Sensor failure diagnosis in a pump monitoring system

A method of identifying a failed strain sensor in a wellbore, the method comprising:

• receiving, by a processor, a strain signal from a strain sensor in or on a fluid end of a pump, and a vibration signal from a vibration detector;
• identifying, by the processor, an irregularity in the strain signal corresponding to a potential strain sensor failure;
• determining, by the processor, that an operational signal component corresponding to an irregularity in the pump function is not present in the vibration signal, corresponding to a failure of the strain sensor that indicates that the strain sensor is disconnected from the pump;
• and
• displaying, by the processor, an indication that the strain sensor has failed in response to determining that the operational signal component is absent from the vibration signal.

A non-transitory computer-readable medium that includes instructions that are executable by a processor for causing the processor to identify a failed strain sensor in a pump associated with a wellbore, by performing operations comprising:

• receiving a strain signal from a strain sensor in or on a fluid end of a pump, and a vibration signal from a vibration detector;
• identifying an irregularity in the strain signal corresponding to a potential strain sensor failure;
• determining that an operational signal component corresponding to an irregularity in the pump function is not present in the vibration signal, corresponding to a failure of the strain sensor that indicates that the strain sensor is disconnected from the pump;
• and
• displaying an indication that the strain sensor has failed in response to determining that the operational signal component is absent from the vibration signal.