hi OPM,excuse my ignorance, but isn't a well head part of the...

hi OPM,
excuse my ignorance, but isn't a well head part of the hole and not part of the drill? meaning its left behind on top the the drill hole?(after all its called a wellhead not a drill head))??
genuine question, it may be we need a new well head because of the configuration of the drill. i notice in the pictures of the GT3000 that the drill is pretty close to the mast of the machine.
all comments appreciated.

happy