Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD)

<div>Influence of inner jet nozzles on the air flow inside the drill bit: (a) air suction effect during the simulation and experiment and (b) the distribution of injected air.</div>

Geofluids

fig9

Figure 9

Figure 9: Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD) 