ABSTRACT
As a woodworker benefits from understanding about the grain and different characteristics of timbers (e.g. orientation, flexibility, hardness), it is important for the driller to know the materials that he will most likely encounter in the earth. A knowledge of geology is crucial when choosing appropriate equipment for a drilling business or project. The equipment is very expensive, and no single drilling method works best in all conditions. If the equipment chosen is wrong for the task, the driller is in for a hard, frustrating time.
