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Temperature sensor using an optical fiber

a technology of optical fiber and temperature sensor, applied in the field of temperature sensing, can solve the problem that the artificial tension that is not due to temperature will induce an error in the temperature measuremen

Inactive Publication Date: 2009-05-14
LXDATA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006]As embodied and broadly described herein, the invention provides a temperature sensor. The temperature sensor comprises an elongated sensing element having a length of at least 10 m, measured at a temperature of 20°

Problems solved by technology

A challenge in this type of measurement setups is to lay the optical fiber in the well in a way to minimize any tension or bending strains.
Since a tension will have the same effect on a grating as temperature does, namely alter the optical properties of the grating, any artificial tension that is not due to temperature will induce an error in the temperature measurement.

Method used

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Embodiment Construction

[0015]A specific example of implementation will now be provided. This example is made in the context of a Steam Assisted Gravity Drainage (SAGD) production facility. However, it should be clearly understood that the present invention is not limited to this application only and can be used in many other different industries.

[0016]FIG. 1 is a schematic illustration of a SAGD oil production facility. The SAGD process is a thermal heavy oil recovery process. Wells 101 and 102 are drilled in the ground in pairs. The wells are horizontally drilled. The upper well 101 in a pair is the injection well while the lower well 102 in a pair is the production well.

[0017]The oil recovery process begins by injecting steam in both wells 101 and 102 until the bitumen in the area surrounding the well pair is heated enough to flow to the bottom production well 102. Steam circulation continues in the injection well 101 causing the fluid bitumen to flow to the production well 102 by gravity. The liquefied...

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Abstract

A temperature sensor that has an elongated sensing element having a length of at least 10 m, measured at a temperature of 20° C. The elongated sensing element includes an elongated jacket and an optical fiber mounted in the jacket and having an EFL of at least 0.35%, wherein the elongated sensing element has an average temperature error of less than 2° C.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit under 35 USC 119(e) of U.S. Provisional Patent Application No. 60 / 986,766 filed on Nov. 9, 2007 by Bai Zhou et al. and hereby incorporated by reference herein.FIELD OF THE INVENTION[0002]The invention relates to temperature sensing, in particular to a temperature sensor that can measure temperatures by using optical properties of an optical fiber. The invention finds applications in the mining, gas and oil exploration / production industry, in particular the Steam Assisted Gravity Drainage (SAGD) and other heated oil wells or pipelines, serpentine or path probes in various chemical or physical industrial processes, Electric Submersible Pumps (ESP) used for oil recovery or other applications, transformers, heat exchangers, boilers, separation unitary processors, reactors, heat distribution networks, skin probes, thermo-cartography applications, thermo-alarm networks and thermo-aging monitoring applications,...

Claims

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Application Information

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IPC IPC(8): G01K11/32E21B47/07
CPCE21B47/065G01K11/3206E21B47/07
Inventor ZHOU, BAIMIVILLE, SEBASTIENVINCELETTE, ANDRE R.
Owner LXDATA