Fiber optic sensing system for monitoring restrictions in hydroc

Details Fiber optic sensing system for monitoring restrictions in hydroc Fiber optic sensing system for monitoring restrictions in hydroc

1996-11-07

1998-12-01

Palmer, Phan T. H.

Optical waveguides

Optical waveguide sensor

385 16, 385 27, 385 37, 356 32, G02B 600

Patent

active

058450335

ABSTRACT:
A sensor apparatus and method for identifying a restriction in the flowline of a hydrocarbon production system, utilizes an optical fiber or optical fiber cable which is engaged along and preferably spirally wound around and along the flowline. Spaced apart strain gauges which are advantageously in the form of Bragg grating sensors, are engaged with the optical fiber at spaced locations along the flowline. The strain gauges are also engaged with the flowline to measure strain in the flowline. The hoop strain in particular indicates a change in pressure which can be measured by light signals supplied to and received from the optical fiber. Differences in strain along the flowline indicate pressure gradients in the flowline which in turn identify restrictions in the flowline.

REFERENCES:
patent: 4717253 (1988-01-01), Pratt, Jr.
patent: 4806012 (1989-02-01), Meltz et al.
M. Davis et al., "Interrogation of 60 Fibre Bragg Grating Sensors with Microstrain Resolution Capability", Electronics Letters, vol. 32, Jul. 18, 1996 pp. 1393-1394.
M. Davis et al., "A 60 Element Fiber Bragg Grating Sensor System" Nava Research Laboratory, pp. 2-5 1996 (No Month).
Deepstar 200 Presentation Overheads, on Nov. 14, 1995.

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