Steel Solutions in Borehole Drilling
A drill casing, also known as a setting pipe, is a large diameter steel pipe that is assembled and inserted into a recently drilled section of a borehole to protect and support the well stream.
It is similar to the bones of a spine protecting the spinal cord, casing is set inside the drilled borehole to protect and support the well stream.
The purpose of the casing in borehole drilling is to:
✔ Prevent Buckling of casing in deeper boreholes
✔ Prevent contamination of fresh water well zones.
✔ Prevent unstable upper formations from caving-in and sticking the drill string or forming large caverns.
✔ Provide a strong upper foundation to use high-density drilling fluid to continue drilling deeper.
✔ Isolate different zones (that may have different pressures or fluids known as zonal isolation) in the drilled formations from one another.
✔ Seal off high pressure zones from surface, avoiding potential for a blowout.
✔ Prevent fluid loss into or contamination of production zones.
✔ Provides a smooth internal bore for installing production equipment.