从钻油气井的角度来评定硬地层,一般指硅质胶结的石灰岩,致密石英砂岩以及含燧石的地层;而普通的石灰岩、白云岩等均视为中硬地层。硬地层的存在有地区性,往往在钻井剖面的某一井段或某几个井段出现,而且坚硬程度也有所不同。灰岩地层钻井,根据其岩层特性及储层特性,具有一般钻井的共同性,也具有它的特殊性,甚至特殊的地区性。优质快速钻井的实现,是由许多互相配合的因素的正确合理组织实践的结果,因此 The evaluation of hard formations from the perspective of oil and gas well drilling generally refers to siliceous cemented limestone, dense quartz sandstone and chert formations, while common limestone and dolomite are considered as medium hard formations. Hard formations are regional in nature and tend to occur in a well section or in a few well sections of a drilling section and vary in hardness. Limestone formation drilling, according to its rock properties and reservoir properties, has the commonness of general drilling, but also has its particularity, and even special regional. The realization of high-quality fast drilling is the result of the correct and reasonable organization of many interdependent elements, and therefore