A clean-out tool for cleaning out a well bore. The clean-out tool comprises a helical displacing member which is secured against rotation about a longitudinal axis thereof. A tubular barrel surrounds the helical displacing member and is rotatably journalled in a first bearing and a second bearing. A drive mechanism rotatably drives the tubular barrel. The tubular barrel comprises a hollow bit at a free end of the tubular barrel, the second bearing being provided within the hollow bit. The hollow bit is provided with scoop openings. In a method for cleaning out a well bore using such a clean-out the tool is completely lowered into a pre-formed well bore until the hollow bit engages debris or other material. The drive mechanism is activated to rotate the tubular barrel relative to the helical displacing member while the helical displacing member is kept stationary to convey debris or other material into the tubular barrel via the scoop openings and further into the tubular barrel. The tool is pulled out of the well bore and debris or other material is removed out of the tubular barrel.
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