OPTICAL FIBER FEEDTHROUGH INCORPORATING FIBER BRAGG GRATING

摘要

Methods and systems for effectively sealing a fiber optic line to a pressure gauge device are disclosed. A pressure gauge device has an outer body, a reference volume within the outer body and a pressure sensor having a first side and a second side. The first side of the pressure sensor is exposed to a pressure inlet and the second side of the pressure sensor is exposed to the reference volume. A fiber optic line is coupled to the pressure gauge device using a feedthrough device. The fiber optic line comprises a first fiber optic line portion located within the feedthrough device, a second fiber optic line portion located within the reference volume and a third fiber optic line portion located within a cable located outside the pressure gauge device and coupled to the feed through device. The first fiber optic line portion comprises a first Fiber Bragg Grating (“FBG”).

主权项

1. A system for monitoring pressure in a subterranean formation comprising:
a pressure gauge device having an outer body, a reference volume within the outer body and a pressure sensor having a first side and a second side,
wherein the first side of the pressure sensor is exposed to a pressure inlet and the second side of the pressure sensor is exposed to the reference volume;a feedthrough device; anda fiber optic line coupled to the pressure gauge device,wherein the fiber optic line comprises a first fiber optic line portion located within the feedthrough device, a second fiber optic line portion located within the reference volume and a third fiber optic line portion located within a cable located outside the pressure gauge device and coupled to the feed through device,wherein the first fiber optic line portion comprises a first Fiber Bragg Grating (“FBG”).