Conventional drilling method that uses augurs to penetrate the soil. As the augers are rotated, soil cuttings are conveyed to the ground surface via augur spirals. DP tools can be used inside the hollow augers.
HOLLOW STEM AUGER DRILLING
Meaning of HOLLOW STEM AUGER DRILLING in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012