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Viscoelastic betaine surfactant as well as preparation method and application thereof

A technology of surfactant and betaine, which is applied in the field of viscoelastic betaine surfactant and its preparation and application, can solve the problems of low viscosity or interfacial activity, low oil displacement efficiency, formation plugging, etc., and achieve high interfacial activity, Improve oil displacement efficiency and increase surface activity

Inactive Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the polymer in the existing chemical flooding is used in the oil displacement process of the low-permeability reservoir, which is easy to cause formation blockage and difficult injection, and the existing surfactant system contains alkali, and the viscosity or interfacial activity is low , the problem of low oil displacement efficiency, to provide a new composition of viscoelastic betaine surfactant, the surfactant has the characteristics of high oil displacement efficiency under high temperature and low permeability conditions, especially suitable for sand seven in Jiangsu oilfield oilfield

Method used

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  • Viscoelastic betaine surfactant as well as preparation method and application thereof
  • Viscoelastic betaine surfactant as well as preparation method and application thereof
  • Viscoelastic betaine surfactant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Surfactant Preparation

[0030] (1) Erucamide sultaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 3 h 6 O, R 4 and R 5 =C 1 )preparation

[0031] a) Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 140°C for 8 hours, turn on the vacuum pump, and remove the methanol and Excess N,N-dimethylpropylenediamine to obtain erucic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate, react at 75°C for 9 hours, and use absolute ethanol After recrystallization and purification, long carbon chain betaine surfactant is obtained; wherein, methyl erucate: N, N-dimethylpropylenediamine: the molar ratio of 3-chloro-2-hydroxypropanesulfonate sodium is 1:2.5 :1.5.

[0032] b) Naphthalene sulfonate and the erucamide sulfobetaine surfactant prepared by the present invention are respectively dissolved in water, stirred for 30 minutes, and for...

Embodiment 2

[0041] 1. Surfactant Preparation

[0042] (1) triacic acid amide sulfobetaine surfactant (R 1 =C 29 , R 2 =C 2 , R 3 =C 2 , R 4 and R 5 =C 1 )preparation

[0043] a) Add 0.5 mole of long-chain triacic acid methyl ester and the required amount of amidating reagent N,N-dimethylethylenediamine into the reaction kettle, react at 130°C for 6 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylethylenediamine to obtain triacyl tertiary amine product, then add the required amount of sodium 2-chloroethylsulfonate, and react at 85°C for 15 hours. Obtain the long carbon chain betaine surfactant after water ethanol recrystallization purification; Wherein, the molar ratio of triacic acid methyl ester:N,N-dimethylethylenediamine:2-chloroethylsulfonate sodium is 1:2 :1.6.

[0044] b) Naphthalene sulfonate and triacic acid amide sulfobetaine surfactant prepared by the present invention are respectively dissolved in water, stirred for ...

Embodiment 3

[0048] 1. Surfactant Preparation

[0049] (1) nonanoic acid amide sultaine surfactant (R 1 =C 8 , R 2 =C 3 , R 3 =C 3 h 6 O, R 4 and R 5 =C 1 )preparation

[0050] a) Add 0.5 mole of nonanoic acid methyl ester and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 135°C for 10 hours, turn on the vacuum pump, and remove the methanol and Excessive N,N-dimethylpropylenediamine, to obtain nonanoic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate sodium, react at 75 ° C for 10 hours, wash with absolute ethanol After recrystallization and purification, the long carbon chain betaine surfactant is obtained; wherein, the molar ratio of methyl nonanoate:N,N-dimethylpropylenediamine:3-chloro-2-hydroxypropanesulfonate sodium is 1:2 :1.5.

[0051] b) Naphthalene sulfonate and the nonanoic acid amide sulfobetaine surfactant prepared by the present invention were dissolved in...

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Abstract

The invention relates to a preparation method and an application of a viscoelastic betaine surfactant in low-permeability reservoirs and mainly solves the problem that existing oil displacement systems have poor oil displacement effects under the low-permeability reservoir condition. Viscoelastic betaine surfactant composition is prepared from a betaine surfactant and an anionic surfactant in themolar ratio being (1:0.01)-(1:100); the betaine surfactant is selected from at least one of structures shown in formula (I), R1 is selected from C8-C29 alkyls and alkenyls, R2 and R3 are independentlyselected from C1-C5 alkylenes or hydroxyl substituted alkylenes, and R4 and R5 are independently selected from C1-C4 alkyl; the anionic surfactant is selected from structures shown in formula (II). With the adoption of the technical scheme, the problem is better solved, and the viscoelastic betaine surfactant can be applied to tertiary oil recovery of oil fields.

Description

technical field [0001] The invention relates to a preparation method and application of a viscoelastic betaine surfactant in low-permeability oil reservoirs. Background technique [0002] Among Sinopec's newly proven petroleum geological reserves, low-permeability reservoirs account for as high as 60% to 70%. Low-permeability reservoirs will be the main resource base for increasing reserves and production for a long period of time in the future. Due to the characteristics of low permeability reservoirs such as low permeability and small porosity, the water absorption capacity of the reservoir is low, and the clay minerals in the oil layer expand with water and the water quality of the injected water is not compatible with the oil layer. The oil layer damage, water injection pressure Continuously rising, resulting in the formation of high-pressure areas near water injection wells. At the same time, long-term high-pressure water injection can easily lead to casing damage. Unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 王辉辉沈之芹余晓玲虞辰敏
Owner CHINA PETROLEUM & CHEM CORP
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