Patents Assigned to Richard G. Hills
  • Patent number: 5031717
    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