国内进行了螺旋钻进和常风压空气钻进的尝试，但效果一般。
In China, the screw drilling and the normal pressure compressed air drilling were conducted for trial and the results were not so good.
钻机可适用多种钻进工艺方法，如合金回转钻进螺旋钻进潜孔锤钻进跟管钻进等。
8 the rig is suitable for various drilling methods such as carbide bit drilling, auger drilling, DTH hammer drilling, follow - up casing drilling, etc. 3.
将仿生非光滑理论应用于螺旋钻头设计上，以解决粘性土钻进中螺旋钻头阻力大、粘附严重的难题。
The bionics theory was applied on the spiral bits, and then a non-smooth spiral bit was designed and processed for carried out the problem of serious sticking.
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