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Viscoelastic surfactant system based on oligomerization agent and application thereof

A surfactant and viscoelastic technology, applied in the field of oil exploration, can solve problems such as easy blockage of pores, reduce viscosity of heavy oil, and irregular oil-water front, so as to improve water flooding efficiency, increase water phase viscosity, and increase sweep volume effect

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty of water flooding heavy oil technology is that the viscosity of formation heavy oil is much higher than that of injected water, resulting in irregular oil-water fronts, viscous fingering and water channeling, which greatly reduce the recovery of water flooding heavy oil
At the same time, reservoir heterogeneity further exacerbates the difficulty of water flooding heavy oil production.
Affected by reservoir heterogeneity, the higher the crude oil viscosity, the larger the permeability gradient and the lower the displacement efficiency
[0003] Traditional polymer flooding can increase the viscosity of the water phase to reduce viscous fingering and water channeling, but the polymer has no viscosity-reducing function and is easy to block pore throats, which makes it only suitable for low-viscosity oil reservoirs
Although viscosity reducer flooding can reduce the viscosity of heavy oil, its high mobility ratio to heavy oil is prone to viscous fingering and becomes ineffective water flooding.
Binary flooding and ASP flooding are prone to chromatographic separation, and the production degree of deep heavy oil is low
[0006] In addition, in the process of heavy oil production, how to reduce the viscosity of heavy oil is one of the key issues, but the existing reports on viscoelastic surfactants rarely pay attention to this issue

Method used

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  • Viscoelastic surfactant system based on oligomerization agent and application thereof
  • Viscoelastic surfactant system based on oligomerization agent and application thereof
  • Viscoelastic surfactant system based on oligomerization agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0028] Preparation example 1 prepares ethoxylated quaternary ammonium salt type dimeric surfactant C 3 h 6 -2C 12 EO 3

[0029] (1) Add 18.5g (100 mmol) of the weighed raw material dodecylamine into a reaction kettle equipped with a stirring device, heat to 150°C while blowing nitrogen, and add 26.4g (600 mM) of ethylene oxide after 40 minutes. millimole), the temperature is maintained at 150°C, the pressure is controlled <0.80MPa, and the reaction is stirred for 1 hour. After the reaction is completed, the system is purged with nitrogen, and after cooling, it is neutralized and dehydrated to obtain the intermediate dodecyl polyoxyethylene ether tertiary amine 44 g, 98% yield.

[0030] (2) Weigh 22.5 g (50 mmol) of the intermediate dodecyl polyoxyethylene ether tertiary amine and 4 g (20 mmol) of 1,3-dibromopropane. Add the weighed raw materials into a reactor with a reflux and stirring device, add 800 grams of isopropanol, and after 3 days of reflux reaction, stop the re...

preparation example 2

[0032] Preparation example 2 prepares ethoxylated quaternary ammonium salt type trimeric surfactant C 3 h 5 -3C 12 EO 3

[0033] (1) The preparation of the intermediate lauryl polyoxyethylene ether tertiary amine is the same as in Example 1.

[0034] (2) Weigh 22.5 g (50 mmol) of the intermediate dodecyl polyoxyethylene ether tertiary amine and 4.18 g (15 mmol) of 1,2,3-tribromopropane. Add the weighed raw materials into a reactor with a reflux and stirring device, add 800 grams of isopropanol, and after 3 days of reflux reaction, stop the reaction, evaporate the solvent under reduced pressure, and obtain 8.5 grams of pure Product C 3 h 5 -3C 12 EO 3 , 35% yield; its structural formula is as follows:

[0035]

preparation example 3

[0036] Preparation example 3 prepares ethoxylated quaternary ammonium salt type tetrameric surfactant C 5 h 8 -4C 12 EO 3

[0037] (1) The preparation of the intermediate lauryl polyoxyethylene ether tertiary amine is the same as in Example 1.

[0038] (2) Weigh 22.5 grams (50 mmol) of the intermediate dodecyl polyoxyethylene ether tertiary amine and 3.84 grams (10 mmol) of tetrabromopentaerythritol. The weighed raw materials are added to the reactor with reflux and stirring device, 800 grams of isopropanol is added, after reflux reaction for 3 days, the reaction is stopped, the solvent is evaporated under reduced pressure, and after recrystallization, 4.36 grams of pure Product C 5 h 8 -4C 12 EO 3 , yield 20%; Its structural formula is as follows:

[0039]

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Abstract

The invention discloses a viscoelastic surfactant system based on an oligomerization agent. The system is composed of 0.05%-0.5% of an ethoxy quaternary ammonium salt type oligomeric surfactant, 0.03%-0.8% of an anionic and nonionic surfactant and the balance of water. The anionic and nonionic surfactant provided by the invention is selected from alkylphenol polyoxyethylene ether sulfonate or sulfate, and alkyl alcohol polyoxyethylene ether sulfonate or sulfate. The viscoelastic surfactant system disclosed by the invention has double effects of profile control and displacement and viscosity reduction, can effectively reduce the viscosity of thickened oil, and greatly reduces the viscous force of the thickened oil in rock gaps, meanwhile, the water-phase viscosity can be improved, the fluidity ratio is reduced, the swept volume is increased, and therefore the water-drive thickened oil recovery rate is effectively increased.

Description

technical field [0001] The invention relates to a viscoelastic surfactant system, in particular to a viscoelastic surfactant system containing a specific ethoxylated quaternary ammonium salt type oligomeric surfactant, and the viscoelastic surfactant system is used in water flooding The invention relates to an application in oil reservoir exploitation technology, and belongs to the field of oil exploitation technology. Background technique [0002] Water flooding of heavy oil is one of the key technologies for heavy oil recovery. Compared with steam thermal recovery technology, its production cost is lower and its economic benefits are better, so its application prospect is very good. However, the difficulty of water flooding heavy oil technology is that the viscosity of formation heavy oil is much higher than that of injected water, resulting in irregular oil-water fronts, viscous fingering and water channeling, which greatly reduce the recovery efficiency of water flooding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08G65/337C08G65/26
CPCC09K8/584C08G65/337C08G65/2624C09K2208/30
Inventor 孙焕泉秦冰张宗檩乔富林曹绪龙江建林祝仰文高敏石静于群
Owner CHINA PETROLEUM & CHEM CORP
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