U.S. Department of Energy


Date of this Version



Published in GEOPHYSICAL RESEARCH LETTERS, VOL. 15, NO. 5, PAGES 467-470, MAY 1988


The acoustic borehole televiewer provides excellent data for the detection and measurement of stress-induced wellbore breakouts. Analog televiewer data from the Fenton Geothermal well EE-3 in New Mexico were digitized and interactivly processed for detection and analysis of azimuth and shape of stress-induced breakouts occurring in the well at depths of about 2.9 - 3.5 km. A statistical analysis of the measured breakout azimuths yields a well resolved orientation of least horizontal principal stress of 119 °, consistent with least principal stress data from the Rio Grande Rift. As the magnitude of the least horizontal compressive stress, Shmin, in EE-3 is known from hydraulic fracturing, we present a new method in which Shmin and data on breakout width are used to estimate the magnitude of the maximum horizontal principal stress.