Acoustics – Geophysical or subsurface exploration – Seismic wave detection
Patent
1993-10-19
1994-04-12
Lobo, Ian J.
Acoustics
Geophysical or subsurface exploration
Seismic wave detection
181401, 181104, G01V 140
Patent
active
053027825
ABSTRACT:
A seismic detector for boreholes is described that has an accelerometer sensor block for sensing vibrations in geologic formations of the earth. The density of the seismic detector is approximately matched to the density of the formations in which the detector is utilized. A simple compass is used to orient the seismic detector. A large surface area shoe having a radius approximately equal to the radius of the borehole in which the seismic detector is located may be pushed against the side of the borehole by actuating cylinders contained in the seismic detector. Hydraulic drive of the cylinders is provided external to the detector. By using the large surface area wall-locking shoe, force holding the seismic detector in place is distributed over a larger area of the borehole wall thereby eliminating concentrated stresses. Borehole wall-locking forces up to ten times the weight of the seismic detector can be applied thereby ensuring maximum detection frequency response up to 2,000 hertz using accelerometer sensors in a triaxial array within the seismic detector.
REFERENCES:
patent: 3614891 (1969-03-01), Nolte
patent: 4534020 (1985-08-01), O'Brien
patent: 4702343 (1987-10-01), Paulsson
patent: 4715470 (1987-12-01), Paulsson
patent: 4845990 (1989-07-01), Kitzinger et al.
patent: 4923030 (1990-05-01), Meynier
patent: 5027918 (1991-07-01), Cole
patent: 5060751 (1991-10-01), Kuhlman et al.
Lobo Ian J.
Southwest Research Institute
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