Patent ID: 9651435
Date: 2017-05-16
CPC Classifications: E21B,G01H,G01K,G01L,G01V

Claim:
1. A downhole optical sensing system, comprising: an optical fiber positioned in a subterranean well, the optical fiber including multiple cores, each core having a Brillouin strain coefficient and a Brillouin temperature coefficient, which coefficients are properties of the core; at least a first one of the cores having a Brillouin scattering coefficient that is different from at least a second one of the cores, wherein the Brillouin scattering coefficient is one of a Brillouin strain coefficient different from that of the at least a second one of the cores or a Brillouin temperature coefficient different from that of the at least a second one of the cores; and an optical sensor disposed in the subterranean well and coupled to one or more of the first one of the cores or the second one of the cores at an end of the optical fiber in the subterranean well distal from earth's surface, the optical sensor operable to sense one or more parameters of the subterranean well, the optical sensor being an optical sensor different from an optical fiber structure.