Methods and systems for optical endpoint detection of a...

Details Methods and systems for optical endpoint detection of a... Methods and systems for optical endpoint detection of a...

2006-02-21

2006-02-21

Bagnell, David (Department: 3672)

Wells

Processes

With indicating, testing, measuring or locating

C166S066000, C166S066700

Reexamination Certificate

active

07000698

ABSTRACT:
Methods and systems for optical endpoint detection of a sliding sleeve valve are disclosed. The system comprises fiber optic cable based sensors (e.g., fiber Bragg gratings or fiber optic coils) positioned in a recess within the valve's housing and affixed proximate to the ends of the cavity in which the sleeve travels. When the sleeve reaches the ends of the cavity, it imparts a stress onto an area of the housing, which preferably constitutes a protrusion within the cavity, which in turn stresses the sensor and changes its reflection profile. This change in reflection profile indicates that the sleeve has traveled to an end point inside the valve, and accordingly that the valve is fully open or fully closed.

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