Reverse circulation (RC) drilling

Reverse circulation (RC) drilling

 

Schematic of the reverse circulation drilling system with the bit. 1, Bit; 2, dual‐wall drill pipe; 3, annular gap; 4, central channel; 5, drill support; 6, rotary disc; 7, flexible air input tube; 8, double‐passage swivel; 9, flexible discharging tube; 10, gooseneck tube.

Air reverse circulation bit. 1, Bit body; 2, pressure‐restoring groove; 3, flushing nozzle; 4, annular gap of the double‐wall drill pipe; 5, suction nozzle; 6, central channel; 7, borehole wall.


 

Computation models of the bit. (A) Overall structural and (B) local structural without an annular slit.
 

Computational grids for the reverse circulation bit.

Velocity contours of the reverse circulation (RC) drill bit for different grids. (A) The RC drill bit of Type I and (B) the RC drill bit of Type II, and (C) the RC drill bit of Type III.

Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence model and simulation method applied during the RC drilling process is analyzed, and an annular...

Velocity contours of the reverse circulation (RC) drill bit for different grids. (A) The RC drill bit of Type I and (B) the RC drill bit of Type II, and (C) the RC drill bit of Type III.

Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence model and simulation method applied during the RC drilling process is analyzed, and an annular...

Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence model and simulation method applied during the RC drilling process is analyzed, and an annular...