Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes

Figure 1

Reverse circulation drilling with DTH. 1: drill bit; 2: splined sleeve; 3: DTH; 4: inner drill pipe; 5: outer drill pipe; 6: swivel with double channels; 7: drill tower; 8: cyclone separator; 9: air hose; 10: air booster; 11: air compressor.