Russian Journal of Earth Sciences
Vol. 5, No. 4, August 2003
Anisotropy of the rock drill core elastic properties at uniaxial
loading
A. V. Patonin
Abstract
Application of three-component recording transducers for laboratory investigations
was
restrained for a long time because of the manufacturing complexity. Ingenious three-component
piezoelectric transducers were used in this work for recording the acoustic emission
signals. At the
same time these transducers made it possible to reproduce a wave pattern which occurs
in a
sample. A real medium, in the oil-water-saturated reservoir zones especially, is
complicated and
diverse from the point of view of the lithologic composition, porosity nature, graininess
and
presence of various inclusions. Anisotropy of the core elastic properties at the
uniaxial loading
was studied in this work. A comparative analysis was made of the wave patterns, which
were
recorded by ultrasonic transducers of different types.
Results of the work may be used for a further development of the laboratory methods
for
investigation of the elastic properties of materials. The effect of a stable polarization
of the
ultrasonic wave coinciding with orientation of the weakened zone obtained, allows
to use it for
determination of the direction of the preferred orientation of the joints.