Method and system for determining a distance to an anomaly in a formation in front of a device.

摘要

Method and system for determining a distance to an anomaly in a formation ahead of a device, a method and a system are provided to allow the determination of a distance of a tool to the anomaly ahead of the tool. The apparatus for performing the method includes at least one transmitter and at least one receiver.An implementation of the method includes transmitting electromagnetic signals from the at least one transmitter by the formation surrounding the borehole of a well and detect responses of tension in the at least one receptor induced by electromagnetic signals.The method includes calculating the apparent conductivity or resistivity apparent that is monitored over time, and the distance to the anomaly is determined from the values of the apparent conductivity or resistivity apparent.