Kwihlabathi lokukhutshwa kwepetroleum, itekhnoloji yokubhola iyaqhubeka ukuguquka ukuhlangabezana neemfuno ezintsonkothileyo zecandelo lamandla yanamhlanje. Elinye icandelo elibalulekileyo le itekhnoloji yi-PDC (iPolycrystalline Diamond Compact) yokubhola. Yenzelwe izicelo ezithile, ezi bits zidlala indima ebalulekileyo ekuphuculeni ukusebenza kokubhola, ngakumbi kwiimeko zokucela umngeni. Hayi