Measuring and testing – Borehole or drilling – Formation logging
Patent
1995-01-24
1996-12-17
Chilcot, Richard
Measuring and testing
Borehole or drilling
Formation logging
73768, 73783, 73784, 335421, 33544, 166 66, 16625001, 1662551, E21B 4700
Patent
active
055855555
ABSTRACT:
A recoverable, multiple position borehole strainmeter is provided. The strainmeter includes at least two anchors having pistons for releasably engaging the borehole whereby to mount the strainmeter in the borehole. A pneumatic actuator for controllably, independently actuating the pistons to engage the borehole is provided. A biasing mechanism prevents the pistons from engaging the borehole when the pistons are not being actuated by the actuator, and a relative displacement sensor senses changes in relative displacement between adjacent anchors whereby to monitor relative mass displacement axially along the borehole between the anchors.
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"Rod Extensometers with Packer Anchors" INTERFELS, Germany; Product No. 121 Code 9020; Date unknown; company brochure.
"Borehole Extensometer Untensioned Stainless Steel Rod MPBX", SINCO Slope Indicator Co.,; Published 1988; company brochure.
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"Rod-Type Extensometer," Model A-6; GEOKON Incorporated; company brochure, date unknown.
"Rod-Type Borehole Extensometers"; GEOKON Incorporated; company brochure, date unknown.
Chilcot Richard
Dombroske George M.
Geokon, Inc.
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