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Bentonite seals are used above the PrePak screen to ensure placement of a water tight seal without replying on pouring or pumping sealing materials down the small space between the casing and borehole. The sleeve seal consists of granular bentonite clay pre-packaged around a short, flush-threaded casing section.
The section is installed above the screen in the casing string. When lowered into position, the bentonite hydrates and swells to form a water tight seal between the casing and the borehole.