Preparation method and application of fluorescein derivative serving as tracer agent for oil field

A technology of fluorescein and tracer, which is applied in the field of preparation of fluorescein derivatives of tracers used in oil fields, and can solve the problems of large adsorption consumption and weak water solubility of formations

Active Publication Date: 2014-02-05
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because fluorescein itself has hydroxyl, carboxyl and other functional groups for forming hydrogen bonds and aromatic ring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1

[0015] The preparation method of the fluorescein derivative of the tracer for oil field includes the following steps:

[0016] In the first step, fluorescein is added to the reaction kettle, and a solvent of 10 times the mass of fluorescein is added to dissolve, and the solvent is tap water;

[0017] In the second step, an alkali with a ratio of 1:1 to the fluorescein substance is added to the reaction kettle under stirring, and the alkali is industrial-grade sodium hydroxide;

[0018] In the third step, add formaldehyde-containing compound and 1:1 sulfite with a ratio of 1:1 to the fluorescein substance into the reaction kettle under stirring, and reflux for 4 hours. The concentration of the formaldehyde-containing compound is 35% industrial grade formaldehyde aqueous solution, sulfite is industrial grade sodium sulfite;

[0019] The fourth step is to cool the reaction kettle to room temperature, evaporate the solvent, add salt of twice the mass of the obtained mate...

Example Embodiment

[0021] Example 2

[0022] The preparation method of the fluorescein derivative of the tracer for oil field includes the following steps:

[0023] In the first step, fluorescein is added to the reaction kettle, and a solvent of 15 times the mass of fluorescein is added to dissolve, and the solvent is industrial grade anhydrous methanol;

[0024] In the second step, an alkali with a ratio of 1:1.5 to the amount of fluorescein substance is added to the reaction kettle under stirring, and the alkali is industrial-grade potassium hydroxide;

[0025] In the third step, add formaldehyde-containing compound and 1:1 sulfite with a ratio of 1:1.2 to the fluorescein substance into the reaction kettle under stirring, and reflux for 5 hours. The formaldehyde-containing compound is industrial grade Paraformaldehyde and sulfite are industrial grade potassium sulfite;

[0026] The fourth step is to cool the reactor to room temperature, evaporate the solvent, add salt of 5 times the mass of the obtaine...

Example Embodiment

[0028] Example 3

[0029] The preparation method of the fluorescein derivative of the tracer for oil field includes the following steps:

[0030] In the first step, fluorescein is added to the reaction kettle, and 20 times the mass of fluorescein is added to dissolve the solvent, and the solvent is industrial grade absolute ethanol;

[0031] In the second step, a base with a ratio of 1:2 to the amount of fluorescein substance is added to the reaction kettle under stirring, and the base is industrial-grade lithium hydroxide;

[0032] In the third step, add formaldehyde-containing compounds and 1:1.5 sulfites with a ratio of 1:1.5 to the fluorescein substance into the reactor under stirring, and reflux for 3 hours. The formaldehyde-containing compounds are chemically pure Trioxane and sulfite are industrial grade ammonium sulfite;

[0033] The fourth step is to cool the reaction kettle to room temperature, evaporate the solvent, add 8 times the mass of the obtained material salt, mix and...

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PUM

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Abstract

The invention relates to a preparation method and application of a fluorescein derivative serving as a tracer agent for an oil field. The preparation method comprises steps of firstly adding fluorescein into a reaction kettle; adding a solvent and dissolving the fluorescein; adding an alkali while stirring; then adding a compound containing formaldehyde and sulfite, wherein the mass ratio of the compound containing formaldehyde to the fluorescein is (1-4):1, and the mass ratio of sulfite to the fluorescein is (1-3):1; raising temperature and refluxing; cooling the reaction kettle to room temperature; evaporating the solvent; adding a salt and mixing and grinding to obtain the fluorescein derivative serving as the tracer agent for the oil field. When in use, the fluorescein derivative is prepared into solution and is injected into a well to be tested, and water samples are collected for quantitative analysis till the fluorescein derivative is not detected in the collected water samples; after being treated, the fluorescein is added with sulphur methyl, so that the water solubility of the fluorescein is improved, and the solubility of the fluorescein in crude oil is lowered; sulphur methyl is a completely ionized group and has strong electronegativity, and generates strong electrostatic repulsion with negative charges of hydrated rock marks in stratum, so that the adsorption consumption of the fluorescein in the stratum is greatly reduced, and the dosage of the fluorescein serving as the tracer agent is reduced.

Description

technical field [0001] The invention relates to the technical field of fluorescein derivatives of tracers used in oil fields, in particular to a preparation method and application of fluorescein derivatives of tracers used in oil fields. Background technique [0002] Oilfield water injection tracer technology is one of the on-site production test technologies. Its technology is to inject tracer from the injection well, and then take samples from the surrounding production wells according to certain sampling regulations, and monitor the change of the tracer over time, which can guide The design of oil well production and the adjustment in the late stage of oil field development. Due to the limitation of the reservoir environment, the tracer must meet the three requirements of chemical stability, physical stability and biological stability. For a long time, the most commonly used tracers in oilfield development mainly include chemical tracers and isotope tracers. Although th...

Claims

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Application Information

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IPC IPC(8): C07D493/10E21B47/11G01V15/00
CPCC07D493/10E21B47/11
Inventor 顾雪凡陈刚李科马新培尤丽丝·买买提
Owner XI'AN PETROLEUM UNIVERSITY
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