Packing-seal for boreholes

Details Packing-seal for boreholes Packing-seal for boreholes

E - Fixed Constructions

21

B

166/65

E21B 33/127 (2006.01) E21B 33/12 (2006.01)

Patent

CA 1291947

PACKING-SEAL ASSEMBLY Abstract of the Disclosure The packing-seal is shown in use in a borehole as a level-isolating seal for a groundwater sampler. The packing-seal shown includes an expandable annulus (63) of Dowell (TM) water-expandable material. Surrounding that is a pressure-sleeve (61) of rubber. A sheet (64) of woven Kevlar (TM) is wrapped circumferentially around the sleeve and the Dowell annulus, such that the ends (67,68) of the Kevlar sheet overlap. Outside the Kevlar is an outer rubber sleeve (69). Upon expansion of the packing seal to fill the borehole, the Kevlar sheet unwraps to allow the Dowell to expand without restraint. Once the packing seal has filled the borehole, the Kevlar sheet is prevented from unwrapping further. If the borehole contains a fissure (71) the Kevlar provides a rigid bridge over the fissure, and prevents the packing-seal from ballooning out into the fissure.

551427

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