FIELD: hydrocarbon production in a well.
SUBSTANCE: method includes monitoring the resistance over time of a tubing enclosed conductor (TEC) that electrically connects a first downhole tool to a second downhole tool located in a wellbore deeper than the first downhole tool, and detecting that the TEC has experienced its first TEC failure in response to a change in resistance that is greater than the failure threshold and in response to an amount of change time that is less than the failure time threshold.
EFFECT: provides the ability to predict specific locations where TEC malfunction or failure has occurred, the ability to detect fluid plugging and the presence of foreign fluids in the well.
15 cl, 7 dwg
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