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: 2015-06-10
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
  • Liquid flow non-immersive measuring device and sensing probe
  • Liquid flow non-immersive measuring device and sensing probe

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Embodiment 1 First, a phase-shifted fiber grating with asymmetric and π phase shift is fabricated by using the mask moving method, and its structure is as follows figure 1 shown. It is a special fiber grating inscribed on the photosensitive fiber doped with ultraviolet light (such as erbium, thulium, ytterbium, praseodymium, etc.) When setting the value, control the relative movement of the phase mask and the optical fiber along the axis of the optical fiber (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 produced before and after the mask are changed. The segment grating produces a phase jump at the connection position to form a phase-shift fiber grating. This method is called the phase mask moving method. This method can accurately control the relative movement distance of the phase mask and the fiber to make the phase shift accurate. Controlled at π, the position of the...

Embodiment 2

[0067] The difference between the second embodiment and the first embodiment is as follows Image 6 As shown, the asymmetric phase-shift fiber grating 1 is fixed on the legs 5 on the stainless steel tubing 2 to form a sensing probe. The 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 on the outer wall of the stainless steel oil pipe 2 in the circumferential direction, and the plane where the two legs 5 are located is perpendicular to the oil pipe 2. 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 horizontally straight state. . The phase-shift fiber grating 1 has stable output power, lower noise and higher test accuracy in the horizontal state. The experimental data are as follows: Figure 8 As shown in the figure, the two strai...

Embodiment 3

[0068] The difference between the third embodiment and the first embodiment is as follows: Figure 7 As shown, phase-shifted fiber gratings with different wavelengths are used as sensors to form a sensor array, and the monitoring of flow 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 precision is the same as Figure 7 Basically consistent, no decrease was found due to multiplexing.

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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 flowmeter, 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 the characteristics of oil production and transmission. Long-term real-time monitoring of flow rate through advanced technical means can master the production performance of oil wells, evaluate production layers and analyze downhole technology of oil wells. It can provide a scientific basis for optimizing the oil and gas exploitation plan and improving the crude oil recovery rate. Due to the complex flow state changes in the production process of oil and gas, the gas content of the fluid is low under the condition of downhole high pressure, showing good homogeneous flow characteristics, and there is basically no slippage phenomenon, so the measurement of downhole flow under this condition is more More favora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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