Strain sensitive optical fiber cable package for downhole distributed acoustic sensing
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United States of America Patent
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Feb 26, 2019
Grant Date -
Sep 14, 2017
app pub date -
Mar 10, 2015
filing date -
Mar 10, 2015
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Abstract
A distributed acoustic sensing cable package having a polymer composite extruded over an optical waveguide to encase the waveguide and to form a crystalline matrix layer acoustically coupled to the waveguide. The crystalline matrix includes reinforcement fibers to further enhance transmission of a cable strain to the optical waveguide. During manufacture of the cable, the polymer composite may be extruded over the optical waveguide and subsequently subjected to heat treatment to increase the crystallinity of the polymer composite and increase the elastic modulus. Both axial and radial strain fields are effectively interact with cased fiber waveguide for producing measurable phase shift signal for distributed acoustic noise detection.
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