Therefore a PDC bit with new compound cutting structure is developed in the light of the characteristics of gravel formation and soft-hard interbedded formation.

• 鉴于此,针对含有砾石和软硬交错地层的特点,提出了混合切削结构设计,并制造了新型PDC钻头,在含砾石的地层和软硬交错地层中取得了较好的使用效果。