Determining drillability of the rocks in a well bore is directly related to the selection of bit type and the forecast of penetration rate,but the existing microdrillability test for studying rock drillability has quite much troubles.

• 对井剖面地层岩石可钻性的确定直接影响到钻头选型和钻速预测，然而，现有的研究岩石可钻性的微可钻实验存在较多问题。