Drug type Under Reamer

The drug-type under reamer (DTU) is designed to run in conjunction with a drill bit or a bullnose, depending on pilot hole condition or project objectives. The DTU's three retractable cutting arms are opened and held in position by continuous hydraulic pressure. Cutters are retracted by disengaging the pump, allowing the tool to be repositioned for selective under reaming operations or retrieval from the well. This simple and efficient design, with each arm machined out of a single piece of high-strength alloy, ensures longer tool time at bottom and easy field maintenance.