Based on the same design as the innovative Z-Reamer, the Drillstar S-Reamer is a hydro-mechanically activated underreamer with significant advantages over other modern underreamers. Like the Z-reamer, the S-Reamer provides 'one bit size up' reaming (or about 50% of pilot size) in even the smaller hole sizes (6 in. and below). The S-Reamer features reaming blades with a dense front and back-reaming cutting structure, as well as a long gauge length. This provides optimal lateral stability to minimize vibrations, improving cutter life and ROP. The S-reamer is a sturdy tool, tested to perform In harsh drilling environments while remaining simple enough to be maintained in the field with few spare parts and hand tools, reducing turnaround time between runs and improving reliability.

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