Evolution of Tungsten Carbide Reamer
Hard Metals Australia, based in Hornsby, New South Wales, was first introduced to Trenchless Technology by local drilling company UEA in 2007. Director Keith Whittaker was looking for reliable hole openers with polycrystalline diamond composite cutters for use in Sydney Sandstone. Here, Trenchless Australasia takes a look how the Wombat Hole Opener was developed and how it has evolved.
Polycrystalline diamond composite (PDC) requires low cutting forces and has excellent wear resistant properties, making it ideally suited for drilling in Sydney sandstone, which is typically a soft to medium strength formation but highly abrasive.
A brief history
The first hole openers were fixed-wing and similar to others already being used in the market. The primary method of manufacture was fabrication and while they were effective and relatively inexpensive, maintaining accuracy of axial and radial run-out of the cutter segments always presented a challenge.
They were also limited being fixed-diameter, requiring a new tool built for even minor changes in bore diameter. Repairs and modifications could only be undertaken in a select number of engineering facilities throughout the country, often leading to drilling delays.
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