Back Reamers (Digout Subs)
The Matrix Back Reamer (Digout Sub) has multiple functions. First, it helps prevent premature wear to the RC DTH Hammer. The second function of the back reamer is to in fact “back ream” the borehole. This is necessary in the event the borehole wall is unstable and experiencing partial collapse and assists the driller in removing the drill string from a tight borehole. The Back Reamer is positioned between the RC DTH hammer and the first RC Drill Rod. The back reamer consists of an outer body and an inner lift tube. When the inner lift tube of the Back Reamer shows signs of deterioration it can be easily replaced.