Title:
DETECTING BROADSIDE AND DIRECTIONAL ACOUSTIC SIGNALS WITH A FIBER OPTICAL DISTRIBUTED ACOUSTIC SENSING (DAS) ASSEMBLY
Document Type and Number:
WIPO Patent Application WO/2011/079107
Kind Code:
A3
Abstract:
A Distributed Acoustic Sensing (DAS) fiber optical assembly comprises adjacent lengths of optical fiber A, B with different directional acoustic sensitivities, for example by providing the first length of optical fiber A with a first coating 35, such as acrylate, and the second length of optical fiber B with a second coating 36, such as copper, wherein the first and second coatings 35 and 36 may be selected such that the Poisson's ratio of the first length of coated fiber A is different from the Poisson's ratio of the second length of coated fiber B. The different Poisson's ratios and/or other properties of the adjacent lengths of optical fiber A and B improve their directional acoustic sensitivity and their ability to detect broadside (radial) acoustic waves.
Inventors:
MESTAYER JEFFERY JOSEPH (US)
WILLS PETER BERKELEY (CA)
WILLS PETER BERKELEY (CA)
Application Number:
PCT/US2010/061478
Publication Date:
October 20, 2011
Filing Date:
December 21, 2010
Export Citation:
Assignee:
SHELL OIL CO (US)
SHELL INT RESEARCH (NL)
MESTAYER JEFFERY JOSEPH (US)
WILLS PETER BERKELEY (CA)
SHELL INT RESEARCH (NL)
MESTAYER JEFFERY JOSEPH (US)
WILLS PETER BERKELEY (CA)
International Classes:
G01V1/40; E21B47/00; G01V1/48
Foreign References:
| US4297887A | 1981-11-03 | |||
| US6596394B2 | 2003-07-22 | |||
| US4621896A | 1986-11-11 | |||
| US5373487A | 1994-12-13 |
Attorney, Agent or Firm:
WATKINS, Marcella, D. (One Shell PlazaP.O. Box 246, Houston TX, US)
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