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Liquid flow non-immersive measuring device and sensing probe

A measuring device and liquid flow technology, which is applied in the field of flow meters, can solve problems such as easy jamming, inability to work for a long time, and limited minimum range of energy flow.

Active Publication Date: 2013-10-09
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because electronic sensors cannot withstand high temperatures, they cannot work for a long time in underground high temperature, high pressure and corrosive environments
There are mainly the following types of optical fiber traditional sensors: turbine flowmeters, vortex flowmeters, Doppler flowmeters, etc., but these types of flowmeters have certain problems when used in oil wells: turbine-type easy card Blocking; vortex and Doppler type of sticky oil
[0003] The application number is 201210070213.2 "Non-immersed downhole optical fiber flow monitoring system" has disadvantages: 1. The manufacturing process of the sensor module is relatively complicated, especially the 105m length of optical fiber winding, and according to the pipe wall vibration test theory, the monitoring position is approximately one point, but the sensing unit is designed to have a width of 5cm, and the number of layers is 3 layers, not a cross-sectional point
2. The high accuracy of the flow test requires a long sensing fiber, but according to the test principle, its length cannot be too long, so the minimum range of energy flow is limited, and the minimum flow during the experiment is 10m3 / h
3. When completing the simultaneous test of multiple flow fields, because the same wavelength laser source is used, the signals between the sensor modules are susceptible to mutual interference

Method used

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  • Liquid flow non-immersive measuring device and sensing probe
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  • Liquid flow non-immersive measuring device and sensing probe

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Embodiment 1 Firstly, a phase-shifted fiber grating with asymmetrical and π-phase shift is produced by using the mask moving method, and its structure is schematically shown as figure 1 shown. It is a special fiber grating written on photosensitive optical fiber doped (such as erbium, thulium, ytterbium, praseodymium, etc.) by ultraviolet light. When setting the value, control the relative movement between the phase mask and the optical fiber along the fiber axis (usually moving the mask) and then continue to expose for a certain length, so that due to the change of the position of the phase mask, the two The segmented grating produces a phase jump at the connection position to form a phase-shifted fiber grating. This method is called the phase mask moving method. This method can accurately control the relative movement distance between the phase mask and the optical fiber. Controlled at π, the phase jump position is controlled to deviate from the middle position of t...

Embodiment 2

[0067] The difference between the second embodiment and the first embodiment is as Figure 6 As shown, an asymmetric phase-shifting fiber grating 1 is fixed on a leg 5 on a stainless steel oil pipe 2 to form a sensing probe. The section of asymmetrical phase-shift fiber grating 1 circumferentially fixed on the outer wall of the stainless steel oil pipe 2 means that two legs 5 are arranged circumferentially on the outer wall of the stainless steel oil pipe 2, and the plane where the two legs 5 are located is perpendicular to the oil pipe 2 The axis, the distance between the legs 5 is 6cm; the asymmetric phase-shift fiber grating 1 metallized at both ends is welded on the two legs 5, and the asymmetric phase-shift fiber grating 1 is kept in a horizontal and straight state . Phase-shifted fiber grating 1 has stable optical power in the horizontal state, lower noise, and higher test accuracy. The experimental data are as follows: Figure 8 As shown, the two straight lines in the...

Embodiment 3

[0068] The difference between the third embodiment and the first embodiment is as Figure 7 As shown, phase-shifting fiber gratings with different wavelengths are used as sensors to form a sensor array, and the flow monitoring is completed by using wavelength division multiplexing and time-division sampling technology. Since phase-shifted fiber gratings with different wavelengths are used as sensing probes, there is no mutual interference, and the test accuracy will not be reduced due to multiplexing. The experimental data using sensor arrays are as follows: Figure 9 As shown, the basic data accuracy is the same as Figure 7 Basically consistent, no reduction due to multiplexing was found.

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Abstract

The invention discloses a liquid flow non-immersive measuring device and a sensing probe. The liquid flow non-immersive measuring device comprises the sensing probe and is characterized in that the sensing probe is connected with a circulator through an optical path, light emitted by a pump light source of 980nm is received by the circulator through a separator, optical signals output by the circulator is sent to a coupler through the separator, two optical signals are output by the coupler, one signal is sent to a first Faraday rotary mirror through a phase modulator, and the other signal is directly sent to a second Faraday rotary mirror; the optical signals output by the coupler are sent to a photoelectric detector, electric signals output by the photoelectric detector enter a phase carrier wave demodulating device, weak dynamic variation of the wave length of a DFB optical fiber laser is demodulated, and flow is calculated according to the variation of the wave length; the sensing probe relates to a section of asymmetric phase shifting optical fiber grating fixed on the outer wall of an oil pipe in the circumferential direction.

Description

technical field [0001] The invention relates to a flow meter, in particular to a non-immersion measuring device for liquid flow. Background technique [0002] With the continuous progress of oilfield development, flow rate is an extremely important parameter to determine oil production and transmission characteristics. Long-term real-time monitoring of flow rate through advanced technical means can grasp oil well production dynamics, evaluate production layers and analyze oil well downhole technology The situation can provide a scientific basis for optimizing oil and gas production schemes and enhancing crude oil recovery. Due to the complex flow state changes in the oil and gas production process, the gas content of the fluid is low under the downhole high pressure condition, showing a good homogeneous flow characteristic, and there is basically no slippage phenomenon, so the measurement of the downhole flow rate under this condition is relatively It is more beneficial on ...

Claims

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Application Information

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IPC IPC(8): G01F1/66G02B6/02
Inventor 王昌尚盈刘小会宋志强
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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