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石油钻井和开采作业的对象是地层岩石，水力冲蚀破岩（压裂）又占有十分重要的位置。然而，对于不同物理力学性质的岩石与水力冲蚀破岩的内涵关系和定量指标，还没有进行系统的研究。文中针对这一问题，根据石油工程岩石特征，以岩石物理力学性质为基础，通过理论分析和大量的室内实验研究，把石油工程岩石分为４大类１１种。以岩石的抗压强度为定量指标，找出了不同岩石类型的水力冲蚀破碎的定量关系，其水力临界值压力系数在０１７２～０２６９之间，并提出了石油工程作业的水力压力值的设计计算式，实验得出了水力冲蚀岩石的滞后临界时间，为石油工程作业提供了理论依据和设计方法。
Oil drilling and mining operations target the formation of rock, hydraulic erosion rock breaking (fracturing) and occupy a very important position. However, there is no systematic research on the connotation and quantitative indexes of rocks with different physical-mechanical properties and rock-breaking by hydraulic erosion. In this paper, according to the rock characteristics of petroleum engineering, based on the physical and mechanical properties of rocks, through theoretical analysis and a large number of laboratory experiments, the petroleum engineering rocks are divided into 4 major categories and 11 types. Taking the compressive strength of rock as a quantitative index, the quantitative relationship between hydraulic erosion and fragmentation of different rock types was found. The hydraulic pressure coefficient of critical value ranged from 0172 to 0269. The hydraulic power of hydraulic engineering The calculation formula of pressure value, the experimental critical time of hydraulic erosion of the rock lag, provided the theoretical basis and design method for the petroleum engineering operation.