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Title: Three-component borehole wall-locking seismic detector

Abstract

A seismic detector for boreholes is described that has an accelerometer sensor block for sensing vibrations in geologic formations of the earth. The density of the seismic detector is approximately matched to the density of the formations in which the detector is utilized. A simple compass is used to orient the seismic detector. A large surface area shoe having a radius approximately equal to the radius of the borehole in which the seismic detector is located may be pushed against the side of the borehole by actuating cylinders contained in the seismic detector. Hydraulic drive of the cylinders is provided external to the detector. By using the large surface area wall-locking shoe, force holding the seismic detector in place is distributed over a larger area of the borehole wall thereby eliminating concentrated stresses. Borehole wall-locking forces up to ten times the weight of the seismic detector can be applied thereby ensuring maximum detection frequency response up to 2,000 hertz using accelerometer sensors in a triaxial array within the seismic detector.

Inventors:
 [1]
  1. (Helotes, TX)
Issue Date:
Research Org.:
SOUTHWEST RESEARCH INSTITUTE
OSTI Identifier:
869235
Patent Number(s):
5302782
Assignee:
Southwest Research Institute (San Antonio, TX) OSTI
DOE Contract Number:  
AC22-89BC14473
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
three-component; borehole; wall-locking; seismic; detector; boreholes; described; accelerometer; sensor; block; sensing; vibrations; geologic; formations; earth; density; approximately; matched; utilized; simple; compass; orient; surface; shoe; radius; equal; located; pushed; actuating; cylinders; contained; hydraulic; drive; provided; external; force; holding; distributed; larger; wall; eliminating; concentrated; stresses; forces; times; weight; applied; ensuring; maximum; detection; frequency; response; 000; hertz; sensors; triaxial; array; sensor block; hydraulic drive; approximately equal; seismic detector; borehole wall; sensing vibrations; frequency response; geologic formations; axial array; /181/

Citation Formats

Owen, Thomas E. Three-component borehole wall-locking seismic detector. United States: N. p., 1994. Web.
Owen, Thomas E. Three-component borehole wall-locking seismic detector. United States.
Owen, Thomas E. Sat . "Three-component borehole wall-locking seismic detector". United States. https://www.osti.gov/servlets/purl/869235.
@article{osti_869235,
title = {Three-component borehole wall-locking seismic detector},
author = {Owen, Thomas E.},
abstractNote = {A seismic detector for boreholes is described that has an accelerometer sensor block for sensing vibrations in geologic formations of the earth. The density of the seismic detector is approximately matched to the density of the formations in which the detector is utilized. A simple compass is used to orient the seismic detector. A large surface area shoe having a radius approximately equal to the radius of the borehole in which the seismic detector is located may be pushed against the side of the borehole by actuating cylinders contained in the seismic detector. Hydraulic drive of the cylinders is provided external to the detector. By using the large surface area wall-locking shoe, force holding the seismic detector in place is distributed over a larger area of the borehole wall thereby eliminating concentrated stresses. Borehole wall-locking forces up to ten times the weight of the seismic detector can be applied thereby ensuring maximum detection frequency response up to 2,000 hertz using accelerometer sensors in a triaxial array within the seismic detector.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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