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Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition

A technology of surfactant and composition, which is applied in viscoelastic surfactant composition for oil displacement and its preparation and application field, can solve the problems of stratum and oil well damage, low oil displacement efficiency, etc., achieve high interfacial activity, improve Recovery factor, the effect of simple system

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 surfactants in the prior art have low oil displacement efficiency under the condition of high temperature, medium and low permeability, and at the same time cause huge damage to formations and oil wells due to the presence of alkali, so a new surfactant is provided. A composition of viscoelastic surfactants for oil displacement, the surfactant has the characteristics of high oil displacement efficiency, and is especially suitable for Shaqi Oilfield in Jiangsu Oilfield

Method used

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  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition
  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition
  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Surfactant Preparation

[0032] (1) palmitic acid amide carboxy betaine amphoteric surfactant (R 1 =C 15 , R 2 =C 2 , R 3 =C 3 ) preparation

[0033] a) Add 0.5 mole of long carbon chain hexadecanoic 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 hexadecanoyl tertiary amine product, then add the required amount of β-chloropropionate and react at 70°C for 12 hours, then use absolute ethanol Long carbon chain betaine amphoteric surfactant is obtained after recrystallization and purification; wherein, the molar ratio of methyl palmitate: N,N-dimethylethylenediamine: β-sodium chloropropionate is 1:2:1.6 .

[0034] b) Hydroxyl substituted benzene carboxylate and palmitoamide carboxy betaine amphoteric surfactant prepared by the present invention were d...

Embodiment 2

[0043] 1. Surfactant Preparation

[0044] (1) Erucamide carboxy betaine amphoteric surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 ) preparation

[0045] a) Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 145°C for 7 hours, turn on the vacuum pump, and remove the methanol and Excessive N,N-dimethylpropylenediamine, to obtain erucic acid acyl tertiary amide product, then add the required amount of sodium chloroacetate, react at 75°C for 10 hours, and obtain long carbon chain after recrystallization and purification with absolute ethanol Betaine surfactant; Wherein, methyl erucate: N,N-dimethylpropylenediamine: the mol ratio of sodium chloroacetate is 1:2:1.5.

[0046] b) The hydroxy-substituted benzene carboxylate and the erucamide carboxy betaine amphoteric surfactant prepared by the present invention are respectively dissolved in water, stirred for 30 minutes, and prepared into an a...

Embodiment 3

[0050] 1. Surfactant Preparation

[0051] (1) triacic acid amide carboxy betaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 =C 3 ) preparation

[0052] a) Add 0.5 moles of long-chain triacic acid methyl ester and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 150°C for 8 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylpropylenediamine to obtain triacyl tertiary amine product, then add the required amount of β-chloropropionate sodium, react at 85°C for 16 hours, and dry Obtain the long carbon chain betaine surfactant after ethanol recrystallization purification; Wherein, triacic acid methyl ester:N,N-dimethylpropylenediamine: the molar ratio of β-sodium chloropropionate is 1:2:1.6 .

[0053] b) The hydroxy-substituted benzene carboxylate and the triacic acid amide carboxy betaine amphoteric surfactant prepared by the present invention are respectively dissolved in wa...

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Abstract

The invention relates to viscoelastic surfactant composition for oil displacement as well as an application of the composition as an oil displacing agent and mainly solves the problem that surfactantshave low oil displacement efficiency under the high-temperature medium / low-permeability condition in the prior art. The viscoelastic surfactant composition for oil displacement is prepared from an ampholytic surfactant shown in formula (I) and organic acid salt, wherein the organic acid salt is selected from at least one of organic acid salts shown in formula (II); in the formula (I), R1 is selected from at least one of C8-C29 alkyls and alkenyls, and R2 and R3 are independently selected from at least one of C1-C5 alkylenes or hydroxyl substituted alkylenes; in the formula (II), X is selectedfrom at least one of carboxylate and sulfonate radicals, and Y is selected from at least one of hydrogen, alkyl, hydroxyl and halogen. With the adoption of the technical scheme, the technical problemis better solved, and the composition can be applied to oil displacement production of oil fields.

Description

technical field [0001] The invention relates to the synthesis of a viscoelastic surfactant composition for oil displacement and the application of the composition as an oil displacement agent. Background technique [0002] With the rapid growth of the national economy, the contradiction between domestic oil supply and demand has become increasingly prominent, mainly manifested in relatively poor oil and gas resources, oil exploration and development and proven reserves cannot keep up with the growth of demand, and the degree of crude oil recovery is relatively low. In order to alleviate the shortage of my country's oil resources, reduce the gap in crude oil production, and ensure my country's oil security, one of the important measures to be taken is to greatly increase the recovery rate of my country's crude oil. For example, the current average recovery rate of Sinopec is only 28%, and more than 70% of the oil resources have not been effectively developed and utilized, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/30
Inventor 王辉辉姚峰沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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