Oil and gas well packer having fiber optic Bragg Grating sensors for downhole insitu inflation monitoring
US5925879A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | May 9, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.