Methods and systems for drilling auxiliary holes

摘要

Systems and methods for drilling auxiliary holes such as conductor holes, ratholes, and mouseholes useful in drilling operations. The systems and methods include the use of a portable drilling apparatus that is selectively mountable on a rig's drill floor and is removable after an auxiliary hole has been drilled. A movable drive unit is pulled down by a cable system forcing the drive unit down and thereby facilitating drilling of the auxiliary hole.