Cable Tool/Rotary Drilling Underreamer
Many underreamers both in Rotary drilling or Cable Tool are either significantly expensive or clumsy and ineffective. Big Iron’s current Cable Tool/Rotary Drilling Underreamer can be used with either a Cable Tool rig or a Rotary rig and is very effective and relatively speaking is inexpensive.
Although the product has been developed, it is not on the market at this time and won’t be probably for a little while yet.
We can keep you posted. Of course, the purpose of the underreamer for both the Cable Tool and Rotary drilling operations, under cut the formation below the surface casing so that the surface casing can be moved freely through hard layers of formation to get the bottom of the surface casing to a point where the driller wishes to have the surface casing placed.