Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-05-09
1999-07-20
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250268, 25023119, 7315251, E21B 4900
Patent
active
059258799
ABSTRACT:
The present invention features an apparatus comprising a packer means and a packer pressure sensing means. The packer means inflates to isolate zones in a well, such as an oil well or a gas well. The packer means responds to a material for inflating and providing a packer inflation pressure. The packer pressure sensing means responds to the packer inflation pressure, for providing a sensed packer inflation pressure signal containing information about a sensed packer inflation pressure when the packer is inflated to isolate zones in the oil or gas well. The packer pressure sensing means may include an internal fiber optic Bragg Grating sensor arranged inside the packer means, for providing the sensed internal packer inflation pressure signal. The packer pressure sensing means may also include an external fiber optic Bragg Grating sensor arranged outside the packer means, for providing the sensed external packer inflation pressure signal. The internal fiber optic Bragg Grating sensor and the external fiber optic Bragg Grating sensor may be either a Bragg Grating point sensor, multiple Bragg Gratings, or a lasing element formed with a pair or pairs of multiple Bragg Gratings.
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Allen Stephone
CiDRA Corporation
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