Measuring device for a seismic profile within a well- bore

G - Physics – 01 – V

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G01V 1/40 (2006.01) E21B 23/00 (2006.01) E21B 23/01 (2006.01) E21B 47/01 (2006.01) G01V 1/16 (2006.01) G01V 11/00 (2006.01)

Patent

CA 1216924

ABSTRACT OF THE DISCLOSURE A measuring device for a seismic profile within a well-bore comprises resilient members such as springs which are flexible in at least two directions and are interposed between a geophone and a rigid arm connected to a measuring-tool body for applying the geo- phone against the wall of the well-bore during each detection of seismic waves generated at the ground surface. The elasticity of the resilient members is at least equal to the lowest degree of elasticity of the subsurface stratum through which the well-bore extends. The resonance frequency of the mass of the geophone with the resilient members is equal at a maximum to the resonance frequency of the geophone mass with said lowest degree of elasticity.

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