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Emulsified crude oil emulsion laser co-focussing analytical method

A laser confocal and analysis method technology, applied in the field of emulsified crude oil analysis, can solve problems affecting image clarity and resolution, reduce signal-to-noise ratio, etc., and achieve the effect of small divergence, high brightness, and strong directionality

Active Publication Date: 2009-07-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many analysis methods for emulsified crude oil, among which ordinary optical microscope analysis is commonly used. The ordinary optical microscope uses a field light source. Due to the effect of light scattering, the image of each point on the specimen will be affected by the diffracted light or scattered light of adjacent points. Interference, so that what is observed is a phase interference image, thereby reducing the signal-to-noise ratio and affecting the clarity and resolution of the image

Method used

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  • Emulsified crude oil emulsion laser co-focussing analytical method
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  • Emulsified crude oil emulsion laser co-focussing analytical method

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Effect test

Embodiment 1

[0034] 1. Take a few drops of relatively stable emulsion and add it to the groove of the slide glass. The size of the slide glass is 7.5×2.5×0.5cm, the radius of the groove circle is 0.75cm, and the depth is 0.25cm. Then cover it with a cover glass. The size of the cover glass is 1.7×1.7cm, and it is sealed with 502 glue, placed in an incubator, and kept at a temperature of 25 degrees for 24 hours. After the temperature is kept constant until the shape of the droplet is regular, it can be observed with a microscope.

[0035] 2. Use a laser scanning confocal microscope to observe the sample in step 1: select a wavelength of 514nm as the excitation light source, Figure 1 is the observed image reconstructed by software, and part C in Figure 1 is the light emission band 650nm-750nm oil Fluorescence image; part B is the fluorescence image of oil in the luminescence band 550nm-650nm, represented in red; part A is the fluorescence image of water in the luminescence band <550nm, repres...

Embodiment 2

[0049] 1. Take a few drops of relatively stable emulsion and add it to the groove of the slide glass. The size of the slide glass is 7.5×2.5×0.5cm, the radius of the groove circle is 0.75cm, and the depth is 0.25cm. Then cover it with a cover glass. The size of the cover glass is 1.7×1.7cm, and it is sealed with 502 glue, placed in an incubator, and kept at a temperature of 25 degrees for 24 hours. After the temperature is kept constant until the shape of the droplet is regular, it can be observed with a microscope.

[0050] 2. Observing the sample with a laser scanning confocal microscope: observe the oil, select a laser with a wavelength of 514nm as the excitation light source, and select a wavelength of 550-650nm as the receiving wavelength for observation. To observe the form of water, select the wavelength of 514nm as the excitation light source, and select the wavelength of 400-480nm as the receiving wavelength for observation. Observation Results The images reconstructe...

Embodiment 3

[0064] 1. Take a few drops of relatively stable emulsion and add it to the groove of the slide glass. The size of the slide glass is 7.5×2.5×0.5cm, the radius of the groove circle is 0.75cm, and the depth is 0.25cm. Then cover it with a cover glass. The size of the cover glass is 1.7×1.7cm, and it is sealed with 502 glue, placed in an incubator, and kept at a temperature of 25 degrees for 24 hours. After the temperature is kept constant until the shape of the droplet is regular, it can be observed with a microscope.

[0065] 2. Use a laser scanning confocal microscope to observe the sample: choose a laser with a wavelength of 514nm as the excitation light source. Figure 1 is the observed image reconstructed by software, and part C in Figure 1 is the fluorescence of oil in the luminescence band 650nm-750nm The image is shown in blue; part B is the fluorescence image of oil in the luminescence band 550nm-650nm, which is shown in red; part A is the fluorescence image of water in t...

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Abstract

The invention relates to a laser confocal analysis method of emulsified crude oil emulsion. The analysis method comprises the following steps: (1) field sample preparation: a plurality of the emulsion drops are dripped to a groove of a glass slide, the groove is covered with cover glass, sealed with 502 adhesive and placed in a thermotank, and constant temperature is maintained until the shapes of the emulsion drops are regular, then the regular emulsion drops can be observed by a microscope; (2) sample observation: laser 3D scanning is performed on an oil sample by a laser scanning confocal microscope; (3) judgment of emulsified oil type: the type of the emulsified oil is judged according to scan image morphology, and the types include water-in-oil type, oil-in-water type and oil-water-in-oil type; and (4) granularmetric analysis of emulsified oil: representative fields of view are selected without repetition, and the number of inner phase emulsion liquid droplets in one field of view is generally and properly 30-50. In the analysis method, laser is taken as light source, thus non-destructive detection and analysis can be performed on the emulsified crude oil, and analysis results is accurate and have high precision.

Description

Technical field: [0001] The invention relates to an analysis method of emulsified crude oil in the field of oil recovery and development, in particular to a laser confocal analysis method of emulsified crude oil. Background technique: [0002] With the popularization and popularization of ASP flooding technology in oil fields, the research on the crude oil emulsification phenomenon that affects the oil recovery is getting more and more in-depth. There are also many analysis methods for emulsified crude oil, among which ordinary optical microscope analysis is commonly used. The ordinary optical microscope uses a field light source. Due to the effect of light scattering, the image of each point on the specimen will be affected by the diffracted light or scattered light of adjacent points. Interference, so that what is observed is a phase interference image, thereby reducing the signal-to-noise ratio and affecting the clarity and resolution of the image. Invention content: ...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N21/64
Inventor 孙先达王成张民志周浩陆会民
Owner PETROCHINA CO LTD
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