Dual rod directional drilling system
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United States of America Patent
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Nov 7, 2023
Grant Date -
Jun 24, 2021
app pub date -
Mar 9, 2021
filing date -
May 1, 2017
priority date (Note) -
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Abstract
A flow collar for use on a dual rod drill rod assembly includes an uphole end defined in part by a first interior portion having a first interior diameter and a downhole end defined in part by a second interior portion having a second interior diameter that is larger than the first interior diameter. The flow collar further includes a plurality of radially-extending peripheral fluid passages extending through the flow collar to the second interior portion. An outer rod interfacing surface defines a continuous annular surface with a constant outer diameter.
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