Using normal diamond bits to drill the stratum, bit matrix endures big impact, then bit is abraded rapidly and its longevity is very low, then bit loses blocks easily, so improve the drilling cost.

• 普通金刚石钻头钻进中窜动厉害,对钻头胎体冲击大,钻头磨损特别快,寿命低,而且容易掉块,给钻进带来麻烦,使钻进成本上升。