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How does earth drilling work?

  1. Aug 6, 2015 #1
    i knew during geology survey, they can drill into earth thousands of meters below the surface. just curious how did they accomplish that?
     
  2. jcsd
  3. Aug 7, 2015 #2

    billy_joule

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    With very large drills :wink:

    Drill, add extension shaft ('drill string' apparently),drill again. Repeat ad naseum.

    http://science.howstuffworks.com/environmental/energy/oil-drilling4.htm

    wiki has this interesting note about the deepest hole ever drilled:

    https://en.wikipedia.org/wiki/Boring_(earth)

    https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole
     
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