Casing tubes are auxiliary elements usually necessary for the proper execution of a drilling.
Its use is essential when the soil is unstable or when there are mud losses during the drilling.
It is very important to note that casing tubes are not suitable for drilling. Their mission is to keep the walls of the hole.
The diameters of the casings fit the overall drilling telescopic system
In the bottom of the drill string, a casing shoe or a casing bit is placed
In cases where drilling has been very clean and do not need to lower the casing using rotation, the casing shoe may be sharp bezel type. When it is necessary to lower the casing string using rotation, the casing shoe/ bit must be type T.C. or diamond.