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Device and method for measuring fluorescence of crude oil

A technology for fluorescence measurement and crude oil, applied in measuring devices, fluorescence/phosphorescence, material analysis through optical means, etc., can solve the problems of difficult interpretation of optical density measurement and inability to apply downhole

Active Publication Date: 2018-08-17
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

During the collection of heavy oil samples, emulsions are often formed, and the emulsions will produce a large amount of light scattering. At this time, the data obtained by transmission spectroscopy are very inaccurate, making the interpretation of optical density measurements very difficult.
In the laboratory, centrifugation or chemical reagents can be used to demulsify fluids and analyze crude oil components, but this technology cannot be applied downhole

Method used

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  • Device and method for measuring fluorescence of crude oil
  • Device and method for measuring fluorescence of crude oil
  • Device and method for measuring fluorescence of crude oil

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Embodiment 1

[0053] This embodiment combines image 3 , to illustrate the downhole crude oil fluorescence measurement system, including: fluid pipeline 1, sapphire prism 2, oblique incident optical fiber 3, focusing lens 4, vertical incident optical fiber 5, optical fiber beam splitter 6, laser 7, oblique reflection optical fiber 8, reflection quasi- Straight mirror 9, photodetector 10, incident collimating mirror 11, spectrometer 12 and optical filter group 13.

[0054] The working principle of the downhole operation of the fluorescence measurement probe:

[0055] 1. The light source provided by the laser 7 is divided into two beams by the optical fiber beam splitter 6: one beam passes through the vertical incident optical fiber 5, the focusing lens 4 and the sapphire prism 2 and then irradiates the sample 1. When there is crude oil component, it will excite the visible light band Fluorescence signal, the signal enters the spectrometer 12 after being processed by the filter group 13, and...

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Abstract

The invention provides a device and a method for measuring the fluorescence of crude oil, and relates to the technical field of measurement of the fluorescence of crude oil. The device comprises a laser, a vertical incident optical fiber, a prism and a spectrometer, and a laser beam emitted by the laser goes through the vertical incident optical fiber, is incident on the prism, is transmitted by the prism, and finally is irradiated to a sample on a fluid pipeline; and a reflection fluorescence signal excited by the sample goes through the vertical incident optical fiber, and is incident on thespectrometer to form a fluorescence spectrum. The method adopts fluorescence detection to solve the problem of high difficulty in optical density measurement of crude oil containing an emulsion by using transmission spectrum, allows the fluorescence measurement of down-hole crude oil to be not affected by the emulsified state, realizes qualitative oil type interpretation, and is of great significance in the grading analysis of in the heavy oil reservoir components.

Description

technical field [0001] The invention relates to the technical field of crude oil fluorescence measurement, in particular to a crude oil fluorescence measurement device and method. Background technique [0002] Downhole crude oil fluorescence measurement technology can determine the type of crude oil according to the color and brightness of the fluorescence, and can also be applied to detect retrocondensation, and more importantly, it can also classify fluids in downhole emulsions. During the collection of heavy oil samples, emulsions are often formed, and the emulsions will produce a large amount of light scattering. At this time, the data obtained by transmission spectroscopy are very inaccurate, making the interpretation of optical density measurements very difficult. In the laboratory, centrifugation or chemical reagents can be used to demulsify fluids for crude oil component analysis, but this technology cannot be applied downhole. Contents of the invention [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 沈阳冯永仁张小康孔笋薛永增支宏旭王健欧阳帅玉
Owner CHINA NAT OFFSHORE OIL CORP
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