Which component allows water to enter the well while providing filtration?

Which component allows water to enter the well while providing filtration?

• A. Well screen
• B. Gravel pack
• C. Casing
• D. Well vent

Answer: (A)

The well screen is the intake element that also filters. It’s a perforated or slotted section of the casing (or a separate screen pipe) placed at the water‑bearing interval. The openings are small enough to block sand and larger particles, so water from the surrounding formation can flow through while solids are kept out. When a gravel pack surrounds the screen, it adds a filtering support layer and helps prevent fine material from entering while still letting water pass into the screen. The casing simply outlines and protects the borehole, and a well vent is used to relieve pressure or vent gases, not to filter water as it enters the well.

The well screen is the intake element that also filters. It’s a perforated or slotted section of the casing (or a separate screen pipe) placed at the water‑bearing interval. The openings are small enough to block sand and larger particles, so water from the surrounding formation can flow through while solids are kept out. When a gravel pack surrounds the screen, it adds a filtering support layer and helps prevent fine material from entering while still letting water pass into the screen. The casing simply outlines and protects the borehole, and a well vent is used to relieve pressure or vent gases, not to filter water as it enters the well.