Telescopic drilling method
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United States of America Patent
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-
Mar 9, 2004
Grant Date -
N/A
app pub date -
Apr 25, 2002
filing date -
Apr 26, 2001
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A telescopic drilling method includes the steps of drilling an outer bore through a surface, inserting a hollow outer conduit into the outer bore, and at least partially inserting a first hollow inner conduit through the outer conduit. Next, the method includes the steps of preventing the first inner conduit from moving longitudinal with respect to the outer conduit engaging a rotatable inner drill bit with a ring drill bit and further drilling the outer bore using a unitary drill bit head to a successive depth. The inner drill bit is disengaged from the ring drill bit and a second end of a successive hollow inner conduit is attached to a first end of a preceding one, and the preceding inner conduit is unclamped.
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