E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
33/92
E21B 47/022 (2006.01)
Patent
CA 1279187
Abstract of the Disclosure A device positionable in a borehole for monitor- ing relative mass displacements axially along the borehole between at least two spaced-apart anchor points, comprises at least two retrievable anchor members arranged in spaced- apart opposite relationship to define the at least two anchor points, the anchor members each having radially displaceable borehole wall contacting means and including mechanical means for radially outwardly displacing the borehole wall contacting means to engage the borehole wall and thereby fix the anchor member in the borehole against the wall thereof. A linear displacement sensing means is arranged between the anchor members, the displacement sensing means being connected to one of the anchor members and including an elongated axially movable sensor element extending substantially centrally of the borehole, the sensor element being normally biased in a direction toward the other anchor member for contact engagement therewith. Relative mass displacements are transmitted to the sensor element and are measured by the displacement sensing means as a variation in distance between the anchor members within the borehole.
534872
Capelle Jean-Francois
Leroux Raoul
Theroue Gerard
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Roctest Ltee/ltd.
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