Casing string

In drilling technology, casing string is a long section of connected oilfield pipes that is lowered into an wellbore and cemented in place. The purpose of the casing pipe is to:Prevent the borehole from collapsing. Prevent formation fluids from entering the borehole in an uncontrolled way.

Prevent fluids in the borehole from entering other formations.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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