Rupert Sutherland, GNS Science
and Victoria University of Wellington
John Townend, Victoria University
of Wellington
Virginia Toy, University of Otago
DFDP-2 drill site from the bridge over Whataroa River.13/11/14. Photo R. Sutherland. |
Obtaining and maintaining the right drilling equipment has proven tougher than expected and we are now several weeks behind schedule.
The current drilling method we are using breaks the rock into small pieces (cuttings) and creates a 215 mm diameter open hole. It is a similar method to that employed by the petroleum industry, but we are drilling into a much harder rock than they typically encounter. Hard rocks similar to our site are commonly drilled by mineral explorers (e.g. gold miners), but they usually collect rock cores and drill a much smaller (<125 mm) and shallower hole. It is hard to find a drilling company with such overlapping experience. The NZ contractors we have on the job (Webster Drilling and Eco Drilling) have been very helpful and are learning with us.
This video shows you what the business end of our open hole drilling gear looks like:
We reached 547 m depth last Wednesday (17/11/14), but progress was slow and equipment was damaged. A decision was made to remove all drilling equipment from the hole, send it to Christchurch for a makeover, and obtain new specialised drill bits. The new roller-cone drill bits have hardened points to shatter the rock, but they need several tons of weight on them to be effective.
We hope to start drilling again tomorrow.
Primary funders of the DFDP-2 project
are: the International Continental Scientific Drilling Program (ICDP), the
Marsden Fund of the Royal Society of New Zealand, GNS Science, Victoria
University of Wellington, and the University of Otago.
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it is important to have the right drilling equipment. You never know what materials you will have to drill through as you break the surface of the earth. I never knew that there were machines that make small cuttings as you talk about it.
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