Downhole Seismic Sensor with Filler Fluid and Method of Using Same

摘要

A seismic sesor for a downhole tool positionable in a wellbore penetrating a subterranean formation. The seismic sensor includes a sensor housing, a bobbin supported in the sensor housing along an axis thereof, at least one coil wound about the bobbin (the coil movably supportable within the sensor housing by at least one spring), at least one magnet positionable about the bobbin to generate a magnetic field with the at least one coil whereby seismic vibrations are detectable, and a filler fluid disposed in the sensor housing to buoy the at least one coil whereby gravitational effects may be neutralized.

主权项

1. A seismic sensor for a downhole tool positionable in a wellbore penetrating a subterranean formation, the seismic sensor comprising:
a sensor housing; a bobbin movably supported in the sensor housing by at least one spring; at least one magnet fixedly positionable in the sensor housing to generate a magnetic field therein; at least one coil wound about the bobbin and movable therewith relative to the at least one magnet whereby seismic vibrations are detectable; and a filler fluid disposed in the sensor housing to buoy the at least one coil whereby displacement of the at least one coil may be reduced.