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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 rings that are easily soluble in crude oil, it has the disadvantages of high formation adsorption consumption and weak water solubility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a fluorescein derivative of a tracer for oil fields, comprising the following steps:

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

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

[0018] The third step is to add formaldehyde-containing compounds and 1:1 sulfites with a molar ratio of 1:1 and 1:1 sulfite to the reaction kettle under stirring, and heat up and reflux for 4 hours. The concentration of the formaldehyde-containing compounds is 35% industrial grade formaldehyde solution, the sulfite is industrial grade sodium sulfite;

[0019] The fourth step is to cool the reaction kettle to room temperature, evaporate the solvent, add salt twice the mass of the obtained substance, mix and grind to a size above ...

Embodiment 2

[0022] A method for preparing a fluorescein derivative of a tracer for oil fields, comprising the following steps:

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

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

[0025] The third step is to add formaldehyde-containing compounds and 1:1 sulfite in the ratio of 1:1.2 and 1:1 sulfite to the reaction kettle under stirring, and heat up and reflux for 5 hours. The formaldehyde-containing compounds are industrial grade Paraformaldehyde, sulfite is technical grade potassium sulfite;

[0026] The fourth step is to cool the reaction kettle to room temperature, evaporate the solvent, add salt with 5 times the mass of the obtained substance, mix and grind ...

Embodiment 3

[0029] A method for preparing a fluorescein derivative of a tracer for oil fields, comprising the following steps:

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

[0031] In the second step, under stirring, add an alkali with a molar ratio of 1:2 to the fluorescein substance into the reaction kettle, and the alkali is industrial grade lithium hydroxide;

[0032] The third step is to add formaldehyde-containing compounds with a molar ratio of 1:1.5 and 1:1.5 sulfite to the reaction kettle under stirring, and heat up and reflux for 3 hours. The formaldehyde-containing compounds are chemically pure Paraformaldehyde, sulfite is industrial grade ammonium sulfite;

[0033] The fourth step is to cool the reaction kettle to room temperature, evaporate the solvent, add salt with 8 times the mass of the obtained substance, mix and grind to more than 4...

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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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