METHOD FOR POLARIZATION ACOUSTIC WELL LOGGING Russian patent published in 2008 - IPC E21B47/00 G01V1/40 

FIELD: geophysics.

SUBSTANCE: invention relates to geophysical well logging, in particular to a method of polarisation acoustic logging (PAL), and it may be used to evaluate properties of rocks. To this end electro-acoustic transducers (EAT) are used thereby for exciting and logging acoustic vibrations inside a borehole. Said vibrations are perpendicular to the borehole axis, are polarized in the planes running through the borehole axis and are propagated in the form of polarized shear waves (PSW). Moreover, the PSW are exited and logged in at least three planes running through the borehole axis. Three values of a parameter, for instance, PSW wave propagation velocity, determined in the PSW planes, are enough to build an anisotropy ellipse of this parameter. To excite PSW according to this method, monopole EAT transducers are used, having a single-directional pattern for radiation in a plane perpendicular to the instrument axis. EAT transducers that are similar to radiation sources and spaced in the PSW planes are used for logging the PSW.

EFFECT: increasing the information capacity of PAL; decreasing the complexity and cost of PAL equipment.

3 dwg