Patent ID: 7598898
Filing Date: 2009-10-06
Classification: G01S,G01V

Abstract:
1. A method for radar logging down-hole in a wellbore of a subterranean formation without any down-hole cooling devices, the method comprising the steps of: providing at least one radar source having at least one predetermined frequency; providing at least one optical source having a predetermined wavelength; modulating at least one optical signal with at least one optical modulator in communication with at least one said radar source and at least one said optical source, at least one said optical signal being modulated according to at least one said radar source having the predetermined frequency; providing at least one said modulated optical signal to a transmitter and receiver unit, wherein the transmitter and receiver unit comprises: (a) at least one photodiode for converting at least one said modulated optical signal output from at least one said optical modulator to at least one radio frequency source radar signal; (b) at least one antenna in communication with at least one said photodiode; and (c) a mixer in communication with at least one said photodiode and at least one said antenna; and at least one said antenna receiving at least one said radio frequency source radar signal from at least one said photodiode, at least one said antenna transmitting at least one said radio frequency source radar signal into the formation, and at least one said antenna receiving a reflected radar signal; and the mixer mixing the reflected radar signal with at least one said radio frequency source radar signal to provide an output, then utilizing the output to identify fracture geometry.