Drill rod having internally projecting portions
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United States of America Patent
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Apr 3, 2018
Issued Date -
N/A
app pub date -
Jul 17, 2015
filing date -
Jul 18, 2014
priority date (Note) -
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Abstract
A threaded drill string component having a hollow elongate body with a box end portion, an opposing pin end portion and a cylindrical mid-body portion that extends longitudinally between the respective box and pin end portions and has a variable wall diameter. The mid-body inner wall of the mid-body portion has at least one projecting portion or upset that is spaced from both the box and pin end portions and extends inwardly toward a central longitudinal axis of the hollow body and a plurality of troughs defined in the mid-body inner wall of the mid-body portion.
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