Earth boring apparatus and method offering improved gage trimmer protection
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United States of America Patent
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Apr 26, 2005
Grant Date -
Apr 15, 2004
app pub date -
Oct 9, 2002
filing date -
Oct 9, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A rotary drill bit for drilling subterranean formations configured with at least one protective structure proximate to the rotationally leading and trailing edges of a gage trimmer, wherein the at least one protective structure is positioned at substantially the same exposure as its associated gage trimmer. Particularly, the apparatus of the present invention may provide protection for gage trimmers during drilling, tripping, and/or rotation within a casing; i.e., when changing a drilling fluid. Protective structures may be configured and located according to anticipated drilling conditions including helix angles. In addition, a protective structure may be proximate to more than one gage trimmer while having a substantially equal exposure to each associated gage trimmer. Methods of use and a method of rotary bit design are also disclosed.
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