Borehole packers

Details Borehole packers Borehole packers

E - Fixed Constructions

21

B

166/64

E21B 33/128 (2006.01)

Patent

CA 1232836

A B S T R A C T A packer for isolating sections of boreholes, to facilitate multilevel groundwater monitoring in a single borehole, is disclosed. The packer includes a water- expandable substance installed in sleeve-like fashion around a casing in the borehole, and covered by an expandable membrane. Holes are provided in the casing behind the water- expandable substance, so that when the casing is filled with water, water flows to the substance, the substance expands, and the membrane is pressed against the borehole wall, thereby effecting a seal to isolate the desired section. The use of a number of packers within a borehole, either singly or in pairs, is contemplated. Instead of being installed directly around the casing, the packers may be conveniently installed around lengths of pipe which are subsequently spliced in with lengths of the casing pipe. The preferred water-expandable substance is a sealant proprietary to the Dow Chemical Company and sold by them under their trade mark DOWELL, but bentonite clay or other suitable water- expandable substances are also contemplated.

447390

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