Patent ID: 8928488
Filing Date: 2015-01-06
Classification: E21B,G01V

Abstract:
1. A method, comprising: monitoring a first condition of a first selected interval of a drill string located down hole, the first condition associated with one of a signal propagation in a formation, a signal propagation on the drill string, or a signal propagation both in the formation and on the drill string, and associated with a stress monitored by a first strain sensor in the first selected interval monitoring a second condition of a second selected interval of the drill string, the second condition associated with the signal propagation associated with the first condition and associated with a stress monitored by a second strain sensor in the second selected interval comparing the first condition to the second condition to provide a comparison result; and based on the comparison result, selecting one of the first selected interval or the second selected interval to propagate one of a signal in the formation, a signal on the drill string, or a signal in both the formation and on the drill string.