What is the purpose of Pump casing?
Prevents the pollution of water from the borehole. Prevents unbalanced upper formations from caving in and sticking the drill string. Provides a strong upper foundation to allow the use of high-density drilling fluid to continue drilling deeper.
The most common materials for well casing are carbon steel, plastic (most commonly, but not exclusively, PVC), and stainless steel. Different geologic formations and groundwater quality dictate what type of casing can be used.
What is the function of the casing?
Without it casing, then the borehole walls can collapse or become unstable due to hydrostatic pressure from the surrounding soil and rocks. So,casing functions like a strong spine to provide the structural support necessary to keep the borehole walls upright, non-collapsing, and safe for workers.
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