DENVER -- Varel International has launched the "high energy" series of roller cone insert bits.
The series was engineered to meet increasing demands on drill bits from greater weight on bit (WOB) and higher rotations per minute (RPM) for faster drilling, the company says.
The Varel team has developed a geometrically enhanced seal gland for increased seal reliability. This conical seal gland positions the seal to better handle pressure fluctuations and still maintain a preferred sealing location and interface. The series adds a heat shield disc between the seal and the inner bearing to act as a thermal insulator, protecting the seal. Both innovations have been field tested and have shown significant impact in extending the life of the bearing seal in various high input energy applications, the company says.
Varel has incorporated the V-Jet enhanced hydraulics package to the series, enabling aiming of the nozzle flow to achieve cuttings cleaning of the teeth without erosion of the bit's cones or the borehole wall.
High Energy series bits are available in diameters ranging from 7-1/2 to 13-3/4 in. (19 to 35 cm) and in IADC codes ranging from 417 through 837. All IADC code 537 and softer in this series include Varel's V-Jet hydraulics package.