تعريف core drilling في الإنجليزية الإنجليزية القاموس.
Core drills are 3- and 4-fluted cutters used to enlarge previously drilled core or pierced holes
The process by which a cylindrical sample of rock and other strata is obtained by using a hollow-drilling bit that cuts and retains a section of the material penetrated
Mobile drilling rigs, sometimes mounted on trucks or transported by helicopter, provide cores of rock which are analysed by geologists The cores provide detailed information on rock formation and structure and geochemistry
The process to recover core samples of rock or sand formations A tube with cutting edges on the bottom circumference is lowered into the well bore on the drill pipe and rotated to cut a cylindrical sample