Outer Casing Strings

Outer casing strings na essential components for double rotary drilling systems, wey designers create to stabilize boreholes while penetrating challenging subsurface conditions for deep foundation construction and geotechnical engineering. These specialized drilling tubes form outer rotating column of double rotary rig configuration, wey work with inner drilling assembly to achieve precise borehole advancement. Outer casing string serve mainly to maintain borehole stability, especially for unstable ground formations where single-rotation drilling methods no dey adequate for safe, effective construction of deep foundations like bored piles, caissons, and deep shaft installations.