Experimental Investigation of Drillability Indices of Thermal Granite After Water-Cooling Treatment

Understanding the drillability indices of thermal granite under various water-cooling conditions is of great significance for deep drilling and wellbore stability during the extraction of deep geothermal energy. In this paper, we report the results of micro-drilling tests, indentation hardness tests, friction-and-wear tests as well as conventional physico–mechanical tests on thermal granite after water-cooling treatment, and the relationships...