Digga Australia

Head Office Australia
4 Octal Street,
Yatala Qld 4207
Email: info@digga.com
Web: www.digga.com

QLD Brisbane
Ph: 07 3807 3330
Mob: 0419 856 274

NSW Sydney
Ph: 02 4647 1400
Mob: 0418 996 420

VIC Melbourne
Ph: 03 9706 6171
Mob: 0408 753 590

WA Digga West
Ph: 08 9457 1544
Mob: 0407 428 247

QLD Sunshine Coast
Ph: 07 5493 4850
Mob: 0421 598 647

Pendulum Drilling

Australian Pendulum Drilling Assembly & Attachments

Pendulum Drilling is one of the most effective and conventional drilling procedures. It is ideal for maintaining verticality while drilling salt, dipped or faulted formations. When drilling with a pendulum assembly, a stabilizer is placed 30 to 90 ft. above the drilling bit. A Pendulum drilling assembly includes a fixed blade stabilizer, which acts as a fulcrum for the drilling bit, and the drill collars.

The weight of the drill collars causes the drilling bit to pivot downwardly wider the force of gravity on the drill collars to drop hole angle. However, weight is required on the longitudinal axis of the bit in order to drill. The sag of the drill collars below the stabilizer causes the centreline of the drilling bit to point above the direction of the borehole being drilled. If the inclination of the borehole is required to decrease at a slower rate, more weight is applied to the drilling bit. The greater resultant force in the upward direction from the increased weight on the drilling bit offsets part of the side force from the drill collar weight causing the borehole to be drilled with less drop tendency. Often, the pendulum assembly is used to drop the direction of the borehole back to vertical. The pendulum assembly’s directional tendency is very sensitive to weight on the drilling bit. Usually, the rate of penetration for drilling the borehole is slowed down dramatically in order to maintain an acceptable near-vertical direction.

Digga are the pioneers of Pendulum Drilling in Australia, and the producers of the largest range of compact Hi-torque planetary drives for the Pendulum drilling & attachment industry. Digga have been a constant winner in customer satisfaction in terms of pendulum drilling drives and attachments. Resultantly, many of the national and international customers rely on Digga earthmoving equipment over its competitors.