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A low-permeability oil displacement surfactant and its preparation and product

A technology of surfactants and active agents, which is applied in the field of low-permeability reservoir flooding surfactants and its preparation and products, can solve the problems of low water injection production efficiency, prominent water locking effect, and small pore throat radius in reservoirs. Achieve excellent interfacial tension and oil washing ability, increase the capillary number of displacement fluid, and reduce the effect of oil-water interfacial tension

Active Publication Date: 2019-01-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the particularity and complexity of low-permeability reservoirs, the efficiency of water flooding in such reservoirs is low
In the process of water injection development, due to poor reservoir physical properties, complex pore structure, low porosity, small pore throat radius, high capillary pressure, low matrix permeability and high clay mineral content in low-permeability reservoirs, the reservoir sensitivity is especially Severe water sensitivity and prominent water locking effect, which can easily cause reservoir damage during drilling, completion and development

Method used

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  • A low-permeability oil displacement surfactant and its preparation and product
  • A low-permeability oil displacement surfactant and its preparation and product
  • A low-permeability oil displacement surfactant and its preparation and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Weigh 0.4mol alkanolamide and place it in a flask, add an appropriate amount of methanol solvent, then add 0.05mol sodium hydroxide as a basic catalyst, weigh 0.2mol allyl glycidyl ether, slowly add it dropwise and stir, after the dropwise addition is completed , raise the temperature to 30°C for 1h, then reflux for 8h; then add sulfuric acid to the reaction system to adjust the pH to 3-5, heat to 80°C for 1h, after the hydrolysis is complete, add sodium hydroxide to the reaction system to adjust When the pH is neutral, add 0.2mol sodium acetate, continue heating and stirring at 30°C under alkaline conditions, and react for 3 hours. After the reaction, wash with absolute ethanol, filter, and distill under reduced pressure to obtain GJ-1 agent.

Embodiment 2

[0078] Weigh 0.5 mol alkanolamide and place it in a flask, add an appropriate amount of ethanol solvent, then add 0.05 mol potassium hydroxide, weigh 0.25 mol ethylene glycol glycidyl ether compound, slowly drop and stir, after the drop is completed, Raise the temperature to 40°C and keep it for 1h, then reflux for 2h; then add hydrochloric acid to the reaction system to adjust the pH to 3-5, heat to 80°C for 2h, after the hydrolysis is completed, add potassium hydroxide to the reaction system to adjust When the pH is neutral, add 0.25mol sodium benzoate, continue heating and stirring at 40°C under alkaline conditions, and react for 9 hours. After the reaction, wash with absolute ethanol, filter, and distill under reduced pressure to obtain GJ-2 agent.

Embodiment 3

[0080] Weigh 0.5mol of polyoxyethylene alkyl acyl alcohol amine and place it in a flask, add an appropriate amount of acetone solvent, then add 0.05mol of sodium carbonate, weigh 0.25mol of phenyl glycidyl ether compounds, slowly drop and stir, drop After completion, raise the temperature to 50°C for 1 hour, then reflux for 7 hours; add acetic acid to the reaction system to adjust the pH to 3-5, heat to 80°C for 3 hours, and then add sodium carbonate to the reaction system after hydrolysis is complete. Adjust the pH to neutral, add 0.25mol sodium chloroacetate, continue heating and stirring at 50°C under alkaline conditions, and react for 4 hours. After the reaction is completed, wash with absolute ethanol, filter, and distill under reduced pressure to obtain GJ-3 agent .

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Abstract

The invention provides a low-permeability reservoir oil-displacement surfactant as well as a preparation method and a product thereof. The preparation method comprises the following steps: in the presence of a basic catalyst with a non-ionic surfactant, carrying out a reaction between a non-ionic surfactant and a glycidyl ether compound which serve as raw materials by taking an organic solvent as a reaction solvent, so as to obtain a reaction solution; hydrolyzing the reaction solution in the presence of a pH adjuster; carrying out a reaction between the hydrolyzed product and a metal-organic compound under an alkaline condition, so as to obtain the low-permeability reservoir oil-displacement surfactant, wherein the molar ratio of the non-ionic surfactant to the glycidyl ether compound to the metal-organic compound to the basic catalyst to the pH adjuster is 8:4:4:1:2. The low-permeability reservoir oil-displacement surfactant provided by the invention can be used independently or in combination with other surfactants, has an anti-swelling effect while reducing oil-water interfacial tension and changing wettability, can increase the number of displacement fluid capillary tubes, and reduce the injection pressure, and has a good prospect in improving the water flooding effect and improving the oil recovery of low-permeability reservoirs.

Description

technical field [0001] The invention belongs to the field of oilfield chemical production, and in particular relates to a low-permeability oil flooding surfactant and its preparation and product. Background technique [0002] my country's onshore low-permeability oil fields are widely distributed in more than 20 oil regions across the country. Since the 1990s, many low-permeability oil reservoirs have been discovered in major oil fields such as Daqing, Jilin, Liaohe, Shengli, and Changqing. According to statistics, among the proven undeveloped petroleum geological reserves in recent years, the reserves of low-permeability reservoirs account for 58%, and among the proven petroleum geological reserves, the proportion of low-permeability reservoirs is as high as 60%. ~70%. Low-permeability reservoirs are the main resource base for increasing reserves and production in my country for a long time to come. [0003] Due to the particularity and complexity of low-permeability rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 郭继香高鲜花卓苗
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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