Up-hole bushing and core barrel head assembly comprising same
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United States of America Patent
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-
Dec 27, 2016
Grant Date -
Aug 1, 2013
app pub date -
Mar 14, 2013
filing date -
Oct 7, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A bushing for positioning within a core barrel assembly during an up-hole drilling operation. The bushing has a wall with an inner surface and an outer surface. The inner surface defines an inlet, an outlet, and a central bore of the bushing. The central bore surrounds a longitudinal axis of the bushing and extends between the inlet and the outlet. The outer surface has a first portion positioned proximate the inlet and a second portion positioned proximate the outlet. The first portion of the outer surface of the wall projects outwardly from the second portion of the outer surface relative to the longitudinal axis of the bushing such that the first portion of the outer surface defines opposed first and second shoulder surfaces extending substantially perpendicularly relative to the longitudinal axis. Core barrel head assemblies including such bushings are also described.
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