US Patent 10920578 Method for finding position of collars

A method and system for determining location of a collar in a wellbore. A method may comprise taking an electromagnetic measurement, producing an electromagnetic log from the electromagnetic measurement, wherein the electromagnetic log comprises a plurality of channels, and locating a position of the collar in the electromagnetic log based on a collar signature in the electromagnetic log. A system may comprise an electromagnetic logging tool. The electromagnetic logging tool may comprise at least one receiver and at least one transmitter. The system may further comprise a conveyance and an information handling system, wherein the information handling system is configured to receive an electromagnetic measurement from the electromagnetic logging tool, produce an electromagnetic log from the electromagnetic measurement, wherein the electromagnetic log comprises at least one channel, and locate a position of a collar in the electromagnetic log with a collar signature.