It has been approved that the optimization of feeding pressure,drilling rate and drilling speed is the key to deepen holes and work safely under the condition of certain drilling machine and drillhole design.
为了避免在松软煤层中打深孔引发煤与瓦斯突出等灾害,保证施工安全,根据孔周围的应力应变分布规律,分析了松软煤层打钻时经常遇到的问题,总结了钻进工艺和参数与深孔成孔的密切联系,提出了打深孔的工艺措施和参数。
Drill for drilling wall anchor holes.
用于打钻墙壁锚栓孔的电钻。
Drill three holes in the floor/base plate for anchoring the leg.
在地面/底板上为锚固支柱打钻三个孔。
eggbeater PDC bit
打蛋器型PDC钻头
To make a hole in or through, with or as if with a drill.
钻，凿，开洞用或似用钻打洞或钻孔
To make a hole with or as if with a drill.
钻孔用钻或类似钻的工具打洞
A hole or passage made by or as if by use of a drill.
钻孔，打洞用或似用钻打孔或通道
To make a hole in or through something with or as if with a drill.
钻孔，打洞用或似用钻打洞或穿孔
wash-and-drive method
边冲出钻屑边打入套管钻进法
You plan to start tunneling?
你也打算开始钻洞吗？
5.2 Slug the pipe with two cubic meters of mud before pulling out.
起钻前打进两方重泥浆。
8.6 The company has decided to plug the well for side tracking.
公司决定：打水泥塞侧钻。
To make a hole in (a hard material) with a drill
用钻头在(硬材料)上打孔.
An awl with a beveled tip, used to make holes in wood for brads or screws.
锥钻，打眼钉钻头倾斜的钻子，用于在木头上钻孔以钉角钉或螺钉
Adversity is the diamond dust with which life polishes its jewels.
逆境之于生命，犹如打磨首饰的钻石沙。
He makes a small hole in the belt with a leather punch.
他用打孔器在皮带上钻了一个孔。
This portable rig can only drill 15m deep holes.
这台人抬钻机只能打15米深的井。
He make a small hole In the belt with a leather punch
他用打孔器在皮带上钻了一个孔
When was the first offshore oil well drilled?
第一口滨海油井是什么时候打的钻？