Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1978-10-25
1981-02-24
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181120, 181401, 367142, 175 1, G01V 114, G01V 140
Patent
active
042522102
ABSTRACT:
In generating seismic waves in earth a generator having a generally elongate, tubular expandable and contractible outer wall portion closed at its upper and lower ends by rigid strength members having separate input and return pressure lines is placed in a well bore, a hydraulic coupling pressure is applied through the input line which causes the expandable wall portion to engage and remain coupled with and in direct contact with the earth wall in the well bore and hydraulic pressure impulses are then cycled through the input and return lines at pressures greater than the coupling pressure to cause further expansion of the expandable wall portion, thereby generating and radiating seismic waves in the earth upon application of each impulse while maintaining the hydraulic coupling pressure sufficient to effectively maintain the outer wall anchored to the wall of the bore hole. The coupling pressure should be sufficient to anchor and couple the transducer to the well bore without any additional anchoring. The pressure impulses should be sufficiently higher than the coupling pressure to create motion in the earth within the earth's elastic range. In marsh or marine waters, the coupling pressure is omitted and the generator is placed in the water above the earth.
REFERENCES:
patent: 2281751 (1942-05-01), Cloud
patent: 2424108 (1947-07-01), Merten
patent: 3221833 (1965-12-01), Malmberg
patent: 3282371 (1966-11-01), Miller
patent: 3346066 (1967-10-01), Miller et al.
patent: 3718205 (1973-02-01), Fair et al.
patent: 4042063 (1977-08-01), Waters
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