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Fiber Bragg grating temperature and pressure sensor capable of being connected in series to form array

A fiber optic Bragg, temperature and pressure technology, applied in the field of sensors, can solve the problems of inability to accurately monitor pressure and temperature, high temperature sensitivity of pressure grating, difficult multi-point monitoring, etc., to reduce temperature sensitivity, increase pressure sensitivity, and reduce high temperature drift Effect

Pending Publication Date: 2022-07-05
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the optical fiber FA-P cavity temperature and pressure sensor has the advantage of a large measurement range, but it is difficult to reuse and it is difficult to form a multi-point monitoring in series
There are also downhole pressure sensors for optical fiber oil wells disclosed in the prior art, but the pressure grating has high temperature sensitivity and is prone to drift in high temperature environments, making it impossible to accurately monitor pressure and temperature

Method used

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  • Fiber Bragg grating temperature and pressure sensor capable of being connected in series to form array
  • Fiber Bragg grating temperature and pressure sensor capable of being connected in series to form array
  • Fiber Bragg grating temperature and pressure sensor capable of being connected in series to form array

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Embodiment Construction

[0031] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" can also be intended to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or Various other features, steps, operations, elements, components, and / or combinations thereof. Method steps, procedures, and operations described herein are not to be construed as requiring that they be performed in the particular order described or illustrated, unless an order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0032] Although the terms first, second...

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Abstract

The invention relates to a fiber bragg grating temperature and pressure sensor capable of being connected in series to form an array. The fiber bragg grating temperature and pressure sensor comprises at least two fiber bragg grating temperature and pressure sensors connected in series. Each fiber bragg grating temperature and pressure sensor comprises a pressure expansion pipe, a base, a first fiber bragg grating and a second fiber bragg grating; the pressure expansion pipe penetrates through the base, is fixed to the base and is used for converting pressure in the pipe into displacement of the tail end of the pipe. A first fiber bragg grating is arranged at the tail end of the pressure expansion pipe, and the first fiber bragg grating is arranged between the pressure expansion pipe and the base and used for sensing pressure; the base has a temperature compensation function and is used for performing temperature compensation on the first fiber bragg grating; the second fiber bragg grating is used for sensing temperature, and one end of the second fiber bragg grating is connected with the first fiber bragg grating. By designing the pressure expansion pipe and the temperature compensation base, the precision of pressure measurement in the underground high-temperature environment is improved.

Description

technical field [0001] The invention relates to a fiber Bragg grating temperature and pressure sensor which can be applied in oil wells and can be arrayed in series, and relates to the technical field of sensors. Background technique [0002] Real-time monitoring of downhole pressure, temperature and other parameters is one of the important measures to optimize oil recovery technology and improve oil and gas recovery and production. Due to the high temperature and pressure in oil wells, when long-term online monitoring is required, the reliability of traditional electronic pressure sensors is greatly reduced in high temperature and high pressure environments, or there is a problem of long-term drift. [0003] Optical fiber sensors have the advantages of high sensitivity, anti-electromagnetic interference, long-distance transmission, and high reliability, and can place sensors and optical cables downhole. Electronic equipment such as testing instruments are placed on the gro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/3206G01L1/24G01L11/02
CPCG01K11/3206G01L1/246G01L11/025
Inventor 李梦博李中许亮斌盛磊祥刘兆年郝希宁张天玮黎玉婷
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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