Drill Rig Substructure

The substructure is the steel construction including the work floor & rotary table, & constructed with enough strength to hold thousands of feet of drill pipe in a stand on top of it. It gives the rig additional stabilization. The weight indicator in the picture to the left of the driller lets the driller know the correct amount of weight on the drill bit; too much & drill bit can be damaged or get stuck, or too little & rate of penetration slows down & drilling is not efficient.