Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1991-01-02
1992-09-01
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 31, 181106, 175 40, G01V 140, H04L 318
Patent
active
051445913
ABSTRACT:
A method for detecting the presences of fractures in a subsurface formation being penetrated by a drill bit during drilling. Teeth on the drill bit act as individual seismic sources, generating both shear wave energy and compressional wave energy. As the drill bit passes through a formation, the shear wave energy generated by the bit propagates along the formation in a waveguide mode between the adjacent formations. As the shear wave signal passes through a fractured zone of the formation, two shear wave signals are generated, each polarized in relationship to the orientation of the fractures in the formation. As the polarized signals propagate along the formation, secondary shear wave signals are generated which return to the surface and are detected by appropriate sensors. The sensors have a plurality of detectors in order to detect the polarity or direction of particle motion cuased by the polarized wave, providing information that a fracture zone exists in the subsurface.
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Moskowitz Nelson
Thigpen E. Eugene
Western Atlas International Inc.
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