The purpose of a well casing is to line the drilled borehole of a water or oil well with a durable, heavy-duty steel or thermoplastic pipe to ensure safe, long-term operation. Structurally, the casing prevents the surrounding unconsolidated soil, sand, and rock walls from collapsing inward and blocking the well shaft. Environmentally, it acts as an impermeable barrier that shields underground freshwater aquifers from being contaminated by surface pollutants, agricultural runoff, or lower-quality brackish water layers. Additionally, the casing houses submersible pumps and drop pipes, while its lower perforated sections serve as a secure intake filter that allows clean groundwater to flow freely into the well while blocking loose sediment and rock debris.
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