METHOD TO DETECT DRILLING DYSFUNCTIONS

摘要

Methods and systems for detecting downhole bit dysfunction in a drill bit penetrating a subterranean formation comprising receiving a plurality of drilling parameters characterizing a wellbore drilling operation and calculating bit aggressiveness (µ) at each of a plurality of points during drilling, wherein each point corresponds to time, depth, or both. A depth-of-cut (DOC), time derivative of bit aggressiveness (µ?), calculated as dµ/dt, or both, is calculated at each of the plurality of points. A two-dimensional data representation of the plurality of points, comprising µ in one dimension and DOC, µ?, or both, in another dimension is created. Data features are extracted from the two-dimensional data representation and downhole bit dysfunction is identified by comparing the extracted data features with predefined criteria.