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Title: Down hole periodic seismic generator

A down hole 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.
Authors:
 [1] ;  [2] ;  [1]
  1. (Albuquerque, NM)
  2. (Las Cruces, NM)
Publication Date:
OSTI Identifier:
866847
Report Number(s):
US 4805727
DOE Contract Number:
AC04-76
Resource Type:
Patent
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
periodic; seismic; generator; periodic; seismic; generator; transmitting; variable; frequency; predominantly; shear-wave; vibration; earth; strata; surrounding; borehole; comprises; unitary; housing; operably; connected; head; support; electrical; cabling; contains; clamping; apparatus; selectively; clamping; housing; walls; borehole; comprises; variable; speed; pneumatic; oscillator; self-contained; pneumatic; reservoir; producing; frequency-swept; seismic; output; discrete; frequency; range; seismic generator; seismic generator; unitary housing; variable frequency; frequency range; operably connected; variable speed; selectively clamping; strata surrounding; clamping apparatus; periodic seismic; periodic seismic; shear-wave vibration; contains clamping; earth strata; discrete frequency; electrical cabling; housing operably; transmitting variable; predominantly shear-wave /181/