ISSN: 1945-7545
CODEN: GTJODJ
Published Online: 4 October 2011
Page Count: 4

A Small, Lightweight Borehole Receiver for Crosshole and Downhole Seismic Testing

Kalinski, M. E.
Hardin-Drnevich-Huang Professor, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY

(Received 21 June 2011; accepted 30 August 2011)

Abstract

Crosshole and downhole seismic testing have traditionally employed the use of a downhole receiver consisting of geophones in a sealed container along with a separate inflatable bladder for seating the geophones against the inside of the boring. This configuration has been used with success, but these receivers can be relatively large and heavy. As an alternative, a smaller, lighter borehole receiver design has been developed. The prototype tool is approximately 19 cm (7.5 in.) long and 6.4 cm (2.5 in.) in diameter, and it weighs less than 0.68 kg (1.5 lb). The new design is a single pressuremeter-like unit in which small accelerometers are glued to the inside of an inflatable membrane. When inflated, the accelerometers are pressed against the borehole wall or casing, and excellent coupling is achieved. Typical results from field testing indicate that the new tool produces reliable results.

Keywords:
crosshole seismic, downhole seismic, shear wave velocity, accelerometer, borehole logging

Paper ID: GTJ104156
DOI: 10.1520/GTJ104156
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