Abstract
ABSTRACT An acoustic logging system which uses circumferentially propagated acoustic waves for measuring several parameters in a borehole has been designed and tested. The detection of one type of wave whose particle motion is perpendicular to the borehole wall is used to indicate the presence of vertical or near-vertically oriented fractures in fluid-filled boreholes. This paper reviews the basic theoretical concepts and instrumentation design of the Circumferential Acoustilog® and presents laboratory data to illustrate the validity and applications of the measured parameters. Recent improvements over previous devices of this type will be discussed. One of the improvements is the incorporation of a direct fluid wave baffle which extends the range of formation velocities that can be accurately measured, and also provides the means for identifying the guided fluid wave. A recent significant improvement to the system is the addition of an orientation section which assists in determining the direction of fracture systems. Field examples from the United States, Canada, and Europe demonstrate the application of the system in varying lithologies and borehole conditions.
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