Machine-locked drill pipe: The external key of each section of the drill pipe is not a complete straight plate structure in the direction of the entire length of the drill pipe, but has three to four pressure points. This type of drill pipe can transmit greater axial force. Therefore, drilling can be completed under harder geological conditions.
The machine-locked drill pipe can be drilled into the silt layer, soil, (mud) sand layer, pebble (boulder) layer and strongly weathered rock layer, and is generally made into 2 sections, 3 sections, 4 sections, and 5 sections. The drilling depth can reach about 90 meters.
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