Radio Frequency Identification (RFID) is a method of storing information on a tag that communicates remotely via radio frequency with an interrogator in order to carry out a function.

RFID is widely used for id pass and security devices in stores, for toll roads and pet tracking, etc. It is also can be used in the oilfield, becoming a means of introducing intelligence into tools without the need for expensive and time-consuming communication systems.

RFID is the technology that will enable changes in the method of communication downhole. The number of round trips of drill string or CT will be reduced, many current ball drop technologies and hydraulic cycling tools will be replaced, and many limitations of present day tools may be eliminated.

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