Method and device for improving the coefficient of transmission

Details Method and device for improving the coefficient of transmission Method and device for improving the coefficient of transmission

1989-10-12

1990-10-02

Steinberger, Brian S.

Acoustics

Geophysical or subsurface exploration

Well logging

367912, 181401, 166212, G01V 140

Patent

active

049601814

ABSTRACT:
A method is provided for improving the coefficient of transmission to geological formations of the energy generated by the firing of a seismic source lowered inside a well or borehole and a device for implementing same. A zone of the wall containing the seismic source is defined by confinement so as to prevent the propagation along the well, outside the confined zone, of the energy generated therein by the seismic source, when fired. The confinement is achieved by closing off the wall on each side of the seismic source. Two expandable members are used disposed in the wall on each side of the source and each comprising for example an elastomer sheath, an annular piston whose movement causes expansion of the sheath and hydraulic means for moving the piston.

REFERENCES:
patent: 4722417 (1988-02-01), Selsam
patent: 4770268 (1988-09-01), Magneville
patent: 4773501 (1988-09-01), Dedole et al.
patent: 4817755 (1989-04-01), Gildas
patent: 4858718 (1989-08-01), Chelminski

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