RCD500 Reverse circulation drilling rig

The drilling fluid (mud) of the reverse circulation drilling rig is circulated by using a mud pump from the wellhead of the well (outside the drill pipe) to the well, and then using a compressed air or mud pump to pump out from the middle of the drill pipe, so it is easier to take out slag muck. The drill slag like the egg can be discharged. Therefore, it is more suitable for the stratum in the pebbles and other relatively large particles.