Equipment for estimating the characteristics of stress of formations, and method to estimate the stress tensor desviatu00f3rio from directions of anisotropy of shear strength of the shaft and directions of sonic logging failure of profiling by image

摘要

Equipment for estimating the characteristics of stress of formations, and method to estimate the stress tensor desviatu00f3rio from directions of anisotropy of shear strength of the shaft and directions of sonic logging failure of profiling by image. Methods and apparatus for estimating the characteristics of stress of the formations.The method comprising: (a) the acquisition of measurement data of sonic anisotropy data, images, or both associated with at least one shaft (b) employ data from sonic anisotropy to estimate the direction of fast shear (FSA) to extract data observed in the FSA, (c) calculate The FSA modeling directly,The direct modeling using a tensor of stress of character desviatu00f3rio to extract data of the FSA provided; (d) to calculate the maladjustment of the FSA from the difference between the observed data and the data of the FSA FSA provided so as to obtain calculated maladjustment of FSA in connection with the first ' Nsor stress character desviatu00f3rio; (E) if the calculated maladjustment of the FSA is not exceeding aThe value set, then store the calculated maladjustment of FSA, otherwise, repeat steps (d) - (H) using another tensor of stress of character desviatu00f3rio such that a different stress tensor character desviatu00f3rio is used for each repetition; (f) to select the shortest disjoint Calculated stored from the group consisting of disjoint of the FSA calculated and stored.At least one calculated water stored or combination of those mentioned.