Borehole Size Monitoring
Measurements of borehole diameter are made using acoustic pulse-echo sensors. The sensors measure the transit time of acoustic waves between the sensor and the borehole wall and transmit the results to the surface in real time. The surface computer system uses this information to derive the corresponding stand-off distance and borehole diameter, based on the calculated acoustic velocity of the borehole fluid under downhole conditions. The acoustic sensors also record detailed data in memory, which is processed after the run to derive measures of borehole shape, ellipticity and ellipse orientation.
