。
声
：以上例句、词性分类均由互联网资源自动生成，部分未经过
核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
