Double rotary drilling wani aikin horarwa ne na geotechnical wanda aka tsara musamman don ƙirƙirar boreholes na diamita mai girma a cikin yanayin ƙasa mai ƙalubale. Wannan aikin horarwa na rotary ya amfani da juyin juyan juyin juya hula na inner drill string da outer casing system, wanda ke ba masu aikin horarwa damar shiga ta hanyar ƙasa da ƙasa mai ƙarfi yayin da suke kiyaye ƙarfin borehole. Tsarin juyin juyan juyin juya hula na biyu ya ba da ƙarfin ƙarfafawa na horarwa, wanda yake aikin horarwa mai dacewa don aikin gini na zurfi inda inganci da dogon aiki sune muhimman. Double rotary drilling ya fi dacewa a cikin yanayin geological mai ƙalubale, gami da dense clay layers, mixed soil-rock interfaces, da yankuna da ƙarfin ƙasa mai ƙarfi, inda ake amfani da hanyoyin horarwa na al'ada na single-head.
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