Earth boring tool
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United States of America Patent
Stats
-
N/A
Issued Date -
Oct 26, 2006
app pub date -
Apr 25, 2005
filing date -
Apr 25, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An earth boring tool includes two coaxially-aligned, positive displacement motors. One motor turns a pilot bit and the other turns a reamer concentric with the pilot bit. The central bit bores the center of the hole and the reamer enlarges it. The central bit is rotated relatively faster, while rotation of the larger diameter reamer is relatively slow. The tool can thus be used to bore larger diameter holes without slowing drilling rates or adversely affecting performance of the cutter elements due to higher tangential velocities.
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