In many medium-hard rock stratums,carbide alloy bit and steel ball percussion tools can be used together for higher ROP and better coring result with borehole deflection preventing.

• 在大量遇到的中硬岩层中采用硬质合金钻头+球体冲击器实现回转冲击钻进可明显提高机械钻速和取心效果,并防止孔斜,具有很好的推广前景。