Friction type drill pipe: The external key of each section of the drill pipe is a complete linear plate structure over the entire length of the drill pipe. The axial pressure during the drilling process is the frictional resistance generated by the circumferential positive pressure transmitted between the inner and outer keys of each section of the drill rod by the rotation of the power head, which is converted into the axial pressure to achieve pressurized feed. The role of.
Friction type drill pipes are generally used for drilling in softer formations. They can be drilled into silt layer, soil, (mud) sand layer, and pebble (floating) rock layer, and they can be made into 4, 5, and 6 sections in one strand. The drilling depth can reach about 130 meters.
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