Method and apparatus for seismic signal acquisition in a...

Details Method and apparatus for seismic signal acquisition in a... Method and apparatus for seismic signal acquisition in a...

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

Patent

CA 1200003

METHOD AND APPARATUS FOR ACQUIRING SEISMIC SIGNALS IN A BOREHOLE Invention of Jean-Luc Decorps and Alain Delpuech Abstract of the Disclosure The present invention relates to the acquisition of seismic signals at different levels in a borehole, in response to the generation of seismic waves by a source placed on the surface or in the vicinity of the surface. The acquisition is carried out by means of a sonde suspended in the borehole from a cable and equipped with an anchoring pad. At each acquisition level, the pad is anchored in the borehole wall to couple the sonde to the formation, and then the pad is released from the wall once the acquisition is over. The signals acquired are then sent to the surface by means of the cable. The force with which the pad is anchored in the wall is controlled by means of a feedback arrangement which includes a sensor arranged in the pad itself. During the sonde movements from one level to another, the pad is kept in contact with the wall.

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