A Well Record should be prepared for each well that is drilled. The record is used to guide future drilling, to ensure that the well screen extends across the appropriate thickness of the aquifer and that the well casing/screen has been lowered to the bottom of the hole. It is also useful if there is ever a need to conduct repairs on the well in the future.
Well records document details of drilling a borehole and completing a well. Well records should include the driller's description of:
the geologic character of each formation;
the depth at which changes were observed;
the thickness of the various formations;
the drilling speed;
the depth to water or where water appears to have been reached;
the depth at which drilling was stopped.