Drilling and hole enlargement device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Mar 24, 2009
Grant Date -
Jul 19, 2007
app pub date -
Jan 18, 2006
filing date -
Jan 18, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An expandable drilling apparatus is deployed upon a distal end of a drillstring and includes a cutting head and a substantially tubular main body adjacent the cutting head providing a plurality of axial recesses configured to receive arm assemblies configured to translate between a retracted and an extended position. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.
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