Armored Optical Cable Adhesive Bonding for Fiber Shift Control
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Solution Overview
Problem
Existing armored fiber optic cables face challenges with optical fibers shifting longitudinally due to weight, leading to optical loss and potential fracture failure, especially when deployed downhole in oil and gas wells.
Innovation Solution
The solution involves attaching one or more optical fibers to the inner wall of the armored cable using an adhesive material, which can be applied as a continuous or intermittent strip, to secure the fibers in place and prevent axial shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fibers are left loose in the armored cable, then the cable structure is simpler and easier to manufacture, but the optical fibers shift longitudinally causing optical loss and potential fracture failure
Solution Approach 1:
The adhesive material is applied to the inner wall of the armored cable before the optical fibers are inserted. This preliminary action ensures that when the fibers are placed in the cable, they are immediately secured in position, preventing longitudinal shifting during deployment while maintaining a relatively simple overall cable structure.
Solution Approach 2:
An adhesive material is introduced as an intermediary substance between the optical fibers and the inner wall of the armored cable. This adhesive mediator bonds the fibers to the cable structure, eliminating longitudinal movement issues without requiring complex mechanical retention systems.
2Reliability
If adhesive material is applied continuously along the inner wall, then optical fiber movement is completely prevented, but the amount of adhesive material increases and cost rises
Solution Approach 1:
The continuous adhesive application is segmented into discrete adhesive elements spaced at intervals along the inner wall of the armored cable. This segmentation maintains optical fiber positioning stability at critical points while significantly reducing the total quantity of adhesive material required compared to continuous coating.
Solution Approach 2:
Adhesive material is applied selectively at specific locations along the inner wall where fiber positioning is most critical, rather than uniformly throughout. This local quality approach ensures reliability where needed while minimizing overall adhesive consumption and associated costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces optical fiber movement within the armored cable, minimizing the risk of optical loss and fracture failure, while also enhancing the cable's sensitivity to acoustic and thermal signals.
Implementation Method 1
attaching one or more optical fibers to the inner wall of the armored cable using an adhesive material
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for making armored cables. An example method for making an armored cable includes forming a strip stock into an armor tubing; welding a seam of the armor tubing in a welding zone; inserting at least one of a first optical fiber or a first wire into a first end of a first guide tube, wherein: the first guide tube extends through the welding zone; the first guide tube protects the at least one of the first optical fiber or the first wire during the welding of the seam; and the first guide tube is not part of the armored cable after the making of the armored cable; and supporting the first guide tube within the armor tubing by a plurality of support legs such that the first guide tube does not contact the armor tubing.