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Method and device for determining asphaltene content by low field nuclear magnetic resonance

A technology of low-field nuclear magnetic resonance and asphaltene content, which is applied in the field of low-field nuclear magnetic resonance to determine asphaltene content, can solve the problems of high cost, long time consumption, and large chemical reagent consumption, and achieve environmental protection, simple operation, and no chemical consumption. The effect of the reagent

Active Publication Date: 2015-12-09
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The present invention provides a method and device for determining asphaltene content by low-field nuclear magnetic resonance in order to solve the problems of large amount of chemical reagent consumption, high cost and long time consumption in obtaining asphaltene content in crude oil by chemical analysis experiment method in the prior art

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  • Method and device for determining asphaltene content by low field nuclear magnetic resonance

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that, in the drawings or description, similar or identical elements all use the same reference signs.

[0024] figure 1 The flowchart of Embodiment 1 of the method for determining asphaltene content by low-field nuclear magnetic resonance of the present invention, such as figure 1 As shown, the method of the present embodiment includes:

[0025] Step 101: Using FID (Free Induction Decay, Free Induction Decay, "FID" for short) pulse sequence to perform low-field nuclear magnetic resonance measurement on the crude oil sample, and obtain the crude oil sample FID signal intensity curve of the crude oil sample.

[0026] Step 102 , according to the preset CPMG echo ...

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Abstract

The invention provides a method and a device for determining the asphaltene content by low field nuclear magnetic resonance. The method comprises the following steps: carrying out low field nuclear magnetic resonance measurement on a crude oil sample by adopting FID (free induction decay) pulse sequence to obtain a crude oil sample FID signal intensity curve of the crude oil sample; carrying out low field nuclear magnetic resonance measurement according to a preset CPMG (Carr-Purcell-Meiboom-Gill) echo interval to obtain a CPMG echo intensity curve of the crude oil sample; analyzing the FID signal intensity curve of the crude oil sample and the CPMG echo intensity curve of the crude oil sample to obtain signal intensity difference data of the crude oil sample; and determining the asphaltene content in the crude oil sample according to the signal intensity difference data of the crude oil sample. Therefore, the method and the device provided by the invention can be used for obtaining the asphaltene content on line and realizing fast and accurate asphaltene content detection which is short in testing period, and free of damage to the crude oil sample and consumption of chemical reagents.

Description

technical field [0001] The invention relates to crude oil component measurement technology, in particular to a method and device for determining asphaltene content by low-field nuclear magnetic resonance. Background technique [0002] Since the discovery of the phenomenon of nuclear magnetic resonance, it has become a very useful analytical testing tool in the fields of physics, chemistry, biology and medicine. [0003] Crude oil is composed of four components: saturated hydrocarbons, aromatic hydrocarbons, gums and asphaltenes. Among them, the content of asphaltenes in crude oil can affect many properties of crude oil, such as hydrogen index, viscosity and so on. Therefore, the determination of asphaltene content in crude oil is of great significance to the entire petroleum industry. [0004] However, at present, chemical analysis methods are usually used to determine the asphaltene content in crude oil components. Although the asphaltene content obtained by chemical anal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 肖立志陈伟梁廖广志贾子健邓峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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