Reversible rigid coupling apparatus and method for borehole seis

Details Reversible rigid coupling apparatus and method for borehole seis Reversible rigid coupling apparatus and method for borehole seis

1991-06-14

1992-01-14

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Seismic wave detection

181401, 367178, 367188, G01V 116

Patent

active

050801902

ABSTRACT:
An apparatus and method of high resolution reverse vertical seismic profile (VSP) measurements is shown. By encapsulating the seismic detector and heaters in a meltable substance (such as wax), the seismic detector can be removably secured in a borehole in a manner capable of measuring high resolution signals in the 100 to 1000 hertz range and higher. The meltable substance is selected to match the overall density of the detector package with the underground formation, yet still have relatively low melting point and rigid enough to transmit vibrations to accelerometers in the seismic detector. To minimize voids in the meltable substance upon solidification, the meltable substance is selected for minimum shrinkage, yet still having the other desirable characteristics. Heaters are arranged in the meltable substance in such a manner to allow the lowermost portion of the meltable substance to cool and solidify first. Solidification continues upwards from bottom-to-top until the top of the meltable substance is solidified and the seismic detector is ready for use. To remove, the heaters melt the meltable substance and the detector package is pulled from the borehole.

REFERENCES:
patent: 2477172 (1949-07-01), Brownlow
patent: 3963093 (1976-06-01), Morris
patent: 4292590 (1981-09-01), Wilson
patent: 4534020 (1985-08-01), O'Brien
patent: 4879695 (1989-11-01), Meadows

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