Method and Device for a Running Tool
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United States of America Patent
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app pub date -
Feb 23, 2015
filing date -
Mar 8, 2004
priority date (Note) -
Abandoned
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Abstract
A method and device for drilling or cleaning an underground borehole. The device includes a drilling tool, a drill string with two pipe conduits extending up to the surface and an arrangement for providing one drilling fluid for circulation in a drill string and a second arrangement for providing a second fluid in an annulus formed between the drill string and the wall of a borehole making the drill string approximately weightless.
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