| 摘要 |
A hydraulic strain sensor (16) for use with a downhole tool on a slickline, wireline, coiled tubing or drill string pipe type of conveyance device includes a housing having two chambers (38, 40) with a pressure differential between the two chambers. A mandrel (30), piston (34) and cylinder (26) is disposed in the housing, such mandrel being adapted for coupling to the tool so that the weight of the tool is supported by the pressure differential between the two chambers. A pressure-responsive sensor (54) in communication with one of the sealed chambers is provided to sense pressure changes in the chamber as the tool is accelerated or decelerated downhole along a borehole or wellbore and to generate signals representative of the pressure changes occuring in the chambers.
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