| 摘要 |
A drill hit for drilling a borehole into an earth formation is provided. The drill bit has a central longitudinal axis and a bottom surface facing the borehole bottom during drilling with the drill bit, and comprises primary fluid injection means (10) arranged at the bottom surface and located at a selected radial distance from the central longitudinal axis, the primary flu id injection means being arranged to eject a primary stream of fluid into the borehole, the primary stream having a component in a transverse plane of the drill bit, directed from the fluid injection means to the central longitudin al axis.
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