u drill bit above generally refers Intergral Blade Downhole Stabilizer to all pipe joints below the water column, from the core pipe, reducer fittings, take powder pipe, centralizer, drill collars, drill pipe and drill pipe and other components active.
u drill is drilling in the composition of the main members, OCTG Pup Joint a plurality of drill pipe joints are connected by means of equivalent length of the drill hole depth column.
u main task is to lift drilling rigs and casing. Height rigs should match the length of the drill stand with roots.