Horizontal Directional Drilling (HDD) Technology and Applications

摘要

@@ 1 What is Horizontal Directional Drilling?rnHorizontal Directional Drilling, accurately steered drilling, has become state -of- the -art drilling technique in the world. Specially- designed directionsteerable corebarrel and accurate direction measurement tool are available for the use together with wire line core drilling machine. That makes it feasible to extract cores and to measure the drill travel line &length while drilling in a curve.