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Gold coated signal cable

a signal cable and gold coating technology, applied in the field of signal cables, can solve the problems of very low hydrogen solubility and very low hydrogen permeability rate in gold, and achieve the effect of reducing local hydrogen production

Inactive Publication Date: 2001-11-29
OPTOPLAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] One object of the invention is to provide a signal cable for transmission of optical signals in oil and gas wells, said cable preventing or reducing the penetration of hydrogen into the fiber material.

Problems solved by technology

Secondly, the solubility of hydrogen in gold is very low, and therefore the permeability rate for hydrogen in gold is very low.

Method used

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  • Gold coated signal cable

Examples

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Embodiment Construction

[0028] This calculation example is put forward in order to illustrate the barrier effect of gold, with a coating thickness of 3 micrometers as a function of temperature and time, in comparison with an unprotected steel tube.

[0029] The table which is given below, presents the calculation results for an unprotected steel tube (Inconel 625) and a steel tube provided with a 3 micrometers thick gold coating after 1 and 5 years, at a partial pressure of hydrogen at 1 and 100 atmospheres at 100 and 200.degree. C. It is assumed that the steel tube has an outer diameter of 1.8 mm, and an inner diameter of 1.4 mm. These are realistic dimensions for most applications. The hydrogen permeability for gold is about 1.multidot.10.sup.-4 exp(-15840 / T)mol / cm sec.{square root}atm. The hydrogen permeability for Inconel 625 is about 8.16.multidot.10.sup.-7 exp(-7232 / T)mol / cm sec.{square root}atm. T is the absolute temperature in K.

1TABLE 1 Calculated pressure of hydrogen in a steel tube with and without...

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Abstract

Signal cable for transmission of optical signals in oil and gas wells, said cable comprising one or more optical fibers (1) wrapped in at least one pressure- and temperature-resistant, hollow and generally channel-shaped, protection means (2), optionally placed near, or integrated with, a cable construction. The protection means (2) is provided with a thin continuous surface coating (3) of gold to passivate the formation of hydrogen, and to prevent or reduce the diffusion of hydrogen through the protection means and into the optical fiber, and accordingly prevent resulting loss of signal in the fiber.

Description

[0001] The invention relates to a signal cable for transmission of optical signals in oil and gas wells, as appears from the preamble of patent claim 1.[0002] Signal cables are i.a. used in oil and gas wells for measurement of such parameters as pressure, temperature, tension, flow, and for fiber optic communication. The cables may have a length of 6 km or more for use in wells, and should tolerate temperatures of 200.degree. C. and pressure over 1000 bar. In addition, the cables are vulnerable to corrosion because they are usually located in the liquid filled annulus between the casing and the tubing.[0003] NO patent-publication 175119 describes a cable for this application, where the fiber is inside a steel tube which protects it from the hydrostatic pressure which normally will be several hundred bar. The tube is stranded around a center element, and the fiber is able to move sidewise in the tube so that some elongation of the cable due to thermal expansion and / or mechanical tens...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B6/44
CPCG02B6/4402G02B6/4492G02B6/44382
Inventor HORDVIK, AUDUNERIKSRUD, MORTEN
Owner OPTOPLAN
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