Crawler drill works by pump suction reverse circulation type, under the effect of atmospheric pressure, liquid circulation by sedimentation tank through the ditch along well annular gap back to the bottom, drive the rotation of the drill bit for drilling, the negative pressure created by the pump suction you chips into the pipe cavity, precipitation of liquid circulation continued to flow into the wellhead.

Crawler drill is very convenient in operation and maintenance, long service life of parts and production costs are relatively low.