WELL SCREEN FOR NON-VERTICAL WELL SYSTEMS
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United States of America Patent
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May 9, 2016
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May 7, 2015
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Abstract
Systems and methods for supplying water to a desalination plant from a subsurface feedwater supply using one or more slant or horizontally directionally drilled (“HDD”) wells. In particular embodiments, an angled well screen pipe is perforated only in a lower portion of its perimeter, allowing some filter pack material to remain above the perforations (in the annular space between the top of the perforations and the borehole wall) and act as a reservoir. This partial perforation or “half-moon” pattern allows for some vertical settlement of the filter pack over time but still provides a reservoir to avoid the situation of the well screen directly contacting the aquifer. The filter pack can be placed using a system of tremie pipes or can be pre-packed prior to insertion inside temporary casings.
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