Cased kelly drilling wani aikin gine-ginen kasa ne wanda aka yi musamman don burodi na diamita babba inda tsauri da inganci sune muhimman abubuwa don nasarar aikin. Wannan fasaha ta amfani da kelly bar - wata dandamali mai ƙarfi wacce ke watsa ƙarfin juyawa da ƙarfin juyawa - tare da external steel casing don riƙe tsarin burodi ta hanyar yanayin kasa mara tabbas ko duwatsu masu ɓacewa. Casing na aiki a matsayin tsarin goyon bayan wanda ke hana burodi ya ruguje, kuma yana ƙarƙashin ruwa, sannan kuma yana ba da damar ci gaba da aikin gina ta hanyar yanayin kasa mai wahala. Kelly bar na aiki tare da casing don ƙirƙirar wani tsarin tono mai tsari, wanda ya sa wannan aikin ya zama mai tasiri musamman don binciken ilimin ƙasa mai siffar siffa da kafa tsarin kasa a cikin yanayin kasa mara tabbas.
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