Abstract
Stress direction is one of the important parameters in petroleum exploration and development. Logging data can be used to calculate stress direction. Some researches of this study have carried out. To achieve the rapid qualitative identification and precise quantitative evaluation of stress direction, a new method to determine stress direction is established by three calipers based on the borehole breakout ellipse method. A wall ellipse can be fitted with three calipers. Four cases based on the length relationship between the three calipers are studied. Each case corresponds to a formula. Then the direction of long axis is got. The minimum stress direction is determined by combining the angles of the long axis of ellipse and the plate 1. This method is applied well in the real data and can fix the minimum stress direction within 30 degree quickly. It can also provide the whole interval accurate minimum stress direction and be easy to operate.
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