Alkali-free viscoelastic surfactant as well as preparation method and application thereof

A surfactant and viscoelastic technology, which is applied in the field of preparation of alkali-free viscoelastic surfactants, can solve problems such as injection difficulties and formation blockage, and achieve the effects of reduced repulsion, high interfacial activity, and excellent temperature resistance

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 polymers in the existing chemical flooding are used in the process of flooding low-permeability reservoirs to easily cause formation plugging and difficult injection problems. A new combination of viscoelastic surfactants is provided. The surfactant has the characteristics of high oil displacement efficiency under the condition of high temperature and low permeability, especially suitable for Shaqi Oilfield of Jiangsu Oilfield

Method used

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  • Alkali-free viscoelastic surfactant as well as preparation method and application thereof
  • Alkali-free viscoelastic surfactant as well as preparation method and application thereof
  • Alkali-free viscoelastic surfactant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Surfactant Preparation

[0033] (1) Erucamide carboxy betaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 , R 4 , R 5 =C 1 ) preparation

[0034] 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.

[0035] b) Hydroxyl-substituted benzene carboxylate and the erucamide carboxy betaine surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and formulated into an aqu...

Embodiment 2

[0044] 1. Surfactant Preparation

[0045] (1) palmitic acid amide carboxy betaine surfactant (R 1 =C 15 , R 2 =C 2 , R 3 =C 3 , R 4 , R 5 =C 1 ) preparation

[0046] 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 After recrystallization and purification, a long carbon chain betaine surfactant is obtained; wherein, the molar ratio of methyl palmitate:N,N-dimethylethylenediamine:sodium β-chloropropionate is 1:2:1.6.

[0047] b) The hydroxy-substituted benzene carboxylate and the palmitic acid amide carboxy betaine surfactant prepared by the present invention are re...

Embodiment 3

[0051] 1. Surfactant Preparation

[0052] (1) triacic acid amide carboxy betaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 =C 3 , R 4 , R 5 =C 1 ) preparation

[0053] 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 .

[0054] b) Hydroxy-substituted benzene carboxylate and the triacic acid amide carboxy betaine surfactant prepared by the present invention were dissolved in water res...

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Abstract

The invention relates to a preparation method and an application of an alkali-free viscoelastic surfactant for a low-permeability reservoir and mainly solves the problem of poor flooding effect of anexisting flooding system under the condition of the high-temperature and low-permeability reservoir. According to the technical schemes, alkali-free viscoelastic surfactant composition suitable for alow permeability oilfield is prepared from a betaine surfactant, an anionic surfactant and water, wherein the betaine surfactant is represented as the formula (I) in the description; the anionic surfactant is selected from at least one of structures shown as the formula (II) in the description; in the formula (I), R1 is selected from any one of C8-C29 alkyl and alkenyl, and R2 and R3 are independently selected from C1-C5 alkylidene and hydroxyl substituted alkylidene; in the structural formula (II), R6 is selected from C1-C4 alkyl, and X is selected from any one of carboxylate radical and sulfonate radical. With the adoption of any one of the technical schemes, the technical problem is solved better, and the alkali-free viscoelastic surfactant can be applied to tertiary oil recovery of theoilfield.

Description

technical field [0001] The invention relates to a preparation method and application of an alkali-free viscoelastic 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. In recent years, with the reduction of recoverable reserves of medium and high permeability reservoirs, people pay more and more attention to the development of low permeability reservoirs. Surfactant flooding has been proved to be a very promising method to enhance the recovery of low permeability oilfields, and has become a research hotspot at home and abroad. Compared with medium and high permeability reservoirs, residual oil droplets in low permeability reservoirs exist in pores with small throat radius. Under the same cond...

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 王辉辉沙鸥何秀娟李斌
Owner CHINA PETROLEUM & CHEM CORP
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