Abstract: An advanced downhole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.
Type:
Grant
Filed:
February 17, 1989
Date of Patent:
July 16, 1991
Assignee:
Richard G. Hills
Inventors:
Harry C. Hardee, Richard G. Hills, Richard P. Striker