High temperature and pressure fiber optic feedthrough for boreho

Details High temperature and pressure fiber optic feedthrough for boreho High temperature and pressure fiber optic feedthrough for boreho

1988-11-03

1990-01-02

Steinberger, Brian S.

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

350 962, 350 9621, G02B 638

Patent

active

048916404

ABSTRACT:
A high temperature and high pressure fiber optic feedthrough is set forth to enable communication to the interior of a pressure housing making up a downhole logging tool. An optical fiber is stripped of protective wraps and coverings other than a fluorocarbon coating. It is inserted into a feedthrough fitting formed of an elongate body that feeds to the pressure housing. There is an axial bore which has an internal cavity at the upper end. This cavity receives a conic section of a resilient body which is deformable. Through the use of a specially designed syringe, the optical fiber is passed through this cavity and is positioned on the interior bore of the body. The resilient material is able to expand on application of pressure. The cavity is closed by means of a retainer nut and wear washer. When the nut is tightened, the resilient material extrudes around and along the optical fiber and seals against it to perfect a high pressure, high temperature seal against the intrusion of well fluids.

REFERENCES:
patent: 4184741 (1980-01-01), Hawk et al.
patent: 4682848 (1987-07-01), Cairns et al.
patent: 4759601 (1988-07-01), Kautsen et al.

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