Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

NON-POLYMER DIELECTRIC SUBSEA TRANSMISSION LINE

IP.com Disclosure Number: IPCOM000248474D
Publication Date: 2016-Dec-05
Document File: 4 page(s) / 304K

Publishing Venue

The IP.com Prior Art Database

Abstract

Currently transmission lines for communications and power delivery are widely used in subsea environments. These cables and associated connectors generally utilize polymeric dielectric insulators to enhance transmission. However, the properties of the polymer dielectric may vary with temperature which may have an effect on transmissions and in associated electronics. Therefore, it is proposed that an insulating element be employed in the transmission line that is not a polymer dielectric. For example, air, gas or vacuum conditions which are comparatively negligibly affected by temperature changes may be utilized in place of the polymer dielectric.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 51% of the total text.

Page 01 of 4

 NON-POLYMER DIELECTRIC SUBSEA TRANSMISSION LINE SUMMARY

[0001] Currently transmission lines for communications and power delivery are widely used in subsea environments. These cables and associated connectors generally utilize polymeric dielectric insulators to enhance transmission. However, the properties of the polymer dielectric may vary with temperature which may have an effect on transmissions and in associated electronics. Therefore, it is proposed that an insulating element be employed in the transmission line that is not a polymer dielectric. For example, air, gas or vacuum conditions which are comparatively negligibly affected by temperature changes may be utilized in place of the polymer dielectric. DESCRIPTION
[0002]
A key element in the subsea oil and gas industry is the capability of accurately monitoring production. One application is to detect early water breakthrough and monitor formation water production to prevent hydrate formation and corrosion. A microwave reflection sensor or microwave antennae in contact with the well effluent, and coaxial transmission lines can provide information about the effluent composition and the properties of the individual constituents in the effluent. An example is measurement of the water conductivity. The subsea production environment often sees high pressures and high temperatures impacting the measurement accuracy. The sensor or antenna needs to be in direct contact with process fluids that may be at high temperatures, while the signal, travelling along a transmission line going through thermal insulation, is processed in electronics located in the chamber at lower temperature, typically close to seawater temperature. In particular, the temperature gradient, from high temperature around the sensor or antenna, to low temperature around the electronics,

1


Page 02 of 4

can influence measurement accuracy. This is particularly true in the case of conventional coaxial conductors with polymeric dielectrics, which are most commonly utilized. Thus, the present embodiments propose replacement of these polymer dielectrics as noted above.

[0003] Utilizing a non-polymer dielectric insulating element in the transmission line allows signal to be transferred from high temperature to low temperature without being significantly influenced by temperature and thermal gradients. A secondary pressure barrier can also be introduced. That is, the first pressure barrier is the sensor or antenna with a sealing in contact with process fluids at line pressure. The second pressure barrier is then located at the opposite side of the transmission line, being capable of retaining the full process pressure in the unlikely event of the first pressure barrier failing.

[0004] The figure here provides a schematic overview of a possible configuration of such a system to reduce temperature effects on measurements.


[0005] In today's subsea oil and gas...