The rock abrasiveness is determined with various methods, which results in no uniform standard formed. In order to predict the PDC bit wear and the abrasiveness of complex strata, the force analysis of the PDC broken rock was carried out, and the bit axial load and torque were obtained, respectively. Then, the calculation model of PDC special energy consumption is deduced. Combining the typical distribution patterns of different strata, the specific energy prediction model of complex strata is established. The wear coefficient of PDC is obtained by the relationship between the triaxial compressive strength of rock and the specific energy of rock breaking, and the grading coefficient and grading standard of abrasiveness of the composite formation are derived, which led to the grading coefficient and grading standard of complex strata abrasiveness. The field test of a well in the north of Songliao Basin verified the rationality and effectiveness of the abrasiveness grading standards and provided the basis for the selection and design of the bit.

用各种方法确定岩石的研磨度，这导致没有形成统一的标准。为了预测PDC钻头的磨损和复杂地层的磨蚀性，对PDC碎石进行了力分析，分别得到了钻头的轴向载荷和扭矩。然后推导了PDC特殊能耗的计算模型。结合不同地层的典型分布模式，建立了复杂地层的比能量预测模型。通过岩石三轴抗压强度与岩石破碎比能的关系，求得PDC的磨损系数，推导了复合地层的分级系数和磨料的分级标准，得出了分级系数和分级标准。复杂的地层磨蚀性。