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External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor

A temperature compensation, high temperature and high pressure technology, used in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of small detection range, large detection error, low sensitivity, etc., to overcome the elastic hysteresis effect and improve linearity. , the effect of prolonging the service life

Inactive Publication Date: 2008-12-17
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing fiber grating temperature and pressure sensors that measure temperature and pressure at the same time, due to the cross-sensitive interaction of temperature and pressure, make this fiber grating temperature and pressure sensor low in sensitivity, large in detection error, and small in detection range

Method used

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  • External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor
  • External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor
  • External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0018] exist figure 1 Among them, the external pressure temperature compensation high temperature and high pressure fiber grating sensor of this embodiment consists of an optical fiber 1, a left capillary metal tube 2, a left outer protection tube joint 3, a spring 4, a left heat shrinkable tube 5, a temperature sensing fiber grating 6, Oil inlet hole 7, quartz tube 8, pressure sensing fiber grating 9, outer protection tube 10, quartz plug 11, right heat-shrinkable tube 12, right outer protection tube joint 13, and right capillary metal tube 14 are connected.

[0019] This embodiment adopts an optical fiber 1, and the optical fiber 1 is a quartz single-mode optical fiber. On the left side of the optical fiber 1, a temperature sensing fiber grating 6 is written. The manufacturing wavelength of the temperature sensing fiber grating 6 is 1549nm. Sensing fiber grating 6 is only used to feel the temperature of downhole oil and natural gas. On the right side of optical fiber 1, pres...

Embodiment 2

[0022] In the present embodiment, the wall thickness d of the pressure tube 8-3 is 1.0mm, and the effective length a of the pressure tube 8-3 (the length of the pressure tube 8-3 minus the length of the inserting part of the quartz plug 11) is 50mm. The fabrication wavelength of the temperature sensing fiber Bragg grating 6 is 1532nm, and the fabrication wavelength of the pressure sensing fiber Bragg grating 9 is 1530nm. Other components and the coupling relationship of the components are the same as in Embodiment 1.

Embodiment 3

[0024] In the present embodiment, the wall thickness d of the pressure tube 8-3 is 1.5mm, and the effective length a of the pressure tube 8-3 (the length of the pressure tube 8-3 minus the length of the inserting part of the quartz plug 11) is 70mm. The fabrication wavelength of the temperature sensing fiber Bragg grating 6 is 1552nm, and the fabrication wavelength of the pressure sensing fiber Bragg grating 9 is 1550nm. Other components and the coupling relationship of the components are the same as in Embodiment 1.

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Abstract

The invention relates to an external pressure type temperature compensation high-temperature high-pressure fiber grating sensor. A left end of an outer protecting tube provided with an inlet port in the radial direction is provided with a connector of a left outer protecting tube, and a right end thereof is provided with a connector of a right outer protecting tube, the outer protecting tube is internally provided with a quartz tube, an optical fiber is provided with a temperature sensing fiber grating and a pressure sensing fiber grating, the connector of the left outer protecting tube is provided with a left capillarity metal tube communicated with the interior phase of the outer protecting tube, the connector of the right outer protecting tube is provided with a right capillarity metal tube communicated with the interior phase of the outer protecting tube, the quartz tube is provided with a quartz plug, a left end of the quartz tube is provided with a left heat shrinkage tube communicated with the interior phase of the quartz tube and connected with the left capillarity metal tube, the quartz plug is provided with a right heat shrinkage tube communicated with the interior phase of the quartz tube and connected with the right capillarity metal tube, the left heat shrinkage tube and the right heat shrinkage tube are externally provided with springs, the optical fiber penetrates the left capillarity metal tube and enters the quartz tube through the left heat shrinkage tube, and the other end of the optical fiber extends out of the connector of the right outer protecting tube from the right capillarity metal tube through the right heat shrinkage tube.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to an optical fiber grating sensor for simultaneously distinguishing and measuring high temperature and high pressure. Background technique [0002] Petroleum is an important energy source for human survival and development. With the continuous progress of society, the scientific development of oil and gas is becoming more and more important. To reduce the number of workover operations and shut-in wells, and even reduce the leakage of crude oil, so as to increase the cumulative output of crude oil, it is necessary to use advanced science and technology to carry out long-term tracking and monitoring of the pressure and temperature of oil and gas wells, and to carry out status analysis at any time to improve oil and oil and gas production. It is an important way to improve the economic benefits of crude oil extraction. Therefore, the long-distance monitoring...

Claims

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Application Information

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IPC IPC(8): E21B47/06G01K11/32G01L11/02G01K11/3206
Inventor 乔学光冯德全王宏亮周红王向宇樊伟兆雪李娟妮
Owner XI'AN PETROLEUM UNIVERSITY
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