First geothermal job for Drillstar's PDC Underreamer : an UR575 was successfully used to enlarge the 6" production section to 12 1/4" on Piaseczno GT-1 well near Warsaw, Poland. This example highlights the capabilities of Drillstar's UR range for XXL borehole enlargement (>100% increase in borehole size). A performance beyond the reach of other reaming tools. See all the news