Multipurpose permanent electromagnetic sensing system for monitoring wellbore fluids and formation fluids

A method for dual-purpose electromagnetic sensing to monitor wellbore fluids and formation fluids, the method comprising:

• placing an array of transmitters and one or more receivers along a casing in a wellbore;
• mounting, on a same ferrite sleeve that is positioned over a same collar that is positioned on and around the casing, a transmitter in the array of transmitters and a receiver of the one or more receivers forming a transmitter-receiver pair, wherein the transmitter and the receiver are coils;
• receiving, at the receiver, a signal originating from the transmitter and at least one other signal originating from at least one other transmitter in the array of transmitters;
• communicating, from the receiver via a waveguide, the signal and the at least one other signal to a processor;
• identifying, by the processor, a type of fluid in the wellbore in a vicinity of the transmitter-receiver pair based upon the signal;
• and
• identifying, by the processor, a type of another fluid in a formation around the wellbore based upon the at least one other signal.

A dual-purpose electromagnetic sensing tool for monitoring wellbore fluids and formation fluids, comprising:

• an array of transmitters and one or more receivers adapted to be located along a casing in a wellbore;
• and
• a receiver of the one or more receivers forming a transmitter-receiver pair with a transmitter in the array adapted to receive a signal originating from the transmitter and at least one other signal originating from at least one other transmitter in the array, the signal being used to identify a type of fluid in the wellbore in a vicinity of the transmitter-receiver pair and the at least one other signal being used to identify a type of another fluid in a formation around the wellbore,
• wherein the receiver and the transmitter are coils mounted on a same ferrite sleeve that is positioned over a same collar that is positioned on and around the casing.