Borehole strainmeter
First Claim
1. A recoverable multiple position borehole strainmeter comprising, in combination, at least two anchors including respective sets of pistons for releasably engaging a borehole to releasably mount said anchors in said borehole in spaced-apart relationship to each other, actuation means for controllably actuating said sets of pistons to engage said borehole, said actuation means being adapted to permit each set of pistons to be independently actuable, said actuation means being controlled by control means outside said borehole, biasing means for preventing said sets of pistons from engaging said borehole when said sets of pistons are not being actuated by said actuation means, and sensing means for sensing changes in relative displacement between said two anchors whereby to monitor relative mass displacement axially along the borehole between said anchors;
- wherein said actuation means includes means for controllably supplying gas under pressure to said anchors for actuating said sets of pistons to engage said borehole.
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Accused Products
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.
30 Citations
18 Claims
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1. A recoverable multiple position borehole strainmeter comprising, in combination, at least two anchors including respective sets of pistons for releasably engaging a borehole to releasably mount said anchors in said borehole in spaced-apart relationship to each other, actuation means for controllably actuating said sets of pistons to engage said borehole, said actuation means being adapted to permit each set of pistons to be independently actuable, said actuation means being controlled by control means outside said borehole, biasing means for preventing said sets of pistons from engaging said borehole when said sets of pistons are not being actuated by said actuation means, and sensing means for sensing changes in relative displacement between said two anchors whereby to monitor relative mass displacement axially along the borehole between said anchors;
wherein said actuation means includes means for controllably supplying gas under pressure to said anchors for actuating said sets of pistons to engage said borehole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A recoverable multiple position borehole strainmeter, comprising in combination:
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a. a plurality of anchors, each of said anchors including an internal cavity, and piston means slidably mounted in said cavity for releasably engaging a borehole whereby to releasably mount said anchors in said borehole in spaced-apart relationship to each other; b. pneumatic actuation means for controllably actuating said piston means to engage said borehole, said actuation means including at least one supply of pressurized gas and a plurality of separate means for controllably, independently supplying said gas to the internal cavities of said anchors whereby to permit controllable, independent actuation of said piston means, said separate means being controlled by means outside said borehole; c. biasing means for preventing said piston means from engaging said borehole when said piston means are not being actuated by said actuation means; and d. transducer means for sensing changes in relative displacement between adjacent ones of said anchors whereby to monitor relative mass displacement axially along the borehole among said anchors. - View Dependent Claims (17, 18)
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Specification