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Sensing and testing fiber grating system for oil and gas pipeline detection

A fiber grating and test system technology, applied in the direction of transmitting sensing components, pipeline systems, gas/liquid distribution and storage with optical devices, to achieve the effect of wide measurement range, small volume and simple structure

Active Publication Date: 2004-09-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research and application of using fiber gratings for multi-parameter and multi-point distribution testing has not been reported yet.

Method used

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  • Sensing and testing fiber grating system for oil and gas pipeline detection
  • Sensing and testing fiber grating system for oil and gas pipeline detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Simultaneously measure the pressure at multiple points in a 3km long oil and gas pipeline.

[0029] The measurement length is 3km, and the distance between adjacent detection points is 20m, so there are 150 detection points, that is, 150 pressure fiber grating sensors with different coupling resonance wavelengths are selected, and the bandwidth of each fiber grating sensor is 2nm.

[0030] The output power of each broadband semiconductor laser SLD is 1mw, and the working wavelength bandwidth is 50nm. Each SLD center wavelength can cover 25 fiber grating sensors, so 6 SLDs with different center wavelengths are required, and the center wavelengths are λ 1 =1300nm, λ 2 =1350nm, λ 3 =1400nm, λ 4 =1450nm, λ 5 =1500nm, λ 6 =1550nm, the working wavelength range of the six SLD arrays is 1275nm~1575nm.

[0031] According to the central wavelength and bandwidth range of the broadband semiconductor laser SLD array 1, the coupling resonance wavelengths of all fiber ...

Embodiment 2

[0034]Example 2: Simultaneous and differentiated measurement of the temperature and pressure of a 2km long oil and gas pipeline

[0035] The measurement length is 2km, and the distance between adjacent detection points is 10m, so there are 200 detection points, that is, 100 temperature FBG sensors and 100 pressure FBG sensors with different coupling resonance wavelengths are selected, and the bandwidth of each FBG sensor is 2nm.

[0036] The output power of each broadband semiconductor laser SLD is 1mw, and the working wavelength bandwidth is 80nm. Each SLD center wavelength can cover 40 fiber grating sensors, so five SLDs with different center wavelengths are required, and the center wavelengths are λ 1 =1300nm, λ 2 =1380nm, λ 3 =1460nm, λ 4 =1540nm, λ 5 =1620nm, the working wavelength range of 5 SLD arrays is 1260nm~1660nm.

[0037] According to the central wavelength and bandwidth range of the broadband semiconductor laser SLD array 1, the coupling resonance wavelengths...

Embodiment 3

[0039] Example 3: Simultaneous and differentiated measurement of the temperature and pressure of a 2km long oil and gas pipeline

[0040] The principle of this embodiment is the same as that of Embodiment 2,

[0041] The principle of this embodiment is the same as that of Embodiment 2, except that a temperature FBG sensor and a pressure FBG sensor are arranged near each detection point, and the distance between the two FBG sensors is 100 μm-400 μm.

[0042] The measurement length is 2km, and the distance between adjacent detection points is 20m, so there are 100 detection points, and one temperature fiber grating sensor and one pressure fiber grating sensor are arranged near each detection point, and temperature fiber grating sensors and pressure fiber grating sensors with different coupling resonance wavelengths are selected. There are 100 pressure fiber grating sensors each, and each fiber grating sensor has a bandwidth of 2nm.

[0043] The output power of each broadband se...

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Abstract

The present invention provides one kind of system to perform distributive multi-point detection for corrosion, crack, leakage, wax precipitation, scaling and other status in long oil and gas conveying pipeline by means of fiber grating sensing technology. The system includes near-infrared wide-band semiconductor laser source array, wavelength division multiplexer, bi-directional fiber coupler, fiber grating sensor array, spectral analyzer and signal transmission optical cable. The continuous near-infrared light signal the laser source array emits is transmitted to fiber grating sensor array embedded inside the long oil and gas conveying pipeline through the wavelength division multiplexer and the bi-directional fiber coupler, the sensor array detects the varying temperature and pressure of fluid inside the pipeline and reflects to the bi-directional fiber coupler while being coupled to the analyzer and the computer to obtain the conveying status inside the pipeline.

Description

[0001] Involved areas [0002] The invention belongs to the technical field of detection of oil and gas pipelines, and is a multi-parameter and multi-point distributed detection system for corrosion, cracks, waxing, scaling and other conditions in oil and gas pipelines by optical fiber grating sensing technology. Fiber Bragg grating sensing test system for oil and gas pipeline detection. Background technique [0003] Pipeline inspection technology is a high-tech developed by developed countries in the pipeline industry. It is mainly used to detect potential safety hazards such as corrosion, wear, and cracks in long-distance oil and gas transmission pipelines during use. At present, the magnetic flux leakage method, ultrasonic method, eddy current method, electromagnetic induction method, etc. are basically used in the detection of long-distance oil and gas pipelines. Although these methods have experienced decades of development and improvement, they generally have low detecti...

Claims

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Application Information

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IPC IPC(8): F17D5/02G01D5/26
Inventor 乔学光
Owner BC P INC CHINA NAT PETROLEUM CORP
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