Patent ID: 8354939
Filing Date: 2013-01-15
Classification: E21B

Abstract:
1. A logging radar system for measuring fractures and down-hole formation conditions in a subterranean formation by a logging device, comprising: a wellbore casing; at least one radar source for generation of at least one source radar signal; at least one optical source; at least one optical modulator in communication with at least one said radar source and at least one said optical source for modulating at least one optical signal according to at least one said source radar signal having at least one predetermined frequency; at least one photodiode for converting the modulated optical signal output from at least one said optical modulator to at least one said source radar signal; at least one transmitter and receiver unit comprising: (a) at least one antenna communicating with at least one said photodiode, for receiving at least one said source radar signal from at least one said photodiode and transmitting at least one said source radar signal into the subterranean formation and receiving a reflected radar signal; and (b) a mixer, in communication with at least one said photodiode and at least one said antenna, for mixing the reflected radar signal with at least one said source radar signal to provide an output, wherein the antenna is functionally attached to the wellbore casing, wherein the antenna is located on the outside of the wellbore casing.