Fiber optic well logging cable
First Claim
1. A cable comprising:
- an optical fiber;
a corrugated-wall tube having a plurality of maximum diameter portions surrounding said optical fiber, each said maximum diameter portion containing a substantially toroidally shaped ring, said tube being pressure sealed to exclude fluids from a wellbore from entering said tube under hydrostatic pressure, said tube having an elastic limit at least equal to a predetermined axial strain value on said cable, said tube adapted to withstand crushing in normal use when a lateral force is applied to said cable; and
armor wires wound around said tube.
1 Assignment
0 Petitions
Accused Products
Abstract
A well logging cable including an optical fiber and a pressure sealed enclosure surrounding the fiber. The enclosure is adapted to be able to be elongated to the maximum expected axial strain on the logging cable without permanent deformation. In one embodiment, the enclosure is a corrugated-wall tube surrounding the optical fiber. The tube contains toroidally shaped rings within the maximum diameter portions of the corrugations in the tube wall. The cable includes armor wires wound around the corrugated-wall tube. In the preferred embodiment, the tube is surrounded by an elastomeric jacket, and is filled with hydraulic oil or the like to prevent entry of wellbore fluids into the tube under hydrostatic pressure.
120 Citations
11 Claims
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1. A cable comprising:
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an optical fiber; a corrugated-wall tube having a plurality of maximum diameter portions surrounding said optical fiber, each said maximum diameter portion containing a substantially toroidally shaped ring, said tube being pressure sealed to exclude fluids from a wellbore from entering said tube under hydrostatic pressure, said tube having an elastic limit at least equal to a predetermined axial strain value on said cable, said tube adapted to withstand crushing in normal use when a lateral force is applied to said cable; and armor wires wound around said tube. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cable comprising:
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an optical fiber; a wire helically wound around said optical fiber, said wire resistant to crushing thereof under a lateral force on said cable and having an elastic limit at least as large as a predetermined axial strain value; an outer elastomeric jacket disposed on an exterior surface of said wire, said jacket being pressure sealed to exclude fluids from a wellbore from entering said jacket under hydrostatic pressure; and armor wires wound around said jacket. - View Dependent Claims (8, 9, 10, 11)
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Specification