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

A technology of fiber grating and temperature compensation, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of low detection pressure of fiber grating pressure sensors, low sensitivity of temperature and pressure sensors, and small detection range, etc., to improve Effect of pressure and temperature measurement range, improvement of repeatability and stability, improvement of measurement accuracy

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

Traditional methods mostly use electrical measurement methods, which are easily limited by conditions such as downhole high-temperature environment and electromagnetic interference. At present, the use of fiber bragg gratings to replace electrical measurement methods has attracted much attention at home and abroad, but so far, it has been used in heavy oil injection in China. A fiber grating sensor suitable for detecting temperature and pressure in a high temperature and high pressure well with a wide range has not been reported yet.
[0005] The existing fiber grating temperature sensor can only detect the maximu

Method used

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

Examples

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Example Embodiment

[0022] Example 1

[0023] in figure 1 In this embodiment, the internal pressure type temperature compensation high temperature and high pressure fiber grating sensor is composed of optical fiber 1, left capillary steel pipe 2, left connecting head 3, oil inlet 4, elastic base 5, housing 6, and pressure sensing fiber grating 7. , Temperature sensing fiber grating 8, right connecting head 9, right capillary steel pipe 10 are connected together.

[0024] An oil inlet 4 is machined radially on the left side of the shell 6, and the oil and natural gas under the oil and gas well can enter the shell 6 from the oil inlet. The two ends of the shell 6 are threaded and pass through the shell 6. The threaded connection is equipped with an elastic base 5, the left end of the elastic base 5 and the housing 6 is welded and sealed with the inside of the housing 6 after threaded connection, and the left end of the elastic base 5 should be located on the right side of the oil inlet. The left end o...

Example Embodiment

[0026] Example 2

[0027] In this embodiment, the wall thickness d of the pressure fiber grating substrate 5-2 is 0.8 mm, the length a is 30 mm, the length b of the temperature fiber grating substrate 5-3 is 15 mm, and the production wavelength of the temperature sensing fiber grating 8 is 1430 nm , The production wavelength of the pressure sensing fiber grating 7 is 1435nm. The other parts and the connection relationship of the parts are the same as in the first embodiment.

Example Embodiment

[0028] Example 3

[0029] In this embodiment, the wall thickness d of the pressure fiber grating substrate 5-2 is 2 mm, the length a is 60 mm, and the length b of the temperature fiber grating substrate 5-3 is 20 mm. The manufacturing wavelength of the temperature sensing fiber grating 8 is 1650 nm, and the manufacturing wavelength of the pressure sensing fiber grating 7 is 1655 nm. Other parts and the connection relationship of the parts are the same as in the first embodiment.

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Abstract

The invention relates to an intrinsic pressure type temperature compensation high-temperature high-pressure fiber grating sensor. A shell is provided with an inlet port in the radial direction, a left end of the shell is provided with a left coupling head of a left capillarity steel pipe, and a right end thereof is provided with a right coupling head of a right capillarity steel pipe, an elastic base is arranged in the shell and positioned at the side of the inlet port, the edge of the elastic base is provided with axial holes, an optical fiber is provided with a pressure sensing fiber grating and a temperature sensing fiber grating, and penetrates the left capillarity steel pipe to be arranged at the outer side of the elastic base, and the other end of the optical fiber extends out of the shell through the right capillarity steel pipe. By laboratory tests and high-temperature high-pressure oil well actual examination on the producing scene, the sensor of the invention has the pressure detection range of 0 to 100MPa, the temperature detection range of minus 30 to plus 350 DEG C, the pressure sensitivity coefficient of 14pm/MPa, the temperature sensitivity coefficient of 12pm/DEG C, the pressure absolute precision of plus or minus 0.2MPa and the temperature absolute precision of plus or minus 0.5 DEG C, and can be promoted and applied under the oil well.

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] The fiber grating sensor can detect many physical quantities such as pressure, temperature, stress, displacement, strain, flow velocity, flow rate, viscosity, etc., because of its simple structure, small size, light weight, corrosion resistance, strong anti-electromagnetic interference ability, and easy realization of wave Since it came out in the 1970s, it has received widespread attention at home and abroad. At present, it is devoting itself to the development and application research of fiber grating sensors. [0003] Zhao Yong of Tsinghua University and others once proposed to use the cantilever beam structure placed in the free elastic cylindrical pressure transducer to realize the fiber grating sensor for...

Claims

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Application Information

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IPC IPC(8): E21B47/06G01K11/32G01L11/02G01K1/08G01K11/3206
Inventor 乔学光王宏亮冯德全樊伟王向宇周红宋利娜
Owner XI'AN PETROLEUM UNIVERSITY
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