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A well screen is a filtering device that serves as the intake
portion of wells constructed in
unconsolidated or semi-consolidated aquifers. The screen
permits water to enter the well
from the saturated aquifer, prevents sediment from entering
the well, and serves
structurally to support the aquifer material. The importance
of a proper well screen cannot
be overemphasized when considering the efficiency of a well and the
log-term cost to its
owner.
Well screens are manufactured from a variety of materials and range
from crude handmade contrivances to highly efficient and long-life
models made on machines. The value
of a screen depends on how effectively it contributes to the
success of a well. Important
screen criteria and functions include:
Criteria:
1. large percentage of open area
2. non clogging slots
3. resistant to corrosion
4. sufficient column and collapse strength
Functions:
1. easily developed
2. minimal incrusting tendency
3. low head loss through the screen
4. control sand pumping in all types of aquifers
