A well screen is a filter that allows water to enter the pipe from several entry points. The filter can be made from a number of materials. The filter needs to have a large surface area through which water can penetrate. It needs to have non-clogging slots to keep water flowing. It must resist corrosion because it will be in contact with water. It needs to have enough strength to keep the surrounding structure intact.
Well screen designs should incorporate the following features:
1Minimum entrance velocity.
2Maximum open area of screen.
3Correct design of slots to minimize blockages.
4Slot size should match aquifer or gravel pack medium.
5Screen material should be corrosion resistant.
6Screen should allow for periodic maintenance.
Installing a well screen is recommended for all environmental drilling jobs. It helps to prolong the life of the well and keeps the water flowing without restriction.
Unconsolidated materials, like sand and fine silt, can flow with water without any issues. These fine particulates must be filtered out before the water becomes usable. A well screen helps to keep most of this fine material out of your well water. This lessens the need for filtering the water and keeps the water flowing.
Adding a gravel pack around the well screen helps filtrate the water even more than the well screen alone. The gravel pack provides another layer of filtering around the screen. It also provides a structural element that helps keep surrounding materials in place.
1. collapse strength equal to pipe;
2. double the tensile strength of standard rod based screen;
3. a bioresistant, hydraulically superior (to silica sand) pack;
4. a greater percentage of open area(for deep applications) than that of a conventional screen, due to the dual support construction
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Features 1. Screens with high open area are more suitable for the construction of high-quality water wells, oil wells and gas wells.
2. Low cost operation Screens with high open area shall favor groundwater infiltration. Abundant water shall reduce the water level’s down, thus to save energy consumption.
3. Reduce the abrasion of the pump
Under the same condition, high open area can make the speed of groundwater’s entering into the screen much slower than any other filtration apparatus, which will avoid sand’s entering into screen because of high pressure, thus reduce the abrasion of the pump.
4. Extend the life span of wells
Comparatively, groundwater’s entering into screen with higher open area is much easier than the entering into lower open area screen. The slow water flow shall extend the life span of wells.