Well Screen

KOREA SLOT 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, and prevents sediment from entering the well, and serves structurally to support the aquifer material.

Continuous-slot well screens provide more intake area per unit area of screen surface than any other types of screen. This type of screen has maximum open area. For best well efficiency, the percentage of open area in a screen should be the same as, or great than, the average porosity of the aquifer material. Water flows more freely through a screen with a large intake area compare to one with limited open area. The entrance velocity is low, therefore head loss for the screen is at a minimum and finally minimizes drawdown in the well.

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Reference :
① Horizontal-Radial Water Collecting Well.
② Riverbed Filtration System.

Reference : ①. Radial Collector Well

Radial collector wells are wells whose screens have a radial or horizontal component. Types of radial wells include collector wells, horizontally directionally drilled wells, and slant or horizontal wells. Collector wells are the most common type of radial wells. The basic components of collector well design are a vertical shaft with horizontal screen laterals. These laterals typically extend up to tens of hundreds of meters and vary in number based on aquifer characteristics.

Radial collector wells take advantage of natural filtration through aquifer materials, which reduces treatment costs. Maintenance is reduced as the longer horizontal screens reduce water velocity, thereby reducing well head losses and clogging. Furthermore, lateral well screens are able to exploit the maximum saturated thickness of shallow aquifers. For example, up to 500 m of horizontal well screen can be developed in formations that would accommodate only 20 m of vertical well screen. Horizontal directionally drilled (HDD) wells, which are widely used in the oil and gas industry, are now being developed for groundwater applications.

Radial collector wells are used in applications such as municipal production wells, dewatering operations, desalination plant intake systems, and inducing surface water infiltration for groundwater recharge.

Transcribe a passage of Radial Wells, Dennis E. Williams
Copyright © 2005 by John Wiley & Sons, Inc.

Reference : ②. Riverbed Filtration System.

The riverbed filtration process extracts water from the vertical well from the river shoreline. The vertical well connects with horizontal (lateral) screen pipes that are the intake screens for filtrated river water through the riverbed aquifer layer. This process secures an indirect water intake source and helps to improve river water quality as well as to insure river water is maintenance.

The seawater intake system indirectly intakes seawater that is naturally filtrated through the sand layer of the sea. Benefits of Riverbed Filtration are:

1. Utilizes the natural filtration of the riverbed aquifer
2. Removes nutrient salts & pollution substances
3. Reduced facility investment costs
4. Reduced maintenance costs
5. Use of chemicals not required
6. No sludge generated