Preparation method of low-solubility phenolic resin for oilfield enhanced oil recovery

A low-solubility, phenolic resin technology, which is applied in the field of preparation of low-solubility phenolic resins for enhanced oil recovery in oil fields, can solve the problems of good water solubility of products, difficulty in forming molecular aggregates, and reduction of solid content of products, etc., to achieve high effective content , good storage stability, the effect of promoting addition reaction

Active Publication Date: 2021-06-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

These two methods will prolong the storage stability of the product, but if the reaction time is shortened, the water solubility of the product will be too good, and it will not be easy to form molecular aggregates in the reinjection water of the oil field. If diluted with water, the solid content of the product will be reduced

Method used

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  • Preparation method of low-solubility phenolic resin for oilfield enhanced oil recovery

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Experimental program
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Effect test

Embodiment 1

[0018] Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxide, deionized water.

[0019] Firstly, phenol is sealed and melted at 50°C. After the phenol is completely melted, add 47g of phenol into a 500ml four-necked bottle, and then add 15g of sodium hydroxide solution (mass fraction 20%) into the four-necked bottle. Install an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel into the four-necked bottle and heat it in a water bath to keep the temperature in the bottle at 70-80°C. Add 81g of formaldehyde dropwise to the four-necked bottle, stir and control the drop rate of formaldehyde, and react for 30-40 minutes. Adjust the temperature of the water bath so that the temperature of the reactants in the bottle is 90°C. After 120 minutes of reaction, add 27g of water and 7.5g of NaOH (mass fraction 40%) to make the effective content of low-solubility phenolic resin reach 40%, and continue the reaction for 30-40 minut...

Embodiment 2

[0021] Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxide, deionized water.

[0022] Firstly, phenol is sealed and melted at 50°C. After the phenol is completely melted, add 47g of phenol into a 500ml four-necked bottle, and then add 15g of sodium hydroxide solution (mass fraction 20%) into the four-necked bottle. Install an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel into the four-necked bottle and heat it in a water bath to keep the temperature in the bottle at 70-80°C. Add 81g of formaldehyde dropwise to the four-necked bottle, stir and control the drop rate of formaldehyde, and react for 30-40 minutes. Adjust the temperature of the water bath so that the temperature of the reactants in the bottle is 90°C. After 120 minutes of reaction, add 34.5g of water to make the effective content of the low-solubility phenolic resin reach 40%, and continue the reaction for 30-40 minutes; add 42.5g of water again to...

Embodiment 3

[0024] Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxide, deionized water.

[0025] Firstly, phenol is sealed and melted at 50°C. After the phenol is completely melted, add 47g of phenol into a 500ml four-necked bottle, and then add 15g of sodium hydroxide solution (mass fraction 20%) into the four-necked bottle. Install an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel into the four-necked bottle and heat it in a water bath to keep the temperature in the bottle at 70-80°C. Add 81g of formaldehyde dropwise to the four-necked bottle, stir and control the drop rate of formaldehyde, and react for 30-40 minutes. Adjust the temperature of the water bath so that the temperature of the reactants in the bottle is 90°C. After 120 minutes of reaction, add 34.5g of water to make the effective content of the low-solubility phenolic resin reach 40%, and continue the reaction for 30-40 minutes; add 35g of water and 7.5g o...

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Abstract

The preparation method of low-solubility phenolic resin for enhanced oil recovery in oil fields, the weight ratio of phenol and formaldehyde is 1:1.72~2.58, and the amount of catalyst sodium hydroxide is 2% based on the weight of reactant phenolic formaldehyde. It is prepared by condensation reaction with phenol and formaldehyde as raw materials. The polycondensation reaction is divided into three stages, and a 40% alkali metal hydroxide aqueous solution is added in each stage. The alkali metal hydroxide is sodium hydroxide.

Description

technical field [0001] The invention relates to a preparation technology of a low-solubility phenolic resin, in particular to a preparation method of a low-solubility phenolic resin for oil field enhanced recovery. Background technique [0002] The traditional water-soluble phenolic resins used in oil field control and displacement agents belong to thermosetting resole phenolic resins. The degree of polymerization of the generated molecules is small, the average relative molecular weight is low, and it is soluble in water at room temperature. The combined reaction generates gels, which play the role of profile control and water plugging. Moreover, because the water-soluble phenolic resin molecule contains a highly reactive methylol functional group, it can spontaneously undergo polycondensation reaction to generate an infusible and insoluble body-shaped resin after being placed for a long time at room temperature, and its storage stability is poor. For some oil fields, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10
CPCC08G8/10
Inventor 赵丹
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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