DRILCORP DRILLING SERVICES - Borehole Drilling
2021-6-22 · Reverse circulation is a drilling technique used to drill large diameter boreholes. In order to achieve the necessary uphole velocity of the flushing medium to carry drill cuttings out of the borehole, the circulation system is reversed and the flushing medium flows down the borehole between the borehole wall and the drill string.
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