Decoupled borehole sensor

Details Decoupled borehole sensor Decoupled borehole sensor

1991-01-10

1991-09-03

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Well logging

181401, 367911, 175 50, G01V 140, E21B 418

Patent

active

050444611

ABSTRACT:
A sensor module having tri-axial spatial sensitivity is mounted in a closed compartment of an acoustic logging tool. The sensor module is resiliently mounted with three degrees of freedom with respect to the body of the tool. The compartment includes a volume of damping fluid to suppress parasitic vibrations transmitted to the sensor module from the tool body. In the inactive condition, a contact shoe, associated with the sensor module, projects through a window in the closed compartment. In the operating configuration, the sensor module and its contact shoe are caused to retract into the compartment against a compressive force when the logging tool is pressed against the wall of a borehole.

REFERENCES:
patent: 2191121 (1940-02-01), Slichter
patent: 2943694 (1960-07-01), Goodman
patent: 3363719 (1968-01-01), Venghiattis
patent: 3564914 (1971-02-01), Desai et al.
patent: 4578785 (1986-03-01), Gelfand
patent: 4670862 (1987-06-01), Staron et al.
patent: 4686653 (1987-07-01), Staron et al.
patent: 4811814 (1989-03-01), Staron et al.
patent: 4852069 (1989-07-01), Clerke et al.
patent: 4874060 (1989-10-01), Guerendel et al.
patent: 4987969 (1991-01-01), Boyle et al.
Combinable Seismic Images, Sales Brochure, Schlumberger Well Sevices, 4/90.

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