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Viscoelastic Surfactant System and Its Application in Waterflooding Heavy Oil Reservoir Production

A surfactant and viscoelastic technology, which is applied in the field of oil exploitation to achieve the effects of improving oil recovery, reducing mobility ratio and reducing viscous force

Active Publication Date: 2021-09-28
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the process of heavy oil production, how to reduce the viscosity of heavy oil is one of the key issues, and the existing reports on viscoelastic surfactants rarely pay attention to this issue

Method used

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  • Viscoelastic Surfactant System and Its Application in Waterflooding Heavy Oil Reservoir Production
  • Viscoelastic Surfactant System and Its Application in Waterflooding Heavy Oil Reservoir Production
  • Viscoelastic Surfactant System and Its Application in Waterflooding Heavy Oil Reservoir Production

Examples

Experimental program
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Effect test

preparation example Construction

[0030] (2) Preparation of dimer quaternary ammonium salt surfactant: get intermediate 1.6g (6.0mmol), 1-bromododecane 6.0g (24.0mmol) (the number of carbon atoms n of the alkyl chain R of compound A is For other values, when X is other options, select the corresponding raw material to replace 1-bromododecane) Dissolve in methanol / acetone mixed solvent, react at 40°C for 72h. The solvent was removed by rotary evaporation, and the crude product was recrystallized in methanol / ethyl acetate to obtain a powdery product, Compound A.

[0031] Specifically, the preparation method of compound B (the carbon number n of the alkyl chain R is 12, and X is Br) is as follows:

[0032] (1) Synthesis of intermediate tripolyamide: 10.6 g (120.0 mmol) of N,N-dimethylethylenediamine was added to 2.3 g (10.0 mmol) of trimethyl citrate, and refluxed at 106° C. for 3 h. After the reaction, use a rotary evaporator to remove excess N,N-dimethylethylenediamine to obtain the intermediate;

[0033] (2)...

Embodiment

[0035] Example Preparation of viscoelastic surfactant system

[0036] Under normal temperature (15-30°C) and mechanical stirring at a speed of 200-400rpm, add the oligomeric cationic quaternary ammonium salt surfactant and small molecule additives to the water whose water volume is 1 / 3-2 / 3 of the total amount, Stir for 30-100 minutes until fully dissolved; then add anionic non-ionic surfactant and the rest of water, stir for 1-5 hours at room temperature and 1000-4000 rpm until completely mixed, and prepare a viscoelastic surfactant system. The water in the preparation process is all selected mineralized water, and the degree of salinity is 20000mg / L.

[0037] According to the above method, select three kinds of oligomeric cationic surfactant Malic-2C respectively 12 、Citric-3C 12 and EDTA-4C 12 Anion nonionic surfactant is selected alkyl alcohol polyoxyethylene ether ammonium sulfate (DNS-18); with ethanol-diethanolamine mixed solvent (the two each account for 0.5% of the ...

Embodiment 4

[0061] Embodiment 4 prepares viscoelastic surfactant system

[0062] The components are composed of: 0.05% of compound A (the carbon number n of the alkyl chain R is 4, and X is Cl), 0.1% of alkyl alcohol polyoxyethylene ether ammonium sulfate (DNS-18), 1% of methanol, and the balance is water.

[0063] Preparation method: Add oligomeric cationic quaternary ammonium salt surfactant and small molecule additives into appropriate amount of water under normal temperature and mechanical stirring at 200-400rpm, and stir until fully dissolved; then add anionic nonionic surfactant and other Amount of water, stirred until completely mixed, to prepare a viscoelastic surfactant system. The water in the preparation process is mineralized water, with a salinity of 20000mg / L.

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Abstract

The invention discloses a viscoelastic surfactant system, which is composed of a cationic oligomeric surfactant, an anionic nonionic surfactant, a small molecule additive and water, and the cationic oligomeric surfactant accounts for 0.01% to 1%. Anionic and nonionic surfactants account for 0.05% to 3%, and small molecule additives account for 0.02% to 5%. The anionic nonionic surfactant is selected from alkylphenol polyoxyethylene ether sulfonate and alkyl alcohol polyoxyethylene ether sulfonate. The application of the viscoelastic surfactant system of the present invention in the production of water flooding heavy oil reservoirs. The viscoelastic surfactant system of the present invention has dual functions of regulating and driving and reducing viscosity, can effectively reduce the viscosity of heavy oil, and greatly reduce the viscous force of heavy oil in rock voids; at the same time, it can also increase the viscosity of the water phase, Reducing the mobility ratio and increasing the swept volume can effectively improve the efficiency of water flooding; it can also reduce the oil-water interfacial tension to an ultra-low range, thereby effectively improving the recovery of heavy oil in water flooding.

Description

technical field [0001] The invention relates to a viscoelastic surfactant system, in particular to a viscoelastic surfactant system containing a specific oligomeric cationic quaternary ammonium salt surfactant, and the use of the viscoelastic surfactant system in water flooding heavy oil reservoirs The application in mining technology belongs to the field of oil mining technology. Background technique [0002] In the development process of heavy oil reservoirs, for the heavy oil reservoirs whose underground crude oil viscosity is higher than 2000mPa·s, they can be effectively developed by means of steam thermal recovery. However, for heavy oil reservoirs with underground crude oil viscosity values ​​between 150 and 2000 mPa·s, due to their better underground fluidity, the water flooding heavy oil method is usually preferred for development. Compared with steam thermal recovery technology, the cost of water flooding heavy oil is lower and the economic benefit is better, so t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/30
Inventor 张宗檩秦冰石静乔富林曹绪龙江建林祝仰文高敏于群王红艳
Owner CHINA PETROLEUM & CHEM CORP
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